LM2670SX-3.3 National Semiconductor, LM2670SX-3.3 Datasheet

LM2670SX-3.3

Manufacturer Part Number

LM2670SX-3.3

Description

Manufacturer

National Semiconductor

Datasheet

1.LM2670SD-ADJ.pdf (26 pages)

Specifications of LM2670SX-3.3

Case

TO-263-7

Date_code

09+

Current page: 1 of 26
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LM2670

SIMPLE SWITCHER

Voltage Regulator with Sync

General Description

The LM2670 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 (

ON-resistance DMOS power switch. The series consists of

fixed output voltages of 3.3V, 5V and 12V and an adjustable

output version.

The SIMPLE SWITCHER concept provides for a complete

design using a minimum number of external components.

The switching clock frequency can be provided by an inter-

nal fixed frequency oscillator (260KHz) or from an externally

provided clock in the range of 280KHz to 400Khz which

allows the use of physically smaller sized components. A

family of standard inductors for use with the LM2670 are

available from several manufacturers to greatly simplify the

design process. The external Sync clock provides direct and

precise control of the output ripple frequency for consistent

filtering or frequency spectrum positioning.

The LM2670 series also has built in thermal shutdown,

current limiting and an ON/OFF control input that can power

down the regulator to a low 50µA quiescent current standby

condition. The output voltage is guaranteed to a

ance.

Typical Application

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

90%) is obtained through the use of a low

DS100942

High Efficiency 3A Step-Down

2% toler-

Features

n Efficiency up to 94%

n Simple and easy to design with (using off-the-shelf

n 150 mΩ DMOS output switch

n 3.3V, 5V and 12V fixed output and adjustable (1.2V to

n 50µA standby current when switched OFF

n Wide input voltage range: 8V to 40V

n External Sync clock capability (280KHz to 400KHz)

n 260 KHz fixed frequency internal oscillator

n −40 to +125˚C operating junction temperature range

Applications

n Simple to design, high efficiency (

n Efficient system pre-regulator for linear voltage

n Battery chargers

n Communications and radio equipment regulator with

external components)

37V ) versions

conditions

switching regulators

regulators

synchronized clock frequency

2%maximum output tolerance over full line and load

90%) step-down

10094203

www.national.com

April 2005

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