LM22670TJEADJ National Semiconductor, LM22670TJEADJ Datasheet

LM22670TJEADJ

Manufacturer Part Number

LM22670TJEADJ

Description

TO-263

Manufacturer

National Semiconductor

Datasheet

1.LM22670TJEADJ.pdf (18 pages)

Specifications of LM22670TJEADJ

Date_code

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LM22670

3A SIMPLE SWITCHER®, Step-Down Voltage Regulator

with Synchronization or Adjustable Switching Frequency

General Description

The LM22670 series of regulators are monolithic integrated

circuits which provide all of the active functions for a step-

down (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

use complete design using a minimum number of external

components and National’s WEBENCH

National’s WEBENCH

nal component calculation, electrical simulation, thermal sim-

ulation, and Build-It boards for easy design-in. The switching

clock frequency is provided by an internal fixed frequency os-

cillator which operates at 500 kHz. The switching frequency

can also be adjusted with an external resistor or synchronized

to an external clock up to 1MHz. It is also possible to self-

synchronize multiple regulators to share the same switching

frequency. The LM22670 series also has built in thermal shut-

down, current limiting and an enable control input that can

power down the regulator to a low 25 µA quiescent current

standby condition.

Simplified Application Schematic

tool includes features such as exter-

concept provides for an easy to

300760

design tool.

Features

■

Package

■

Applications

■

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:

±1.5% feedback reference accuracy

Switching frequency of 500 kHz, adjustable between 200

kHz and 1 MHz

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

Precision enable pin

Integrated boot diode

Integrated soft-start

Fully WEBENCH

Step-down and inverting buck-boost applications

PSOP-8 (Exposed Pad)

TO-263 THIN (Exposed Pad)

Industrial Control

Telecom and Datacom Systems

Embedded Systems

Automotive Telematics and Body Electronics

Conversions from Standard 24V, 12V and 5V Input Rails

-ADJ (outputs as low as 1.285V)

-5.0 (output fixed to 5V)

enabled

30076001

October 17, 2008

www.national.com

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