1 Features

1• Small VSSOP8 Package (Half the Footprint of

Standard 8-Pin SOIC Package)

• 1.09-mm Package Height

• Up to 2-MHz Switching Frequency

• 1.2-V to 14-V Input Voltage

• 1.24-V to 14-V Adjustable Output Voltage

• Up to 1A Load Current

• 0.17-Ω Internal MOSFET

• Up to 90% Regulator Efficiency

• 80-μA Typical Operating Current

• < 2.5-μA Specified Supply Current In Shutdown

2 Applications

• PDAs, Cellular Phones

• 2-Cell and 3-Cell Battery-Operated Equipment

• PCMCIA Cards, Memory Cards

• Flash Memory Programming

• TFT/LCD Applications

• 3.3-V to 5.0-V Conversion

• GPS Devices

• Two-Way Pagers

• Palmtop Computers

• Hand-Held Instruments

3 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

1.2 V and 14 V and converts it into a regulated output

voltage. The output voltage can be adjusted between

1.24 V and 14 V. 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 2 MHz) 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 80 μA because of

the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5 μA.

The LM2621 is available in a VSSOP-8 package.

This package uses half the board area of a standard

8-pin SOIC and has a height of just 1.09 mm.