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SA57608YD

One-cell Lithium-ion battery protection with over/undercharge and overcurrent protection

Philips Electronics 

Philips Semiconductors

One-cell Lithium-ion battery protection with

over/undercharge and overcurrent protection

GENERAL DESCRIPTION

The SA57608 is a single-cell Li-ion protection IC, and is an improved

version of the NE57600, with different pinout. Its over and under

voltage accuracies are trimmed to within ± 25 mV (5%) over the

entire battery pack operating temperature range. The SA57608 is

available in various over and undervoltage limits.

There is a discharge overcurrent protection circuit which can protect

the battery pack against an accidental short-circuit. The overcharge

trip point has a time delay which can be programmed externally. It is

packaged in a space-saving 6-lead small outline package and

requires two external N-channel MOSFETs and a minimum of

passive parts.

FEATURES

• Trimmed overvoltage trip point to within ±25 mV

• Programmable overvoltage trip time delay

• Trimmed undervoltage trip point to within ±25 mV

• Very Low undervoltage quiescent sleep current 0.05 mA

• Discharge overcurrent cutoff

• Low operating current (10 mA)

• 6-lead small outline package (SOP004)

APPLICATIONS

• Cellular phones

• Personal digital assistants

• Palmtop computers

SIMPLIFIED SYSTEM DIAGRAM

V+

100 Ω

VCC 5

Li-ION CELL

0.1 µF

0.01 µF

CDLY 4

SA57608

VM

2

GND 6

DF 1

CF 3

0.1 µF

DISCHARGE

FET

CHARGE

FET

Figure 1. Simplified system diagram.

1 kΩ

V–

SL01568

Product data

SA57608

2003 Oct 29

2

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