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廬

ISL8106

Data Sheet

November 10, 2006

FN9283.1

Wide VIN, 7V to 25V, Single-Phase PWM

Controller with Integrated MOSFET

Drivers

The ISL8106 is a Single-Phase Synchronous-Buck PWM

Controller with a input voltage range of +7.0V to +25.0V

featuring Intersil's Robust Ripple Regulator (R

3

) technology

that delivers exceptional dynamic response to input voltage

and output load transients. Integrated MOSFET drivers, 5V

LDO, and bootstrap diode result in fewer components and

smaller implementation area for power supply systems.

The ISL8106 features a 1.5ms digital soft-start and can be

started into a pre-biased output voltage. A resistor divider is

used to program the output voltage setpoint. The ISL8106

can be configured to operate in forced-continuous-

conduction-mode (FCCM) or in diode-emulation-mode

(DEM), which improves light-load efficiency. In FCCM the

controller always operates as a synchronous rectifier,

switching the bottom-side MOSFET regardless of the output

load. With DEM enabled, the bottom-side MOSFET is

disabled preventing negative current flow from the output

inductor during low load operation. This makes the ISL8106

an excellent choice for all 鈥済reen鈥?applications. An audio

filter prevents the PWM switching frequency from entering

the audible spectrum due to extremely light load while in

DEM.

A PGOOD pin featuring a unique fault-identification

capability significantly reduces system trouble-shooting time

and effort. The pull-down resistance of the PGOOD pin is

30惟 for an overcurrent fault, 60惟 for an overvoltage fault, or

90惟 for either an undervoltage fault or during soft-start.

Overcurrent protection is accomplished by measuring the

voltage drop across the r

DS(ON)

of the bottom-side

MOSFET. A single resistor programs the overcurrent and

short-circuit points. Overvoltage and undervoltage protection

is monitored at the FB voltage feedback pin.

Features

鈥?Wide input voltage range: +7.0V to +25.0V

鈥?High performance R

3

technology delivers extremely fast

transient response

鈥?+0.6V Internal Reference

- 鹵0.6% tolerance over the commercial temperature

Range (0擄C to +70擄C)

- 鹵1.0% tolerance over the industrial temperature range

(-40擄C to +85擄C)

鈥?Output voltage range: +0.6V to V

CC

-0.3V

鈥?Selectable forced continuous conduction mode or diode

emulation mode

鈥?Integrated MOSFET drivers with shoot-through protection

鈥?External type-two loop compensation

鈥?Internal 5V low-dropout regulator with Integrated boot-

strap diode

鈥?Programmable PWM frequency: 200kHz to 600kHz

鈥?PWM minimum frequency above audible spectrum

鈥?Internal digital soft-start with prebiased startup capability

鈥?Power good monitor with fault identification by PGOOD

pull down resistance

鈥?Lossless, programmable overcurrent protection

- Uses bottom-side MOSFET鈥檚 r

DS(ON)

鈥?Undervoltage protection, soft crowbar overvoltage

protection and over-temperature protection

鈥?Pb-free plus anneal available (RoHS compliant)

Applications

鈥?Telecom/datacom applications

鈥?Industrial applications

鈥?Distributed DC/DC power architecture

鈥?Point-of-load modules

Pinout

16 LD QFN (4mm x 4mm)

TOP VIEW

PGOOD

TGATE

14

BOOT

13

12 PVCC

11 BGATE

GND

FCCM

EN

3

4

5

COMP

6

FB

7

FSET

8

VO

10 PGND

9

BSOC

16

VIN

VCC

1

2

15

LX

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright Intersil Americas Inc. 2006. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

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