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LM2788 120mA High Efficiency Step-Down Switched Capacitor Voltage Converter

October 2002

LM2788

120mA High Efficiency Step-Down Switched Capacitor

Voltage Converter

General Description

The LM2788 switched capacitor step-down DC/DC con-

verter efficiently produces a 120mA regulated low-voltage

rail from a 2.6V to 5.5V input. Fixed output voltage options of

1.5V, 1.8V, and 2.0V are available. The LM2788 uses mul-

tiple fractional gain configurations to maximize conversion

efficiency over the entire input voltage and output current

ranges. Also contributing to high overall efficiency is the

extremely low supply current of the LM2788: 32碌A operating

unloaded and 0.1碌A in shutdown.

The optimal external component requirements of the

LM2788 solution minimize size and cost, making the part

ideal for Li-Ion and other battery powered designs. Two 1碌F

flying capacitors and two 10碌F bypass capacitors are all that

are required, and no inductors are needed.

The LM2788 also features noise-reducing soft-start circuitry,

short-circuit protection and over-temperature protection.

Features

n

Output voltage options:

2.0V

鹵

5%, 1.8V

鹵

5%, 1.5V

鹵

6%

n

120mA output current capability

n

Multi-Gain and Gain Hopping for Highest Possible

Efficiency - up to 90% Efficient

n

2.6V to 5.5V input range

n

Low operating supply current: 32碌A

n

Shutdown supply current: 0.1碌A

n

Thermal and short circuit protection

n

Available in an 8-Pin MSOP Package

Applications

n

n

n

n

n

Cellular Phones

Pagers

H/PC and P/PC Devices

Portable Electronic Equipment

Handheld Instrumentation

Typical Application Circuit

20044401

漏 2002 National Semiconductor Corporation

DS200444

www.national.com

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