L1:2.2 PH

PGND1

SW1

SGND

PGND2

L2:2.2 PH

SW2

SDA

LM3370

4.7 PF

2.7V to 5.5V

4.7 PF

2.7V to 5.5V

FB2

EN2

EN1

FB1

10 PF

10 PF

SCL

nPOR1

nPOR2

*

4.7 PF

LM3370

www.ti.com

SNVS406N – NOVEMBER 2005 – REVISED MAY 2013

LM3370 Dual Synchronous Step-Down DC-DC Converter

with Dynamic Voltage Scaling Function

Check for Samples: LM3370

1

FEATURES

APPLICATIONS

2

•

•

Baseband Processors

–

•

Application Processors (Video, Audio)

–

•

I/O Power

–

Automatic PFM/PWM Mode Switching and

•

FPGA Power and CPLD

Forced PWM Mode for Low Noise Operation

DESCRIPTION

–

The LM3370 is a dual step-down DC-DC converter

•

600mA Load Per Channel

optimized for powering ultra-low voltage circuits from

•

2MHz PWM Fixed Switching Frequency (Typ.)

a single Li-Ion battery and input rail ranging from 2.7V

•

The Bucks Operate 180° Out-of-Phase Timing

to 5.5V. It provides two outputs with 600mA load per

channel. The output voltage range varies from 1V to

Offset for Noise and Input Surge Current

Abatement

compatible interface. This dynamic voltage scaling

•

Internal Synchronous Rectification for High

function allows processors to achieve maximum

Efficiency

•

Internal Soft Start

compatible interface can also be used to control auto

PFM-PWM/PWM

mode

selection

and

other

•

Power-on-Reset Function for Both Outputs

performance enhancing features.

•

2.7V

The

LM3370

offers

superior

features

and

•

Operates from a Single Li-Ion Cell or 3 Cell

performance for portable systems with complex

NiMH/NiCd Batteries and 3.3V/5.5V Fixed Rails

power

management

requirements.

Automatic

•

2.2µH Inductor, 4.7µF Input and 10µF Output

intelligent switching between PWM low-noise and

Capacitor Per Channel

PFM

low-current

mode

offers

improved

system

•

16-lead WSON Package (4 mm x 5 mm x 0.8

efficiency.

Internal

synchronous

rectification

enhances the converter efficiency without the use of

mm)

further external devices.

•

20-Bump DSBGA Package (3.0 mm x 2.0 mm x

0.6 mm)

Typical Application Circuit

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 © 2005–2013, 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.