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  • bq2408x 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC With Thermal Regulation

    • SLUS784E December   2007  – December 2015 BQ24085 , BQ24086 , BQ24087 , BQ24088

      PRODUCTION DATA.  

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  • bq2408x 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC With Thermal Regulation
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Options
  6. 6 Pin Configuration and Functions
  7. 7  Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Dissipation Ratings
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Control Logic Overview
      2. 8.3.2  Temperature Qualification (Applies Only to Versions With TS Pin Option)
      3. 8.3.3  Input Overvoltage Detection, Power Good Status Output
      4. 8.3.4  Charge Status Outputs
      5. 8.3.5  Battery Charging: Constant Current Phase
      6. 8.3.6  Charge Current Translator
      7. 8.3.7  Battery Voltage Regulation
      8. 8.3.8  Pre-Charge Timer
      9. 8.3.9  Thermal Protection Loop
      10. 8.3.10 Thermal Shutdown And Protection
      11. 8.3.11 Dynamic Timer Function
      12. 8.3.12 Charge Termination Detection and Recharge
      13. 8.3.13 Battery Absent Detection - Voltage Mode Algorithm
      14. 8.3.14 Charge Safety Timer
      15. 8.3.15 Short-Circuit Protection
      16. 8.3.16 Startup With Deeply Depleted Battery Connected
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power Down
      2. 8.4.2 Sleep Mode
      3. 8.4.3 Overvoltage Lockout
      4. 8.4.4 Stand-By Mode
      5. 8.4.5 Begin Charge Mode
      6. 8.4.6 Charging Mode
      7. 8.4.7 Suspend Mode
      8. 8.4.8 LDO Mode Operation
      9. 8.4.9 State Machine Diagram
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 bq24086 and bq24088 Typical Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Selecting Input and Output Capacitor
          2. 9.2.1.2.2 Using Adapters With Large Output Voltage Ripple
          3. 9.2.1.2.3 Calculations
        3. 9.2.1.3 Application Curves
      2. 9.2.2 bq24085 Typical Application
        1. 9.2.2.1 Design Requirements
      3. 9.2.3 bq24087 Typical Application
        1. 9.2.3.1 Design Requirements
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE
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DATA SHEET

bq2408x 750-mA Single-Chip Li-Ion and Li-Pol Charge Management IC With Thermal Regulation

1 Features

  • Ideal for Low-Dropout Designs for Single-Cell Li-Ion or Li-Pol Packs in Space Limited Applications
  • Integrated Power FET and Current Sensor for up to 750-mA Charge Applications
  • Reverse Leakage Protection Prevents Battery Drainage
  • ±0.5% Voltage Regulation Accuracy
  • Thermal Regulation Maximizes Charge Rate
  • Charge Termination by Minimum Current and Time
  • Precharge Conditioning With Safety Timer
  • Status Outputs for LED or System Interface Indicate Charge, Fault, and Power Good Outputs
  • Short-Circuit and Thermal Protection
  • Automatic Sleep Mode for Low Power Consumption
  • Small 3×3 mm MLP Package
  • Selectable Battery Insertion and Battery Absent Detection
  • Input Overvoltage Protection
    • 6.5 V and 10.5 V Options

2 Applications

  • PDA, MP3 Players, Digital Cameras
  • Internet Appliances and Handheld Devices

3 Description

The bq2408x series are highly integrated Li-Ion and Li-Pol linear chargers, targeted at space-limited portable applications. The bq2408x series offers a variety of protection features and functional options, while still implementing a complete charging system in a small package. The battery is charged in three phases: conditioning, constant or thermally regulated current, and constant voltage. Charge is terminated based on minimum current. An internal programmable charge timer provides a backup protection feature for charge termination and is dynamically adjusted during the thermal regulation phase. The bq2408x automatically restarts the charge if the battery voltage falls below an internal threshold; sleep mode is set when the external input supply is removed. Multiple versions of this device family enable easy design of the bq2408x in cradle chargers or in the end equipment, while using low cost or high-end AC adapters.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq2408x VSON (10) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit

bq24085 bq24086 bq24087 bq24088 typ_app_lus784.gif

4 Revision History

Changes from D Revision (August 2009) to E Revision

  • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo

5 Device Options

CHARGE VOLTAGE INPUT OVERVOLTAGE TERMINATION ENABLE SAFETY TIMER ENABLE POWER GOOD STATUS IC ENABLE PACK TEMP PACK VOLTAGE DETECTION (ABSENT) DEVICES(1)(2)
4.2 V 6.5 V TMR pin TMR pin PG pin No TS pin With timer enabled bq24086DRCR
bq24086DRCT
4.2 V 6.5 V TMR pin TMR pin PG pin CE pin No With timer enabled bq24085DRCR
bq24085DRCT
4.2 V 6.5 V TE pin TMR pin No CE pin No With termination enabled bq24087DRCR
bq24087DRCT
4.2 V 10.5 V TMR pin TMR pin PG pin No TS pin With timer enabled bq24088DRCR
bq24088DRCT
(1) The bq24085/6/7/8 are only available taped and reeled. Add suffix R to the part number for quantities of 3,000 devices per reel (for example, bq24085DRCR). Add suffix T to the part number for quantities of 250 devices per reel (for example, bq24085/6/7DRCT).
(2) This product is RoHS compatible, including a lead concentration that does not exceed 0.1% 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) above 0.1% of total product weight.

6 Pin Configuration and Functions

bq24086 and bq24088 DRC Package
10-Pin VSON
Top View
bq24085 bq24086 bq24087 bq24088 pin_assg_01_lus784.gif
bq24085 DRC Package
10-Pin VSON
Top View
bq24085 bq24086 bq24087 bq24088 pin_assg_02_lus784.gif
bq24087 DRC Package
10-Pin VSON
Top View
bq24085 bq24086 bq24087 bq24088 pin_assg_03_lus784.gif

Pin Functions

PIN I/O DESCRIPTION
NAME bq24086/8 bq24085 bq24087
BAT 9 9 9 I Battery voltage sense input. Connect to the battery positive terminal. Connect a 390-Ω resistor from BAT to OUT for I(OUT) < 200 mA.
CE – 8 7 I Charge enable input. CE = LO enables charger. CE = HI disables charger.
IN 1 1 1 I Charge input voltage and internal supply. Connect a 1-μF (minimum) capacitor from IN to VSS. CIN ≥ COUT
ISET 6 6 6 O Charge current set point, resistor connected from ISET to VSS sets charge current value. Connect a 0.1-μF capacitor from BAT to ISET for I(OUT) < 200 mA.
OUT 10 10 10 O Charge current output. Connect to the battery positive terminal. Connect a 1-μF (minimum) capacitor from OUT to VSS.
PG 7 7 O Power good status output (open-collector), active low.
STAT1 3 3 3 O Charge status output 1 (open-collector, see Table 3).
STAT2 4 4 4 O Charge status output 2 (open-collector, see Table 3).
TE – – 8 I Termination enable input. TE = LO enables termination detection and battery absent detection. TE = HI disables termination detection and battery absent detection.
TMR 2 2 2 I Safety timer program input, timer disabled if floating. Connect a resistor to VSS pin to program safety timer timeout value.
TS 8 – – I Temperature sense input, connect to battery pack thermistor. Connect an external resistive divider to program temperature thresholds.
VSS 5 5 5 I Ground
Exposed Thermal Pad Pad Pad Pad – There is an internal electrical connection between the exposed thermal pad and Vss pin of the IC. The exposed thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not use the thermal pad as the primary ground input for the IC. VSS pin must be connected to ground at all times.

7 Specifications

7.1 Absolute Maximum Ratings(1)

MIN MAX UNIT
Supply voltage (IN with respect to Vss) –0.3 20 V(2)
Input voltage on IN, STATx, PG, TS, CE, TMR (all with respect to Vss) –0.3 V(IN) V
Input voltage on OUT, BAT, ISET (all with respect to Vss) –0.3 7 V
Output sink current (STATx) + PG 15 mA
Output current (OUT pin) 2 A
TA Operating free-air temperature –40 155 °C
TJ Junction temperature –40 150 °C
Tstg Storage temperature –65 150 °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.
(2) The bq24085/6/7/8 family can withstand up to 18 V maximum continuously, 20 V for maximum of 2000 hours and 26 V for a maximum for 87 hours.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±3000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

MIN MAX UNIT
V(IN) Supply voltage Battery absent detection not functional 3.5 4.35 V
V(IN) Supply voltage Battery absent detection functional 4.35 6.5 V
R(TMR) Safety timer program resistor 33 100 KΩ
TJ Junction temperature 0 125 °C

7.4 Thermal Information

THERMAL METRIC(1) bq2408x UNIT
DRC (VSON)
10 PINS
RθJA Junction-to-ambient thermal resistance 46.7 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 65.9 °C/W
RθJB Junction-to-board thermal resistance 21.3 °C/W
ψJT Junction-to-top characterization parameter 1.6 °C/W
ψJB Junction-to-board characterization parameter 21.4 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 3.6 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

over recommended operating range, TJ = 0 –125°C range, See the Application and Implementation section, typical values at TJ = 25°C (unless otherwise noted), RTMR = 49.9 KΩ
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER DOWN THRESHOLD – UNDERVOLTAGE LOCKOUT
VUVLO Power down threshold V(IN) = 0 V, increase V(OUT): 0 → 3 V OR
V(OUT) = 0 V, increase V(IN): 0 → 3 V,
CE = LO (1)		 1.5 3 V
INPUT POWER DETECTION(2)
VIN(DT) Input power detection threshold V(IN) detected at [V(IN) – V(OUT)] > VIN(DT) 130 mV
VHYS(INDT) Input power detection hysteresis Input power not detected at
[V(IN) – V(OUT)] < [VIN(DT) – VHYS(INDT)]		 30 mV
INPUT OVERVOLTAGE PROTECTION
V(OVP) Input overvoltage detection threshold V(IN) increasing bq24088 10.2 10.5 11.7 V
bq24085/6/7 6.2 6.5 7
VHYS(OVP) Input overvoltage hysteresis V(IN) decreasing bq24088 0.5 V
bq24085/6/7 0.2
QUIESCENT CURRENT
ICC(CHGOFF) IN pin quiescent current, charger off Input power detected,
CE = HI		 V(IN) = 6 V 100 200 μA
V(IN) = 16.5 V 350
ICC(CHGON) IN pin quiescent current, charger on Input power detected, CE = LO, VBAT = 4.5 V 4 6 mA
IBAT(DONE) Battery leakage current after termination into IC Input power detected, charge terminated,
CE = LO		 1 5 μA
IBAT(CHGOFF) Battery leakage current into IC, charger off Input power detected, CE = HI OR
input power not detected, CE = LO		 1 5 μA
TS PIN COMPARATOR
V(TS1) Lower voltage temperature threshold Hot detected at V(TS) < V(TS1); NTC thermistor 29 30 31 %V(IN)
V(TS2) Upper voltage temperature threshold Cold detected at V(TS) > V(TS2); NTC thermistor 60 61 62 %V(IN)
VHYS(TS) Hysteresis Temp OK at V(TS) > [ V(TS1) + VHYS(TS) ] OR
V(TS) < [ V(TS2) – VHYS(TS) ]		 2 %V(IN)
CE INPUT
VIL Input (low) voltage V(/CE) 0 1 V
VIH Input (high) voltage V(/CE) 2 V
STAT1, STAT2 AND PG OUTPUTS(3)
VOL Output (low) saturation voltage Iout = 1 mA (sink) 200 mV
THERMAL SHUTDOWN
T(SHUT) Temperature trip Junction temperature, temp rising 155 °C
T(SHUTHYS) Thermal hysteresis Junction temperature 20 °C
VOLTAGE REGULATION(4)
VO(REG) Output voltage 4.20 V
VO(TOL) Voltage regulation accuracy TA = 25°C –0.5% 0.5%
–1% 1%
V(DO) Dropout voltage, V(IN) – V(OUT) I(OUT) = 750 mA 600 mV
CURRENT REGULATION(5)
IO(OUT) Output current range V(BAT) > V(LOWV), IO(OUT) = I(OUT) = K(SET) × V(SET)/R(SET) 50 750 mA
V(SET) Output current set voltage V(ISET) = V(SET), V(LOWV) < V(BAT) ≤ VO(REG) 2.45 2.5 2.55 V
K(SET) Output current set factor 100 mA ≤ IO(OUT) ≤ 750 mA 175 182 190
10 mA ≤ IO(OUT) < 100 mA 180 215 250
RISET External resistor range Resistor connected to ISET pin 0.6 10 kΩ
PRECHARGE AND OUTPUT SHORT-CIRCUIT CURRENT REGULATION(6)
V(LOWV) Precharge to fast-charge transition threshold V(BAT) increasing 2.8 2.95 3.15 V
V(SC) Precharge to short-circuit transition threshold V(BAT) decreasing 1.2 1.4 1.6 V
V(SCIND) Short-circuit indication V(BAT) decreasing 1.6 1.8 2
IO(PRECHG) Precharge current range V(SC) < VI(BAT) < V(LOWV), t < t(PRECHG)
IO(PRECHG) = K(SET) × V(PRECHG)/R(ISET)		 5 75 mA
V(PRECHG) Precharge set voltage V(ISET) = V(PRECHG), V(SC) < VI(BAT) < V(LOWV),
t < t(PRECHG)		 225 250 280 mV
IO(SHORT) Output shorted regulation current VSS ≤ V(BAT) ≤ V(SCI),
IO(SHORT) = I(OUT), V(BAT)= VSS, Internal pullup resistor,
TJ = 25°C		 VPOR < VIN < 6.0 V 7 15 24 mA
6.0 V < VIN < VOVP 15
TEMPERATURE REGULATION (Thermal regulation™)(7)
TJ(REG) Temperature regulation limit V(IN) = 5.5 V, V(BAT) = 3.2 V, Fast charge current set to 1 A 101 112 125 °C
I(MIN_TJ(REG)) Minimum current in thermal regulation V(LOWV) < V(BAT) < VO(REG),
0.7 kΩ < R(ISET) < 1.18 kΩ		 105 125 mA
CHARGE TERMINATION DETECTION(9)
I(TERM) Termination detection current range V(BAT) > V(RCH), I(TERM) = K(SET) × V(TERM)/R(ISET) 5 75 mA
V(TERM) Charge termination detection set voltage(8) V(BAT) > V(RCH) 225 250 275 mV
BATTERY RECHARGE THRESHOLD
V(RCH) Recharge threshold detection [VO(REG)–V(BAT) ] > V(RCH) 75 100 135 mV
TIMERS(10)
VTMR(OFF) Charge timer and termination enable threshold Charge timer AND termination disabled at: V(TMR) > VTMR(OFF) bq24085/86/88 2.5 3 3.5 V
Charge timer enable threshold Charge timer disabled at:
V(TMR) > VTMR(OFF)		 bq24087
BATTERY DETECTION THRESHOLDS
IDET(DOWN) Battery detection current (sink) 2 V < V(BAT) < VO(REG) 1 2 3.2 mA
IDET(UP) Battery detection current (source) 2 V < V(BAT) < VO(REG) IO(PRECHG) mA
TIMER FAULT RECOVERY
I(FAULT) Fault Current (source) V(OUT) < V(RCH) 0.8 1.1 mA
OUTPUT CURRENT SAFETY LIMIT(11)
I(SETSC) Charge overcurrent safety V(ISET) = VSS 1.5 A
(1) Specified by design, not production tested.
(2) CE = HI or LOW, V(IN) > 3.5 V
(3) V(IN) ≥ VO(REG) + V(DO-MAX)
(4) V(IN) ≥ VO(REG) + V(DO-MAX), I(TERM) < I(OUT) < IO(OUT), charger enabled, no fault conditions detected.
(5) V(IN) > V(OUT) > V(DO-MAX), charger enabled, no fault conditions detected.
(6) V(IN)–V(OUT) > V(DO-MAX) , V(IN) ≥ 4.5 V, charger enabled, no fault conditions detected, RTMR = 50 K or V(TMR)=OPEN; thermal regulation loop not active.
(7) Charger enabled, no fault conditions detected.
(8) The voltage on the ISET pin is compared to the V(TERM) voltage to determine when the termination should occur.
(9) VO(REG) = 4.2 V, charger enabled, no fault conditions detected, thermal regulation loop not active, RTMR = 50 K or TMR pin open.
(10) CE = LO, charger enabled, no fault conditions detected, V(TMR) < 3 V, timers enabled.
(11) V(IN) ≥ 4.5 V, charger enabled, ISET shorted to GND.

7.6 Timing Requirements

over recommended operating range, TJ = 0 –125°C range, See the Application and Implementation section, typical values at TJ = 25°C (unless otherwise noted), RTMR = 49.9 KΩ
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER DOWN THRESHOLD – UNDERVOLTAGE LOCKOUT
tDGL(PG) Deglitch time on power good V(IN) = 0 V → 5 V in 1 μs to
PG:HI → LO		 2 ms
INPUT POWER DETECTION(1)
tDGL(NOIN) Delay time, input power not detected status(2) PG: LO →HI after tDGL(NOIN) 10 μs
tDLY(CHGOFF) Charger off delay Charger turned off after tDLY(CHGOFF), Measured from PG: LO → HI; Timer reset after tDLY(CHGOFF) 25 ms
INPUT OVERVOLTAGE PROTECTION
tDGL(OVDET) Input overvoltage detection delay CE = HI or LO, Measured from V(IN) > V(OVP) to
PG: LO → HI; VIN increasing		 100 μs
tDGL(OVNDET) Input overvoltage not detected delay(2) CE = HI or LO, Measured from V(IN) < V(OVP)
to PG: HI → LO; V(IN) decreasing		 100 μs
VOLTAGE AND CURRENT REGULATION TIMING(3)
tPWRUP(CHG) Input power detection to full charge current time delay Measured from PG:HI → LO to I(OUT) > 100 mA,
CE = LO, IO(OUT) = 750 mA, V(BAT) = 3.5 V 		25 ms
tPWRUP(EN) Charge enable to full charge current delay Measured from CE:HI → LO to I(OUT) >100 mA, IO(OUT) = 750 mA, V(BAT)= 3.5 V, V(IN) = 4.5 V, Input power detected 25 ms
tPWRUP(LDO) Input power detection to voltage regulation delay, LDO mode set, no battery or load connected Measured from PG:HI → LO to V(OUT) > 90% of charge voltage regulation;
V(TMR) = OPEN, LDO mode set, no battery and no load at OUT pin, CE = LO		 25 ms
CHARGE TERMINATION DETECTION(4)
tDGL(TERM) Deglitch time, termination detected V(ISET) decreasing 50 ms
BATTERY RECHARGE THRESHOLD
tDGL(RCH) Deglitch time, recharge detection V(BAT) decreasing 350 ms
TIMERS(5)
t(CHG) Charge safety timer range t(CHG) = K(CHG) × RTMR ; thermal loop not active 3 10 hours
K(CHG) Charge safety timer constant V(BAT) > V(LOWV) 0.08 0.1 0.12 hr/kΩ
t(PCHG) Pre-charge safety timer range t(PCHG) = K(PCHG) × t(CHG) ; Thermal regulation loop not active 1080 3600 s
K(PCHG) Pre-charge safety timer constant V(BAT) < V(LOWV) 0.08 0.1 0.12
BATTERY DETECTION THRESHOLDS
t(DETECT) Battery detection time 2 V < V(BAT) < VO(REG), Thermal regulation loop not active; RTMR = 50 kΩ, IDET(down) or IDET (UP) 125 ms
(1) CE = HI or LOW, V(IN) > 3.5 V
(2) Specified by design, not production tested.
(3) V(IN) > V(OUT) + V(DO-MAX), charger enabled, no fault conditions detected, RTMR = 50 K or V(TMR) = OPEN; thermal regulation loop not active.
(4) VO(REG) = 4.2 V, charger enabled, no fault conditions detected, thermal regulation loop not active, RTMR = 50 K or TMR pin open.
(5) CE = LO, charger enabled, no fault conditions detected, V(TMR) < 3 V, timers enabled.

7.7 Dissipation Ratings(1)

PACKAGE θJC (°C/W) θJA (°C/W)
10-pin DRC 3.21 46.87
(1) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a copper pad on the board. This is connected to the ground plane by a 2×3 via matrix.

7.8 Typical Characteristics

Measured using the typical application circuit shown previously.
bq24085 bq24086 bq24087 bq24088 therm_lp_lus784.gif
Figure 1. Thermal Regulation
bq24085 bq24086 bq24087 bq24088 pc_cur_bat_lus784.gif
Figure 3. Pre-Charge Current vs Battery Voltage
bq24085 bq24086 bq24087 bq24088 kset_lin1_lus784.gif
Figure 5. KSET Linearity vs Fast-Charge Current
bq24085 bq24086 bq24087 bq24088 vdo_ta_lus784.gif
Figure 7. Dropout Voltage vs Temperature
bq24085 bq24086 bq24087 bq24088 tloop_dtc_lus784.gif
Figure 2. DTC Operation
bq24085 bq24086 bq24087 bq24088 fc_cur_bat_lus784.gif
Figure 4. Fast-Charge Current vs Battery Voltage
bq24085 bq24086 bq24087 bq24088 kset_lin2_lus784.gif
Figure 6. KSET Linearity vs Pre-Charge Current

 
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