MIC2179 Ver la hoja de datos (PDF) - Micrel

Número de pieza

componentes Descripción

fabricante

MIC2179

1.5A Synchronous Buck Regulator

Micrel 

Micrel, Inc.

Block Diagram

UVLO,

Thermal

Shutdown

Enable

Shutdown

EN

15

3.3V

Regulator

R3

4.02k

BIAS

14

0.01µF

internal

supply Voltage

Skip Mode

PWM Mode

PWM

5

PWM/

Skip-Mode

Select

Corrective

Ramp

Stop

SYNC

200kHz

13

Oscillator

Reset

Pulse

R

Q

S

RC COMP

8

CC

MIC2179 [Adjustable]

MIC2179

Output

Control

Logic

ILIMIT

Comp.

ILIMIT

Thresh.

Voltage

VIN

4.5V to 16.5V

VIN 16 17

100µF

ISENSE

Amp.

110mΩ

P-channel

110mΩ

N-channel

VOVUOTUT = 11..224455( RRRR1221+ 1) 1

SW

L

3

PGND

1

2

19

20

D

COUT

*

* Connect

SGND to PGND

Bold lines indicate

high current traces

VOUT

Skip-Mode

Comp.

PWM

Comp.

VREF 1.245V

SGND 9 10 11 12

Power Good

Comp.

FB

7

VIN

20k

PWRGD

6

R1

R2

Output Good

1.13V

June 2009

6

M9999-063009

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