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MC33349N-5

Lithium battery protection circuit for one cell battery packs

Motorola => Freescale 

MC33349

PIN FUNCTION DESCRIPTION

Pin

Symbol

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1

DO

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2

P–

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3

CO

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4

Ct

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5

Vcell

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 6

Gnd

Description

This output connects to the gate of discharge MOSFET switch Q2 allowing it to enable or disable battery pack

discharging.

This is a multifunction pin that is used to monitor cell charge and discharge current and to provide a gate turn–off

path for charge switch Q1. A current limit fault is set when the combined voltage drop of charge switch Q1 and

discharge switch Q2 exceeds the discharge current limit threshold voltage, Vth(dschg) above Pin 6 caused by a

load; or charge current limit threshold voltage, Vth(chg) below Pin 6 caused by a charger.

This output connects to the gate of charge MOSFET switch Q1 allowing it to enable or disable battery pack

charging.

An external capacitor connects between this pin and ground (Pin 6) to set the sample timer frequency and

overvoltage delay time.

This input connects to the positive terminal of the cell for voltage monitoring and provides operating bias for the

integrated circuit. Internally, the Cell Voltage Sample Switch periodically applies this voltage to a resistor divider

where it is compared by the Cell Voltage Detector to an internal reference.

This is the ground pin of the IC.

4

MOTOROLA ANALOG IC DEVICE DATA

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