LT1533C View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LT1533C

Ultralow Noise 1A Switching Regulator

Linear Technology 

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LT1533

TYPICAL APPLICATIONS

A 10W Low Noise 5V to 12V Converter. Q1-Q2 Provide 5A Output Capacity

While Preserving LT1533’s Voltage Current Slew Control. Efficiency Is 68%.

Higher Input Voltages Minimize Follower Loss, Boosting Efficiency Above 71%.

See AN70 for Details

5V

+

14

4.7µF

11 SHDN

VIN

2

COL A

FB1

+

1500pF

18k

3

DUTY

15 FB2

4

COL B

SYNC

5 CT

16 L2

PGND

LT1533

13 10k

6 RT

RVSL

12 10k

RCSL

10

VC GND

0.01µF

9

7

FB

NFB

8

2.49k

1%

1N4148 330Ω

0.05Ω

Q1

T1

4.7µF Q2

0.05Ω

330Ω

1N4148

1N5817

0.003µF

L1

300µH

12V

5A

( ) L3 OPTIONAL FOR

33µH LOWEST RIPPLE

680Ω

1N5817

+

100µF

+

100µF

21.5k

1%

L1:COILTRONICS CTX300-4

L2:22nH TRACE INDUCTANCE, FERRITE BEAD OR

INDUCTOR COILCRAFT B-07T TYPICAL

L3:COILTRONICS CTX33-4

Q1, Q2:MOTOROLA D45C1

T1:COILTRONICS CTX02-13949-X1

FB1, FB2:FERRONICS FERRITE BEAD 21-110J

1553 TA07

18

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