Datasheet > LM2574-3.3

LM2574-3.3

更新时间： 2024-10-26 22:15:15

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		稳压器
页数	文件大小	规格书
24页	385K
描述
EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGULATOR

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LM2574-3.3 数据手册

Order this document by LM2574/D

EASY SWITCHER

0.5 A STEP–DOWN

VOLTAGE REGULATOR

The LM2574 series of regulators are monolithic integrated circuits ideally

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.

These regulators were designed to minimize the number of external

components to simplify the power supply design. Standard series of

inductors optimized for use with the LM2574 are offered by several different

inductor manufacturers.

SEMICONDUCTOR

TECHNICAL DATA

Since the LM2574 converter is a switch–mode power supply, its efficiency

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.

The LM2574 features include a guaranteed ±4% tolerance on output

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 µA (typical) standby current. The output switch

includes cycle–by–cycle current limiting, as well as thermal shutdown for full

protection under fault conditions.

N SUFFIX

PLASTIC PACKAGE

CASE 626

Features

• 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions

PIN CONNECTIONS

• Adjustable Version Output Voltage Range, 1.23 to 37 V ±4% max over

Line and Load Conditions

Sig Gnd

ON/OFF

• Guaranteed 0.5 A Output Current

Output

• 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

Pwr Gnd

(Top View)

* No internal connection, but should be soldered to

* PC board for best heat transfer.

• Uses Readily Available Standard Inductors

• Thermal Shutdown and Current Limit Protection

Applications

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

LM2574–3.3

LM2574–5

LM2574–12

LM2574–15

LM2574–ADJ

3.3 V

5.0 V

12 V

• 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

15 V

1.23 V to 37 V

ORDERING INFORMATION

• Power Supply for Battery Chargers

Operating

Temperature Range

Device

Package

LM2574N–XX T = –40° to +125°C

DIP–8

XX = Voltage Option, i.e, 3.3, 5, 12, 15 V; and ADJ for

Adjustable Output.

This document contains information on a new product. Specifications and information herein

are subject to change without notice.

Motorola, Inc. 1997

Rev 0

12 3 4 5 6 7...24

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与LM2574-3.3相关器件

型号	品牌	获取价格	描述	数据表
LM2574-3.3BN	MICREL	获取价格	52KHZ SIMPLE 0.5A BUCK REGULATOR
LM2574-3.3BWM	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-3.3BWMT&R	MICREL	获取价格	Switching Regulator, Voltage-mode, 1.8A, 63kHz Switching Freq-Max, PDSO14, 0.300 INCH, SOI
LM2574-3.3BWMT&R	MICROCHIP	获取价格	Switching Regulator, Voltage-mode, 1.8A, 63kHz Switching Freq-Max, PDSO14, 0.300 INCH, SOI
LM2574-3.3HVN	NSC	获取价格	SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regul
LM2574-3.3MDC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2574-3.3MWC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator o
LM2574-3.3YN	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-5	MOTOROLA	获取价格	EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGUL
LM2574-5.0BN	MICREL	获取价格	52KHZ SIMPLE 0.5A BUCK REGULATOR

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