LM2773

EN

Capacitors: 1 PF - C1005 (0402), X5R, 6.3V

4.7 PF - C1608 (0603), X5R, 6.3V

or equivalent

5.5V

C1

1 PF

1 PF

4.7 PF

C1+

C1-

GND

C2

1 PF

C2+

C2-

SEL

LM2773

www.ti.com

SNVS554A – JANUARY 2008 – REVISED MAY 2013

LM2773 Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator

Check for Samples: LM2773

1

FEATURES

DESCRIPTION

The LM2773 is a switched capacitor step-down

2

•

Low-Noise Spread Spectrum Operation

regulator that produces a selectable 1.8V or 1.6V

•

1.8V/1.6V Selectable Output Voltage

output. It is capable of supplying loads up to 300mA.

•

2% Output Voltage Regulation

The LM2773 operates with an input voltage from 2.5V

to 5.5V, accommodating 1-cell Li-Ion batteries and

•

> 75% Efficiency in 1.8V Mode

chargers.

•

Very Low Output Ripple: 10mV @ 300mA

The LM2773 utilizes a regulated charge pump with

•

Output Currents up to 300mA

gains of 2/3x and 1x. It has very low ripple and noise

•

2.5V to 5.5V Input Voltage Range

on both the input and output due to its pre-regulated

•

1.15MHz (typ.) switching frequency and spread

spectrum operation. When output currents are low,

•

1.15MHz Switching Frequency

the LM2773 automatically switches to a low-ripple

•

No Inductors…Small Solution Size

PFM regulation mode to maintain high efficiency over

•

Short Circuit and Thermal Protection

the entire load range.

•

0.5mm pitch, DSBGA-9 (1.511 × 1.511mm ×

The LM2773 is available in TI's 0.5mm pitch 9-bump

0.6mm)

DSBGA.

APPLICATIONS

•

Power Supply for DSP's, Memory, and

Microprocessors

•

Mobile Phones and Pagers

•

Digital Cameras, Portable Music Players, and

Other Portable Electronic Devices

Typical Application Circuit

Figure 1.

Figure 2. LM2773 Efficiency vs.

Low-Dropout Linear Regulator (LDO) Efficiency

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

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

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, 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.