SC1163 查看數據表（PDF） - Semtech Corporation

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SC1163

PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER WITH LOW DROPOUT REGULATOR CONTROLLER

Semtech Corporation 

October 25, 1999

MATERIALS LIST

PROGRAMMABLE SYNCHRONOUS DC/DC

CONVERTER WITH LOW DROPOUT

REGULATOR CONTROLLER

SC1162/3

Qty. Reference Part/Description

4 C1,C5,C13,C 0.1µF Ceramic

18

6 C2,C3,C14- 1500µF/6.3V

C17

3 C11,C12, 330µF/6.3V

C21

1 L1

4µH

3 Q1,Q2,Q3 See notes

Vendor

Various

SANYO

Various

See notes

1 R4

1 R5

1 R6

1 R1

1 R12

1 R13

1 R17

5mΩ

IRC

2.32kΩ, 1%, 1/8W Various

1kΩ, 1%, 1/8W

Various

10Ω, 5%, 1/8W

Various

1%, 1/8W

Various

1%, 1/8W

Various

100k, 5%, 1/8W Various

1 U1

SC1162/3CSW

SEMTECH

Notes

MV-GX or equiv. Low ESR

8 Turns 16AWG on MICROMETALS T50-52D core

FET selection requires trade-off between efficiency and

cost. Absolute maximum RDS(ON) = 22 mΩ for Q1,Q2

OAR-1 Series

See Table (Not required for SC1162)

See Table (Not required for SC1162)

Required if Voltage is applied to the linear FET without

12V applied to SC1162/3

SETTING LDO OUTPUT VOLTAGE

VO LDO

3.45V

3.30V

3.10V

2.90V

2.80V

2.50V

1.50V

RB

R12

105Ω

105Ω

102Ω

100Ω

100Ω

100Ω

100Ω

RA

R13

182Ω

169Ω

147Ω

130Ω

121Ω

97.6Ω

18.7Ω

VOUT

= 1.265 ⋅ (R A

RB

+ RB)

+ (I FB ⋅ R A )

Where :

IFB = Feedback pin bias current

R A = Top feedback resistor

R B = Bottom feedback resistor

See layout diagram for clarificat ion

R A and R B must be low enough so

that the (IFB ⋅ R A ) term does not cause

significan t error

© 1999 SEMTECH CORP.

6

652 MITCHELL ROAD NEWBURY PARK CA 91320

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