LM2574-12 Motorola Inc, LM2574-12 Datasheet
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LM2574-12
Manufacturer Part Number
LM2574-12
Description
EASY SWITCHERE 0.5 A STEP-DOWN VOLTAGE REGULATOR
Manufacturer
Motorola Inc
Datasheet
1.LM2574-12.pdf
(24 pages)
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Advance Information
Easy Switcher
Step-Down Voltage Regulator
suited for easy and convenient design of a step–down switching regulator
(buck converter). All circuits of this series are capable of driving a 0.5 A load
with excellent line and load regulation. These devices are available in fixed
output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version.
components to simplify the power supply design. Standard series of
inductors optimized for use with the LM2574 are offered by several different
inductor manufacturers.
is significantly higher in comparison with popular three–terminal linear
regulators, especially with higher input voltages. In most cases, the power
dissipated by the LM2574 regulator is so low, that the copper traces on the
printed circuit board are normally the only heatsink needed and no additional
heatsinking is required.
voltage within specified input voltages and output load conditions, and 10%
on the oscillator frequency ( 2% over 0 C to +125 C). External shutdown is
included, featuring 60
includes cycle–by–cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
Features
Applications
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
Line and Load Conditions
The LM2574 series of regulators are monolithic integrated circuits ideally
These regulators were designed to minimize the number of external
Since the LM2574 converter is a switch–mode power supply, its efficiency
The LM2574 features include a guaranteed 4% tolerance on output
3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
Adjustable Version Output Voltage Range, 1.23 to 37 V 4% max over
Guaranteed 0.5 A Output Current
Wide Input Voltage Range: 4.75 to 40 V
Requires Only 4 External Components
52 kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit Protection
Simple and High–Efficiency Step–Down (Buck) Regulators
Efficient Pre–regulator for Linear Regulators
On–Card Switching Regulators
Positive to Negative Converters (Buck–Boost)
Negative Step–Up Converters
Power Supply for Battery Chargers
A (typical) standby current. The output switch
0.5 A
XX = Voltage Option, i.e, 3.3, 5, 12, 15 V; and ADJ for
Adjustable Output.
LM2574N–XX T A = –40 to +125 C
LM2574–3.3
LM2574–5
LM2574–12
LM2574–15
LM2574–ADJ
Motorola, Inc. 1997
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
Device
* No internal connection, but should be soldered to
*
PC board for best heat transfer.
VOLTAGE REGULATOR
ORDERING INFORMATION
EASY SWITCHER
0.5 A STEP–DOWN
Pwr Gnd
ON/OFF
Sig Gnd
PIN CONNECTIONS
SEMICONDUCTOR
TECHNICAL DATA
LM2574
PLASTIC PACKAGE
Temperature Range
Order this document by LM2574/D
FB
8
N SUFFIX
CASE 626
1
2
3
4
Operating
(Top View)
1
8
7
6
5
*
Output
*
V in
1.23 V to 37 V
3.3 V
5.0 V
12 V
15 V
Package
DIP–8
Rev 0