LM2772

EN

Capacitors: 1 µF - TDK C1005X5R0J105K

4.7 µF - TDK C1608X5R0J475K

or equivalent

C1

1 µF

1 µF

4.7 µF

High: ON

Low: Shutdown

C1+

C1-

GND

C2

1 µF

C2+

C2-

C3

1 µF

C3+

C3-

LM2772

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SNVS486A – DECEMBER 2006 – REVISED MARCH 2007

LM2772 Low-Ripple Switched Capacitor Step-Down Regulator

Check for Samples: LM2772

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FEATURES

•

No Inductors…Small Solution Size

•

Short Circuit and Thermal Protection

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•

Low-Noise Fixed Frequency Operation

•

SON-10 Package (3mm × 3mm × 0.8mm)

•

1.2V Output Voltage

•

3% Output Voltage Regulation

APPLICATIONS

•

Li-Ion (3.6V) to 1.2V with 80% Efficiency

•

DSP, Memory, and Microprocessor Power

•

Very Low Output Ripple: 8mV @ 150mA

Supplies

•

Output Currents up to 150mA

•

Mobile Phones and Pagers

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2.7V to 5.5V Input Voltage Range

•

Portable Electronic Devices

•

•

1.1MHz Switching Frequency

DESCRIPTION

The LM2772 is a switched capacitor step-down regulator that produces a 1.2V output. It is capable of supplying

loads up to 150mA with 3% output voltage regulation over line, load, and temperature. The LM2772 operates

with an input voltage from 3.0V to 5.5V, accommodating 1-cell Li-Ion batteries and chargers.

The LM2772 utilizes a highly efficient regulated multi-gain charge pump. Pre-regulated 1.1MHz fixed-frequency

switching results in very low ripple and noise on both the input and the output. When output currents are low, the

part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load

range.

The LM2772 is available in National’s 10-pad Leadless Leadframe No-Pullback Package (SON-10).

Typical Application Circuit

Figure 1. LM2772 Efficiency vs.

Low-Dropout Linear Regulator (LDO) Efficiency

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.