bq76925

SLUSAM9B

– JULY 2011 – REVISED DECEMBER 2011

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Current Sense Amplifier

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

I_GAIN = 0

4

Measured from SENSEN,

Current sense amplifier gain

SENSEP to VIOUT

I_GAIN = 1

8

Measured from SENSEN,

Current sense amp input range

–125

375

mV

SENSEP to VSS

REF_SEL = 0

0.25

1.25

V

Current sense amp output range

Measured at VIOUT

REF_SEL = 1

0.5

2.5

V

REF_SEL = 0

1.0

V

Measured at VIOUT

Zero current output

SENSEP = SENSEN

REF_SEL = 1

2.0

V

Current amplifier accuracy

–1%

1%

10

µA

(1)

Max DC load for specified accuracy

Over Current Comparator

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

5

V

Measured from SENSEP to comparator

Comparator amplifier gain

1

input

25

400

mV

–6

6

mV

Current comparator accuracy

–10%

10%

V

ALERT Output Low Logic

0.4

V

NA

NA

NA

ALERT Pulldown current

ALERT = 0.4 V, Output driving low

1

mA

ALERT Leakage current

ALERT = 5.0 V, Output high-Z

< 1

μA

Comparator response time

100

µs

(1)

The Over Current Comparator is not guaranteed to work when VBAT is below this voltage.

(2)

Trip threshold selectable from 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375 or 400 mV

(3)

This parameter NA because output is open drain.

Internal Temperature Measurement

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

Internal temperature voltage

1.15

1.2

1.25

V

Internal temperature voltage sensitivity

–4.4

mV /

ºC

Cell Balancing and Open Cell Detection

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

1

3

5

VCn = 3.6 V

Ω

3

5.5

8

VCn = 3.6 V

(1)

Balancing current is not internally limited. The cell balancing operation is completely controlled by the Host processor, no automatic

function or time-out is included in the part. Care must be used to ensure that balancing current through the part is below the maximum

power dissipation limit. The Host algorithm is responsible for limiting thermal dissipation to package ratings.

8

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© 2011, Texas Instruments Incorporated

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