V

OV

V

HYS

OUT (V)

t

DELAY

–

bq294602, bq294604

www.ti.com

SLUSAS0B – DECEMBER 2011 – REVISED MARCH 2012

PIN FUNCTIONS

bq2946xy

Pin Name

Type I/O

Description

1

NC

—

No Connection

2

V1

IA

Sense input for positive voltage of the cell

Electrically connected to IC ground and negative terminal of the

3

VSS

P

cell

Electrically connected to IC ground and negative terminal of the

4

VSS

P

cell

5

VDD

P

Power supply

6

OUT

OA

Output drive for external N-Channel FET

VSS pin to be connected to the PWRPAD on the printed circuit

Thermal Pad

PWRPAD

—

board for proper operation

PIN DETAILS

Description

The method of overvoltage detection is comparing the cell voltage to an overvoltage protection threshold voltage

transitioned to a high level. This output (OUT) is released to a low condition if the cell input (V1) is below the

Figure 1. Timing for Overvoltage Sensing

Sense Positive Input for V1

This is an input to sense single battery cell voltage. A series resistor and a capacitor across the cell is required

for noise filtering and stable voltage monitoring.

Output Drive, OUT

The gate of an external N-Channel MOSFET is connected to this terminal. This output transitions to a high level

when an overvoltage condition is detected and after the programmed delay timer. The out will reset to a low level

Supply Input, VDD

This terminal is the unregulated input power source for the IC. A series resistor is connected to limit the current,

and a capacitor is connected to ground for noise filtering.

Thermal Pad, PWRPAD

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Product Folder Link(s): bq294602 bq294604