MIC2178(1999) 查看數據表（PDF） - Micrel

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产品描述 (功能)

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MIC2178
(Rev.:1999)

2.5A Synchronous Buck Regulator

Micrel 

MIC2178

Block Diagram

UVLO,

Thermal

Shutdown

Enable

Shutdown

EN

20

3.3V

Regulator

BIAS

19

0.01µF

internal

supply Voltage

Skip Mode

PWM Mode

PWM

10

PWM/

Skip-Mode

Select

Corrective

Ramp

Stop

SYNC

200kHz

18

Oscillator

Reset

Pulse

R

Q

S

RC COMP

13

CC

MIC2178 [Adjustable]

VIN

4.5V to 16.5V

VIN 1 2 9

100µF

Micrel

Output

Control

Logic

ILIMIT

Comp.

ILIMIT

Thresh.

Voltage

ISENSE

Amp.

100mΩ

P-channel

100mΩ

N-channel

VOUT

SW

3

8

R1

1.245

R2

L

1

VOUT

PGND

4

5

6

7

D

COUT

*

* Connect

SGND to PGND

Bold lines indicate

high current traces

Skip-Mode

Comp.

PWM

Comp.

VREF 1.245V

SGND 14 15 16 17

Power Good

Comp.

1.13V

FB

12

VIN

20k

PWRGD

11

R1

R2

Output Good

MIC2178

6

June 1998

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