FN9288 Rev 2.00

Page 10 of 22

Jan 17, 2007

ISL6257

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Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such

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+

-

FIGURE 19. FUNCTIONAL BLOCK DIAGRAM

514k



32k



BGATE

DCIN

VDD

BOOT

UGATE

PHASE

EN

GND

FB

CSIP CSOP CHLIM

ACLIM

ICOMP

VCOMP

VADJ

CELLS

VREF

SGATE

CSIP CSIN

DCSET

DCPRN

+

-

+

-

CA1

X19.9

+

-

CA2

X19.9

1.26V

1.26V

ACSET

ACPRN

CSON

LDO

REGULATOR

VDDP

LGATE

PGND

PWM

300kHz

RAMP

+

-

1.065V



16k



48k



288k



-

gm1

REFERENCE

VOLTAGE

SELECTOR

VDD

514k



VREF

152k



152k



VREF

2.1V

MIN

CURRENT

BUFFER

gm3

ADAPTER

CURRENT

LIMIT SET

+

-

+

-

+

-

MIN

VOLTAGE

BUFFER

-

gm2