LT1158

16

0.01

µF

LT1158 F12

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

BOOST

T GATE DR

T GATE FB

T SOURCE

B GATE DR

BOOST DR

BIAS

ENABLE

FAULT

INPUT

GND

B GATE FB

LT1158

+

+

1N4148

10

µF

24k

1000pF

0.05

µF

1k

510

Ω

1N4148

1

2

3

4

8

7

6

5

LT1431

1000

µF

LOW ESR

500

µF

LOW ESR

20m

Ω

SHORT-CIRCUIT

CURRENT = 6A

+5V/4A

OUTPUT

8V TO 20V INPUT

IRFZ34

510k

+

0.1

µF

×

L1: COILTRONICS

CTX50-5-52

VISHAY/ULTRONIX RCS01, SM1

ISOTEK CORP. ISA-PLAN SMR

CONSTANT OFF TIME CURRENT MODE CONTROL LOOP

FREQUENCY =

VP0300

INSERT FOR

ZERO POWER

SHUTDOWN

100k

CMOS

ON/OFF

SEE FIGURE 4 FOR EFFICIENCY CURVE

100

Ω

100

Ω

IRFZ44

L1

50

µH

+–

2N2222

100k

1

)

1 –

Figure 12. High Efficiency 5V Step-Down Switching Regulator (Requires No Heatsinks)

200pF

1000pF

LT1158 F11

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

BOOST

T GATE DR

T GATE FB

T SOURCE

B GATE DR

BOOST DR

BIAS

ENABLE

FAULT

INPUT

GND

B GATE FB

LT1158

+

0.01

µF

10

µF

0.33µF

DRIVER SUPPLY 10V TO 15V

WITH LOGIC-LEVEL Q1, Q2)

24k

0.01

µF

1

2

3

4

8

7

6

5

LT1431

+

330

µF

6.3V

AVX

× 4

220

µF

10V

OS-CON

× 4

L1

8

µH

0.01

Ω

EA

SHORT-CIRCUIT

CURRENT = 22A

15A

500k

0.22

µF

1

2

3

4

8

7

6

5

CMOS

555

1%

4.99k

1%

16k

470pF

+

Q1, Q2: MTB75N05HD (USE WITH 10V TO 15V DRIVER SUPPLY)

CMOS 555: LMC555 OR TLC555

L1: COILTRONICS CTX02-12171-1

Q2

3.3k

+

–

SHUTDOWN

Q1

BAS16

2.90V

806

Ω

3.05V

1.10k

3.30V

1.62k

3.45V

1.91k

3.60V

2.21k

Figure 11. 5V to 3.XXV,15A Converter (Uses PC Board Area for Heatsink)