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SC806

Miniature High Current

Lithium-Ion Battery Charger

POWER MANAGEMENT

August 10, 2005

Description

Features

Applications

Typical Application Circuit

Fully integrated charger with FET pass transistor,

reverse-blocking diode, sense resistor and thermal

protection

High Accuracy Charge Current*

Tiny 3mm x 3mm 10 lead MLP package

Programmable precharge, fastcharge and termina-

tion current

Battery voltage controlled to 1% accuracy

Battery Charge Current accurate to 5% at 800mA

Soft-start for step load and adapter plug-in

Up to 1A continuous charge current

Input voltage range from 3V to 6V allows seamless

charging from current limited adapter

0.1µA battery drain current in shutdown and

monitor modes

Over current protection in all charging modes

Automatic loss of battery detection

Adapter Present, Charge Status, and No Battery

output LED drivers

*Patent Pending

Cellular phones

PDAs

Handheld meters

Charging stations

USB chargers

Digital cameras

GPS Handhelds

Programmable current source

The SC806 is a fully integrated, single cell, constant-cur-

rent (cc)/constant-voltage (cv) Lithium-Ion battery charger

in a tiny 3x3 mm thermally enhanced MLP package. The

SC806 can operate as a stand-alone charger or in con-

junction with a Power Management Controller (PMIC).

The SC806 has a pre-charge function for trickle charging

deeply discharged batteries. The fast charge current is

enabled automatically when the battery voltage reaches

the required threshold. When the battery reaches the

constant voltage or CV portion of the charge curve the

SC806 switches to CV regulation mode. In this mode

the output current decays until the termination current is

reached. At this point the SC806 signals the charge cycle

is complete and turns off the output and enters the moni-

tor mode. If the battery voltage drops by 100mV from

the CV voltage a new charge cycle will begin.

The SC806 can also function as a general purpose cur-

rent source or as a current source for charging Nickel-

Cadmium (NiCd) and Nickel-Metal-Hydride (NiMH) batter-

ies.

R2

1k

BATTERY

D2

LED

R3

3.01k

NOBAT Indicator

R1

1k

C2

2.2uF

Charging

Indicator

R4

3.01k

SC806 Typical Application Circuit

NTC Voltage

Adapter

Present

Indicator

C1

.1uF

D1

LED

SC806

3

7

2

4

5

10

1

8

9

6

VCC

DIS

CPB

IPRGM

ITERM

CHRGB

VOUT

NOBAT

NTC

GND

CHARGER VIN