LM2575-12 Micrel Semiconductor, LM2575-12 Datasheet

LM2575-12

Manufacturer Part Number

LM2575-12

Description

52kHz Simple 1A Buck Regulator

Manufacturer

Micrel Semiconductor

Datasheet

1.LM2575-12.pdf (7 pages)

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Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM2575-12BN

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MOT

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM2575-12WU

Manufacturer:

Micrel Inc

Quantity:

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LM2575

General Description

The LM2575 series of monolithic integrated circuits provide

all the active functions for a step-down (buck) switching

regulator. Fixed versions are available with a 3.3V, 5V, 12V,

fixed output. Adjustable versions have an output voltage

range from 1.23V to 37V. Both versions are capable of driving

a 1A load with excellent line and load regulation.

These regulators are simple to use because they require a

minimum number of external components and include internal

frequency compensation and a fixed-frequency oscillator.

The LM2575 series offers a high efficiency replacement for

popular three-terminal adjustable linear regulators. It

substantially reduces the size of the heat sink, and in many

cases no heat sink is required.

A standard series of inductors available from several different

manufacturers are ideal for use with the LM2575 series. This

feature greatly simplifies the design of switch-mode power

supplies.

The feedback voltage is guaranteed to 2% tolerance for

adjustable versions, and the output voltage is guaranteed to

output load conditions. The oscillator frequency is guaranteed

to 10%. External shutdown is included, featuring less than

200 A standby current. The output switch includes cycle-by-

cycle current limiting and thermal shutdown for full protection

under fault conditions.

Typical Applications

August 1999

3% for fixed versions, within specified input voltages and

Unregulated

Note: Pin numbers are for TO-220 Package

DC Input

7V–40V

100µF

Fixed Regulator in Typical Application

Gnd

LM2575-5.0

On/Off

Output

1N5822

Feedback

330µH

330µF

OUT

Regulated

+5V, 1A

Output

Unregulated

Note: Pin numbers are for TO-220 Package

DC Input

7V–40V

100µF

Features

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

• Voltage over specified line and load conditions:

• Guaranteed 1A output current

• Wide input voltage range:

• Wide output voltage range

• Requires only 4 external components

• 52kHz fixed frequency internal oscillator

• Low power standby mode I

• 80% efficiency (adjustable version typically > 80%)

• Uses readily available standard inductors

• Thermal shutdown and current limit protection

• 100% electrical thermal limit burn-in

Applications

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

• Efficient pre-regulator for linear regulators

• On-card switching regulators

• Positive to negative converter (inverting Buck-Boost)

• Isolated Flyback Converter using minimum number of

• Negative Boost Converter

OUT

external components

Adjustable Regulator in Fixed Output Application

= 1.23 1 +

Fixed version: 3% max. output voltage

Adjustable version: 2% max. feedback voltage

4V to 40V

1.23V to 37V

52kHz Simple 1A Buck Regulator

Gnd

(

LM2575

On/Off

)

LM2575

Output

1N5822

Feedback

330µH

typically < 200 A

330µF

OUT

Regulated

+5V, 1A

Output

R2 3.09k

R1 1k

M2575

Micrel

870 20

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