LM2574-3.3BWM Micrel Semiconductor, LM2574-3.3BWM Datasheet

LM2574-3.3BWM

Manufacturer Part Number

LM2574-3.3BWM

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.LM2574-3.3BWM.pdf (8 pages)

Specifications of LM2574-3.3BWM

Date_code

03+

Packing_info

SOICW-14L

Current page: 1 of 8
Download datasheet (42Kb)

General Description

The LM2574 family is a series of easy to use fixed and

adjustable switching voltage regulators. The LM2574 con-

tains all of the active circuitry necessary to construct a

stepdown (buck) switching regulator and requires a minimum

of external components.

The LM2574 is available in 3.3V and 5V fixed output versions,

or an adjustable version with an output voltage range of 1.23V

to 37V. Output voltage is guaranteed to 4% for specified

input and load conditions.

The LM2574 can supply 0.5A while maintaining excellent line

and load regulation. The output switch includes cycle-by-

cycle current limiting, as well as thermal shutdown for full

protection under fault conditions.

An external shutdown connection selects operating or standby

modes. Standby current is less than 200 A.

Heat sinks are generally unnecessary due the regulator’s

high efficiency. Adequate heat transfer is usually provided by

soldering all package pins to a printed circuit board.

The LM2574 includes internal frequency compensation and

an internal 52kHz fixed frequency oscillator guaranteed to

Circuits constructed around the LM2574 use a standard

series of inductors which are available from several different

manufacturers.

All support documentation can be found on Micrel’s web

site at www.micrel.com.

Typical Application

December 2003

LM2574

10% of the frequency.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

UNREGULATED

40V MAX

DC IN

22µF

Figure 1. Fixed Output Regulator Circuit

PWR

GND

LM2574

GND

SIG

OFF

ON/

OUT

Features

• 3.3V, 5V, 12V, and adjustable output versions

• Adjustable version output 1.23V to 37V 4% max. over

• Guaranteed 0.5A output current

• Wide input voltage, up to 40V

• Thermal shutdown and current limit protection

• Requires only 4 external components.

• Shutdown capability (standby mode)

• Low power standby mode < 200 A Typical

• High-efficiency

• 52kHz fixed frequency internal oscillator

• Uses standard inductors

Applications

• Simple high-efficiency step-down (buck) regulator

• Efficient pre-regulator for linear regulators

• On-card switching regulators

• Positive to negative converter (buck-boost)

Ordering Information

Part Number

LM2574BN

LM2574-3.3BN

LM2574-5.0BN

line and load conditions.

11DQ05

330µH

52kHz Simple 0.5A Buck Regulator

REGULATED

OUTPUT

0.5A

220µF

OUT

Junction Temp. Range

–40 C to +85 C

LM2574

8-pin Plastic DIP

Package

M9999-122303

Micrel

Related parts for LM2574-3.3BWM

Related keywords

LM2574-3.3BWM datasheet
LM2574-3.3BWM data sheet
LM2574-3.3BWM pdf datasheet
LM2574-3.3BWM component
LM2574-3.3BWM part
LM2574-3.3BWM distributor
LM2574-3.3BWM RoHS
LM2574-3.3BWM datasheet download