LM2621

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SNVS033C – MAY 2004 – REVISED MARCH 2005

Typical Performance Characteristics (continued)

Switching Frequency

vs

Peak Inductor Current vs

Load Current

Maximum Load Current vs

Input Voltage

Detailed Description

OPERATING PRINCIPLE

The LM2621 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage

systems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal

limit, and voltage reference in a single 8-pin MSOP package Figure 2. The switching DC-DC regulator boosts an

input voltage between 1.2V and 14V to a regulated output voltage between 1.24V and 14V. The LM2621 starts

from a low 1.1V input and remains operational down to 0.65V.

This device is optimized for use in cellular phones and other applications requiring a small size, low profile, as

well as low quiescent current for maximum battery life during stand-by and shutdown. A high-efficiency gated-

oscillator topology offers an output of up to 1A.

Additional features include a built-in peak switch current limit, and thermal protection circuitry.

Copyright © 2004–2005, Texas Instruments Incorporated

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