LM2574DW

更新时间： 2024-10-27 04:19:07

品牌	Logo	应用领域
安森美 - ONSEMI		稳压器开关
页数	文件大小	规格书
28页	268K
描述
0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator

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LM2574DW 数据手册

LM2574

0.5 A, Adjustable Output

Voltage, Step-Down

Switching 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.

http://onsemi.com

SO–16W

DW SUFFIX

CASE 751G

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.

PDIP–8

N SUFFIX

CASE 626

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.

PIN CONNECTIONS

Output

Sig Gnd

Features

ON/OFF

Pwr Gnd

• 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 Line and Load Conditions

(Top View)

• 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

Sig Gnd

ON/OFF

Output

Pwr Gnd

(Top View)

• Uses Readily Available Standard Inductors

• Thermal Shutdown and Current Limit Protection

* No internal connection, but should be soldered to

* PC board for best heat transfer.

Applications

• Simple and High–Efficiency Step–Down (Buck) Regulators

• Efficient Pre–regulator for Linear Regulators

• On–Card Switching Regulators

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 24 of this data sheet.

• Positive to Negative Converters (Buck–Boost)

• Negative Step–Up Converters

• Power Supply for Battery Chargers

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 24 of this data sheet.

Semiconductor Components Industries, LLC, 2002

Publication Order Number:

February, 2002 – Rev. 5

LM2574/D

12 3 4 5 6 7...28

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与LM2574DW相关器件

型号	品牌	获取价格	描述	数据表
LM2574DW-ADJ	ONSEMI	获取价格	EASY SWITCHER 0.5 A STEP-DOWN VOLTAGE REGULATOR
LM2574DW-ADJR2	ONSEMI	获取价格	0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
LM2574DW-ADJR2G	ONSEMI	获取价格	0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator
LM2574HV	NSC	获取价格
LM2574HV	TI	获取价格	SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
LM2574HV-12MDC	NSC	获取价格	1.8A SWITCHING REGULATOR, 63kHz SWITCHING FREQ-MAX, UUC, DIE
LM2574HV-15MDC	NSC	获取价格	1.8A SWITCHING REGULATOR, 63kHz SWITCHING FREQ-MAX, UUC, DIE
LM2574HV-15MWC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator o
LM2574HV3.3MDC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2574HV3.3MWC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator o

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