ISL6261AIRZ View Datasheet(PDF) -

Functional Pin Description

ISL6261A

40 39 38 37 36 35 34 33 32 31

FDE 1

PMON 2

RBIAS 3

VR_TT# 4

NTC 5

SOFT 6

OCSET 7

VW 8

COMP 9

FB 10

GND PAD

(BOTTOM)

30 VID2

29 VID1

28 VID0

27 VCCP

26 LGATE

25 VSSP

24 PHASE

23 UGATE

22 BOOT

21 NC

11 12 13 14 15 16 17 18 19 20

FDE

Forced diode emulation enable signal. Logic high of FDE

with logic low of DPRSTP# forces the ISL6261A to operate

in diode emulation mode with an increased VW-COMP

voltage window.

PMON

Analog voltage output pin. The voltage potential on this pin

indicates the power delivered to the output.

RBIAS

A 147K resistor to VSS sets internal current reference.

VR_TT#

Thermal overload output indicator with open-drain output.

Over-temperature pull-down resistance is 10.

NTC

Thermistor input to VR_TT# circuit and a 60µA current

source is connected internally to this pin.

SOFT

A capacitor from this pin to GND pin sets the maximum slew

rate of the output voltage. The SOFT pin is the non-inverting

input of the error amplifier.

OCSET

Overcurrent set input. A resistor from this pin to VO sets

DROOP voltage limit for OC trip. A 10µA current source is

connected internally to this pin.

7

VW

A resistor from this pin to COMP programs the switching

frequency (eg. 6.81k = 300kHz).

COMP

The output of the error amplifier.

FB

The inverting input of the error amplifier.

VDIFF

The output of the differential amplifier.

VSEN

Remote core voltage sense input.

RTN

Remote core voltage sense return.

DROOP

The output of the droop amplifier. DROOP-VO voltage is the

droop voltage.

DFB

The inverting input of the droop amplifier.

VO

An input to the IC that reports the local output voltage.

FN6354.3

November 5, 2009

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