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廬

ISL6534

Data Sheet

December 21, 2004

FN9134.1

Dual PWM with Linear

The ISL6534 is a versatile triple regulator that has two

independent synchronous-rectified buck controllers with

integrated 12V gate drivers (OUT1 and OUT2) and a linear

controller (OUT3) to offer precision regulation of up to three

voltage rails. An optional shunt regulator allows 12V only

operation, when a 5V supply is not available.

Each controller has independent soft-start and enable

functions combined on a single pin. A capacitor from each

SS/EN pin to ground sets the soft-start time, and pulling

SS/EN below 1.0V disables the controller. The SS/EN pins

can be controlled independently or they can be ganged

together to provide complete control of start-up coordination.

The PGOOD function indicates when all regulators have

completed their soft start and provides an indication of short-

circuit conditions on either switching regulator.

There are two ways to control the switching frequency of the

PWM regulators. The default switching frequency is 300kHz

(FS_SYNC pin open). A resistor from FS_SYNC to ground

increases the switching frequency (up to 1MHz). Connecting

the gate signal from another PWM IC synchronizes the

ISL6534 switchers to the frequency of the other controller.

This allows independent regulators operating at a common

frequency to avoid low-frequency beats. The gate drivers for

DDR mode can be staggered by 90擄 in order to minimize

cross-conduction.

Switcher OUT1 has an internal 0.8% accurate reference for

regulating any voltage down to 0.6V. OUT2 has current

sinking capability and an external reference input allowing

convenient connection to OUT1 through a resistor divider for

DDRAM applications. The 3.3V reference pin provides the

option for independent regulation of OUT2. The linear

controller drives an external N-Channel MOSFET, making

the ISL6534 one of the most versatile regulators available.

Features

鈥?Two Synchronous-Rectified Buck Controllers

- Voltage Mode control

- VIN range up to 12V

- VOUT range from 0.6V to 6V

- 12V LGATE drivers; up to 12V Boot Strap for UGATE

鈥?Switcher References

- 0.6V Reference for OUT1 (0.8% Accurate)

- 3.3V Reference Output for OUT2 (0.8% Accurate)

- External Reference Input for OUT2

- Buffered VTT Reference Output

鈥?Switcher clocking

- Phase options for Optimal Clock Relationship

- Resistor-Selectable Switching Frequency (300kHz

default; Resistor to Ground for 300kHz to 1MHz range)

- Synchronization-Capable Switching Frequency

(Connect FS_SYNC to Separate Regulator)

鈥?Single Linear Controller

- Drives N-Channel MOSFET

- 0.6V Reference (0.8% Accurate)

- VIN range up to 12V

- VOUT range from 0.6V to 6V

鈥?12V and 5V supplies required (but optional shunt regulator

can generate VCC = 5.8V from 12V)

鈥?Three Independent Soft-Start/Enable Pins

- Gang Together or Control Independently

鈥?PGOOD Output Indicates All Outputs Available

鈥?Thermally Enhanced QFN or TSSOP Package

鈥?QFN Package:

- Compliant to JEDEC PUB95 MO-220

QFN - Quad Flat No Leads - Package Outline

- Near Chip Scale Package footprint, which improves

PCB efficiency and has a thinner profile

鈥?Pb-Free Available (RoHS Compliant)

Simplified Block Diagram

SS1/EN1

COMP1

FB1

SS2/EN2

REFIN

FB2

COMP2

OUT1

PWM CONTROLLER

BOOT1

UGATE1

LGATE1

OUT2

PWM CONTROLLER

BOOT2

UGATE2

LGATE2

REFOUT

VREF

SS3/EN3

FB3

3.3V

OUT3

LINEAR CONTROLLER

PGOOD

FS/SYNC

DRIVE3

1

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

1-888-INTERSIL or 321-724-7143

|

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

Copyright Intersil Americas Inc. 2004. All Rights Reserved

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

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