LM3203

2.7V to 5.5V

0.8V to 3.6V

L1

3.3 PH

C1

10 PF

C5

0.1 PF

C2

4.7 PF

SW

FB

PGND

SGND

10 pF

267k

BYPOUT

R1

R2

133k

C3

BYP

EN

0.267V to 1.20V

LM3203

www.ti.com

SNVS355D – MAY 2005 – REVISED APRIL 2013

LM3203 Step-Down DC-DC Converter with Bypass Mode for CDMA / WCDMA RF Power

Amplifiers

Check for Samples: LM3203

1

FEATURES

DESCRIPTION

The LM3203 is a DC-DC converter optimized for

2

•

2MHz (Typ.) PWM Switching Frequency

powering RF power amplifiers (PAs) from a single

•

Operates from a Single Li-Ion Cell (2.7V to

Lithium-Ion cell. However, they may be used in many

5.5V)

other applications. It steps down an input voltage of

•

Adjustable Output Voltage (0.8V to 3.6V)

2.7V to 5.5V to an adjustable output voltage of 0.8V

•

500mA Maximum Load Capability (PWM and

analog

input

and

external

resistor

dividers

for

Bypass Mode)

optimizing efficiency of the RF PA at various power

•

PWM / Forced Bypass Mode

levels.

•

The LM3203 offers 3 modes for mobile phones and

•

similar RF PA applications. Fixed-frequency PWM

150mA)

mode minimizes RF interference. Bypass mode turns

on an internal bypass switch to power the PA directly

•

Fast Turn-On Time When Enabled (50µs typ.),

from the battery. Shutdown mode turns the device off

3GPP Compliant

and reduces battery consumption to 0.1µA (typ.).

•

10-Pin DSBGA Package

The LM3203 is available in a 10-pin lead free DSBGA

•

Current Overload Protection

package. A high switching frequency (2MHz) allows

•

Thermal Overload Protection

use of tiny surface-mount components.

APPLICATIONS

•

Cellular Phones

•

Hand-Held Radios

•

RF PC Cards

•

Battery Powered RF Devices

TYPICAL APPLICATION

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.