AN137 Silicon_Laboratories, AN137 Datasheet

AN137

Manufacturer Part Number

AN137

Description

Lithium ION Battery Charger Using C8051f300

Manufacturer

Silicon_Laboratories

Datasheet

1.AN137.pdf (36 pages)

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Relevant Devices

This application note applies to the following devices:

C8051F300

I n t r o d u c t i o n

Driven by the need for untethered mobility and

ease of use, many systems rely on rechargable bat-

teries as their primary power source. The battery

charging circuitry for these systems is typically

implemented using a fixed-function IC to control

the charging current/voltage profile.

The C8051F30x family provides a flexible alterna-

tive to fixed-function battery chargers. This appli-

cation note discusses how to use the C8051F30x

family in Li-Ion battery charger applications. The

Li-Ion charging algorithms can be easily adapted to

other battery chemistries, but an understanding of

other battery chemistries is required to ensure

proper charging for those chemistries.

Rev. 1.2 12/03

I T H I U M

O N

Figure 1. Lithium Ion Battery Charge Block Diagram.

V Pos (+)

V Neg (-)

A T T E R Y

LED

Sense Resistor

Integrated

8051F30x

Products

Cygnal

LDO

H A R G E R

AIN

PWM Out

Precision Time Base

8k FLASH, PWM,

K ey P oin ts

•

Temp Sensor,

Converter

Buck

On-chip high-speed, 8-bit ADC provides supe-

rior accuracy in monitoring charge voltage

(critical to prevent overcharging in Li-Ion

applications), maximizing charge effectiveness

and battery life.

On-chip PWM provides means to implement

buck converter with a very small external

inductor.

On-chip Temp sensor provides an accurate and

stable drive voltage for determining battery

temperature. An external RTD (resistive tem-

perature device) can also be used via the flexi-

ble analog input AMUX.

A single C8051F30x platform provides full

product range for multi-chemistry chargers,

expediting time to market and reducing inven-

tory.

S I N G

Resistor

Divider

C8051F300

Li-Ion

Cells

AN137

AN137-DS12

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