BQ25171QWDRCRQ1_技术文档

BQ25171-Q1

ZHCSNP0A –AUGUST 2020 –REVISED MARCH 2021

BQ25171-Q1：适用于1-2 节锂离子、磷酸铁锂以及1-6 节镍氢电池的汽车类、

独立800mA 线性电池充电器

1 特性

3 说明

• 符合面向汽车应用的AEC-Q100 标准

BQ25171-Q1 是一款符合汽车标准的800mA 线性充电

器，适用于1-2 节锂离子、锂聚合物和磷酸铁锂电池，

以及 1-6 节镍氢电池应用。该器件具有为电池充电的

单电源输出。只要安全计时器期间内平均系统负载不会

妨碍电池充满电，就可以使系统负载与电池并联。当系

统负载与电池并联时，充电电流会由系统和电池共享。

– 温度等级1：–40°C ≤T_A≤125°C

– HBM ESD 分类等级2

– CDM ESD 分类等级C4B

• 可承受40V 负载突降，支持直接从3V 至18V 工作

范围的主电池为备用电池充电

• 自动睡眠模式，可降低功耗

该器件分三个阶段为锂离子电池充电：对完全放电电池

进行恢复性充电的预充电阶段，为电池充上大部分电量

的恒流快速充电阶段，以及使电池电量充满的电压调节

阶段。

– 350nA 电池泄漏电流

– 禁用充电时，输入泄漏电流为2µA

• 支持多化合物电池

– 1-2 节锂离子、锂聚合物和磷酸铁锂电池

– 1-6 节镍氢电池（借助间歇性充电支持）

• 操作可使用外部电阻器进行编程

– VSET 用于为锂离子电池设置3.5V 至8.4V 的电

池稳压电压，或为镍氢电池设置1 至6 节

– ISET 用于设置10mA 至800mA 的充电电流

– CHM_TMR 用于将电池化学成分设置为锂离子

或镍氢并设置充电计时器时间

• 高精度

该器件只会以恒定电流模式为镍氢电池充电，并会在可

编程计时器到期或电池电压超过VOUT_OVP 阈值时，

终止充电周期。在所有充电阶段，内部控制环路都会

监控 IC 结温，当其超过内部温度阈值 T_REG时，它会

减少充电电流。

器件信息

器件型号⁽¹⁾

BQ25171-Q1

封装尺寸（标称值）

封装

VSON (10)

3.0mm x 3.0mm

– 充电电压精度为±0.5%

– 充电电流精度为±10%

(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附

录。

• 充电特性

1s~2s Li-Ion, LiFePO4

1s~6s NiMH

Abs. Max: 13V

V_IN: 3.0V œ 18V

Abs. Max: 40V

– 预充电电流为20% ISET

IN

OUT

– 终止电流为10% ISET

V_REF

– NTC 热敏电阻输入用于监控电池温度

– CE 引脚用于充电功能控制

– 两个开漏输出用于状态和故障指示

• 集成故障保护

CHM_TMR

VSET

STAT1

STAT2

TS

ISET

– 18V 输入过压保护

– 基于VSET 的输出过压保护

– 1000mA 过流保护

GND

/CE

HOST

BQ25171-Q1

– 125°C 热调节；150°C 热关断保护

– OUT 短路保护

简化版原理图

– VSET、ISET、CHM_TMR 引脚短路/开路保护

2 应用

• 远程信息处理控制单元(TCU)

• 紧急呼叫(eCall)

• 车队管理、资产跟踪

• 远程无钥匙门禁(RKE) 钥匙扣

本文档旨在为方便起见，提供有关TI 产品中文版本的信息，以确认产品的概要。有关适用的官方英文版本的最新信息，请访问

www.ti.com，其内容始终优先。TI 不保证翻译的准确性和有效性。在实际设计之前，请务必参考最新版本的英文版本。

English Data Sheet: SLUSDK0

BQ25171-Q1

ZHCSNP0A –AUGUST 2020 –REVISED MARCH 2021

www.ti.com.cn

Table of Contents

7.4 Device Functional Modes..........................................22

8 Application and Implementation..................................24

8.1 Application Information............................................. 24

8.2 Typical Applications.................................................. 24

9 Power Supply Recommendations................................30

10 Layout...........................................................................30

10.1 Layout Guidelines................................................... 30

10.2 Layout Example...................................................... 30

11 Device and Documentation Support..........................31

11.1 Device Support........................................................31

11.2 Receiving Notification of Documentation Updates..31

11.3 支持资源..................................................................31

11.4 Trademarks............................................................. 31

11.5 静电放电警告...........................................................31

11.6 术语表..................................................................... 31

12 Mechanical, Packaging, and Orderable

1 特性................................................................................... 1

2 应用................................................................................... 1

3 说明................................................................................... 1

4 Revision History.............................................................. 2

5 Pin Configuration and Functions...................................3

6 Specifications.................................................................. 4

6.1 Absolute Maximum Ratings ....................................... 4

6.2 ESD Ratings .............................................................. 4

6.3 Recommended Operating Conditions ........................4

6.4 Thermal Information ...................................................5

6.5 Electrical Characteristics ............................................6

6.6 Timing Requirements .................................................8

6.7 典型特性......................................................................9

7 Detailed Description......................................................11

7.1 Overview................................................................... 11

7.2 Functional Block Diagram.........................................13

7.3 Feature Description...................................................14

Information.................................................................... 32

4 Revision History

Changes from Revision * (August 2020) to Revision A (March 2021)

Page

• 将“预告信息”更改为“量产数据”..................................................................................................................1

English Data Sheet: SLUSDK0

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5 Pin Configuration and Functions

IN

ISET

/CE

1

2

3

4

5

10

9

OUT

BQ25171-Q1

VSET

8

STAT2

STAT1

CHM_TMR

TS

7

Thermal Pad

6

GND

图5-1. VSON Package 10-Pin (Top View)

表5-1. Pin Functions

I/O

DESCRIPTION

NAME

NUMBER

IN

1

P

I

Input power, connected to external DC supply. Bypass IN with at least 1-μF capacitor to GND,

placed close to the IC.

ISET

CE

2

3

4

Programs the fast-charge current setting. External resistor from ISET to GND defines fast-charge

current value. Recommended range is 30 kΩ (10 mA) to 375 Ω (800 mA). ICHG = K_ISET/ R_ISET

Precharge current is defined as 20% of ICHG. Termination current is defined as 10% of ICHG.

.

I

Active Low Charge Enable pin. Battery charging is enabled when CE pin is low. IC remains in

Shutdown Mode and battery charging is disabled when CE pin is high. An internal pulldown resistor

(R_{PD_CE}) enables the IC by default if this pin is floating.

TS

Temperature Qualification Voltage Input. Connect a negative temperature coefficient (NTC)

thermistor directly from TS to GND (AT103-2 recommended). Charge suspends when the TS pin

voltage is out of range. If TS function is not needed, connect an external 10-kΩresistor from TS to

GND.

GND

5

6

Ground pin

–

CHM_TMR

I

Programs the chemistry and charge time to be used with a pulldown resistor. Valid resistor range is

3.6 kΩto 100 kΩ, values outside this range will suspend charge. Refer to 节7.3.1.2 for voltage

level details.

STAT1

STAT2

VSET

7

8

9

O

I

Open drain charge status 1 output. Connect to pullup rail via 10-kΩresistor.

Open drain charge status 2 output. Connect to pullup rail via 10-kΩresistor.

Programs the regulation voltage for OUT pin with a pull-down resistor. Valid resistor range is 3.6 kΩ

to 100 kΩ, values outside this range will suspend charge. Refer to 节7.3.1.3 for voltage level

details.

OUT

10

P

Battery Connection. System load may be connected in parallel to battery. Bypass OUT with at least

1-μF capacitor to GND, placed close to the IC.

Thermal Pad

Exposed pad beneath the IC for heat dissipation. Solder thermal pad to the board with vias

connecting to solid GND plane.

—

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)⁽¹⁾

MIN

–0.3

MAX

40

UNIT

V

Voltage

IN

OUT

13

V

CE, CHM_TMR, ISET, STAT1, STAT2,

TS, VSET

Voltage

5.5

V

–0.3

Output Sink Current

STAT1, STAT2

5

150

mA

°C

T_J

Junction temperature

Storage temperature

–40

–65

T_stg

°C

(1) Stresses beyond those listed under Absolute Maximum Rating may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under

Recommended Operating Condition. Exposure to absolute-maximum-rated conditions for extended periods may affect device

reliability.

6.2 ESD Ratings

VALUE UNIT

Human body model (HBM), per AEC Q100-002⁽¹⁾

±2000

±750

±500

Corner pins (IN, GND, CHM_TMR,

V_(ESD)Electrostatic discharge

V

Charged device model (CDM), per

AEC Q100-011

OUT)

Other pins

(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

NOM

MAX

18

UNIT

V_IN

Input voltage

3.0

V

V_OUT

Output voltage

10.5

0.8

I_OUT

Output current

A

T_J

Junction temperature

IN capacitor

125

°C

µF

kΩ

%

–40

1

C_IN

C_OUT

OUT capacitor

1

R_{CHM_TMR}

R_VSET

CHM_TMR resistor

VSET resistor

3.6

-1

100

1

R_{VSET_CHM_TMR_TOL}

Tolerance for VSET, and CHM_TMR, resistors

Temperature coefficient for VSET, and CHM_TMR

resistors

R_{VSET_CHM_TMR_TEMPCO}

200

30

ppm/℃

R_ISET

R_TS

ISET resistor

0.375

kΩ

TS thermistor resistor (recommend 103AT-2)

10

English Data Sheet: SLUSDK0

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6.4 Thermal Information

BQ25171-Q1

THERMAL METRIC⁽¹⁾

DRC

10 PINS

37

UNIT

R_θJA

Junction-to-ambient thermal resistance (EVM⁽²⁾

)

°C/W

R_θJA

Junction-to-ambient thermal resistance (JEDEC⁽¹⁾

Junction-to-case (top) thermal resistance

Junction-to-board thermal resistance

)

60.3

73.1

34.2

6.0

R_θJC(top)

R_θJB

Junction-to-top characterization parameter

Junction-to-board characterization parameter

Junction-to-case (bottom) thermal resistance

Ψ_JT

34.2

16.7

Ψ_JB

R_θJC(bot)

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

(2) 1oz Copper, 2-layer board

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6.5 Electrical Characteristics

3.0V < V_IN< 18V and V_IN> V_OUT+ V_SLEEP, T_J= -40°C to +125°C, and T_J= 25°C for typical values (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNIT

QUIESCENT CURRENTS

OUT= 4.2V, IN floating or IN = 0V - 5V,

Charge Disabled (CE high), T_J= 25 °C

0.350

0.8

0.6 µA

0.8 µA

1.2 µA

1.5 µA

I_{Q_OUT}

I_{SD_IN}

Quiescent output current (OUT)

OUT= 4.2V, IN floating or IN = 0V - 5V,

Charge Disabled (CE high), T_J< 105 °C

OUT = 8.4V, IN floating or IN = 0V - 14V,

Charge Disabled (CE high), T_J= 25 °C

OUT = 8.4V, IN floating or IN = 0V - 14V,

Charge Disabled (CE high), T_J< 105 °C

0.8

IN = 5V, Charge Disabled (CE high), no

battery

2

4

6

µA

Shutdown input current (IN) with

charge disabled

IN = 14V, Charge Disabled (CE high), no

battery

3.5

Standby input current (IN) with charge IN = 5V, Charge Enabled (CE low), charge

terminated terminated

I_{STANDBY_IN}

I_{Q_IN}

190

230

0.45

Standby input current (IN) with charge IN = 14V, Charge Enabled (CE low), charge

terminated

IN = 5V, OUT = 3.8V, Charge Enabled (CE

low), ICHG = 0A

Quiescent input current (IN)

0.6 mA

IN = 14V, OUT = 7.6V, Charge Enabled (CE

low), ICHG = 0A

I_{Q_IN}

Quiescent input current (IN)

INPUT

V_{IN_OP}

IN operating range

3.0

3.05

2.80

95

18

3.15

3.10

V

V_{IN_LOWV}

V_SLEEPZ

V_SLEEP

V_{IN_OV}

IN voltage to start charging

IN voltage to stop charging

Exit sleep mode threshold

Sleep mode threshold hysteresis

VIN overvoltage rising threshold

VIN overvoltage falling threshold

IN rising

3.09

2.95

135

80

IN falling

IN rising, V_IN- V_OUT, OUT = 4V

IN falling, V_IN- V_OUT, OUT = 4V

IN rising

175 mV

mV

18.1

18.4

18.2

18.7

V

V_{IN_OVZ}

IN falling

CONFIGURATION PINS SHORT/OPEN PROTECTION

R_ISETbelow this at startup, charger does not

initiate charge, power cycle or CE toggle to

reset

Highest resistor value considered

short

R_{ISET_SHORT}

350

2.8

Ω

R_VSETbelow this at startup, charger does

not initiate charge, power cycle or CE toggle

to reset

Highest resistor value considered

short

R_{VSET_SHORT}

kΩ

R_VSETabove this at startup, charger does

Lowest resistor value considered open not initiate charge, power cycle or CE toggle

to reset

R_{VSET_OPEN}

120

R_{CHM_TMR}below this at startup, charger

latches off, power cycle or CE toggle to

reset

Highest resistor value considered

short

R_{CHM_TMR_SHORT}

2.8

R_{CHM_TMR}above this at startup, charger

R_{CHM_TMR_OPEN}Lowest resistor value considered open latches off, power cycle or CE toggle to

reset

BATTERY CHARGER

V_DO

Dropout voltage (V_IN- V_OUT

)

VIN falling, VOUT = 4.35V, IOUT = 500mA

Tj = 25℃, all VSET settings

425

mV

%

0.5

0.8

–0.5

–0.8

OUT charge voltage regulation

accuracy

V_{REG_ACC}

%

Tj = -40℃to 125℃, all VSET settings

English Data Sheet: SLUSDK0

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6.5 Electrical Characteristics (continued)

3.0V < V_IN< 18V and V_IN> V_OUT+ V_SLEEP, T_J= -40°C to +125°C, and T_J= 25°C for typical values (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNIT

Typical charge current regulation

range

I_{CHG_RANGE}

K_ISET

V_OUT> V_{BAT_LOWV}

10

800 mA

Charge current setting factor, I_CHG

K_ISET/ R_ISET

=

10mA < ICHG < 800mA

270

300

330

AΩ

720

450

90

800

500

100

10

880 mA

550 mA

110 mA

11 mA

R_ISET= 375Ω, OUT = 3.8V or 7.6V

R_ISET= 600Ω, OUT = 3.8V or 7.6V

R_ISET= 3.0kΩ, OUT = 3.8V or 7.6V

R_ISET= 30kΩ, OUT = 3.8V or 7.6V

I_{CHG_ACC}

Charge current accuracy⁽¹⁾

9

Typical pre-charge current, as

percentage of ICHG

I_PRECHG

V_OUT< V_{BAT_LOWV}

20

%

144

85

160

100

20

176 mA

110 mA

22 mA

2.6 mA

R_ISET= 375Ω, OUT = 2.5V or 5.0V

R_ISET= 600Ω, OUT = 2.5V or 5.0V

R_ISET= 3.0kΩ, OUT = 2.5V or 5.0V

R_ISET= 30kΩ, OUT = 2.5V or 5.0V

I_{PRECHG_ACC}

Precharge current accuracy

18

1.4

2

Typical termination current, as

percentage of ICHG

I_TERM

V_OUT= V_REG

10

50

10

1

%

55 mA

11.5 mA

1.6 mA

45

8.5

0.4

R_ISET= 600Ω, OUT = VREG = 4.2V or 8.4V

R_ISET= 3.0kΩ, OUT = VREG = 4.2V or

8.4V

I_{TERM_ACC}

Termination current accuracy

R_ISET=30kΩ, OUT = VREG = 4.2V or 8.4V

Output (OUT) short circuit voltage

rising threshold, per cell for Li-Ion

chemistry

OUT rising, VSET configured for Li-Ion , 1-

cell or 2-cell

V_{BAT_SHORT}

2.1

1.1

2.2

1.2

2.3

1.3

V

Output (OUT) short circuit voltage

rising threshold, per cell for LiFePO₄

chemistry

OUT rising, VSET configured for LiFePO₄,

1-cell or 2-cell

V_{BAT_SHORT}

V

Output (OUT) short circuit voltage

hysteresis, per cell

V_{BAT_SHORT_HYS}

I_{BAT_SHORT}

OUT falling

200

16

mV

OUT short circuit charging current

Pre-charge to fast-charge transition

V_OUT< V_{BAT_SHORT}

12

20 mA

OUT rising, VSET configured for Li-Ion , 1-

V_{BAT_LOWV}

2.7

2.8

3.0

2.1

V

threshold, per cell for Li-Ion chemistry cell or 2-cell

Pre-charge to fast-charge transition

threshold, per cell for Li-FePO₄

chemistry

OUT rising, VSET configured for LiFePO₄,

1-cell or 2-cell

V_{BAT_LOWV}

1.9

2.0

V

V_{BAT_LOWV_HYS}

V_RECHG

Battery LOWV hysteresis, per cell

OUT falling, all charger configurations

100

mV

Battery recharge threshold, per cell for OUT falling, VSET configured for Li-Ion , 1-

Li-Ion chemistry cell or 2-cell, V_{REG_ACC}- VOUT

75

175

125 mV

225 mV

Battery recharge threshold, per cell for OUT falling, VSET configured for LiFePO₄,

LiFePO₄chemistry 1-cell or 2-cell, V_{REG_ACC}- VOUT

200

Battery recharge threshold, per cell for OUT falling, VSET configured for 2-cell with

NiMH chemistry

1.305

1.330

1.355

V

intermittent charge enabled

IN > 5V, T_J= 25°C

845

980

mΩ

R_ON

Charging path FET on-resistance

IN > 5V, T_J= -40°C - 125°C

1350

BATTERY CHARGER PROTECTION

V_{OUT_OVP}OUT overvoltage rising threshold

V_{OUT_OVP}

VOUT rising, as percentage of VREG

VOUT falling, as percentage of VREG

103

101

104

102

105

103

%

OUT overvoltage falling threshold

OUT overvoltage rising threshold, per

cell for NiMH chemistry

V_{OUT_OVP}

VOUT rising, TS normal

1.65

1.70

1.75

V

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6.5 Electrical Characteristics (continued)

3.0V < V_IN< 18V and V_IN> V_OUT+ V_SLEEP, T_J= -40°C to +125°C, and T_J= 25°C for typical values (unless otherwise noted)

PARAMETER

TEST CONDITIONS

VOUT falling, TS normal

IOUT rising

MIN

1.40

0.9

TYP

1.45

1

MAX UNIT

OUT overvoltage falling threshold, per

cell for NiMH chemistry

V_{OUT_OVP}

I_{OUT_OCP}

1.50

1.1

V

A

Output current limit threshold

TEMPERATURE REGULATION AND TEMPERATURE SHUTDOWN

Typical junction temperature

regulation

T_REG

125

°C

Thermal shutdown rising threshold

Thermal shutdown falling threshold

Temperature increasing

150

135

°C

T_SHUT

Temperature decreasing

BATTERY-PACK NTC MONITOR

I_{TS_BIAS}TS nominal bias current

36.5

0.99

0.83

176

208

2.3

38

1.04

0.88

188

220

2.6

39.5 µA

Cold temperature threshold

Cold temperature exit threshold

Hot temperature threshold

Hot temperature exit threshold

TS maximum voltage clamp

TS pin voltage rising (approx. 0°C)

TS pin voltage falling (approx. 4°C)

TS pin voltage falling (approx. 45°C)

TS pin voltage rising (approx. 40°C)

TS pin open-circuit (float)

1.09

0.93

V

V_COLD

200 mV

232 mV

V_HOT

V_{TS_CLAMP}

2.9

V

LOGIC INPUT PIN (/CE)

V_IH

Input high threshold level

1.3

3.3

V

V_IL

Input low threshold level

0.4

R_{PD_CE}

CE pin internal pulldown resistor

MΩ

LOGIC OUTPUT PIN (STAT1, STAT2)

V_OL

Output low threshold level

High-level leakage current

Sink current = 5mA

Pull up rail 3.3V

0.4

1

V

I_{OUT_BIAS}

µA

(1) Temperature Regulation (TREG) loop may reduce the output current depending on power dissipation and ambient temperature

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

BATTERY CHARGER

t_{OUT_OCP_DGL}

t_PRECHG

Deglitch time for I_{OUT_OCP}, IOUT rising

Pre-charge safety timer accuracy

Fast-charge safety timer accuracy

100

30

µs

min

hr

28.5

9.5

31.5

10.5

t_SAFETY

10

Automotive Intermittent charge safety timer (NiMH), as

percentage of t_SAFETY

t_INTERMITTENT

25

%

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6.7 典型特性

C_IN= 1µF，C_OUT= 1µF，V_IN= 5V，V_OUT= 3.8V（除非另有说明）

1

0.8

0.6

0.4

0.2

0

-40èC

0èC

25èC

85èC

105èC

0.8

0èC

25èC

0.6

85èC

105èC

0.4

0.2

0

-0.2

-0.4

-0.6

-0.8

-1

-0.2

-0.4

-0.6

-0.8

-1

4

6

8

10

VIN (V)

12

14

16

18

8

9

10

11

12

13

VIN (V)

14

15

16

17

18

I_OUT= 10mA

V_OUT= 4.2 V

I_OUT= 10mA

V_OUT= 8.4 V

图6-1. 线性调整率（4.2V_OUT时为1s）

图6-2. 线性调整率（8.4V_{OUT 时为2s}

）

1

0.8

0.6

0.4

0.2

0

10

8

-40èC

0èC

25èC

85èC

105èC

10mA

50mA

100mA

200mA

400mA

600mA

800mA

6

4

2

0

-0.2

-0.4

-0.6

-0.8

-1

-2

-4

-6

-8

-10

0

10

20

30

40

50

IOUT (mA)

60

70

80

90 100

3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

VOUT (V)

4

4.1

V_IN= 5V

V_OUT= 4.2 V

V_IN= 5V

温度= 25ºC

图6-3. 负载调整率（4.2V_OUT时为1s）

图6-4. ICHG 精度与V_OUT间的关系

1

0.8

0.6

0.4

0.2

0

5VIN ç 3.6VREG

5VIN ç 4.1VREG

12VIN ç 3.6VREG

12VIN ç 4.1VREG

12VIN ç 7.2VREG

12VIN ç 8.2VREG

-0.2

-0.4

-0.6

-0.8

-1

-40

-20

0

20

40

60

80

100

120

Temperature (èC)

I_OUT= 10 mA

V_IN= 5V 和12V

V_OUT= 3.8V 和7.6V

图6-6. VSET 精度与温度间的关系

图6-5. ISET 精度与温度间的关系

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6.7 典型特性(continued)

C_IN= 1µF，C_OUT= 1µF，V_IN= 5V，V_OUT= 3.8V（除非另有说明）

5.5

5

-40èC

0èC

25èC

105èC

125èC

4.5

4

3.5

3

2.5

2

1.5

1

0.5

2

4

6

8

10

VIN (V)

12

14

16

18

V_OUT=0V

CE 引脚= 高电平

图6-7. 压降电压与输出电流间的关系

图6-8. 输入关断电流与输入电压间的关系

1

2

1.8

1.6

1.4

1.2

1

-40èC

0èC

25èC

105èC

125èC

0èC

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

25èC

85èC

105èC

0.8

0.6

0.4

0.2

0

3

5

7

9

11

VIN (V)

13

15

17 18

1

2

3

4

5

VOUT (V)

6

7

8

9

10

ICHG = 0A

V_IN= 0V

CE 引脚= 低电平

图6-10. 输出静态电流与输出电压间的关系

图6-9. 输入静态电流与输入电压间的关系

V_OUT= 4.35 V

图6-11. 终止电流精度与终止电流设置间的关系

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7 Detailed Description

7.1 Overview

The BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and

LiFePO₄, in addition to 1-cell up to 6-cell NiMH battery applications. The device has a single power output that

charges the battery. The system load can be placed in parallel with the battery, as long as the average system

load does not prevent the battery from charging fully within the safety timer duration. When the system load is

placed in parallel with the battery, the input current is shared between the system and the battery.

The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-

charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.

The device charges a NiMH in constant current mode only, and terminates the charge cycle when the

programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold. An optional intermittent

charging phase can be programmed to automatically recharge a full NiMH battery once its voltage falls below

V_RECHG

.

The charger includes flexibility in programming of the fast-charge current and regulation voltage. This charger is

designed to work with a variety of input supply ranges including direct car battery connection.

The charger also comes with a full set of safety features: battery temperature monitoring, overvoltage protection,

charge safety timers, and configuration pin (VSET, ISET, CHM_TMR) short and open protection. All of these

features and more are described in detail below.

The charger is designed for a single path from the input to the output to charge the battery. Upon application of a

valid input power source, the configuration pins are checked for short/open circuit.

If the Li-Ion battery voltage is below the V_{BAT_LOWV}threshold, the battery is considered discharged and a

preconditioning cycle begins. The amount of precharge current is 20% of the programmed fast-charge current

via ISET pin. The t_PRECHGsafety timer is active, and stops charging after expiration if battery voltage fails to rise

above V_{BAT_LOWV}

.

Once the battery has charged to the V_{BAT_LOWV}threshold, Fast Charge Mode is initiated, applying the fast

charge current and starting the t_SAFETYtimer. The fast charge constant current is programmed using the ISET

pin. The constant current phase provides the bulk of the charge. Power dissipation in the IC is greatest in fast

charge with a lower battery voltage. If the IC temperature reaches T_REG, the IC enters thermal regulation, slows

the timer clock by half, and reduces the charge current as needed to keep the temperature from rising any

further. 图 7-1 shows the typical Lithium battery charging profile with thermal regulation. Under normal operating

conditions, the IC’s junction temperature is less than T_REGand thermal regulation is not entered.

Once the battery has charged to the regulation voltage, the voltage loop takes control and holds the battery at

the regulation voltage until the current tapers to the termination threshold. The termination threshold is 10% of

the programmed fast-charge current.

Further details are described in 节7.3.

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Thermal

Regulation

Phase

Current

Regulation

Phase

Voltage Regulation and

Charge Termination

Phase

Pre-

Conditioning

Phase

DONE

V

REG

I

CHG

Battery Current,

I

FAST-CHARGE

CURRENT

OUT

Battery

Voltage,

V

OUT

Charge

Complete

Status,

Charger

Off

PRE-CHARGE

CURRENT AND

TERMINATION

THRESHOLD

V

BAT_LOWV

I

TERM

I

PRECHG

T

REG

0A

Temperature, Tj

t

DONE

PRECHG

SAFETY

图7-1. Lithium-Ion Battery Charging Profile with Thermal Regulation

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7.2 Functional Block Diagram

OUT

IN

V_BAT

V_{BAT_REF}

I_CHG

V_IN

+

V_REF

V_{IN_OV}

V_SLEEPZ

V_{IN_UVLOZ}

I_{CHG_REF}

INPUT

MONITOR

+

QBLK

CNTRL

T_REG

T_J

/PG

FAULT

/CE

ISET

CEN

STAT1

STAT2

I_{CHG_REF}

V_{BAT_REF}

t_SAFETY

T_REG

PIN DETECT

&

REF DAC

STAT1,2

VSET

CHM_TMR

I_TERM

T_J

TERM

TJSHUT

TS HOT

+

I_CHG

T_SHUT

(V_{BAT_REF}

)

V_{TS_CLAMP}

I_TS

V_HOT

V_TS

- V_RECHG

RECHG

V_BAT

TS

t_CHARGE

t_SAFETY

V_TS

TMR_EXP

BATLOW

TS COLD

BATOVP

BATOCP

CHARGE

CONTROL

V_TS

V_COLD

V_{BAT_LOWV}

V_BAT

GND

V_{OUT_OVP}

V_{BAT_SHORT}

V_BAT

I_CHG

BATSHORT

FAULT

I_{OUT_OCP}

STATE

MONITOR

BQ25171-Q1

STAT1,2

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7.3 Feature Description

7.3.1 Device Power Up from Input Source

When an input source is plugged in and charge is enabled, the device checks the input source voltage to turn on

all the bias circuits. It detects and sets the input chemistry configuration, charge current and charge voltage limits

before the linear regulator is started. The power up sequence from input source is as listed:

1. ISET pin detection

2. CHM_TMR pin detection to select chemistry and charge timer

3. VSET pin detection to select charge voltage

4. Charger power up

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SHUTDOWN

POWER DOWN =

VIN crossing

below UVLO

No

POWER DOWN or

/CE Toggle

POWER DOWN or

/CE Toggle

Charge Enabled

& Power Good

Yes

STAT1 LOW

STAT2 LOW

PIN DETECT

PIN SHORT/OPEN

NON-RECOVERABLE

FAULT

NON-RECOVERABLE

FAULT

Valid Resistor

(Lithium)

Valid Resistor

(NiMH)

STAT1 LOW

STAT2 HIGH

STAT1 LOW

STAT2 HIGH

Fault Removed

RECOVERABLE

FAULT

STAT1 HIGH

STAT2 LOW

VIN OVP

TS HOT/COLD

BAT OVP

VIN OVP

TS HOT/COLD

BAT OVP

LITHIUM

BATTERY CHARGE

NIMH

BATTERY CHARGE

BAT OCP

TIMER EXP.

BAT OCP

TIMER

EXPIRED

TERMINATION

STAT1 HIGH

STAT2 HIGH

STANDBY

ENABLE

INTERMITTENT

VBAT <

VRECHG

VBAT <

VRECHG

图7-2. Simplified BQ25171-Q1 Flow Chart

7.3.1.1 ISET Pin Detection

After a valid VIN is plugged in and CE pin is pulled LOW, the device checks the resistor on the ISET pin for a

short circuit (R_ISET< R_{ISET_SHORT}). If a short condition is detected, the charger remains in the FAULT state until

the input or CE pin is toggled. If the ISET pin is open-circuit, the charger proceeds through pin detection and

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starts the charger with no charge current. This pin is monitored while charging and changes in R_ISETwhile the

charger is operating will immediately translate to changes in charge current.

An external pulldown resistor (±1% or better recommended to minimize charge current error) from ISET pin to

GND sets the charge current as:

K_ISET

I_CHG

=

R_ISET

(1)

where

• I_CHGis the desired fast-charge current

• K_ISETis a gain factor found in the electrical specifications

• R_ISETis the pulldown resistor from ISET pin to GND

For charge currents below 50 mA, an extra RC circuit is recommended on ISET to achieve more stable current

signal. For greater accuracy at lower currents, part of the current-sensing FET is disabled to give better

resolution.

7.3.1.2 CHM_TMR Pin Detection

CHM_TMR pin is used to program the device chemistry and safety timer using a ±1% pulldown resistor. The

available pulldown resistor and corresponding behaviors are:

表7-1. CHM_TMR Pin Resistor Value Table

RESISTOR

> 150 kΩ

100 kΩ

82 kΩ

CHEMISTRY

CHARGE TIMER (HR)

No charge (open-circuit)

Li+

5 hr

Li+

10 hr

Li+

Timer disable

62 kΩ

No charge (pin fault / margin)

47 kΩ

NiMH

4 hr

36 kΩ

NiMH

6 hr

27 kΩ

NiMH

8 hr

24 kΩ

NiMH

10 hr

18 kΩ

NiMH

12 hr

15 kΩ

NiMH

14 hr

11 kΩ

NiMH

16 hr

8.2 kΩ

6.2 kΩ

4.7 kΩ

3.6 kΩ

< 3.0 kΩ

NiMH

18 hr

20 hr

NiMH

22 hr

No charge (short-circuit)

If either a short- or open-circuit condition is detected, charger stops operation and remains in the FAULT state

until the input or CE pin is toggled.

Once a value has been detected, it is latched in and the pin is not continuously monitored during operation. A

change in this pin will not be acknowledged by the IC until the input supply or CE pin is toggled.

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7.3.1.3 VSET Pin Detection

VSET pin is used to program the device regulation voltage at end-of-charge using a ±1% pulldown resistor. The

available pulldown resistor and corresponding charging levels are:

表7-2. VSET Pin Resistor Value Table

Li+ CONFIGURATION

CHARGE VOLTAGE (V)

No charge (open-circuit)

1-cell LiFePO₄: 3.50 V

1-cell LiFePO₄: 3.60 V

1-cell LiFePO₄: 3.70 V

1-cell LiIon: 3.80 V

NiMH CONFIGURATION

CELL COUNT

RESISTOR

No charge (open-circuit)

1-cell

> 150 kΩ

100 kΩ

82 kΩ

62 kΩ

47 kΩ

36 kΩ

27 kΩ

24 kΩ

18 kΩ

15 kΩ

11 kΩ

1-cell + intermittent charge

2-cell

1-cell LiIon: 3.90 V

1-cell LiIon: 4.05 V

2-cell + intermittent charge

3-cell

1-cell LiIon: 4.10 V

1-cell LiIon: 4.20 V

3-cell + intermittent charge

4-cell

1-cell LiIon: 4.35 V

2-cell LiFePO₄: 7.00 V

2-cell LiFePO₄: 7.20 V

2-cell LiFePO₄: 7.40 V

2-cell LiIon: 8.20 V

4-cell + intermittent charge

5-cell

8.2 kΩ

6.2 kΩ

4.7 kΩ

3.6 kΩ

< 3.0 kΩ

5-cell + intermittent charge

6-cell

2-cell LiIon: 8.40 V

6-cell + intermittent charge

No charge (short-circuit)

If either a short- or open-circuit condition is detected, charger stops operation and remains in the FAULT state

until the input or CE pin is toggled.

Once a valid resistor value has been detected, the corresponding charge voltage is latched in and the pin is not

continuously monitored during operation. A change in this pin will not be acknowledged by the IC until the input

supply or CE pin is toggled.

7.3.1.4 Charger Power Up

After VSET, ISET and CHM_TMR pin resistor values have been validated, the device proceeds to enable the

charger. The device automatically begins operation at the correct stage of battery charging depending on the

OUT voltage.

7.3.2 Battery Charging Features

When charge is enabled , the device automatically completes a charging cycle according to the settings on

VSET, ISET and CHM_TMR pins without any intervention. The lithium-based charging cycle is automatically

terminated when the charging current is below termination threshold, charge voltage is above recharge

threshold, and device is not in thermal regulation (TREG). When a full battery is discharged below the recharge

threshold (V_RECHG), the device automatically starts a new charging cycle. After charge is done, toggling the input

supply or the CE pin can initiate a new charging cycle.

7.3.2.1 Lithium-Ion Battery Charging Profile

The device charges a lithium based battery in four phases: trickle charge, precharge, constant current and

constant voltage. At the beginning of a charging cycle, the device checks the battery voltage and regulates

current and voltage accordingly.

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If the charger is in thermal regulation during charging, the actual charging current will be less than the

programmed value. In this case, termination is temporarily disabled and the charging safety timer is counted at

half the clock rate. For more information, refer to 节7.3.2.3.

Regulation Voltage

VSET

V_RECHG

Battery Voltage

Charge Current

ISET

Charge Current

V_{BAT_LOWV}

V_{BAT_SHORT}

IPRECHG = ISET x 20%

ITERM = ISET x 10%

I_{BAT_SHORT}

Trickle Charge

Pre-charge

Re-

charge

Fast-Charge

CC

Taper-Charge

CV

Charge

Done

Precharge Timer

(30min)

Safety Timer

CHM_TMR

图7-3. Lithium-Based Battery Charging Profile

7.3.2.1.1 NiMH Battery Charging Profile

The device charges a NiMH battery in two phases: constant current and intermittent charge (optional). The

duration for constant current charing is controlled by the charge timer, which is programmed using the

CHM_TMR pin. Intermittent charging is designed to replenish the natural self-discharge of NiMH by restarting a

short charge cycle (25% of programmed charge timer) when the output voltage falls below V_RECHGthreshold. If

the intermittent charging function is disabled, the device will charge a battery once, and not start a recharge

cycle automatically. In this case, a new charge cycle can be initiated by toggling the input supply or the CE pin.

Before initiating a NiMH charge cycle, the device checks for a full battery. If battery voltage is above V_RECHG, the

battery is considered full and the device does not charge. Once the battery voltage falls below V_RECHG, the

device automatically begins charging. If the intermittent charging function is disabled, a single charge cycle is

initiated with the charge timer as programmed by CHM_TMR pin. If intermittent charging is enabled, an

intermittent charge cycle is initiated with charge timer as 25% of CHM_TMR programmed value.

If the charger is in thermal regulation during charging, the actual charging current will be less than the

programmed value. For NiMH charging, termination by timer is still enabled, but the charging safety timer is

counted at half the clock rate. For more information, refer to 节7.3.2.3.

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OUT Over-voltage

V_{OUT_OVP}

Battery Voltage

Charge Current

ISET

Charge Current

Constant

Timer Expire

Current CC

(Charge Done)

Charge Timer

CHM_TMR

图7-4. NiMH Battery Charging Profile with Intermittent Charging Disabled

OUT Over-voltage

V_{OUT_OVP}

Battery Voltage

V_RECHG

Charge Current

ISET

Charge Current

Constant

Current CC

Charge

Done

Intermittent

Charge

Charge Timer

CHM_TMR

25% x TMR

图7-5. NiMH Battery Charging Profile with Intermittent Charging Enabled

7.3.2.2 Charge Termination and Battery Recharge

When configured as a lithium battery charger, the device terminates a charge cycle when the OUT pin voltage is

above the recharge threshold (V_RECHG), and the current is below the termination threshold (I_TERM). Termination is

temporarily disabled when the charger device is in thermal regulation. After charge termination is detected, the

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linear regulator turns off and the device enters STANDBY state. Once the OUT pin drops below the V_RECHG

threshold, a new charge cycle is automatically initiated.

When configured as NiMH battery charger, the device terminates a charge cycle when the charge safety timer

expires. If intermittent charging is enabled, a new charge cycle with 25% of original programmed timer duration

will start once the battery voltage falls below V_RECHG. For example, after a 20 hour charge cycle finishes, and

then the battery falls below V_RECHG, the device recharges the battery for 5 hours: (t_INTERMITTENT= 25% x

t_SAFETY). If intermittent charging is disabled, the device will not start a new charge cycle automatically based on

the V_RECHGthreshold. A toggle on the input supply or the CE pin is required to restart a charge cycle in this

case.

7.3.2.3 Charging Safety Timers

The device has built-in safety timers to prevent an extended charging cycle due to abnormal battery conditions.

The precharge timer is fixed at 30 minutes. The user can program or disable the fast charge safety timer through

the CHM_TMR pin. When safety timer expires, the charge cycle ends. A toggle on the input supply or CE pin is

required to restart a charge cycle after the safety timer has expired.

During thermal regulation, the safety timer counts at half clock rate as the actual charge current is likely to be

below the ISET setting. For example, if the charger is in thermal regulation throughout the whole charging cycle,

and the safety timer is 10 hours, then the timer will expire in 20 hours.

During faults which disable charging, such as VIN OVP, BAT OVP, TSHUT or TS faults, the timer is suspended.

Once the fault goes away, charging and the safety timer resumes. If the charging cycle is stopped and started

again, the timer gets reset (toggle CE pin restarts the timer).

The safety timer restarts counting for the following events:

1. Charging cycle stop and restart (toggle CE pin, charged battery falls below recharge threshold, or toggle

input supply)

2. OUT pin voltage crosses the V_{BAT_LOWV}threshold in either direction

The precharge safety timer (fixed counter that runs when V_OUT< V_{BAT_LOWV}), follows the same rules as the fast-

charge safety timer in terms of getting suspended, reset, and counting at half-rate.

7.3.2.4 Battery Cold, Hot Temperature Qualification (TS Pin)

While charging, the device continuously monitors battery temperature by sensing the voltage at the TS pin. A

negative temperature coefficient (NTC) thermistor should be connected between the TS and GND pins

(recommend: 103AT-2). If temperature sensing is not required in the application, connect a fixed 10-kΩ resistor

from TS to GND to allow normal operation. Battery charging is allowed when the TS pin voltage falls between

V_COLDand V_HOTthresholds (typically 0°C – 45°C). The temperature corresponding to these voltage thresholds

can be modified by adding resistors in parallel and in series with the thermistor, as shown in 图 7-6. If the TS pin

indicates battery temperature is outside this range, the device stops charging, enters the STANDBY state, and

sets the STAT pins to STAT1 = LOW , STAT2 = HIGH to indicate a recoverable fault. Once battery temperature

returns to normal conditions, charging resumes automatically.

V_{TS_CLAMP}

I_{TS_BIAS}

TS

R_S

R_P

R_TH

图7-6. TS Resistor Network For Modified Temperature Charging Window

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表7-3. Recommended Resistor Values for Different Temperature Charging Windows

TEMPERATURE CHARGING WINDOW

R_S

R_P

0°C to 60°C

−10°C to 60°C

−10°C to 50°C

1.9 kΩ

2.3 kΩ

1.1 kΩ

400 kΩ

70 kΩ

7.3.3 Status Outputs (STAT1, STAT2)

7.3.3.1 Charging Status Indicator (STAT1, STAT2)

The device indicates the charging state on the open-drain STAT1, STAT2 pin. This pin can drive an LED.

表7-4. STAT1 and STAT2 Pin States

CHARGING STATE

STAT1 PIN STATE

STAT2 PIN STATE

Charge completed, charger in sleep mode or charge disabled (including V_OUT

V_RECHGafter TMR_EXP for NiMH charging)

>

HIGH

Normal charge in progress (including intermittent charge active for NiMH, and

automatic recharge for Li+ charger)

HIGH

LOW

HIGH

Recoverable fault (VIN OVP, BAT OVP, TS HOT, TS COLD, TSHUT)

Non-recoverable or latch-off fault (VSET/CHM_TMR/ISET pin short/open, BAT

OCP, TMR_EXP for Li+ charging, V_OUT< V_RECHGafter TMR_EXP for NiMH

charging)

LOW

Safety timer expiration event (TMR_EXP) is addressed differently depending on whether the charger is

configured as a NiMH or Li+ charger. For Lithium-based charging, TMR_EXP is reported as a non-recoverable

fault by setting STAT1 = LOW and STAT2 = LOW. For NiMH-based charging, TMR_EXP with VOUT > V_RECHGis

the expected termination method, and shall be reported as charge complete with STAT1 = HIGH and STAT2 =

HIGH. For NiMH-based charging, TMR_EXP with VOUT < V_RECHGis a non-recoverable fault and shall be

reported by setting STAT1 = LOW and STAT2 = LOW. An input supply or CE pin toggle is required to attempt

charging after a non-recoverable fault is detected.

7.3.4 Protection Features

The device closely monitors input and output voltage, as well as internal FET current and temperature for safe

linear regulator operation.

7.3.4.1 Input Overvoltage Protection (VIN OVP)

If the voltage at IN pin exceeds V_{IN_OV}, the device turns off after a deglitch, t_{VIN_OV_DGL}. The safety timer

suspends count and device enters STANDBY mode. Once the IN voltage recovers to normal level, the charge

cycle and the safety timer automatically resume operation.

7.3.4.2 Output Overvoltage Protection (BAT OVP)

If the voltage at OUT pin exceeds V_{OUT_OVP}, the device immediately stops charging. The safety timer suspends

count and device enters STANDBY mode. Once the OUT voltage recovers to normal level, the charge cycle and

the safety timer resume operation.

7.3.4.3 Output Overcurrent Protection (BAT OCP)

During normal operation, the OUT current should be regulated to ISET programmed value. However, if a short

circuit occurs on ISET pin, the OUT current may rise to unintended level. If the current at OUT pin exceeds

I_{OUT_OCP}, the device turns off after a deglitch, t_{OUT_OCP_DGL}. The safety timer resets the count, and device

remains latched off. An input supply or CE pin toggle is required to restart operation.

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I_{OUT_OCP}

ICHG

t_{OUT_OCP_DGL}

R_ISET

Short Circuit

event on ISET

Charger

latched off

图7-7. Overcurrent Protection

7.3.4.4 Thermal Regulation and Thermal Shutdown (TREG and TSHUT)

The device monitors its internal junction temperature (T_J) to avoid overheating and to limit the IC surface

temperature. When the internal junction temperature exceeds the thermal regulation limit, the device

automatically reduces the charge current to maintain the junction temperature at the thermal regulation limit

(TREG). During thermal regulation, the actual charging current is usually below the programmed value on the

ISET pin. Therefore, the termination comparator for the Lithium-Ion battery is disabled, and the safety timer runs

at half the clock rate.

Additionally, the device has thermal shutdown to turn off the linear regulator when the IC junction temperature

exceeds the TSHUT threshold. A recoverable fault is signaled via the status pins (STAT1 = LOW, STAT2 =

HIGH). The charger resumes operation when the IC die temperature decreases below the TSHUT falling

threshold.

1000

800

600

400

200

5Vin, 3.8Vout

9Vin, 7.6Vout

12Vin, 7.6Vout

0

-40

-20

0

20

40

60

80

100

120

T

_AMB°(C)

图7-8. Typical Charge Current Capability vs Ambient Temperature

7.4 Device Functional Modes

7.4.1 Shutdown or Undervoltage Lockout (UVLO)

The device is in shutdown state if the IN pin voltage is less than V_{IN_LOWV}, or the CE pin is HIGH. The internal

circuitry is powered down, all the pins are high impedance, and the device draws I_{SD_IN}from the input supply.

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Once the IN voltage rises above the V_{IN_LOW}threshold and the CE pin is LOW, the IC will enter Sleep Mode or

Active Mode depending on the OUT pin voltage.

7.4.2 Sleep Mode

The device is in Sleep Mode when V_{IN_LOWV}< V_IN< V_OUT+ V_SLEEPZ. The device waits for the input voltage to

rise above V_OUT+ V_SLEEPZto start operation.

7.4.3 Active Mode

The device is powered up and charges the battery when the CE pin is LOW and the IN voltage ramps above

both V_{IN_LOWV}, and V_OUT+ V_SLEEPZ. The device draws I_{Q_IN}from the supply to bias the internal circuitry. For

details on device power-up sequence, refer to 节7.3.1.

7.4.3.1 Standby Mode

The device is in Standby Mode if a valid input supply is present and charge is terminated or if a recoverable fault

is detected. The internal circuitry is partially biased, and the device continues to monitor for either VOUT to drop

below V_RECHG, or the recoverable fault to be removed.

7.4.4 Fault Mode

The fault conditions are categorized into recoverable and nonrecoverable as follows:

• Recoverable(STAT1 = LOW, STAT2 = HIGH), from which the device should automatically recover once the

fault condition is removed:

– VIN OVP

– BAT OVP

– TS HOT

– TS COLD

• Nonrecoverable(STAT1 = LOW, STAT2 = HIGH), requiring CE pin or input supply toggle to resume operation:

– BAT OCP

– ISET pin short detected

– VSET pin short/open detected

– CHM_TMR pin short/open detected

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8 Application and Implementation

备注

以下应用部分中的信息不属于TI 器件规格的范围，TI 不担保其准确性和完整性。TI 的客户应负责确定

器件是否适用于其应用。客户应验证并测试其设计，以确保系统功能。

8.1 Application Information

A typical application consists of the device configured as a standalone battery charger for Lithium-Ion, Li-

Polymer, LiFePO₄, or NiMH batteries. The battery charge profile and the safety charge timer are configured

using a pulldown resistor on the CHM_TMR pin. The charge voltage and the number of cells are configured

using a pulldown resistor on the VSET pin. Charge current is configured using a pulldown resistor on the ISET

pin. A battery thermistor may be connected to the TS pin to allow the device to monitor battery temperature and

control charging. Pulling the CE pin high disables the charging function. Charger status is reported via the

STAT1 and STAT2 status pins.

8.2 Typical Applications

8.2.1 1s LiFePO₄Charger Design Example

V_IN

IN

OUT

1s LiFePO4

System

Load

1µF

10k

100k

82k

CHM_TMR

VSET

STAT1

STAT2

TS

10k NTC

600

ISET

GND

/CE

HOST

BQ25171-Q1

图8-1. BQ25171-Q1 Typical Application for 1s LiFePO₄Charging at 500 mA

8.2.1.1 Design Requirements

• Supply voltage = 5 V

• Battery is single-cell LiFePO₄

• Fast charge current: I_CHG= 500 mA

• Charge voltage: V_REG= 3.6 V

• Charge safety timer: t_SAFETY: 5 hr

• Termination ucrrent: I_TERM= 10% of I_CHGor 50 mA

• Precharge current: I_PRECHG= 20% of I_CHGor 100 mA

• TS –Battery temperature sense = 10-kΩNTC (103AT)

• CE is an open drain control pin

8.2.1.2 Detailed Design Procedure

• The regulation voltage is set via the VSET pin to 3.6 V, the input voltage is 5 V, and the charge current is

programmed via the ISET pin to 500 mA.

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• The charging chemistry and safety timer are set to LiFePO₄and 5 hr, respectively, via the CHM_TMR pin.

8.2.1.2.1 Program the Fast Charge Current, ISET:

R_ISET= [K_ISET/ I_CHG

]

from electrical characteristics table. . . K_ISET= 300 AΩ

R_ISET= [300 AΩ/0.5 A] = 600 Ω

Selecting the closest 1% resistor standard value, use a 604-Ω resistor between ISET and GND, for an expected

I_CHGof 497 mA.

8.2.1.2.2 TS Function

Use a 10-kΩ NTC thermistor in the battery pack (recommend: 103AT-2). The V_COLDand V_HOTthresholds in the

data sheet are designed to meet a charging window between 0°C and 45°C for a 10-kΩNTC with β= 3435 K.

To disable the TS sense function, use a fixed 10-kΩresistor between the TS and GND pins.

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8.2.1.3 Application Curves

C_IN= 1 µF, C_OUT= 1 µF, V_IN= 5 V, V_OUT= 3.8 V, I_CHG= 250 mA (unless otherwise specified)

OUT = open-circuit

R_ISET= 1.2 kΩ

图8-2. Power Up with Battery (1-cell Li-Ion)

图8-3. Power Up without Battery

VIN = 5 V →0 V

CE = High →Low

图8-4. Power Down

图8-5. Charge Enable

CE = Low →High

图8-7. IN OVP Response

图8-6. Charge Disable

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V_OUT= VSET = 4.2 V

V_IN= 5 V →9 V

I_SYS= 0 mA →500 mA

图8-8. IN Transient Response

图8-9. OUT Transient Response

V_OUT= VSET = 4.2 V →0 V

I_SET= 1.2 kΩ→0 Ω

图8-10. OUT Short-Circuit Response

图8-11. ISET Short-Circuit Response

ISET = 50 mA →500 mA

图8-13. TS Change Response

图8-12. ISET Change Response

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8.2.2 2s Li-Ion Charger with Power Path Design Example

System

Load

V_IN

IN

OUT

2s Li-Ion

V_REF

10k

100k

CHM_TMR

VSET

STAT1

STAT2

TS

4.7k

3k

ISET

GND

/CE

HOST

BQ25171-Q1

图8-14. BQ25171-Q1 Typical Application for 2s LiIon Charging at 100 mA

8.2.2.1 Design Requirements

The design requirements include the following:

• Input supply up to 18 V

• Battery is 2-cell Li-Ion

• Fast charge current: I_CHG= 100 mA

• Charge voltage: V_REG= 8.2 V

• Charge safety timer: t_SAFETY: 5 hr

• Termination current: I_TERM= 10% of I_CHGor 10 mA

• Precharge current: I_PRECHG= 20% of I_CHGor 20 mA

• TS –Battery temperature sense = 10-kΩNTC (103AT)

– Charging allowed between battery temperatures of 0ºC to 45ºC

• CE is a control pin, pull high to disable the charger

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8.2.3 4s NiMH Charger Design Example

V_IN

IN

OUT

4s NiMH

System

Load

V_REF

1µF

10k

8.2k

11k

10k

CHM_TMR

VSET

STAT1

STAT2

TS

ISET

1.9k

400k

HOST

GND

/CE

BQ25171-Q1

图8-15. BQ25171-Q1 Typical Application for 4s NiMH with Intermittent Charging Enabled

8.2.3.1 Design Requirements

The design requirements include the following:

• Input supply up to 18 V

• Battery is 4-cell NiMH

• Fast charge current: I_CHG= 30 mA

• Recharge voltage for intermittent cycles: V_RECHG= 1.33V x 4 = 5.32 V

• Charge safety timer: t_SAFETY: 16 hr

• TS –Battery temperature sense = 10-kΩNTC (103AT-2)

– R_S= 1.9 kΩand R_P= 400 kΩadded to modify battery charging temperature window to: 0ºC to 60ºC

• CE is a control pin, pull high to disable the charger

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9 Power Supply Recommendations

The device is designed to operate from an input voltage supply range between 3.0 V and 18 V (up to 40 V

tolerant) and current capability of at least the maximum designed charge current. If located more than a few

inches from the IN and GND pins, a larger capacitor is recommended.

10 Layout

10.1 Layout Guidelines

To obtain optimal performance, the decoupling capacitor from IN to GND and the output filter capacitor from OUT

to GND should be placed as close as possible to the device, with short trace runs to both IN, OUT and GND.

• All low-current GND connections should be kept separate from the high-current charge or discharge paths

from the battery. Use a single-point ground technique incorporating both the small signal ground path and the

power ground path.

• The high current charge paths into IN pin and from the OUT pin must be sized appropriately for the maximum

charge current in order to avoid voltage drops in these traces.

10.2 Layout Example

TS

IN

GND

OUT

VREF

STAT2

STAT1

VSET

CHM_

TMR

图10-1. BQ25171-Q1 Board Layout Example

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11 Device and Documentation Support

11.1 Device Support

11.1.1 第三方产品免责声明

TI 发布的与第三方产品或服务有关的信息，不能构成与此类产品或服务或保修的适用性有关的认可，不能构成此

类产品或服务单独或与任何TI 产品或服务一起的表示或认可。

11.2 Receiving Notification of Documentation Updates

To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper

right corner, click on Alert me to register and receive a weekly digest of any product information that has

changed. For change details, review the revision history included in any revised document.

11.3 支持资源

TI E2E^™支持论坛是工程师的重要参考资料，可直接从专家获得快速、经过验证的解答和设计帮助。搜索现有解

答或提出自己的问题可获得所需的快速设计帮助。

链接的内容由各个贡献者“按原样”提供。这些内容并不构成 TI 技术规范，并且不一定反映 TI 的观点；请参阅

TI 的《使用条款》。

11.4 Trademarks

TI E2E^™is a trademark of Texas Instruments.

所有商标均为其各自所有者的财产。

11.5 静电放电警告

静电放电(ESD) 会损坏这个集成电路。德州仪器(TI) 建议通过适当的预防措施处理所有集成电路。如果不遵守正确的处理

和安装程序，可能会损坏集成电路。

ESD 的损坏小至导致微小的性能降级，大至整个器件故障。精密的集成电路可能更容易受到损坏，这是因为非常细微的参

数更改都可能会导致器件与其发布的规格不相符。

11.6 术语表

TI 术语表

本术语表列出并解释了术语、首字母缩略词和定义。

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12 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

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重要声明和免责声明

TI 提供技术和可靠性数据（包括数据表）、设计资源（包括参考设计）、应用或其他设计建议、网络工具、安全信息和其他资源，不保证没

有瑕疵且不做出任何明示或暗示的担保，包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担保。

这些资源可供使用TI 产品进行设计的熟练开发人员使用。您将自行承担以下全部责任：(1) 针对您的应用选择合适的TI 产品，(2) 设计、验

证并测试您的应用，(3) 确保您的应用满足相应标准以及任何其他安全、安保或其他要求。这些资源如有变更，恕不另行通知。TI 授权您仅可

将这些资源用于研发本资源所述的TI 产品的应用。严禁对这些资源进行其他复制或展示。您无权使用任何其他TI 知识产权或任何第三方知

识产权。您应全额赔偿因在这些资源的使用中对TI 及其代表造成的任何索赔、损害、成本、损失和债务，TI 对此概不负责。

TI 提供的产品受TI 的销售条款(https:www.ti.com/legal/termsofsale.html) 或ti.com 上其他适用条款/TI 产品随附的其他适用条款的约束。TI

提供这些资源并不会扩展或以其他方式更改TI 针对TI 产品发布的适用的担保或担保免责声明。重要声明

邮寄地址：Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

重要声明和免责声明

TI“按原样”提供技术和可靠性数据（包括数据表）、设计资源（包括参考设计）、应用或其他设计建议、网络工具、安全信息和其他资源，

不保证没有瑕疵且不做出任何明示或暗示的担保，包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担

保。

这些资源可供使用 TI 产品进行设计的熟练开发人员使用。您将自行承担以下全部责任：(1) 针对您的应用选择合适的 TI 产品，(2) 设计、验

证并测试您的应用，(3) 确保您的应用满足相应标准以及任何其他功能安全、信息安全、监管或其他要求。

这些资源如有变更，恕不另行通知。TI 授权您仅可将这些资源用于研发本资源所述的 TI 产品的应用。严禁对这些资源进行其他复制或展示。

您无权使用任何其他 TI 知识产权或任何第三方知识产权。您应全额赔偿因在这些资源的使用中对 TI 及其代表造成的任何索赔、损害、成

本、损失和债务，TI 对此概不负责。

TI 提供的产品受 TI 的销售条款或 ti.com 上其他适用条款/TI 产品随附的其他适用条款的约束。TI 提供这些资源并不会扩展或以其他方式更改

TI 针对 TI 产品发布的适用的担保或担保免责声明。

TI 反对并拒绝您可能提出的任何其他或不同的条款。IMPORTANT NOTICE

邮寄地址：Texas Instruments, Post Office Box 655303, Dallas, Texas 75265


型号：	BQ25171QWDRCRQ1
厂家：	TEXAS INSTRUMENTS
描述：	适用于 1-2 节锂离子、磷酸铁锂和 1-6 节镍氢电池的汽车类 800mA 线性电池充电器 \| DRC \| 10 \| -40 to 125 电池
文件：	总34页 (文件大小：1952K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

BQ25171QWDRCRQ1 [TI]

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