MAX6386XR29D3-T中文资料

NUAL KIT MA ATION U EET L H A S V A E T WS DA FOLLO
___________________________Features
o Input Range: Up to 30V o 1A On-Chip Power Switch o Adjustable Output (MAX830) Fixed Outputs: 5V (MAX831) 3.3V (MAX832) 3V (MAX833) o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8mA Quiescent Current o 16-Pin SO Package o Evaluation Kit Available
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
INPUT 8V TO 30V 100µF VIN VSW
100µH*
OUTPUT 5V AT 1A
V IN 1 V IN 2 V IN 3
16 V SW 15 V SW 14 V SW
_______________________Applications
Distributed Power from High-Voltage Buses High-Current, High-Voltage Step-Down Applications Multiple-Output Buck Converter
MAX831
VC 10k 0.047µF SENSE

___________________________________________________________________Selector Guide________________General DescriptionThe MAX6316–MAX6322 family of microprocessor (µP)supervisory circuits monitors power supplies and microprocessor activity in digital systems. It offers sev-eral combinations of push/pull, open-drain, and bidirec-tional (such as Motorola 68HC11) reset outputs, along with watchdog and manual reset features. The Selector Guide below lists the specific functions available from each device. These devices are specifically designed to ignore fast negative transients on V CC . Resets are guaranteed valid for V CC down to 1V.These devices are available in 26 factory-trimmed reset threshold voltages (from 2.5V to 5V, in 100mV incre-ments), featuring four minimum power-on reset timeout periods (from 1ms to 1.12s), and four watchdog timeout periods (from 6.3ms to 25.6s). Thirteen standard ver-sions are available with an order increment requirement of 2500 pieces (see Standard Versions table); contact the factory for availability of other versions, which have an order increment requirement of 10,000 pieces.The MAX6316–MAX6322 are offered in a miniature 5-pin SOT23 package.________________________ApplicationsPortable Computers Computers ControllersIntelligent InstrumentsPortable/Battery-Powered Equipment Embedded Control Systems____________________________Features♦Small 5-Pin SOT23 Package♦Available in 26 Reset Threshold Voltages2.5V to 5V, in 100mV Increments ♦Four Reset Timeout Periods1ms, 20ms, 140ms, or 1.12s (min)♦Four Watchdog Timeout Periods6.3ms, 102ms, 1.6s, or 25.6s (typ) ♦Four Reset Output StagesActive-High, Push/Pull Active-Low, Push/Pull Active-Low, Open-Drain Active-Low, Bidirectional♦Guaranteed Reset Valid to V CC = 1V♦Immune to Short Negative V CC Transients ♦Low Cost♦No External ComponentsMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset________________________________________________________________Maxim Integrated Products 119-0496; Rev 7; 11/07_______________Ordering InformationOrdering Information continued at end of data sheet.*The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device.Typical Operating Circuit and Pin Configurations appear at end of data sheet.For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .Specify lead-free by replacing “-T” with “+T” when ordering.ELECTRICAL CHARACTERISTICS(V CC = 2.5V to 5.5V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)M A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Voltage (with respect to GND)V CC ......................................................................-0.3V to +6V RESET (MAX6320/MAX6321/MAX6322 only)...... -0.3V to +6V All Other Pins.........................................-0.3V to (V CC + 0.3V)Input/Output Current, All Pins.............................................20mAContinuous Power Dissipation (T A = +70°C)SOT23-5 (derate 7.1mW/°C above +70°C)...............571mW Operating Temperature Range..........................-40°C to +125°C Junction Temperature......................................................+150°C Storage Temperature Range..............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°CTH available in 100mV increments from 2.5V to 5V (see Table 1 at end of data sheet).Note 3:Guaranteed by design.MAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________3Note 5:Measured from RESET V OL to (0.8 x V CC ), R LOAD = ∞.Note 6:WDI is internally serviced within the watchdog period if WDI is left unconnected.Note 7:The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is designed for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capac-itive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.ELECTRICAL CHARACTERISTICS (continued)M A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)021*********-4020-20406080100MAX6316/MAX6317/MAX6318/MAX6320/MAX6321SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )302010504090807060100-40-20020406080100V CC FALLING TO RESET PROPAGATIONDELAY vs. TEMPERATURETEMPERATURE (°C)R E S E T P R O P A G A T I O N D E L A Y (μs )140180160240220200300280260320-40020-20406080100MAX6316/MAX6317/MAX6319/MAX6320/MAX6322MANUAL RESET TO RESETPROPAGATION DELAY vs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )0.950.980.970.961.000.991.041.031.021.011.05-40-2020406080100NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATUREM A X 6316t o c 04TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T P E R I O D0.950.980.970.961.000.991.041.031.021.011.05-40-2020406080100MAX6316/MAX6317/MAX6318/MAX6320/MAX6321NORMALIZED WATCHDOG TIMEOUTPERIOD vs. TEMPERATUREM A X 6316t o c 05TEMPERATURE (°C)N O R M A L I Z E D W A T C H D O G T I M E O U T P E R I O D800101001000MAXIMUM V CC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE2010RESET THRESHOLD OVERDRIVE (mV) V RST - V CCT RA N S I E N T D U R A T I O N (μs )3050604070200ns/divMAX6316M/6318MH/6319MHBIDIRECTIONALPULLUP CHARACTERISTICSMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________5______________________________________________________________Pin DescriptionM A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 6______________________________________________________________________________________________________Detailed DescriptionA microprocessor’s (µP) reset input starts or restarts the µP in a known state. The reset output of the MAX6316–MAX6322 µP supervisory circuits interfaces with the reset input of the µP, preventing code-execution errors during power-up, power-down, and brownout condi-tions (see the Typical Operating Circuit ). The MAX6316/MAX6317/MAX6318/MAX6320/MAX6321 are also capa-ble of asserting a reset should the µP become stuck in an infinite loop.Reset OutputThe MAX6316L/MAX6318LH/MAX6319LH feature an active-low reset output, while the MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP feature an active-high reset output. RESET is guaran-teed to be a logic low and RESET is guaranteed to be a logic high for V CC down to 1V.The MAX6316–MAX6322 assert reset when V CC is below the reset threshold (V RST ), when MR is pulled low (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP only), or if the WDI pin is not serviced withinthe watchdog timeout period (t WD ). Reset remains assert-ed for the specified reset active timeout period (t RP ) after V CC rises above the reset threshold, after MR transitions low to high, or after the watchdog timer asserts the reset (MAX6316_/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP). After the reset active timeout period (t RP )expires, the reset output deasserts, and the watchdog timer restarts from zero (Figure 2).Figure 1. Functional DiagramFigure 2. Reset Timing DiagramMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________7Bidirectional R E S E T OutputThe MAX6316M/MAX6318MH/MAX6319MH are designed to interface with µPs that have bidirectional reset pins,such as the Motorola 68HC11. Like an open-drain output,these devices allow the µP or other devices to pull the bidirectional reset (RESET ) low and assert a reset condi-tion. However, unlike a standard open-drain output, it includes the commonly specified 4.7k Ωpullup resistor with a P-channel active pullup in parallel.This configuration allows the MAX6316M/MAX6318MH/MAX6319MH to solve a problem associated with µPs that have bidirectional reset pins in systems where sev-eral devices connect to RESET (F igure 3). These µPs can often determine if a reset was asserted by an exter-nal device (i.e., the supervisor IC) or by the µP itself (due to a watchdog fault, clock error, or other source),and then jump to a vector appropriate for the source of the reset. However, if the µP does assert reset, it does not retain the information, but must determine the cause after the reset has occurred.The following procedure describes how this is done in the Motorola 68HC11. In all cases of reset, the µP pulls RESET low for about four external-clock cycles. It then releases RESET , waits for two external-clock cycles,then checks RESET ’s state. If RESET is still low, the µP concludes that the source of the reset was external and, when RESET eventually reaches the high state, it jumps to the normal reset vector. In this case, stored-state information is erased and processing begins fromscratch. If, on the other hand, RESET is high after a delay of two external-clock cycles, the processor knows that it caused the reset itself and can jump to a different vector and use stored-state information to determine what caused the reset.A problem occurs with faster µPs; two external-clock cycles are only 500ns at 4MHz. When there are several devices on the reset line, and only a passive pullup resis-tor is used, the input capacitance and stray capacitance can prevent RESET from reaching the logic high state (0.8✕V CC ) in the time allowed. If this happens, all resets will be interpreted as external. The µP output stage is guaran-teed to sink 1.6mA, so the rise time can not be reduced considerably by decreasing the 4.7k Ωinternal pullup resistance. See Bidirectional Pullup Characteristics in the Typical Operating Characteristics .The MAX6316M/MAX6318MH/MAX6319MH overcome this problem with an active pullup FET in parallel with the 4.7k Ωresistor (F igures 4 and 5). The pullup transistor holds RESET high until the µP reset I/O or the supervisory circuit itself forces the line low. Once RESET goes below V PTH , a comparator sets the transition edge flip-flop, indi-cating that the next transition for RESET will be low to high. When RESET is released, the 4.7k Ωresistor pulls RESET up toward V CC . Once RESET rises above V PTH but is below (0.85 x V CC ), the active P-channel pullup turns on. Once RESET rises above (0.85 x V CC ) or the 2µs one-shot times out, the active pullup turns off. The parallel combination of the 4.7k Ωpullup and theFigure 3. MAX6316M/MAX6318MH/MAX6319MH Supports Additional Devices on the Reset BusM A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 8_______________________________________________________________________________________Figure 4. MAX6316/MAX6318MH/MAX6319MH Bidirectional Reset Output Functional DiagramMAX6316–MAX63225-Pin µP Supervisory Circuits withWatchdog and Manual Reset_______________________________________________________________________________________9P-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing RESET to transition from low to high within the required two elec-tronic-clock cycles, even with several devices on the reset line. This process occurs regardless of whether the reset was caused by V CC dipping below the reset threshold, the watchdog timing out, MR being asserted,or the µP or other device asserting RESET . The parts do not require an external pullup. To minimize supply cur-rent consumption, the internal 4.7k Ωpullup resistor dis-connects from the supply whenever the MAX6316M/MAX6318MH/MAX6319MH assert reset.Open-Drain R E S E T OutputThe MAX6320P/MAX6321HP/MAX6322HP have an active-low, open-drain reset output. This output struc-ture will sink current when RESET is asserted. Connect a pullup resistor from RESET to any supply voltage up to 6V (Figure 6). Select a resistor value large enough toregister a logic low (see Electrical Characteristics ), and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10k Ωpullup is sufficient in most applications.Manual-Reset InputThe MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP feature a manual reset input. A logic low on MR asserts a reset. After MR transitions low to high, reset remains asserted for the duration of the reset timeout peri-od (t RP ). The MR input is connected to V CC through an internal 52k Ωpullup resistor and therefore can be left unconnected when not in use. MR can be driven with TTL-logic levels in 5V systems, with CMOS-logic levels in 3V systems, or with open-drain or open-collector output devices. A normally-open momentary switch from MR to ground can also be used; it requires no external debouncing circuitry. MR is designed to reject fast, negative-going transients (typically 100ns pulses). A 0.1µF capacitor from MR to ground provides additional noise immunity.The MR input pin is equipped with internal ESD-protection circuitry that may become forward biased. Should MR be driven by voltages higher than V CC , excessive current would be drawn, which would damage the part. F or example, assume that MR is driven by a +5V supply other than V CC . If V CC drops lower than +4.7V, MR ’s absolute maximum rating is violated [-0.3V to (V CC + 0.3V)], and undesirable current flows through the ESD structure from MR to V CC . To avoid this, use the same supply for MR as the supply monitored by V CC . This guarantees that the voltage at MR will never exceed V CC .Watchdog InputThe MAX6316_/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP feature a watchdog circuit that monitors the µP’s activity. If the µP does not toggle the watchdog input (WDI) within the watchdog timeout period (t WD ),reset asserts. The internal watchdog timer is cleared by reset or by a transition at WDI (which can detect pulses as short as 50ns). The watchdog timer remains cleared while reset is asserted. Once reset is released, the timer begins counting again (Figure 7).The WDI input is designed for a three-stated output device with a 10µA maximum leakage current and the capability of driving a maximum capacitive load of 200pF.The three-state device must be able to source and sink at least 200µA when active. Disable the watchdog function by leaving WDI unconnected or by three-stating the driver connected to WDI. When the watchdog timer is left open circuited, the timer is cleared internally at intervals equal to 7/8 of the watchdog period.Figure 6. MAX6320P/MAX6321HP/MAX6322HP Open-Drain RESET Output Allows Use with Multiple SuppliesFigure 5. Bidirectional RESET Timing DiagramM A X 6316–M A X 63225-Pin µP Supervisory Circuits with Watchdog and Manual Reset 10______________________________________________________________________________________Applications InformationWatchdog Input CurrentThe WDI input is internally driven through a buffer and series resistor from the watchdog counter. For minimum watchdog input current (minimum overall power con-sumption), leave WDI low for the majority of the watch-dog timeout period. When high, WDI can draw as much as 160µA. Pulsing WDI high at a low duty cycle will reduce the effect of the large input current. When WDI is left unconnected, the watchdog timer is serviced within the watchdog timeout period by a low-high-low pulse from the counter chain.Negative-Going V CC TransientsThese supervisors are immune to short-duration, nega-tive-going V CC transients (glitches), which usually do not require the entire system to shut down. Typically,200ns large-amplitude pulses (from ground to V CC ) on the supply will not cause a reset. Lower amplitude puls-es result in greater immunity. Typically, a V CC transient that goes 100mV under the reset threshold and lasts less than 4µs will not trigger a reset. An optional 0.1µF bypass capacitor mounted close to V CC provides addi-tional transient immunity.Ensuring Valid Reset OutputsDown to V CC = 0The MAX6316_/MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP are guaranteed to operate properly down to V CC = 1V. In applications that require valid reset levels down to V CC = 0, a pulldown resistor to active-low outputs (push/pull and bidirectional only,F igure 8) and a pullup resistor to active-high outputs(push/pull only, Figure 9) will ensure that the reset line is valid while the reset output can no longer sink orsource current. This scheme does not work with the open-drain outputs of the MAX6320/MAX6321/MAX6322.The resistor value used is not critical, but it must be large enough not to load the reset output when V CC is above the reset threshold. F or most applications,100k Ωis adequate.Watchdog Software Considerations(MAX6316/MAX6317/MAX6318/MAX6320/MAX6321)One way to help the watchdog timer monitor software execution more closely is to set and reset the watchdog input at different points in the program, rather than pulsing the watchdog input high-low-high or low-high-low. This technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watchdog from timing out.Figure 7. Watchdog Timing RelationshipFigure 9. Ensuring RESET Valid to V CC = 0 on Active-High Push/Pull OutputsFigure 8. Ensuring RESET Valid to V CC = 0 on Active-Low Push/Pull and Bidirectional OutputsMAX6316–MAX6322Watchdog and Manual Reset______________________________________________________________________________________11F igure 10 shows an example of a flow diagram where the I/O driving the watchdog input is set high at the beginning of the program, set low at the end of every subroutine or loop, then set high again when the pro-gram returns to the beginning. If the program should hang in any subroutine, the problem would be quickly corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, causing a reset or interrupt to be issued. As described in the Watchdog Input Current section, this scheme results in higher time average WDI current than does leaving WDI low for the majority of the timeout period and periodically pulsing it low-high-low.Figure 10. Watchdog Flow Diagram__________________Pin ConfigurationsTypical Operating CircuitTable 2. Standard VersionsTable 1. Factory-Trimmed Reset ThresholdsM A X 6316–M A X 6322Watchdog and Manual ResetTable 3. Reset/Watchdog Timeout PeriodsMAX6316–MAX6322Watchdog and Manual Reset______________________________________________________________________________________13__Ordering Information (continued)a watchdog feature (see Selector Guide) are factory-trimmed to one of four watchdog timeout periods. Insert the letter corre-sponding to the desired watchdog timeout period (W, X, Y, or Z from Table 3) into the blank following the reset timeout suffix.TRANSISTOR COUNT: 191SUBSTRATE IS INTERNALLY CONNECTED TO V+Chip Informationdard versions only. The required order increment for nonstandard versions is 10,000 pieces. Contact factory for availability.M A X 6316–M A X 6322Watchdog and Manual Reset 14______________________________________________________________________________________Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)M axim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a M axim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________15©2007 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.MAX6316–MAX6322 Watchdog and Manual ResetRevision History。

General DescriptionThe MAX6161–MAX6168 are precision, low-dropout,micropower voltage references. These three-terminal devices operate with an input voltage range from (V OUT + 200mV) to 12.6V and are available with output volt-age options of 1.25V, 1.8V, 2.048V, 2.5V, 3V, 4.096V,4.5V, and 5V. They feature a proprietary curvature-cor-rection circuit and laser-trimmed thin-film resistors that result in a very low temperature coefficient of 5ppm/°C (max) and an initial accuracy of ±2mV (max).Specifications apply to the extended temperature range (-40°C to +85°C).The MAX6161–MAX6168 typically draw only 100µA of supply current and can source 5mA (4mA for MAX6161) or sink 2mA of load current. Unlike conven-tional shunt-mode (two-terminal) references that waste supply current and require an external resistor, these devices offer a supply current that is virtually indepen-dent of the supply voltage (8µA/V variation) and do not require an external resistor. Additionally, the internally compensated devices do not require an external com-pensation capacitor. Eliminating the external compen-sation capacitor saves valuable board area in space-critical applications. A low-dropout voltage and a supply-independent, ultra-low supply current make these devices ideal for battery-operated, high-perfor-mance, low-voltage systems.The MAX6161–MAX6168 are available in 8-pin SO packages.________________________ApplicationsAnalog-to-Digital Converters (ADCs)Portable Battery-Powered Systems Notebook Computers PDAs, GPS, DMMs Cellular PhonesPrecision +3V/+5V Systems____________________________Features♦±2mV (max) Initial Accuracy♦5ppm/°C (max) Temperature Coefficient ♦5mA Source Current at 0.9mV/mA ♦2mA Sink Current at 2.5mV/mA ♦Stable with 1µF Capacitive Loads ♦No External Capacitor Required ♦100µA (typ) Quiescent Supply Current ♦200mV (max) Dropout at 1mA Load Current ♦Output Voltage Options: 1.25V, 1.8V, 2.048V, 2.5V,3V, 4.096V, 4.5V, 5V19-1650; Rev 3; 8/05MAX6161–MAX6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References________________________________________________________________Maxim Integrated Products 1___________________Pin Configuration*Insert the code for the desired initial accuracy and temperature coefficient (from the Selector Guide) in the blank to complete the part number.Typical Operating Circuit and Selector Guide appear at end of data sheet.Ordering InformationFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 6161–M A X 6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Voltages Referenced to GNDIN …………............................................................-0.3 to +13.5V OUT………………........................................-0.3V to (V IN + 0.3V)Output Short-Circuit Duration to GND or IN (V IN ≤6V)...Continuous Output Short-Circuit Duration to GND or IN (V IN > 6V)…...........60sContinuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range………….…………-65°C to +150°C Lead Temperature (soldering, 10s)……………………….+300°CELECTRICAL CHARACTERISTICS—MAX6161 (V OUT = 1.25V)MAX6161–MAX6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS—MAX6168 (V OUT = 1.800V)M A X 6161–M A X 6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—MAX6162 (V OUT = 2.048V)MAX6161–MAX6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References_______________________________________________________________________________________5ELECTRICAL CHARACTERISTICS—MAX6166 (V OUT = 2.500V)M A X 6161–M A X 6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References 6_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS —MAX6163 (V OUT = 3.000V)MAX6161–MAX6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References_______________________________________________________________________________________7ELECTRICAL CHARACTERISTICS—MAX6164 (V OUT = 4.096V)M A X 6161–M A X 6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References 8_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS —MAX6167 (V OUT = 4.500V)MAX6161–MAX6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References_______________________________________________________________________________________9ELECTRICAL CHARACTERISTICS—MAX6165 (V OUT = 5.000V)Note 2:Temperature Coefficient is specified by the “box” method; i.e., the maximum ΔV OUT is divided by the maximum ΔT.Note 3:Thermal Hysteresis is defined as the change in T A = +25°C output voltage before and after temperature cycling of thedevice (from T A = T MIN to T MAX ). Initial measurement at T A = +25°C is followed by temperature cycling the device to T A = +85°C then to T A = -40°C, and another measurement at T A = +25°C is compared to the original measurement at T A = +25°C.Note 4:Dropout voltage is the minimum input voltage at which V OUT changes ≤0.2% from V OUT at V IN = 5.0V (V IN = 5.5V forMAX6165).M A X 6161–M A X 6168Precision, Micropower, Low-Dropout, High-Output-Current, SO-8 Voltage References 10______________________________________________________________________________________Typical Operating Characteristics(V IN = +5V for MAX6161–MAX6168, V IN = +5.5V for MAX6165, I OUT = 0, T A = +25°C, unless otherwise noted.) (Note 5)MAX6161OUTPUT VOLTAGE TEMPERATURE DRIFTTEMPERATURE (°C)O U T P U T V O L T A G E (V )70552540-1010-251.24961.24971.24981.24991.25001.25011.25021.25031.25041.25051.2495-4085MAX6165OUTPUT VOLTAGE TEMPERATURE DRIFTTEMPERATURE (°C)O U T P U T V O L T A G E (V )7055-25-102510404.99854.99904.99955.00005.00055.00105.00155.00204.9980-4085MAX6161LONG-TERM DRIFTM A X 6161/68 t o c 03TIME (hrs)D R I F T (p p m )768192384576-30-20-100102030405060-40960MAX6165LONG-TERM DRIFTM A X 6161/68 t o c 04TIME (hrs)D R I F T (p p m )768192384576-90-80-70-60-50-40-30-20-100-100960-300-200-100010020030024681012MAX6161LINE REGULATIONINPUT VOLTAGE (V)O U T P U T V O L T A G E C H A N G E (μV )-1200-600-800-1000-400-20002005971113MAX6165LINE REGULATIONINPUT VOLTAGE (V)O U T P U T V O L T A G E C H A N G E (μV )-310-1-22345-4-224LOAD CURRENT (mA)O U T P U T V O L T A G E C H A N G E (m V)MAX6161LOAD REGULATION-620-2-44861012-6-2-4246LOAD CURRENT (mA)O U T P U T V O L T A G E C H A N G E (m V )MAX6165LOAD REGULATION0.100.050.200.150.250.30021345MAX6166DROPOUT VOLTAGE vs. LOAD CURRENTLOAD CURRENT (mA)D R O P O U T V O L T A GE (V )MAX6161–MAX6168Output-Current, SO-8 Voltage References______________________________________________________________________________________11Typical Operating Characteristics (continued)(V IN = +5V for MAX6161–MAX6168, V IN = +5.5V for MAX6165, I OUT = 0, T A = +25°C, unless otherwise noted.) (Note 5)00.050.150.100.200.2521345LOAD CURRENT (mA)D R O P O U T V O L T A GE (V )MAX6165DROPOUT VOLTAGE vs. LOAD CURRENTM A X 6161/68 t o c 11FREQUENCY (kHz)P S R R (d B )0-10-20-30-40-50-60-70-80-900.0011101000.010.11000MAX6161POWER-SUPPLY REJECTION RATIOvs. FREQUENCY-70-800.001101000-60-50-40-30-20-100FREQUENCY (kHz)P S R R (d B )0.1MAX6165POWER-SUPPLY REJECTION RATIOvs. FREQUENCYM A X 6161/68 t c 12MAX6161SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (μA )1210864108116124132140148156164172180100214MAX6165SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (μA )1312101178969610210811412012613213814415090514MAX6161SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )603510-15108116124132140148156164172180100-4085MAX6165SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )603510-159610210811412012613213814415090-408500.00110100040206080100140120160180200220M A X 6161/68 t o c 17FREQUENCY (kHz)O U T P U T I M P E D A N C E (Ω)0.1MAX6161OUTPUT IMPEDANCE vs. FREQUENCY1800.00110100040206010080120140160M A X 6161/68 t o c 18FREQUENCY (kHz)O U T P U T I M P E D A N C E (Ω)0.1MAX6165OUTPUT IMPEDANCE vs. FREQUENCYM A X 6161–M A X 6168Output-Current, SO-8 Voltage References 12______________________________________________________________________________________Typical Operating Characteristics (continued)(V IN = +5V for MAX6161–MAX6168, V IN = +5.5V for MAX6165, I OUT = 0, T A = +25°C, unless otherwise noted.) (Note 5)V OUT 10μV/div 1s/div MAX61610.1Hz TO 10Hz OUTPUT NOISEM A X 6161/68 t o c 19V OUT 10μV/div1s/divMAX6165NOISEM A X 6161/68 t o c 20V OUT 500mV/divV IN 5V/div10μs/divMAX6161TURN-ON TRANSIENT(C L = 50pF)M A X 6161/68 t o c 21V OUT 2V/divV IN 5V/div40μs/divMAX6165TURN-ON TRANSIENT(C L = 50pF)M A X 6161/67 t o c 22I OUT 500μA/divV OUTAC-COUPLED 100mV/div400μs/div MAX6161LOAD TRANSIENT(I OUT = ±250μA, V IN = 5.0, C L = 0)+250μA -250μAMAX6161/68 toc23I OUT 500μA/divV OUTAC-COUPLED50mV/div400μs/divMAX6165LOAD TRANSIENT(I OUT = ±250μA, C L = 0, V IN = 5.5V)+250μA -250μAMAX6161/68 toc24MAX6161–MAX6168Output-Current, SO-8 Voltage References______________________________________________________________________________________13I OUT 5mA/divV OUTAC-COUPLED50mV/div400μs/divMAX6165LOAD TRANSIENT(C L = 0, I OUT = ±2mA, V IN = 5.5V)+2mA -2mAMAX6161/68 toc28I OUT 5mA/divV OUTAC-COUPLED 100mV/div 400μs/div MAX6161LOAD TRANSIENT(V IN = 5.0V, C L = 0, I OUT = ±2mA)+2mA-2mAMAX6161/68 toc27I OUT 5mA/divV OUTAC-COUPLED50mV/div400μs/divMAX6161LOAD TRANSIENT(V IN = 5.0V, C L = 1μF, I OUT = ±2mA)+2mA-2mAMAX6161/68 toc29I OUT 5mA/divV OUTAC-COUPLED20mV/div400μs/divMAX6165LOAD TRANSIENT(C L = 1μF, I OUT = ±2mA, V IN = 5.5V)+2mA-2mAMAX6161/68 toc30I OUT 500μA/divV OUTAC-COUPLED10mV/div 400μs/div MAX6161LOAD TRANSIENT(I OUT = ±250μA, V IN = 5.0V, C L = 1μF)+250μA -250μAMAX6161/68 toc25I OUT 500μA/divV OUTAC-COUPLED20mV/div400μs/divMAX6165LOAD TRANSIENT(I OUT = ±250μA, C L = 1μF, V IN = 5.5V)+250μA-250μAMAX6161/68 toc26Typical Operating Characteristics (continued)(V IN = +5V for MAX6161–MAX6168, V IN = +5.5V for MAX6165, I OUT = 0, T A = +25°C, unless otherwise noted.) (Note 5)M A X 6161–M A X 6168Output-Current, SO-8 Voltage References 14______________________________________________________________________________________I OUT 5mA/divV OUTAC-COUPLED50mV/div 400μs/div MAX6161LOAD TRANSIENT(V IN = 5.0V, C L = 1μF, I OUT = ±4mA)+4mA-4mAMAX6161/68 toc33I OUT 5mA/divV OUTAC-COUPLED50mV/div400μs/divMAX6165LOAD TRANSIENT(I OUT = ±5mA, C L = 1μF, V IN = 5.5V)+5mA-5mAMAX6161/68 toc34V IN500mV/divV OUTAC-COUPLED20mV/div 40μs/div MAX6161LINE TRANSIENT(C L = 0)+0.25V-0.25VMAX6161/68 toc35V IN500mV/divV OUTAC-COUPLED20mV/div40μs/divMAX6165LINE TRANSIENT(C L = 0)+0.25V -0.25VMAX6161/68 toc36Note 5:Many of the Typical Operating Characteristics of the MAX6161 family are extremely similar. The extremes of these characteristicsare found in the MAX6161 (1.25V output) and the MAX6165 (5.0V output). The Typical Operating Characteristics of the remain-der of the MAX6161 family typically lie between these two extremes and can be estimated based on their output voltages.Typical Operating Characteristics (continued)(V IN = +5V for MAX6161–MAX6168, V IN = +5.5V for MAX6165, I OUT = 0, T A = +25°C, unless otherwise noted.) (Note 5)I OUT 5mA/divV OUTAC-COUPLED 200mV/div400μs/div MAX6161LOAD TRANSIENT(V IN = 5.0V, C L = 0, I OUT = ±4mA)+4mA-4mAMAX6161/68 toc31I OUT 5mA/divV OUTAC-COUPLED 100mV/div400μs/divMAX6165LOAD TRANSIENT(I OUT = ±5mA, C L = 0, V IN = 5.5V)+5mA-5mAMAX6161/68 toc32MAX6161–MAX6168Output-Current, SO-8 Voltage References______________________________________________________________________________________15Applications InformationInput BypassingF or the best line-transient performance, decouple the input with a 0.1µF ceramic capacitor as shown in the Typical Operating Circuit . Locate the capacitor as close to IN as possible. When transient performance is less important, no capacitor is necessary.Output/Load CapacitanceDevices in the MAX6161 family do not require an output capacitor for frequency stability. In applications where the load or the supply can experience step changes,an output capacitor of at least 0.1µF will reduce the amount of overshoot (undershoot) and improve the cir-cuit’s transient response. Many applications do not require an external capacitor, and the MAX6161 family can offer a significant advantage in applications when board space is critical.Supply CurrentThe quiescent supply current of the series-mode MAX6161 family is typically 100µA and is virtually inde-pendent of the supply voltage, with only an 8µA/V (max) variation with supply voltage. Unlike series refer-ences, shunt-mode references operate with a series resistor connected to the power supply. The quiescent current of a shunt-mode reference is thus a function of the input voltage. Additionally, shunt-mode references have to be biased at the maximum expected load cur-rent, even if the load current is not present at the time.In the MAX6161 family, the load current is drawn from the input voltage only when required, so supply current is not wasted and efficiency is maximized at all input voltages. This improved efficiency reduces power dissi-pation and extends battery life.When the supply voltage is below the minimum speci-fied input voltage (as during turn-on), the devices can draw up to 400µA beyond the nominal supply current.The input voltage source must be capable of providing this current to ensure reliable turn-on.Output Voltage HysteresisOutput voltage hysteresis is the change in the input voltage at T A = +25°C before and after the device is cycled over its entire operating temperature range.Hysteresis is caused by differential package stress appearing across the bandgap core transistors. The typical temperature hysteresis value is 125ppm.Turn-On TimeThese devices typically turn on and settle to within 0.1% of their final value in 50µs to 300µs, depending on the output voltage (see electrical table of part used).The turn-on time can increase up to 1.5ms with the device operating at the minimum dropout voltage and the maximum load.Typical Operating Circuit__________________________Chip Information TRANSISTOR COUNT: 117PROCESS: BiCMOSPin DescriptionPIN NAME FUNCTIONNo Connection. Not internally connected.N.C.1, 3, 5, 7, 82IN Input Voltage GroundGND 46OUTReference OutputM A X 6161–M A X 6168Output-Current, SO-8 Voltage References 16______________________________________________________________________________________Selector GuideMAX6161–MAX6168Maxim cannot assume responsibility f or use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600_____________________17©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products, Inc.S O I C N .E P SOutput-Current, SO-8 Voltage ReferencesPackage Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)。

The MAX6329/MAX6349 are low-dropout, micropower linear voltage regulators with integrated microprocessor reset circuits. Each is available with preset +3.3V, +2.5V, +1.8V, or adjustable output voltages and can deliver up to 150mA load current. Employing internal Pchannel MOSFET pass transistors, the devices consume only 25µA supply current, independent of the device load. The low supply current, low dropout voltage, and integrated reset functionality make these devices ideal for battery powered portable equipment.
________________________Applications
Hand-Held Instruments
Electronic Planners
Palm Top Computers
PCMCIA Cards
USB Devices
Cellular Telephones
Cordless Telephones
The MAX6329/MAX6349 are optimized for use with a 1µF (min) output capacitor. The regulator output voltage is adjustable with an external resistor-divider network at SET (reset threshold voltages track the desired output voltage). Each device includes thermal shutdown protection, output short-circuit protection, and reverse leakage protection. The MAX6329 includes a shutdown feature to reduce regulator current below 1µA (max) and the MAX6349 offers a manual reset input to assert a microprocessor reset while the regulator output is within specification.