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LM2575-3.3BU Datasheet (PDF) - Micrel Semiconductor

LM2575-3.3BU Datasheet PDF - Micrel Semiconductor
Part # LM2575-3.3BU
Download  LM2575-3.3BU Download

File Size   158.61 Kbytes
Page   12 Pages
Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor
Description 52kHz Simple 1A Buck Regulator

LM2575-3.3BU Datasheet (PDF)

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LM2575-3.3BU Datasheet PDF - Micrel Semiconductor

Part # LM2575-3.3BU
Download  LM2575-3.3BU Click to download

File Size   158.61 Kbytes
Page   12 Pages
Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor
Description 52kHz Simple 1A Buck Regulator

LM2575-3.3BU Datasheet (HTML) - Micrel Semiconductor

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LM2575-3.3BU Product details


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.




Features

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

• Voltage over specified line and load conditions:

        Fixed version: ±3% max. output voltage

       Adjustable version: ±2% max. feedback voltage

• Guaranteed 1A output current

• Wide input voltage range: 4V to 40V

• Wide output voltage range 1.23V to 37V

• Requires only 4 external components

• 52kHz fixed frequency internal oscillator

• Low power standby mode IQ typically < 200µA

• 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

external components

• Negative Boost Converter




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