BQ29400ADCT3 datasheet(4/10 Pages) TI

Part #	BQ29400ADCT3

Description	VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Lion BATTERIES

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Manufacturer	TI [Texas Instruments]

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CIN

RIN

VC1

VC2

VC3

VC4

GND

1.2 V (TYP)

CD

VDD

OUT

ICD = 0.18 µA (TYP)

CVD

CDELAY

RVD

OVERVOLTAGE PROTECTION

DELAY TIME CALCULATION

t

d +

1.2 V

C

(DELAY)

I

CD

C

(DELAY) +

t

d

I

CD

1.2 V

bq29400, bq29400A

bq29401, bq29405

SLUS568B – JULY 2003 – REVISED NOVEMBER 2004

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 Figure 1.

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

4

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