Microchip MIC4574 Handleiding

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 2020 Microchip Technology Inc.DS20006472A-page 1

MIC4574

Features

•Fixed 200kHz Operation

•3.3V, 5V, and Adjustable Output Versions

•Voltage over Specified Line and Load Conditions:

-Fixed Version: ±3% Max. Output Voltage

-Adjustable Version: ±2% Max. Feedback

Voltage

•Guaranteed 0.5A Switch Current

•Wide 4V to 24V Input Voltage Range

•Wide 1.23V to 20V Output Voltage Range

•Requires Minimum External Components

•<200µA Typical Shutdown Mode

•75% Efficiency (Adjustable Version >75% typ.)

•Standard Inductors and Capacitors are 25% of

Typical LM2574 Values

•Thermal Shutdown

•Overcurrent 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

External Components

•Negative Boost Converter

General Description

The MIC4574 is a series of easy to use fixed and

adjustable BiCMOS step-down (buck) switch-mode

voltage regulators. The 200kHz MIC4574 duplicates

the pinout and function of the 52kHz LM2574. The

higher switching frequency may allow up to a 2:1

reduction in output filter inductor size.

The MIC4574 is available in 3.3V and 5V fixed output

versions or a 1.23V to 20V adjustable output version.

Both versions are capable of driving a 0.5A load with

excellent line and load regulation.

The feedback voltage is guaranteed to ±2% tolerance

for adjustable versions, and the output voltage is

guaranteed to ±3% for fixed versions, within specified

voltages and load conditions. The oscillator frequency

is guaranteed to ±10%.

In shutdown mode, the regulator draws less than

200μA standby current. The regulator performs

cycle-by-cycle current limiting and thermal shutdown

for protection under fault conditions.

This series of simple switch-mode regulators requires

a minimum number of external components and can

operate using a standard series of inductors.

Frequency compensation is provided internally.

The MIC4574 is available in the DIP (N) package and

is rated over the industrial temperature range.

Package Type

MIC4574

8-Lead PDIP (N)

(Top View)

1

2

3

4

8

7

6

5

FB

SGND

SHDN

PGND

NC

SW

NC

V

IN

0.5A, 200kHz Buck Regulator

Product specificaties