BQ29410 datasheet(5/13 Pages) TI

Part #	BQ29410

Description	VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES (2nd-LEVEL PROTECTION)

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Manufacturer	TI [Texas Instruments]

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VC1

VC2

VC4

VC3

GND

VDD

OUT

CD

1.2V(TYP)

RVD

CVD

ICD =0.2 A(TYP)

CIN

RIN

CIN

C

(DELAY)

OVERVOLTAGE PROTECTION

DELAY TIME CALCULATION

t

d +

1.2 V

C

(DELAY)

I

CD

C

(DELAY) +

t

d

I

CD

1.2 V

bq29410, bq29411, bq29412

bq29413, bq29414, bq29415

SLUS669D – AUGUST 2005 – REVISED OCTOBER 2006

FUNCTIONAL BLOCK DIAGRAM

When one of the cell voltages exceeds V(PROTECT), an internal current source begins to charge the capacitor,

C(DELAY), connected to the CD pin. If the voltage at the CD pin, VCD, reaches 1.2 V, the OUT pin is activated and

transitions high. An externally connected NCH FET is activiated and blows the external fuse in the positive

battery rail; see the functional block diagram.

If all cell voltages fall below V(PROTECT) before the voltage at pin CD reaches 1.2 V, the delay time does not run

out. An internal switch clamps the CD pin to GND and discharges the capacitor, C(DELAY), and secures the full

delay time for the next occurring overvoltage event.

Once the pin OUT is activated, it transitions back from high to low after all battery cells reach V(PROTECT)– Vhys.

The delay time is calculated as follows:

Where I(CD) = CD current source = 0.18 µA

5

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