LM2621

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SNVS033C – MAY 2004 – REVISED MARCH 2005

LM2621 Low Input Voltage, Step-Up DC-DC Converter

Check for Samples: LM2621

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FEATURES

APPLICATIONS

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Small Mini-SO8 Package (Half the Footprint of

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PDAs, Cellular Phones

Standard 8-Pin SO Package)

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2-Cell and 3-Cell Battery-Operated Equipment

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1.09 mm Package Height

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PCMCIA Cards, Memory Cards

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Up to 2 MHz Switching Frequency

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Flash Memory Programming

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1.2V to 14V Input Voltage

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TFT/LCD Applications

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1.24V - 14V Adjustable Output Voltage

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3.3V to 5.0V Conversion

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Up to 1A Load Current

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GPS Devices

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0.17

Ω Internal MOSFET

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Two-Way Pagers

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Up to 90% Regulator Efficiency

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Palmtop Computers

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80 µA Typical Operating Current

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Hand-Held Instruments

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<2.5µA Guaranteed Supply Current In

Shutdown

DESCRIPTION

The LM2621 is a high efficiency, step-up DC-DC switching regulator for battery-powered and low input voltage

systems. It accepts an input voltage between 1.2V and 14V and converts it into a regulated output voltage. The

output voltage can be adjusted between 1.24V and 14V. It has an internal 0.17

Ω N-Channel MOSFET power

switch. Efficiencies up to 90% are achievable using the LM2621.

The high switching frequency (adjustable up to 2MHz) of the LM2621 allows for tiny surface mount inductors and

capacitors. Because of the unique constant-duty-cycle gated oscillator topology very high efficiencies are realized

over a wide load range. The supply current is reduced to 80µA because of the BiCMOS process technology. In

the shutdown mode, the supply current is less than 2.5µA.

The LM2621 is available in a Mini-SO-8 package. This package uses half the board area of a standard 8-pin SO

and has a height of just 1.09 mm.

Typical Application Circuit

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

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PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2005, 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.