BQ24730RGFT4 datasheet(6/37 Pages) TI

Part #	BQ24730RGFT4

Description	ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

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Manufacturer	TI [Texas Instruments]

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bq24730

SLUS695 – MARCH 2006

ELECTRICAL CHARACTERISTICS (continued)

8 Vdc

≤ V

(VCC) ≤ 24 Vdc, 0°C ≤ TJ ≤ 125°C, all voltages with respect to AGND (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT CURRENT SENSE AMPLIFIER - IADAPT AMPLIFIER

ACP, ACN Common-mode input

0

24

V

voltage range

V(IADAPT)

V(IADAPT) = V(ACP, ACN)× G(IADAPT)

IADAPT output voltage range

0

3.5

V

V(SRP) > 2.5 V or V(SRP) > V(IADAPT) + 1 V

G(IADAPT)

Voltage gain

G(IADAPT) = V(IADAPT)/ V(ACP, ACN)

20

V/V

V(ACP) – V(ACN) = 40 mV

–2%

2%

(4 A with 10 m

Ω)

Adapter current sense amplifier

V(BAT) > 2.5 V or V(BAT) >

V(ACP) – V(ACN) = 20 mV

–3%

3%

output voltageaccuracy

V(IADAPT) + V(DO-MAX)(1)

(2 A with 10 m

Ω)

V(ACP) – V(ACN) = 5 mV

–25%

25%

(0.5 A with 10 m

Ω)

I(ADAPT_LIM)

IADAPT output current limit

IADAPT shorted to AGND

4.5

mA

OPERATING CONDITIONS

V(VCC), V(PVCC), input voltage operating

Selector and charger operational.

8

24

V

range

QUIESCENT CURRENT – NO ADAPTER CONNECTED

I(VCC,PVCC)

VCC and PVCC quiescent current

I(VCC,PVCC) = ( I(VCC) + I(PVCC) ) at V(VCC) = V(PVCC) = 16.8 V

254

µA

I(ACP,ACN)

ACP and ACN quiescent current

I(ACP,ACN) = ( I(ACP) + I(ACN) ) at V(ACP) = V(ACN) = V(VCC) = V(PVCC) = 16.8 V

1

µA

I(BAT)

BAT quiescent current

I(BAT) at V(BAT) = V(VCC) = V(PVCC) = 16.8 V

17

µA

I(SRP,SRN)

SRP and SRN quiescent current

I(SRP,SRN) = ( I(SRP) + I(SRN) ) at V(SRP) = V(SRN) = V(VCC) = V(PVCC) = 16.8 V

1

µA

I(SYNN,SYNP)

SYNN and SYNP quiescent current

I(SYNN,SYNP) = ( I(SYNN) + I(SYNP) ) at V(SYNP) = V(SYNN) = V(VCC) = V(PVCC) = 16.8 V

1

µA

I(SYS)

SYS quiescent current

I(SYS) at V(SYS) = V(VCC) = V(PVCC) = 16.8 V

25

µA

I(PH)

PH quiescent current

I(PH) at V(PH) = V(VCC) = V(PVCC) = 16.8 V

1

µA

I(BTST)

BTST quiescent current

I(BTST) at V(BTST) = V(VCC) = V(PVCC) = 16.8 V

1

µA

QUIESCENT CURRENT – ADAPTER CONNECTED AND READY TO CHARGE

VCC and PVCC quiescent current,

I(VCC,PVCC) = (I(VCC) + I(PVCC) at V(VCC) = V(PVCC) = 16.8 V, charger off (CHGEN =

I(VCC,PVCC)

4.45

mA

while converter is not switching

HI) = DISABLED

I(VCC_SW) = I(VCC)

FPWM = 300 kHz, charger on (CHGEN = LO) = ENABLED

VCC Current while converter is

I(VCC_SW)

Q(G) at HIDRV = Q(G) at LODRV = 30 nC, [No Load on VREF5]

25

mA

switching including gate drive current

Gate drive switching current = Q(G)× FPWM = (30 nC + 30 nC) × 300kHz = 18

mA

5-V REFERENCE LDO VOLTAGE AND AC DETECTION STATUS (VREF5, TURNS ON WHEN AIRDET DETECTED)

Adapter detected (VACDET >V(ACD)), VCC> 7 V

VVREF5

5V Regulator output voltage

4.75

5

5.25

V

0

→ 10 mA, source current

Adapter not detected, (VACDET< V(ACD))

VVREF5_SAT

Saturation voltage when VREF5 is off

0.15

V

0

→– 10 mA, ac adapter inserted, C

O = 1 µF, discharge load

IVREF5_LIM

Short-circuit current

V(VREF5) = AGND

20

mA

UNDERVOLTAGE LOCKOUT CIRCUIT

Undervoltage lockout threshold

VREF5 rising, POR mode set at VREF5 < V(UVLO)

3.7

V

UVLO

V(UVLO) hysteresis

VREF5 falling

100

mV

CONTROL LOGIC INPUTS (CHGEN, CELLS, IADSPL)

VIL

Input low threshold level

2.7 V < V(pull-up) < 5.5 V

0.8

V

VIH

Input high threshold level

2.7 V < V(pull-up) < 5.5 V

2.1

V

Ilkg

Leakage current

Pin V = 5.5 V

1

µA

OPEN DRAIN OUTPUT (ACGOOD, STAT, LOWBAT, DPMDET)

V(OL_sat)

Output saturation voltage

I = 5 mA

0.5

V

Ilkg

Leakage current

V(PULL-UP) = 5 V

1

µA

CHARGE OVERCURRENT COMPARATOR

V(OLP)

Overcurrent protection threshold

V(SRP-SRN) rising

190

%I(REG_CHG)

V(OLPH)

Hysteresis

V(SRP-SRN) falling

20

%I(REG_CHG)

CHARGE UNDERCURRENT THRESHOLD (SYNCHRONOUS to NONSYNCHRONOUS CURRENT)

V(ISYNSET)

ISYNSET voltage

1

V

G(ISYNSET)

ISYNSET gain

500

V/A

THERMAL SHUTDOWN

T(SHUT)

Thermal shutdown threshold

TJ rising, Charge disabled at TJ > T(SHUT)

145

°C

T(SHUTH)

Hysteresis

TJ falling, Charge enabled at TJ < T(SHUT)– T(SHUTH)

15

°C

Deglitch time, thermal shutdown

TJ rising/falling

8

ms

6

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