11

FN9042.8

June 8, 2006

ISL6224 DC-DC Converter Application Circuits

Figure 5 shows an application circuit of a DC/DC converter

for a notebook PC. The power supply provides +V2_5S from

detailed information on the circuit, including a bill of materials

and circuit board description, see Application Note AN9983.

Also see Intersil’s web site (http://www.intersil.com) for the

latest information.

FIGURE 5. APPLICATION CIRCUIT FOR ONE-STEP CONVERSION (MODE 1)

GND

Q1

+V2_5S

VSEN

UGATE

PHASE

ISL6224

+

+

C1

C2

330µF

L1

1/2 FDS6912A

56µF

1µF

6.4µH

GND

3

7

10

13

2

1

11

15

PGND

LGATE

Q2

6

8

ISEN

Risen

TBD

9

C6

0.1µF

BOOT

VIN

12

EN

CR1

4

(3A)

0.015µF

14

PGOOD

C4

R4

SOFT

2/2 FDS6912A

+

VCC

33µF

C3

FCCM

16

5

VOUT

R2

TBD

R3

C5

C6

OCSET

ISL6224