18

LT1533

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

SHDN

DUTY

SYNC

COL A

COL B

PGND

FB

NFB

LT1533

GND

5V

14

2

15

16

13

12

7

11

3

4

5

6

10

1500pF

18k

0.01

µF

10k

2.49k

1%

L2

FB2

FB1

4.7

µF

10k

+

T1

L1

300

µH

12V

5A

L3

33

µH

8

9

21.5k

1%

+

+

100

µF

100

µF

1N5817

1N5817

1N4148

1N4148

1553 TA07

OPTIONAL FOR

LOWEST RIPPLE

()

330

Ω

330

Ω

0.05

Ω

0.05

Ω

4.7

µF

+

Q2

Q1

0.003

µF

680

Ω

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