MIC4574BWM Micrel Semiconductor, MIC4574BWM Datasheet

MIC4574BWM

Manufacturer Part Number

MIC4574BWM

Description

200kHz Simple 0.5A Buck Voltage Regulator

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC4574BWM.pdf (6 pages)

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MIC4574

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

conditions. The oscillator frequency is guaranteed to 10%.

In shutdown mode, the regulator draws less than 200 A

standby current.

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 compensa-

tion is provided internally.

The MIC4574 is available in DIP (N) and SOIC (WM) pack-

ages for the industrial temperature range.

Typical Applications

3% for fixed versions, within specified voltages and load

The regulator performs cycle-by-cycle

6V to 24V

Shutdown

Enable

10µF

35V

8V to 24V

Shutdown

Enable

47µF

35V

SHDN

SGND

MIC4574BWM

SHDN

PGND

MIC4574-5.0BN

SGND

Adjustable Regulator

Fixed Regulator

PGND

4-92

MBRS130LT3

100µH

Features

• Fixed 200kHz operation

• 3.3V, 5V, and adjustable output versions

• Voltage over specified line and load conditions:

• Guaranteed 0.5A switch current

• Wide 4V to 24V input voltage range

• Wide 1.23V to 20V output voltage range

• Requires minimum external components

• < 200 A typical shutdown mode

• 75% efficiency (adjustable version > 75% typ.)

• Standard inductors and capacitors are

• Thermal shutdown

• Overcurrent protection

• 100% electrical thermal limit burn-in

Applications

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

• Efficient preregulator for linear regulators

• On-card switching regulators

• Positive-to-negative converter (inverting buck-boost)

• Isolated flyback converter using minimum external

• Negative boost converter

200kHz Simple 0.5A Buck Voltage Regulator

25% of typical LM2574 values

components

Fixed version: 3% max. output voltage

Adjustable version: 2% max. feedback voltage

1N5819

100µH

2.49k

1.50k

5.0V/0.5A

3300pF

220µF

16V

MIC4574

3.3V/0.5A

330µF

6.3V

April 1998•

Micrel

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MIC4574BWM Summary of contents

Page 1

... Isolated flyback converter using minimum external components • Negative boost converter 3 7 SHDN SW MIC4574-5.0BN SGND PGND 47µ 35V Fixed Regulator SHDN SW 100µH MIC4574BWM SGND PGND MBRS130LT3 Adjustable Regulator 4-92 MIC4574 L1 5.0V/0.5A 100µH C2 220µF 16V D1 1N5819 3.3V/0. 2.49k 3300pF ...

Page 2

... MIC4574 Ordering Information Part Number MIC4574-3.3BN MIC4574-5.0BN MIC4574BN MIC4574-3.3BWM MIC4574-5.0BWM MIC4574BWM Pin Configuration FB 1 SGND 2 SHDN 3 PGND 4 8-Pin DIP (N) Pin Description Pin Number Pin Number Pin Name N Package WM Package SGND 3 5 SHDN 4 6 PGND April 1998• Voltage Temperature Range 3.3V – ...

Page 3

MIC4574 Absolute Maximum Ratings Supply Voltage (V ) Note 1 ....................................... +40V IN Shutdown (V ) ....................................... –0.3V to +36V SHDN Output Switch (V ) steady state ................................. –1V SW Junction Temperature (T ) ...................................... +150 C J Storage Temperature ...

Page 4

MIC4574 Block Diagrams Shutdown Enable SHDN MIC4574-x.x Shutdown Enable SHDN MIC4574 April 1998• +24V max Internal Regulator Thermal Current Shutdown Limit 200kHz Oscillator Driver Com- parator 0.5A Switch 1.23V Bandgap Error Amp GND Block Diagram with ...

Page 5

MIC4574 Functional Description The MIC4574 is a variable duty cycle switch-mode regulator with an internal power switch. Refer to the block diagrams. Supply Voltage The MIC4574 operates from a +4V to +24V unregulated input. Highest efficiency operation is from a ...

Page 6

... D1 MBRS130LT3 Sanyo 35CV168GX, ESR = 0.34 C2 Sanyo 16CV470GX, ESR = 0.17 D1 Motorola MBRS130LT3 L1 Coilcraft DO3316P-104, DCR = 0.23 Low-Cost Surface Mount L1 12 SHDN SW 220µH R2 MIC4574BWM 13. SGND PGND R1 D1 1.50k 4 6 SS16 1% UUX1H470MNT1GS, ESR = 0.4 16CV470GX, ESR = 0.17 DO3316-224, DCR = 0.53 Low-Cost Surface Mount ...

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