7

FN6666.4

December 22, 2008

FIGURE 3. TYPICAL CHIP SET APPLICATION CIRCUIT WITH INDUCTOR DCR CURRENT SENSE

FIGURE 4. TYPICAL CHIP SET APPLICATION CIRCUIT WITH RESISTOR SENSE

V BAT

VI N

PH A S E1

UG A T E 1

LG A T E 1

OC S E T 1

IS E N 1

VO U T 1

FB 1

PH A SE2

UG A T E 2

LG A T E 2

OC S E T 2

IS E N 2

VO U T 2

FB 2

1. 05 V

1. 5V

LD O 3

PV C C

VC C

PV C C

P GOOD

PG N D

PA D

EN 1

EN 2

FS E T 1

FS E T 2

BO O T 1

B OOT 2

F CCM

LD O 3 E N

0.22µF

0.22µF

IRF7821

IRF7821

IRF7832

IRF7832

2.2µH

2.2µH

24.3k

36.5k

590

1800pF

14k

14k

0.022µF

100k

0.01µF

0.01µF

14k

17.4k

1µF

4.7µF

48.7k

36.5k

1µF

2x330µF

2x330µF

1800pF

590

14k

14k

0.022µF

4x10µF

ISL62391, ISL62392

2x

2x

2x

2x

VB A T

VIN

PH A S E 1

UG AT E1

LG A T E 1

OC S E T 1

IS E N 1

VO U T 1

FB 1

PH A S E 2

UG A T E 2

LG A T E 2

OC S E T 2

ISEN 2

VO U T 2

FB 2

1.05V

1.5V

3.3 V

LD O 3

PV C C

VC C

PV C C

P GOO D

PG N D

GN D

EN 1

EN 2

FS E T 1

FS E T 2

BO O T 1

BO O T 2

FC C M

LD O 3 E N

0.22µF

0.22µF

IRF7821

IRF7832

IRF7832

2.2µH

2.2µH

4x10µF

ISL62391, ISL62392

0.01µF

0.01µF

17.4k

14k

1µF

1µF

4.7µF

48.7k

36.5k

1800pF

1800pF

590

590

100k

36.5k

24.3k

2x330µF

2x330µF

0.001

0.001

1k

1k

1k

1k

IRF7821

2x

2x

2x

2x

ISL62391, ISL62392