BQ24123 datasheet(3/36 Pages) TI

Part #	BQ24123

Description	SINGLE-CHIP SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH ENHANCED EMI PERFORMANCE(bqSWITCHER??

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Manufacturer	TI [Texas Instruments]

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ELECTRICAL CHARACTERISTICS

V

IREG +

1V

RSET1

1000,

V

IREG*PRE +

0.1V

RSET2

1000,

bq24120

bq24123

bq24125

SLUS688E – MARCH 2006 – REVISED DECEMBER 2007

TJ = 0°C to 125°C and recommended supply voltage range (unless otherwise stated)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT CURRENTS

VCC > VCC(min), PWM switching

10

mA

IVCC(VCC)

VCC supply current

VCC > VCC(min), PWM NOT switching

5

VCC > VCC(min), CE = HIGH

315

µA

0

°C ≤ T

J ≤ 65°C, VI(BAT) = 4.2 V,

3.5

VCC < V(SLP) or VCC > V(SLP) but not in charge

Battery discharge sleep current, (SNS,

0

°C ≤ T

J ≤ 65°C, VI(BAT) = 8.4 V,

I(SLP)

5.5

µA

BAT, OUT pins)

VCC < V(SLP) or VCC > V(SLP) but not in charge

0

°C ≤ T

J ≤ 65°C, VI(BAT) = 12.6 V,

7.7

VCC < V(SLP) or VCC > V(SLP) but not in charge

VOLTAGE REGULATION

CELLS = Low, in voltage regulation

4.2

Output voltage, bq24123

VOREG

CELLS = High, in voltage regulation

8.4

V

Output voltage, bq24120

Operating in voltage regulation

4.2

Feedback regulation REF for bq24125 only

VIBAT

IIBAT = 25 nA typical into pin

2.1

(W/FB)

TA = 25°C

–0.5%

0.5%

Voltage regulation accuracy

–1%

1%

CURRENT REGULATION - FAST CHARGE

VLOWV ≤ VI(BAT) < VOREG,

IOCHARGE

Output current range of converter

150

2000

mA

V(VCC) - VI(BAT) > V(DO-MAX)

100 mV

≤ VIREG≤ 200 mV,

(1)

VIREG

Voltage regulated across R(SNS) Accuracy

–10%

10%

Programmed Where

5 k

Ω ≤ RSET1 ≤ 10 kΩ, Select RSET1 to

program VIREG,

VIREG(measured) = IOCHARGE ×RSNS

(–10% to 10% excludes errors due to RSET1

and R(SNS) tolerances)

V(LOWV) ≤ VI(BAT) ≤ VO(REG),

V(ISET1)

Output current set voltage

1

V

V(VCC) ≥ VI(BAT) + V (DO-MAX)

VLOWV ≤ VI(BAT) < VO(REG) ,

K(ISET1)

Output current set factor

1000

V/A

V(VCC) ≥ VI(BAT) + V(DO-MAX)

PRECHARGE AND SHORT-CIRCUIT CURRENT REGULATION

Precharge to fast-charge transition voltage

VLOWV

68

71.4

75

%VO(REG)

threshold, BAT

Deglitch time for precharge to fast charge

Rising voltage;

t

20

30

40

ms

transition

tRISE, tFALL = 100 ns, 2-mV overdrive

IOPRECHG

Precharge range

VI(BAT) < VLOWV, t < tPRECHG

15

200

mA

V(ISET2)

Precharge set voltage, ISET2

VI(BAT) < VLOWV, t < tPRECHG

100

mV

K(ISET2)

Precharge current set factor

1000

V/A

10 mV

≤ VIREG-PRE ≤ 100 mV,

(1)

VIREG-PRE

Voltage regulated across RSNS-Accuracy

–20%

20%

Where

1.0 k

Ω ≤ RSET2 ≤ 10 kΩ, Select RSET2

to program VIREG-PRE,

VIREG-PRE (Measured) = IOPRE-CHG × RSNS

(–20% to 20% excludes errors due to RSET2

and RSNS tolerances)

CHARGE TERMINATION (CURRENT TAPER) DETECTION

ITERM

Charge current termination detection range

VI(BAT) > VOREG- VRCH

15

200

mA

(1)

Inductor peak current should be less than 2.6 A. Use equations 12, 13, 15, 18, and 19 to make sure the peak inductor current is less

than 2.6 A.

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Product Folder Link(s): bq24120 bq24123 bq24125

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