LM2575T-ADJ(2004) データシートの表示（PDF） - ON Semiconductor

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LM2575T-ADJ
(Rev.:2004)

1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator

ON Semiconductor 

LM2575

1.0 A, Adjustable Output

Voltage, Step−Down

Switching Regulator

The LM2575 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 1.0 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 LM2575 are offered by several

different inductor manufacturers.

Since the LM2575 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 many cases, the power dissipated by the LM2575 regulator is so

low, that no heatsink is required or its size could be reduced

dramatically.

The LM2575 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 80 mA typical standby current. The

output switch includes cycle−by−cycle current limiting, as well as

thermal shutdown for full protection under fault conditions.

Features

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

• Adjustable Version Output Voltage Range of 1.23 V to 37 V ±4%

Maximum Over Line and Load Conditions

• Guaranteed 1.0 A Output Current

• Wide Input Voltage Range: 4.75 V 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

• Moisture Sensitivity Level (MSL) Equals 1

• Pb−Free Packages are Available

Applications

• 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

http://onsemi.com

1

5

TO−220

TV SUFFIX

CASE 314B

Heatsink surface connected to Pin 3

TO−220

T SUFFIX

CASE 314D

1

5

Pin 1. Vin

2. Output

3. Ground

4. Feedback

5. ON/OFF

1

5

D2PAK

D2T SUFFIX

CASE 936A

Heatsink surface (shown as terminal 6 in

case outline drawing) is connected to Pin 3

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 24 of this data sheet.

*For additional information on our Pb−Free strategy

and soldering details, please download the

ON Semiconductor Soldering and Mounting

Techniques Reference Manual, SOLDERRM/D.

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 24 of this data sheet.

© Semiconductor Components Industries, LLC, 2004

1

May, 2004 − Rev. 6

Publication Order Number:

LM2575/D

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