MAXIM MAX4836 MAX4837是低压差(LDO)线性稳压器 说明书
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________________________________概述MAX4836/MAX4837是低压差(LDO)线性稳压器，具有精确的限流开关，以及集成的FLAG或RESET功能。这些器件工作于2.5V至5.5V电源，在预置输出电压下可以提供高达500mA的负载电流。预置输出电压为1.8V/2.5V/2.8V/3.0V/3.3V。MAX4836/MAX4837提供可编程的软启动控制功能，可以消除启动过程中的错误复位。MAX4836在负载电流超过限制时向系统发出FLAG信号。MAX4837在输出电压下降到低于门限值时向系统发出RESET信号。另外，反向电流保护电路可以防止电流从输出流进输入。其它特性还包括90µA低静态电流和0.1µA关断电流。MAX4836/MAX4837提供节省空间的6引脚SOT23与TDFN封装。每款器件都工作在-40°C至+85°C扩展级温度范围。如需1.5V至3.3V范围内、增量为100mV的其它可编程输出电压，请与厂商联系。如需与该器件引脚兼容的100mA产品，请参考MAX4832/MAX4833。与该器件引脚兼容的250mA产品，请参考MAX4834/MAX4835。
________________________________应用SDIO 端口与设备笔记本电脑USB 端口与设备蜂窝电话PDA 与掌上电脑设备GPS系统________________________________特性♦确保最小500mA负载电流♦精确的电流限制♦预置输出电压:1.8V/2.5V/2.8V/3.0V/3.3V♦2.5V至5.5V电源电压范围♦可调节软启动♦低压差♦热关断♦反向电流保护♦关断输出放电电路(MAX4837)♦90µA的低电源电流♦0.1µA的超低关断电流♦FLAG和闭锁(MAX4836)或RESET(MAX4837)♦细小的SOT23与TDFN (3mm x 3mm)封装
MAX4836/MAX4837500mA LDO线性稳压器，带有限流开关
____________________________定购信息19-3374; Rev 0; 7/04
注：尾标“xy”表示器件的输出电压，本文最后部分的表1给出了“xy”的具体数值。尾标“_”表示带有RESET功能或FLAG功能。在“_”位置填入“B”表示RESET功能，填入“C”表示FLAG功能。尾标“dd”表示复位超时周期。表2列出了“dd”的数值。例如，MAX4837EUT18BD2的输出电压为1.8V，具有RESET功能，复位超时周期为30ms。注意：“dd”仅用于具有RESET功能的器件，对于带有FLAG功能的器件没有意义。对于带有FLAG功能的器件，dd项空缺。标准版本的器件需要最少2.5k的定货量。非标准版本的单位定货量为10k。供货情况请与厂商联系。*未来产品－－供货情况请联系厂商。PARTTEMP RANGEPIN-PACKAGEMAX4836EUTxy_-T*-40°C to +85°C6 SOT23-6MAX4836ETTxy_-T-40°C to +85°C6 TDFN-6MAX4837EUTxy_dd-T*-40°C to +85°C6 SOT23-6MAX4837ETTxy_dd-T-40°C to +85°C6 TDFN-6
6OUT
5SS
4RESET(FLAG)1
2GND3
SHDNMAX4836/MAX4837IN
TDFNEXPOSED PADDLETOP VIEW
( ) MAX4836ETTxyC ONLY.____________________________引脚配置
引脚配置(续)见数据资料的最后部分。表1、表2以及选择指南在数据资料的最后部分给出。
________________________________________________________________Maxim Integrated Products1本文是Maxim正式英文资料的译文，Maxim不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或翻译错误，如需确认任何词语的准确性，请参考Maxim提供的英文版资料。索取免费样品和最新版的数据资料，请访问Maxim的主页：www.maxim-ic.com.cn。MAX4836/MAX4837500mA LDO线性稳压器，带有限流开关
2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.IN, SHDN, FLAG, OUT to GND................................-0.3V to +6VRESETto GND .........................................-0.3V to (VOUT+ 0.3V)SS to GND...................................................-0.3V to (VIN+ 0.3V)IN to OUT...............................................................................±6VOUT Short Circuit to GND..........................................ContinuousAll Pins ESD Handling (Human Body Model).........................2kVContinuous Power Dissipation (TA= +70°C)6-Pin SOT23 (derate 9.1mW/°C above +70°C)................727mW6-Pin TDFN (derate 24.4mW/°C above +70°C)..........1951.2mWOperating Temperature Range...........................-40°C to +85°COperating Junction Temperature Range...........-40°C to +125°CStorage Temperature Range.............................-65°C to +150°CLead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating VoltageVIN2.55.5VInput Undervoltage LockoutThresholdVUVLOVIN rising2.002.25V
Input Undervoltage LockoutThreshold Hysteresis50mVSHDN = IN, IOUT = 090150SHDN = IN, IOUT = 0,VUVLO < VIN < VOUT (nominal)150Quiescent CurrentIQSHDN = GND, IOUT = 00.12µA
TA = +25°C200300Dropout Voltage (Note 2)IOUT = 500mATA = -40°C to +85°C330mV
IOUT = 1mA to 500mA, TA = +25°C-1.3+1.3Output Voltage AccuracyIOUT = 1mA to 500mA, TA = -40°C to +85°C-2+2%VNOMOutput CurrentIOUT500mAOutput Current LimitVOUT = 0V540660mAReverse Current at VINVOUT = 5.5V, VIN = 0V to VOUT0.12µACSS = not connected0.512.0CSS = 0.01µF41015Soft-Start Time (Note 3)tSSCSS = 0.1µF40100150ms
TA = +25°C-0.04+0.02+0.065Line Regulation (Note 4)VOUT + 0.5V < VIN <5.5V, ILOAD = 100µATA = -40°C to +85°C-0.05+0.03+0.08%VNOM/VLoad Regulation100µA < ILOAD < 500mA, VIN = VOUT + 1V1.3%VNOMOutput Noise10Hz to 100kHz, CSS = 0.01µF70µVRMSSHUTDOWN INPUT (SHDN)OUT Discharge Resistance inShutdown (MAX4837)SHDN = GND900ΩSHDN Input-Voltage HighVIH1.4VSHDN Input-Voltage LowVIL0.5VSHDN Input Hysteresis30mVSHDN Input Leakage CurrentSHDN = IN or GND-100+100nAMAX4836/MAX4837500mA LDO线性稳压器，带有限流开关
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Note 1:Parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation over thespecified temperature range.Note 2:The dropout voltage is measured from VINto VOUTwhen VOUTis 2% below its nominal value. The nominal output voltage ismeasured from VOUTto GND when VINis 1V greater than VOUT. Defined only for VOUT≥2.5V.Note 3:Soft-start time is defined as the time required for the output to rise from 10% of its nominal value to 90% of its nominal value.Note 4:For VOUT< 2V, VINmust be above 2.5V.Note 5:This is the maximum time OUT can be out of tolerance before a reset is issued. It is implemented to ensure that momentaryoutput glitches do not trigger a reset condition.Note 6:In startup mode, the blanking time counter is not started until the soft-start time has elapsed. The total time from startup toFLAGissued is tSS+ tBLANK.ELECTRICAL CHARACTERISTICS (continued)(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSRESET OUTPUT (MAX4837)RESET ThresholdVRESET0.85 xVOUT0.875 xVOUT0.90 xVOUTV
