LM22676 General Description

The LM22676 series of regulators are monolithic integrated circuits which provide all of the active functions for a stepdown (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version. The SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external

components and National’s WEBENCH ® design tool. National’s WEBENCH ® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The LM22676 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 μA quiescent current standby condition.

LM22676 Features

■ Wide input voltage range: 4.5V to 42V

■ Internally compensated voltage mode control

■ Stable with low ESR ceramic capacitors

■ 120 mΩ N-channel MOSFET TO-263 THIN package

■ 100 mΩ N-channel MOSFET PSOP-8 package

■ Output voltage options:

-ADJ (outputs as low as 1.285V)

-5.0 (output fixed to 5V)

■ ±1.5% feedback reference accuracy

■ Switching frequency of 500 kHz

■ -40°C to 125°C operating junction temperature range

■ Precision enable pin

■ Integrated boot diode

■ Integrated soft-start

■ Fully WEBENCH ® enabled

■ Step-down and inverting buck-boost applications

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