MC33348 데이터 시트보기 (PDF) - Motorola => Freescale

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MC33348

Lithium Battery Protection Circuit for One Cell Battery Packs

Motorola => Freescale 

MC33348

Figure 7. One Cell Smart Battery Pack

10

5.1 k

CI

MC33348

Cell

7 VCC 0.1

Voltage

1

Cell Voltage

Sample

Cell

Switch

Ground

R1

Over/Under

Cell Voltage

Detector

R2

&

Reference

R3

3

Test

2.0 k

2

Ck

Oscillator

Ck

En

Over/Under

Data Latch

&

Control Logic

Discharge

Overcurrent

Detector

Sense

Enable

Charge Pump

Charge/Discharge

Gate Drivers

Charge Pump

Output

CO

0.01

8 Discharge

Gate Drive

Output

Discharge

Switch Q2

4 Charge 6 5 Charge

Gate Drive

Gate Drive

Output

Charge

Switch

Q1

Common/

Discharge

Current Limit

1.0 M

Components CI is mandatory. Refer to the Battery Pack Application text.

PIN FUNCTION DESCRIPTION

Pin

Symbol

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1 CellVoltage

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2 Test

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3 Ground

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4 DischargeGateDrive

Output

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5 ChargeGateDrive

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Common/Discharge

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Current Limit

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 6 ChargeGateDrive

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Output

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 7 VCC

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 8 ChargePumpOutput

Description

This input is connected to the positive terminal of the cell for voltage monitoring. Internally, the Cell

Voltage Sample Switch applies this voltage to a resistor divider where it is compared by the Cell Voltage

Detector to an internal reference.

This pin is normally not connected and is used in testing the protection IC. An active low at this input

resets the internal logic and turns on both MOSFET switches. Upon release, the logic becomes active and

the cell voltage is sampled within 1.0 ms.

This is the protection IC ground and all voltage ratings are with respect to this pin.

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

discharging.

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

path for charge switch Q1. A discharge current limit fault is set when the battery pack load causes the

combined voltage drop of charge switch Q1 and discharge switch Q2 to exceed the discharge current limit

threshold voltage, Vth(dschg), with respect to Pin 3.

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

charging.

This pin is the positive supply voltage for the protection IC.

This is the charge pump output. A reservoir capacitor is connected from this pin to ground.

6

MOTOROLA ANALOG IC DEVICE DATA

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