FB

EN

VIN

VCON

SW

2.7V to 5.5V

0.6V to 3.4V

10 PF

4.7 PF

GND

0.47 PH

LM3241

LM3241

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SNOSB38B – JANUARY 2009 – REVISED APRIL 2013

LM3241 6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power

Amplifiers

Check for Samples: LM3241

1

FEATURES

DESCRIPTION

The LM3241 is a DC-DC converter optimized for

2

•

6MHz (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

•

Adjustable Output Voltage (0.6V to 3.4V)

from 2.7V to 5.5V to an adjustable output voltage

from 0.6V to 3.4V. Output voltage is set using a

•

750 mA Maximum Load Capability

VCON analog input for controlling power levels and

•

efficiency of the RF PA.

500 mA)

The LM3241 offers three modes of operation. In

•

Automatic ECO/PWM mode change

PWM mode the device operates at a fixed frequency

•

6-bump DSBGA Package

of 6MHz (typ.) which minimizes RF interference when

driving medium-to-heavy loads. At light load, the

•

Current Overload Protection

device enters into ECO mode automatically and

•

Thermal Overload Protection

operates with reduced switching frequency. In ECO

•

Soft Start Function

mode, the quiescent current is reduced and extends

•

the battery life. Shutdown mode turns the device off

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

6.3V of rated-voltage ceramic capacitor

•

Small Chip Inductor in 0805 (2012) case size

The LM3241 is available in a 6-bump lead-free

DSBGA package. A high-switching frequency (6MHz)

allows use of tiny surface-mount components. Only

APPLICATIONS

three small external surface-mount components, an

•

Battery-Powered 3G/4G Power Amplifiers

inductor and two ceramic capacitors are required.

•

Hand-Held Radios

•

RF PC Cards

•

Battery-Powered RF Devices

TYPICAL APPLICATION

1

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

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, 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.