FB

EN

SW

2.7V to 5.5V

0.8V to 3.6V

10 PF

4.7 PF

SGND

PGND

3.3 PH

LM3208

LM3208

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SNVS404B – APRIL 2006 – REVISED MARCH 2013

LM3208 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power

Amplifiers

Check for Samples: LM3208

1

FEATURES

DESCRIPTION

The LM3208 is a DC-DC converter optimized for

2

•

2 MHz (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, it may be used in many

5.5V)

other applications. It steps down an input voltage in

•

Adjustable Output Voltage (0.8V to 3.6V)

the range from 2.7V to 5.5V to an adjustable output

voltage of 0.8V to 3.6V. Output voltage is set by

•

Fast Output Voltage Transient (0.8V to 3.4V in

25µs typ.)

efficiency of the RF PA.

•

650mA Maximum Load Capability

The LM3208 offers superior performance for mobile

•

phones and similar RF PA applications. Fixed-

400mA)

frequency PWM operation minimizes RF interference.

•

8-pin DSBGA Package

A shutdown function turns the device off and reduces

battery consumption to 0.01 µA (typ.).

•

Current Overload Protection

•

Thermal Overload Protection

The LM3208 is available in an 8-pin lead-free DSBGA

package. A high switching frequency (2 MHz typ.)

allows use of tiny surface-mount components. Only

APPLICATIONS

three small external surface-mount components, an

•

Cellular Phones

inductor and two ceramic capacitors, are required.

•

Hand-Held Radios

•

RF PC Cards

•

Battery Powered RF Devices

TYPICAL APPLICATION

Figure 1. LM3208 Typical Application

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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 © 2006–2013, 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.