MIC2179_09 datasheet(6/13 Pages) MICREL

Part #	MIC2179

Description	1.5A Synchronous Buck Regulator

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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6 / 13 page

Micrel, Inc.

MIC2179

June 2009

6

M9999-063009

Block Diagram

SW

PGND

ISENSE

Amp.

PWM/

Skip-Mode

Select

VREF1.245V

110mΩ

N-channel

110mΩ

P-channel

COMP

VIN

Skip-Mode

Comp.

ILIMIT

Comp.

Output

Control

Logic

Power Good

Comp.

1.13V

R

S

Q

200kHz

Oscillator

PWM

Comp.

3.3V

Regulator

UVLO,

Thermal

Shutdown

VOUT

L

FB

SGND

CC

PWRGD

0.01µF

EN

BIAS

VIN

4.5V to 16.5V

100µF

SYNC

COUT

MIC2179 [Adjustable]

internal

supply Voltage

Enable

Shutdown

Stop

15

14

13

6

8

17

16

3

D

1

2

19

20

R1

R2

7

9

10 11 12

Bold lines indicate

high current traces

ILIMIT

Thresh.

Voltage

PWM

Skip Mode

PWM Mode

5

VIN

Output Good

20k

*

* Connect

SGNDto PGND

RC

Reset

Pulse

Corrective

Ramp

VOUT

1.245

R1

R2

1

R3

4.02k

VOUT = 1.245

( + 1)

R1

R2

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