FEATURES
DESCRIPTION
APPLICATIONS
bq24072,bq24073
bq24074,bq24075,bq24079
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1.5A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC
?
Fully Compliant USB Charger
–Selectable 100mA and 500mA Maximum The bq2407x series of devices are integrated Li-ion linear chargers and system power path management Input Current
devices targeted at space-limited portable –100mA Maximum Current Limit Ensures applications.The devices operate from either a USB Compliance to USB-IF Standard
port or AC adapter and support charge currents up to –Input based Dynamic Power Management 1.5A.The input voltage range with input overvoltage (V IN -DPM)for Protection Against Poor USB protection supports unregulated adapters.The USB Sources
input current limit accuracy and start up sequence allow the bq2407x to meet USB-IF inrush current ?28V Input Rating with Overvoltage Protection specification.Additionally,the input dynamic power ?
Integrated Dynamic Power Path Management management (V IN -DPM)prevents the charger from (DPPM)Function Simultaneously and crashing incorrectly configured USB sources.Independently Powers the System and The bq2407x features dynamic power path Charges the Battery
management (DPPM)that powers the system while ?Supports up to 1.5A Charge Current with simultaneously and independently charging the Current Monitoring Output (ISET)
battery.The DPPM circuit reduces the charge current when the input current limit causes the system output ?Programmable Input Current Limit up to 1.5A to fall to the DPPM threshold;thus,supplying the for Wall Adapters
system load at all times while monitoring the charge ?System Output Tracks Battery Voltage current separately.This feature reduces the number (bq24072)
of charge and discharge cycles on the battery,allows ?Programmable Termination Current (bq24074)for proper charge termination and enables the system to run with a defective or absent battery pack.
?Battery Disconnect Function with SYSOFF Input (bq24075,bq24079)
Typical Application Circuit
?Programmable Pre-Charge and Fast-Charge Safety Timers
?Reverse Current,Short-Circuit and Thermal Protection
?NTC Thermistor Input
?Proprietary Start Up Sequence Limits Inrush Current
?Status Indication –Charging/Done,Power Good
?
Small 3mm ×3mm 16Lead QFN Package
?Smart Phones
?Portable Media Players
?Portable Navigation Devices ?Low-Power Handheld Devices
Please be aware that an important notice concerning availability,standard warranty,and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.Copyright ?2008–2009,Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
bq24072,bq24073
bq24074,bq24075,bq24079
SLUS810D–SEPTEMBER2008–REVISED https://www.doczj.com/doc/0f11099733.html,
These devices have limited built-in ESD protection.The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
Additionally,the regulated system input enables instant system turn-on when plugged in even with a totally discharged battery.The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents,enabling the use of a smaller adapter.
The battery is charged in three phases:conditioning,constant current,and constant voltage.In all charge phases,an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded.The charger power stage and charge current sense functions are fully integrated.The charger function has high accuracy current and voltage regulation loops,charge status display,and charge termination.The input current limit and charge current are programmable using external resistors.
ORDERING INFORMATION
PART NUMBER OPTIONAL
V OVP V BAT(REG)V OUT(REG)V DPPM MARKING
(1)(2)FUNCTION
bq24072RGTR 6.6V 4.2V V BAT+225mV V O(REG)–100mV TD CKP bq24072RGTT 6.6V 4.2V V BAT+225mV V O(REG)–100mV TD CKP bq24073RGTR 6.6V 4.2V 4.4V V O(REG)–100mV TD CKQ bq24073RGTT 6.6V 4.2V 4.4V V O(REG)–100mV TD CKQ bq24074RGTR10.5V 4.2V 4.4V V O(REG)–100mV ITERM BZF bq24074RGTT10.5V 4.2V 4.4V V O(REG)–100mV ITERM BZF bq24075RGTR 6.6V 4.2V 5.5V 4.3V SYSOFF CDU bq24075RGTT 6.6V 4.2V 5.5V 4.3V SYSOFF CDU bq24079RGTR 6.6V 4.1V 5.5V 4.3V SYSOFF ODI bq24079RGTT 6.6V 4.1V 5.5V 4.3V SYSOFF ODI
(1)The RGT package is available in the following options:
R-taped and reeled in quantities of3,000devices per reel.
T-taped and reeled in quantities of250devices per reel.
(2)This product is RoHS compatible,including a lead concentration that does not exceed0.1%of total product weight,and is suitable for
use in specified lead-free soldering processes.In addition,this product uses package materials that do not contain halogens,including bromine(Br)or antimony(Sb)above0.1%of total product weight.
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ABSOLUTE MAXIMUM RATINGS(1)
DISSIPATION RATINGS
RECOMMENDED OPERATING CONDITIONS
bq24072,bq24073 bq24074,bq24075,bq24079
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over the0°C to125°C operating free-air temperature range(unless otherwise noted)
VALUE UNIT
IN(with respect to VSS)–0.3to28V
BAT(with respect to VSS)–0.3to5V
V I Input Voltage
OUT,EN1,EN2,CE,TS,ISET,PGOOD,CHG,ILIM,TMR,ITERM,
–0.3to7V
SYSOFF,TD(with respect to VSS)
I I Input Current IN 1.6A
OUT5A Output Current
I O BAT(Discharge mode)5A
(Continuous)
BAT(Charging mode) 1.5(2)A Output Sink Current CHG,PGOOD15mA
T J Junction temperature–40to150°C
T stg Storage temperature–65to150°C (1)Stresses 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 under recommended operating conditions is not implied.Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.All voltage values are with respect to the network ground terminal unless otherwise noted.
(2)The IC operational charging life is reduced to20,000hours,when charging at1.5A and125°C.The thermal regulation feature reduces
charge current if the IC’s junction temperature reaches125°C;thus without a good thermal design the maximum programmed charge current may not be reached.
POWER RATING PACKAGE(1)RθJA RθJC
T A≤25°C T A=85°C RGT(2)39.47°C/W 2.4°C/W 2.3W225mW
(1)For the most current package and ordering information,see the Package Option Addendum at the end of this document,or see the TI
website at https://www.doczj.com/doc/0f11099733.html,.
(2)This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board.The pad is
connected to the ground plane by a2x3via matrix.
MIN MAX UNIT IN voltage range 4.3526V
V I’72,’73,‘75,'79 4.35 6.4 IN operating voltage range V
‘74 4.3510.2
I IN Input current,IN pin 1.5A
I OUT Current,OUT pin 4.5A
I BAT Current,BAT pin(Discharging) 4.5A
I CHG Current,BAT pin(Charging) 1.5(1)A
T J Junction Temperature–40125°C
R ILIM Maximum input current programming resistor11008000?
R ISET Fast-charge current programming resistor(2)5903000?
R ITERM Termination current programming resistor015k?
R TMR Timer programming resistor1872k?(1)The IC operational charging life is reduced to20,000hours,when charging at1.5A and125°C.The thermal regulation feature reduces
charge current if the IC’s junction temperature reaches125°C;thus without a good thermal design the maximum programmed charge current may not be reached.
(2)Use a1%tolerance resistor for R ISET to avoid issues with the R ISET short test when using the maximum charge current setting. Copyright?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback3
ELECTRICAL CHARACTERISTICS
bq24072,bq24073
bq24074,bq24075,bq24079
SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html,
Over junction temperature range (0°≤T J ≤125°C)and the recommended supply voltage range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT UVLO Undervoltage lock-out V IN :0V →4V 3.2 3.3
3.4V V hys Hysteresis on UVLO
V IN :4V →0V
200300mV Input power detected when V IN >V BAT +V IN(DT)V IN(DT)Input power detection threshold 5580130
mV V BAT =3.6V,VIN:3.5V →4V V hys
Hysteresis on V IN(DT)
V BAT =3.6V,V IN :4V →3.5V
20
mV Time measured from V IN :0V →5V 1μs t DGL(PGOOD)Deglitch time,input power detected status 1.2ms rise-time to PGOOD =LO V IN :5V →7V (’72,’73,’75,'79) 6.4 6.6 6.8V OVP Input overvoltage protection threshold V V IN :5V →11V (’74)
10.210.510.8
V hys
Hysteresis on OVP
V IN :7V →5V (’72,’73,’75,'79)110mV
V IN :11V →5V
(’74)
175t DGL(OVP)Input overvoltage blanking time (OVP fault deglitch)50μs Time measured from V IN :11V →5V with 1μs t REC
Input overvoltage recovery time
1.2
ms
fall-time to PGOOD =LO
ILIM,ISET SHORT CIRCUIT DETECTION (CHECKED DURING STARTUP)I SC Current source
V IN >UVLO and V IN >V BAT +V IN(DT) 1.3mA V SC
V IN >UVLO and V IN >V BAT +V IN(DT)
520
mV
QUIESCENT CURRENT CE =LO or HI,input power not detected,I BAT(PDWN)Sleep current into BAT pin 6.5μA No load on OUT pin,T J =85°C EN1=HI,EN2=HI,V IN =6V,T J =85°C 50μA
I IN Standby current into IN pin EN1=HI,EN2=HI,V IN =10V,T J =85°C 200CE =LO,V IN =6V,no load on OUT pin,I CC
Active supply current,IN pin
1.5
mA V BAT >V BAT(REG),(EN1,EN2)≠(HI,HI)
POWER PATH V DO(IN-OUT)V IN –V OUT V IN =4.3V,I IN =1A,V BAT =4.2V 300475mV V DO(BAT-OUT)
V BAT –V OUT
I OUT =1A,V IN =0V,V BAT >3V 50100mV
V IN >V OUT +V DO(IN-OUT),V BAT <3.2V 3.3 3.4 3.5OUT pin voltage regulation (bq24072)
V BAT +V BAT +V BAT +V IN >V OUT +V DO(IN-OUT),V BAT ≥3.2V 150mV
225mV
270mV
V O(REG)
V OUT pin voltage regulation (bq24073,bq24074)V IN >V OUT +V DO(IN-OUT) 4.3 4.4 4.5OUT pin voltage regulation (bq24075,bq24079)
V IN >V OUT +V DO(IN-OUT) 5.4 5.5 5.6EN1=LO,EN2=LO
9095100mA I IN max
Maximum input current
EN1=HI,EN2=LO 450
475500
EN2=HI,EN1=LO
K ILIM /R ILIM
A I LIM =500mA to 1.5A 150016101720A ?K ILIM Maximum input current factor
I LIM =200mA to 500mA
13301525
1720I IN max Programmable input current limit range EN2=HI,EN1=LO,R ILIM =8k ?to 1.1k ?2001500mA Input voltage threshold when input current is V IN-DPM
EN2=LO,EN1=X
4.35 4.5 4.63V reduced
V O(REG)–V O(REG)–V O(REG)–(’72,’73,’74)V Output voltage threshold when charging current is 180mV
100mV
30mV
V DPPM
reduced
(’75,'79)
4.2
4.3
4.4
V V BAT =3.6V,R ILIM =1.5k ?,R LOAD =10?→2?V OUT ≤V BAT
V BSUP1Enter battery supplement mode V –40mV V BAT =3.6V,R ILIM =1.5k ?,R LOAD =2?→10?V OUT ≥V BSUP2Exit battery supplement mode
V V BAT –20mV
V O(SC1)Output short-circuit detection threshold,power-on V IN >V UVLO and V IN >V BAT +V IN(DT)0.80.91V Output short-circuit detection threshold,supplement V O(SC2)V IN >V UVLO and V IN >V BAT +V IN(DT)
200250300
mV mode V BAT –V OUT >V O(SC2)indicates short-circuit t DGL(SC2)Deglitch time,supplement mode short circuit 250μs t REC(SC2)
Recovery time,supplement mode short circuit
60
ms
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bq24072,bq24073
bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html,.................................................................................................................................................SLUS810D–SEPTEMBER2008–REVISED JUNE2009 ELECTRICAL CHARACTERISTICS(continued)
Over junction temperature range(0°≤T J≤125°C)and the recommended supply voltage range(unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT BATTERY CHARGER
I BAT Source current for BAT pin short-circuit detection V BAT=1.5V47.511mA
V BAT(SC)BAT pin short-circuit detection threshold V BAT rising 1.6 1.82V
('72,'73,'74,'75) 4.16 4.20 4.23V
V BAT(REG)Battery charge voltage
('79) 4.059 4.100 4.141
V LOWV Pre-charge to fast-charge transition threshold V IN>V UVLO and V IN>V BAT+V IN(DT) 2.93 3.1V
t DGL1(LOWV)Deglitch time on pre-charge to fast-charge transition25ms
t DGL2(LOWV)Deglitch time on fast-charge to pre-charge transition25ms
V BAT(REG)>V BAT>V LOWV,V IN=5V CE=LO,
Battery fast charge current range3001500mA
EN1=LO,EN2=HI
I CHG CE=LO,EN1=LO,EN2=HI,
Battery fast charge current V BAT>V LOWV,V IN=5V,I IN max>I CHG,no load on OUT pin,K ISET/R ISET A
thermal loop and DPPM loop not active
K ISET Fast charge current factor797890975A?
I PRECHG Pre-charge current K PRECHG/R ISET A
K PRECHG Pre-charge current factor7088106A?
CE=LO,(EN1,EN2)≠(LO,LO),A
0.09×I CHG0.1×I CHG0.11×I CHG
V BAT>V RCH,t loop not active Termination comparator detection threshold I TERM (internally set)CE=LO,(EN1,EN2)=(LO,LO), 0.027×I CHG0.033×I CHG0.040×I CHG V BAT>V RCH,t loop not active I BIAS(ITERM)Current for external termination-setting resistor V IN>V UVLO and V IN>V BAT+V IN(DT)727578μA Termination current threshold(externally set)A I TERM K ITERM×R ITERM/R ISET (bq24074) USB500or ISET mode(EN1,EN2)≠(LO,LO)A 0.02250.03000.0375 CE=LO,V BAT>V RCH,t thermal loop not active K Factor for termination detection threshold K ITERM (externally set)(bq24074)USB100mode(EN1,EN2)=(LO,LO), 0.0080.01000.012 CE=LO,V BAT>V RCH,t thermal loop not active t DGL(TERM)Deglitch time,termination detected25ms V BAT(REG)V BAT(REG)V BAT(REG) V RCH Recharge detection threshold V IN>V UVLO and V IN>V BAT+V IN(DT)V –140mV–100mV–60mV t DGL(RCH)Deglitch time,recharge threshold detected62.5ms V BAT=3.6V.Time measured from t DGL(NO-IN)Delay time,input power loss to OUT LDO turn-off20ms V IN:5V→3V1μs fall-time I BAT(DET)Sink current for battery detection V BAT=2.5V57.510mA t DET Battery detection timer BAT high or low250ms BATTERY CHARGING TIMERS t PRECHG Pre-charge safety timer value TMR=floating144018002160s t MAXCHG Charge safety timer value TMR=floating144001800021600s t PRECHG Pre-charge safety timer value18k? t MAXCHG Charge safety timer value18k? K TMR Timer factor364860s/k?BATTERY-PACK NTC MONITOR(1) I NTC NTC bias current V IN>UVLO and V IN>V BAT+V IN(DT)727578μA V HOT High temperature trip point Battery charging,V TS Falling270300330mV V HYS(HOT)Hysteresis on high trip point Battery charging,V TS Rising from V HOT30mV V COLD Low temperature trip point Battery charging,V TS Rising200021002200mV V HYS(COLD)Hysteresis on low trip point Battery charging,V TS Falling from V COLD300mV t DGL(TS)Deglitch time,pack temperature fault detection TS fault detected to charger disable50ms V DIS(TS)TS function disable threshold(bq24072,bq24073)TS unconnected V IN-200mV V THERMAL REGULATION T J(REG)Temperature regulation limit125°C T J(OFF)Thermal shutdown temperature T J Rising155°C T J(OFF-HYS)Thermal shutdown hysteresis20°C (1)These numbers set trip points of0°C and50°C while charging,with3°C hysteresis on the trip points,with a Vishay Type2curve NTC with an R25of10k?. Copyright?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback5 E T D M R E T E R M M R Y S O F F E T M R bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, ELECTRICAL CHARACTERISTICS (continued) Over junction temperature range (0°≤T J ≤125°C)and the recommended supply voltage range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LOGIC LEVELS ON EN1,EN2,CE,SYSOFF,TD V IL Logic LOW input voltage 00.4V V IH Logic HIGH input voltage 1.4 6V I IL Input sink current V IL =0V 1μA I IH Input source current V IH =1.4V 10 μA LOGIC LEVELS ON PGOOD,CHG V OL Output LOW voltage I SINK =5mA 0.4 V RGT PACKAGE (Top View) PIN FUNCTIONS PIN NO. I/O DESCRIPTION NAME '72,'73'74'75,'79External NTC Thermistor Input.Connect the TS input to the NTC thermistor in the battery pack.TS monitors TS 111I a 10k ?NTC thermistor.For applications that do not utilize the TS function,connect a 10k ?fixed resistor from TS to VSS to maintain a valid voltage level on TS. Charger Power Stage Output and Battery Voltage Sense Input.Connect BAT to the positive terminal of the BAT 2,3 2,3 2,3 I/O battery.Bypass BAT to VSS with a 4.7μF to 47μF ceramic capacitor. Charge Enable Active-Low Input.Connect CE to a high logic level to place the battery charger in standby mode.In standby mode,OUT is active and battery supplement mode is still available.Connect CE to a low CE 444I logic level to enable the battery charger.CE is internally pulled down with ~285k ?.Do not leave CE unconnected to ensure proper operation. EN2555I Input Current Limit Configuration https://www.doczj.com/doc/0f11099733.html,e EN1and EN2control the maximum input current and enable USB compliance.See Table 2for the description of the operation states.EN1and EN2are internally pulled EN1666I down with ≈285k ?.Do not leave EN1or EN2unconnected to ensure proper operation. Open-drain Power Good Status Indication Output.PGOOD pulls to VSS when a valid input source is PGOOD 777O detected.PGOOD is high-impedance when the input power is not within specified limits.Connect PGOOD to the desired logic voltage rail using a 1k ?-100k ?resistor,or use with an LED for visual indication.VSS 888–Ground.Connect to the thermal pad and to the ground rail of the circuit. Open-Drain Charging Status Indication Output.CHG pulls to VSS when the battery is charging.CHG is high CHG 9 9 9 O impedance when charging is complete and when charger is disabled.Connect CHG to the desired logic voltage rail using a 1k ?-100k ?resistor,or use with an LED for visual indication. System Supply Output.OUT provides a regulated output when the input is below the OVP threshold and above the regulation voltage.When the input is out of the operation range,OUT is connected to V BAT except OUT 10,1110,1110,11O when SYSOFF is high (bq24075and bq24079only).Connect OUT to the system load.Bypass OUT to VSS with a 4.7μF to 47μF ceramic capacitor. Adjustable Current Limit Programming Input.Connect a 1100?to 8k ?resistor from ILIM to VSS to program ILIM 121212I the maximum input current (EN2=1,EN1=0).The input current includes the system load and the battery charge current.Leaving ILIM unconnected disables all charging. Input Power Connection.Connect IN to the external DC supply (AC adapter or USB port).The input operating range is 4.35V to 6.6V (bq24072,bq24073,bq24075,and bq24079)or 4.35V to 10.5V (bq23074).The input IN 131313I can accept voltages up to 26V without damage but operation is suspended.Connect bypass capacitor 1μF to 10μF to VSS.6Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html,.................................................................................................................................................SLUS810D–SEPTEMBER2008–REVISED JUNE2009 PIN FUNCTIONS(continued) Table1.EN1/EN2Settings EN2EN1Maximum input current into IN pin https://www.doczj.com/doc/0f11099733.html,B100mode https://www.doczj.com/doc/0f11099733.html,B500mode 10Set by an external resistor from ILIM to VSS 11Standby(USB suspend mode) Copyright?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback7 SIMPLIFIED BLOCK DIAGRAM bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, 8Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated TYPICAL CHARACTERISTICS V I V V V V CHG I BAT 2 V/div 400 ms/div V BAT 1A/div 5 V/div 400ms/div A/div I OUT I BAT V 3.6 V BAT 500 mA/div 200 mV/div V 3.825 V OUT 1A/div Supplement Mode Tracking to V +225 mV BAT I OUT I BAT V 3.8 V BAT 500 mA/div 500 mV/div 1 ms/div V 4.4 V OUT 1A/div Supplement Mode I OUT I BAT 200 mV/div 400s/div m V 4.4 V OUT 500 mA/div 500 mA/div 5 V/div 2 V/div 400s/div m 500 mA/div V SYSOFF I BAT V 4 V BAT V 5.5 V OUT V CE I V 3.6 V BAT V CHG 500 mA/div 1 V/div 5 V/div 5 V/div 10 V/div 500 mV/div 1A/div 40s/div m V IN I BAT V 4.2 V BAT V 4.4 V OUT bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html, .................................................................................................................................................SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009 V IN =6V,EN1=1,EN2=0,bq24073application circuit,T A =25°C,unless otherwise noted. ADAPTER PLUG-IN BATTERY CONNECTED BATTERY DETECTION BATTERY DETECTION R LOAD =10? BATTERY INSERTED BATTERY REMOVED Figure 1. Figure 2. Figure 3. ENTERING AND EXITING BATTERY ENTERING AND EXITING BATTERY ENTERING AND EXITING DPPM SUPPLEMENT MODE SUPPLEMENT MODE MODE R LOAD =25?TO 4.5? R LOAD =20?TO 4.5? R LOAD =20?to 9? bq24074 bq24072 Figure 4.Figure 5.Figure 6. SYSTEM ON/OFF WITH INPUT OVP FAULT CONNECTED V IN =6V to 15V V IN =6V R LOAD =10? bq24075,bq24079 Figure 7.Figure 8.Figure 9. Copyright ?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback 9 5 V/div 4 ms/div 2 V/div V I V V 600 400 100Temperature -C o 300200 500 120125 130135140145 I - m A B A T 255075 100T - Junction Temperature - °C J D r o p o u t V o l t a g e - V -V I N O U T 02040 6080100 120 25 5075100T - Junction Temperature - °C J D r o p o u t V o l t a g e - V -V B A T O U T 2.5 3.54 V - O u t p u t V o l t a g e - V O V - Battery Voltage - V BAT 3.60 3.62 3.643.663.683.703.723.743.76 3.783.800255075100125 T - Junction Temperature - °C J V - O u t p u t V o l t a g e - V O 255075100125 T - Junction Temperature - °C J V - O u t p u t V o l t a g e - V O 4.30 4.334.354.384.404.43 4.4525 T - Junction Temperature - °C J V - O u t p u t V o l t a g e - V O 4.180 4.185 4.1904.195 4.200 4.2054.210 51015202530 T - Junction Temperature - °C J V - R e g u l a t i o n V o l t a g e - V B A T bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, TYPICAL CHARACTERISTICS (continued) V IN =6V,EN1=1,EN2=0,bq24073application circuit,T A =25°C,unless otherwise noted. SYSTEM ON/OFF WITH INPUT NOT CONNECTED DROPOUT VOLTAGE V IN =0V vs bq24075,bq24079 THERMAL REGULATION TEMPERATURE Figure 10.Figure 11. Figure 12. DROPOUT VOLTAGE bq24072 bq24072 vs OUTPUT REGULATION VOLTAGE OUTPUT REGULATION VOLTAGE TEMPERATURE vs vs NO INPUT SUPPLY BATTERY VOLTAGE TEMPERATURE Figure 13. Figure 14. Figure 15. bq24073/74 bq24075,bq24079 OUTPUT REGULATION VOLTAGE OUTPUT REGULATION VOLTAGE BAT REGULATION VOLTAGE vs vs vs TEMPERATURE TEMPERATURE TEMPERATURE Figure 16.Figure 17.Figure 18. 10Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated 5 6 78910 V - Input Voltage - V I I - I n p u t C u r r e n t - m A L I M 0 255075100125 T - Junction Temperature - °C J V - O u t p u t V o l t a g e T h r e s h o l d - V O V P 255075100125 T - Junction Temperature - °C J V - O u t p u t V o l t a g e T h r e s h o l d - V O V P 0.95 0.97 0.99 1.01 1.03 1.05 3 3.2 3.4 3.6 3.84 4.2 I - F a s t C h a r g e C u r r e n t -A B A T V - Battery Voltage - V BAT 3 3.2 3.4 3.6 3.84 4.2 I - F a s t C h a r g e C u r r e n t -A B A T V - Battery Voltage - V BAT 2 2.2 2.4 2.6 2.83 I - P r e c h a r g e C u r r e n t -A B A T V - Battery Voltage - V BAT 2 2.2 2.4 2.6 2.8 3 I - P r e c h a r g e C u r r e n t -A B A T V - Battery Voltage - V BAT bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html, .................................................................................................................................................SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009 TYPICAL CHARACTERISTICS (continued) V IN =6V,EN1=1,EN2=0,bq24073application circuit,T A =25°C,unless otherwise noted. bq24072/73/75/79 bq24074 OVERVOLTAGE PROTECTION OVERVOLTAGE PROTECTION bq24074 THRESHOLD THRESHOLD INPUT CURRENT LIMIT vs vs vs TEMPERATURE TEMPERATURE INPUT VOLTAGE Figure 19. Figure 20. Figure 21. FASTCHARGE CURRENT FASTCHARGE CURRENT PRECHARGE CURRENT vs vs vs BATTERY VOLTAGE BATTERY VOLTAGE BATTERY VOLTAGE Figure 22.Figure 23. Figure 24. PRECHARGE CURRENT vs BATTERY VOLTAGE Figure 25. Copyright ?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback 11 APPLICATION CIRCUITS bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, V IN =UVLO to V OVP ,I FASTCHG =800mA,I IN(MAX)=1.3A,Battery Temperature Charge Range =0°C to 50°C,6.25hour Fastcharge Safety Timer Figure https://www.doczj.com/doc/0f11099733.html,ing bq24072/bq24073in a Host Controlled Charger Application 12Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html, .................................................................................................................................................SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009 V IN =UVLO to V OVP ,I FASTCHG =800mA,I IN(MAX)= 1.3A,I TERM =110mA,Battery Temperature Charge Range =0°C to 50°C,Safety Timers disabled Figure https://www.doczj.com/doc/0f11099733.html,ing bq24074in a Stand Alone Charger Application V IN =UVLO to V OVP ,I FASTCHG =800mA,I IN(MAX)=1.3A,Battery Temperature Charge Range =0°C to 50°C,6.25hour Fastcharge Safety Timer Figure https://www.doczj.com/doc/0f11099733.html,ing bq24075or bq24079to Disconnect the Battery from the System Copyright ?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback 13 EXPLANATION OF DEGLITCH TIMES AND COMPARATOR HYSTERESIS V OVP V BAT V + V - V BAT IN(DT)UVLO - V V I CHG I V RCH bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, Figures not to scale Figure 29.Power-Up,Power-Down,Power Good Indication Figure 30.Pre-to Fast-Charge,Fast-to Pre-Charge Transition –t DGL1(LOWV),t DGL2(LOWV) Figure 31.Recharge –t DGL(RCH) 14 Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated V V V - V COLD V - V HOT V bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html, .................................................................................................................................................SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009 Figure 32.OUT Short-Circuit –Supplement Mode Figure 33.Battery Pack Temperature Sensing –TS Pin.Battery Temperature Increasing Copyright ?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback 15 DETAILED FUNCTIONAL DESCRIPTION UNDERVOLTAGE LOCKOUT (UVLO) POWER ON bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, The bq2407x devices are integrated Li-Ion linear chargers and system power path management devices targeted at space-limited portable applications.The device powers the system while simultaneously and independently charging the battery.This feature reduces the number of charge and discharge cycles on the battery,allows for proper charge termination and enables the system to run with a defective or absent battery pack.It also allows instant system turn-on even with a totally discharged battery.The input power source for charging the battery and running the system can be an AC adapter or a USB port.The devices feature Dynamic Power Path Management (DPPM),which shares the source current between the system and battery charging,and automatically reduces the charging current if the system load increases.When charging from a USB port,the input dynamic power management (V IN -DPM)circuit reduces the input current if the input voltage falls below a threshold,preventing the USB port from crashing.The power-path architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents.The bq2407X family remains in power down mode when the input voltage at the IN pin is below the undervoltage threshold (UVLO). During the power down mode the host commands at the control inputs (CE,EN1and EN2)are ignored.The Q1FET connected between IN and OUT pins is off,and the status outputs CHG and PGOOD are high impedance.The Q2FET that connects BAT to OUT is ON.(If SYSOFF is high,Q2is off).During power down mode,the V OUT(SC2)circuitry is active and monitors for overload conditions on OUT.When V IN exceeds the UVLO threshold,the bq2407x powers up.While V IN is below V BAT +V IN(DT),the host commands at the control inputs (CE,EN1and EN2)are ignored.The Q1FET connected between IN and OUT pins is off,and the status outputs and are high impedance.The Q2FET that connects BAT to OUT is ON.(If SYSOFF is high,Q2is off).During this mode,the V OUT(SC2)circuitry is active and monitors for overload conditions on OUT. Once V IN rises above V BAT +V IN(DT),PGOOD is driven low to indicate the valid power status and the CE,EN1,and EN2inputs are read.The device enters standby mode if (EN1=EN2=HI)or if an input overvoltage condition occurs.In standby mode,Q1is OFF and Q2is ON so OUT is connected to the battery input.(If SYSOFF is high,FET Q2is off).During this mode,the V OUT(SC2)circuitry is active and monitors for overload conditions on OUT. When the input voltage at IN is within the valid range:V IN >UVLO AND V IN >V BAT +V IN(DT)AND V IN 16Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html,.................................................................................................................................................SLUS810D–SEPTEMBER2008–REVISED JUNE2009 Array Figure34.Startup Flow Diagram Copyright?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback17 OVERVOLTAGE PROTECTION (OVP) DYNAMIC POWER-PATH MANAGEMENT INPUT SOURCE CONNECTED (ADAPTER or USB) 100μs/div 20 m A /d i v U S B 100 C u r r e n t L i m i t bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, The bq2407x accepts inputs up to 28V without damage.Additionally,an overvoltage protection (OVP)circuit is implemented that shuts off the internal LDO and discontinues charging when V IN >V OVP for a period long than t DGL(OVP).When in OVP,the system output (OUT)is connected to the battery and is high impedance.Once the OVP condition is removed,a new power on sequence starts (See the SubSec20.1section).The safety timers are reset and a new charge cycle will be indicated by the output. The bq2407x features an OUT output that powers the external load connected to the battery.This output is active whenever a source is connected to IN or BAT.The following sections discuss the behavior of OUT with a source connected to IN to charge the battery and a battery source only.With a source connected,the dynamic power-path management (DPPM)circuitry of the bq2407x monitors the input current continuously.The OUT output for the bq24073/74/75/79is regulated to a fixed voltage (V O(REG)).For the bq24072,OUT is regulated to 200mV above the voltage at BAT.When the BAT voltage falls below 3.2V,OUT is clamped to 3.4V.This allows for proper startup of the system load even with a discharged battery.The current into IN is shared between charging the battery and powering the system load at OUT.The bq2407x has internal selectable current limits of 100mA (USB100)and 500mA (USB500)for charging from USB ports,as well as a resistor-programmable input current limit. The bq2407x is USB IF compliant for the inrush current testing.The USB spec allows up to 10μF to be hard started,which establishes 50μC as the maximum inrush charge value when exceeding 100mA.The input current limit for the bq2407x prevents the input current from exceeding this limit,even with system capacitances greater than 10μF.Note that the input capacitance to the device must be selected small enough to prevent a violation (<10μF),as this current is not limited.Figure 35demonstrates the startup of the bq2407x and compares it to the USB-IF specification. Figure https://www.doczj.com/doc/0f11099733.html,B-IF Inrush Current Test The input current limit selection is controlled by the state of the EN1and EN2pins as shown in Table 1.When using the resistor-programmable current limit,the input current limit is set by the value of the from the ILIM pin to VSS,and is given by the equation: I IN-MAX =K ILIM /R ILIM The input current limit is adjustable up to 1.5A.The valid resistor range is 1.1k ?to 8k ?. When the IN source is connected,priority is given to the system load.The DPPM and Battery Supplement modes are used to maintain the system load.Figure 37and Figure 38illustrate examples of the DPPM and supplement modes.These modes are explained the 18 Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated 4 ms/div 500mV/div USB5Current Limit 00200mA/div 200mA/div 200mA/div I OUT I IN V IN (5V) I BAT Input collapses Input current limit is reduced to prevent crashing the supply Input regulated to V IN_DPM bq24072,bq24073 bq24074,bq24075,bq24079 https://www.doczj.com/doc/0f11099733.html, .................................................................................................................................................SLUS810D–SEPTEMBER 2008–REVISED JUNE 2009 Input DPM Mode (V IN -DPM) The bq2407x utilizes the V IN -DPM mode for operation from current-limited USB ports.When EN1and EN2are configured for USB100(EN2=0,EN1=0)or USB500(EN2=0,EN2=1)modes,the input voltage is monitored.If V IN falls to V IN-DPM ,the input current limit is reduced to prevent the input voltage from falling further.This prevents the bq2407x from crashing poorly designed or incorrectly configured USB sources.Figure 36shows the V IN -DPM behavior to a current limited source.In this figure,the input source has a 400mA and the device is in USB500mode (EN1=1,EN2=0). Figure 36.V IN -DPM Waveform DPPM Mode When the sum of the charging and system load currents exceeds the maximum input current (programmed with EN1,EN2and ILIM pins),the voltage at OUT decreases.Once the voltage on the OUT pin falls to V DPPM ,the bq2407x enters DPPM mode.In this mode,the charging current is reduced as the OUT current increases in order to maintain the system output.Battery termination is disabled while in DPPM mode.Battery Supplement Mode While in DPPM mode,if the charging current falls to zero and the system load current increases beyond the programmed input current limit,the voltage at OUT reduces further.When the OUT voltage drops below the V BSUP1threshold,the battery supplements the system load.The battery stops supplementing the system load when the voltage at OUT rises above the V BSUP2threshold. During supplement mode,the battery supplement current is not regulated (BAT-FET is fully on),however there is a short circuit protection circuit built in.Figure 5demonstrates supplement mode.If during battery supplement mode,the voltage at OUT drops V O(SC2)the BAT voltage,the OUT output is turned off if the overload exists after t DGL(SC2).The short circuit recovery timer then starts counting.After t REC(SC2),OUT turns on and attempts to restart.If the short circuit remains,OUT is turned off and the counter restarts.Battery termination is disabled while in supplement mode. Copyright ?2008–2009,Texas Instruments Incorporated Submit Documentation Feedback 19 I O U T I I N I B A T V O U T bq24072,bq24073 bq24074,bq24075,bq24079 SLUS810D–SEPTEMBER 2008–REVISED JUNE https://www.doczj.com/doc/0f11099733.html, Figure 37.bq24072DPPM and Battery Supplement Modes (V OREG =V BAT +225mV,V BAT =3.6V) 20 Submit Documentation Feedback Copyright ?2008–2009,Texas Instruments Incorporated