LM3203

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SNVS355C – MAY 2005 – REVISED JULY 2005

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

Amplifiers

Check for Samples: LM3203

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FEATURES

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Fast Turn-on time when Enabled (50µs typ.),

3GPP Compliant

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2MHz (typ.) PWM Switching Frequency

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10-pin micro SMD Package

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Operates from a single Li-Ion cell (2.7V to

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Current Overload Protection

5.5V)

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Thermal Overload Protection

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Adjustable Output Voltage (0.8V to 3.6V)

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500mA Maximum load capability (PWM and

APPLICATIONS

Bypass mode)

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Cellular Phones

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PWM / Forced Bypass Mode

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Hand-Held Radios

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RF PC Cards

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150mA)

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Battery Powered RF Devices

DESCRIPTION

The LM3203 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion

cell. However, they may be used in many other applications. It steps down an input voltage of 2.7V to 5.5V to an

resistor dividers for optimizing efficiency of the RF PA at various power levels.

The LM3203 offers 3 modes for mobile phones and similar RF PA applications. Fixed-frequency PWM mode

minimizes RF interference. Bypass mode turns on an internal bypass switch to power the PA directly from the

battery. Shutdown mode turns the device off and reduces battery consumption to 0.1µA (typ.).

The LM3203 is available in a 10-pin lead free micro SMD package. A high switching frequency (2MHz) allows

use of tiny surface-mount components.

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

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All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, 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.