MIC5158 데이터 시트보기 (PDF) - Micrel

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MIC5158

Super LDO™ Regulator Controller

Micrel 

MIC5156/5157/5158

Block Diagram MIC5156

+12V Input

0.1µF

VP

+5V Input

VDD

Micrel, Inc.

12k

+5V Input

Switched

5V Load

Q2

FLAG

Internal

Bias

EN

Enable

Shutdown

RS

3mΩ

1.235V

Bandgap

Reference

to all

internal blocks

ILIMIT

Comparator

D (Drain)

35mV

[ ILIMIT ]

VO U T

Comparator

Error

Amp

75mV

* fixed version only

† 3.3V = 17k, 5V = 32k

16.6V

17k†

10k

G (Gate)

Q1

SMP60N03-10L

S* (Source) Regulated

+3.3V Output

GND CL

‡ adjustable version only

EA‡

Block Diagram with External Components

Fixed 3.3V Power Supply with 5.0V Load Switch

Block Diagram MIC5157

0.1µF C1 0.1µF C2

C1+ C1– C2+ C2– VC P

C3

1µF

+5V Input

VDD

Oscillator

Charge Pump

Tripler

FLAG

1.235V

Bandgap

Reference

VO U T

Comparator

Error

Amp

75mV

VC P

Clamp

Internal

Bias

EN

Enable

Shutdown

RS

3mΩ

to all

niternal blocks

ILIMIT

Comparator

35mV

D (Drain)

[ ILIMIT ]

16.6V

58k

G (Gate)

Q1

IRFZ44

S (Source)* Regulated

+3.3V Output

5V

CL

15k

3.3V

17k

10k

GND

MIC5156/5157/5158

Block Diagram with External Components

Fixed 3.3V 10A Power Supply

6

August 2005

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