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®
Data Sheet
December 21, 2004
ISL6534
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
www.DataShefuent4cUti.ocnoms 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° 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.
Simplified Block Diagram
SS1/EN1
COMP1
FB1
SS2/EN2
REFIN
FB2
COMP2
VREF
SS3/EN3
FB3
OUT1
PWM CONTROLLER
OUT2
PWM CONTROLLER
3.3V
OUT3
LINEAR CONTROLLER
BOOT1
UGATE1
LGATE1
BOOT2
UGATE2
LGATE2
REFOUT
PGOOD
FS/SYNC
DRIVE3
Features
• 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
• 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
• 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)
• 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
• 12V and 5V supplies required (but optional shunt regulator
can generate VCC = 5.8V from 12V)
• Three Independent Soft-Start/Enable Pins
- Gang Together or Control Independently
• PGOOD Output Indicates All Outputs Available
• Thermally Enhanced QFN or TSSOP Package
• 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
• Pb-Free Available (RoHS Compliant)
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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ISL6534
Ordering Information
TEMP.
PART NUMBER (°C)
PACKAGE
PKG. DWG.
#
ISL6534CV
0 to 70 24 Ld EPTSSOP
(exposed pad)
M24.173B
ISL6534CVZ
(See Note)
0 to 70 24 Ld EPTSSOP
M24.173B
(exposed pad) (Pb-free)
ISL6534CR
0 to 70 32 Ld 5x5 QFN
L32.5x5
ISL6534CRZ
(See Note)
0 to 70 32 Ld 5x5 QFN
(Pb-free)
L32.5x5
NOTE: Intersil Pb-free products employ special Pb-free material
www.DataSheseett4sU; m.coolmding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-
020C.
Add “-T” suffix for tape and reel.
Pinouts (see Pin Descriptions, page 9)
2 FN9134.1

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Block Diagram
SS1/EN1
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SS2/EN2
SS3/EN3
VCC5
30µA
VCC5
30µA
VCC5
30µA
3.3V
ISL6534
VCC
POWER
ON
RESET
AND CONTROL
VREF
VCC5
5.8V
REFERENCE 3.3V
BIAS CURRENT
0.6V
3.3V
PGOOD =
all 3 SS ramps done
with no COMP short
CLOCK AND
SAWTOOTH
GENERATOR
PGOOD
COMP1
FB1
REFIN
FB2
COMP2
0.6V
3.3V
1-2 CLOCK
CYCLE
FILTER
MONITOR
IF SHORT > FILTER,
COMP PINS SHUT DOWN ALL
FOR SHORTS 3 OUTPUTS
VCC12
BOOT1
OUTPUT1
DRIVERS
GATE CONTROL
LOGIC
DEAD-TIME
CONTROL
UGATE1
LGATE1
BOOT2
OUTPUT2
DRIVERS
GATE CONTROL
LOGIC
DEAD-TIME
CONTROL
UGATE2
LGATE2
FS/SYNC
REFOUT
0.6V
FB3
DRIVE3
GND
PGND
FIGURE 1. BLOCK DIAGRAM
3
FN9134.1

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ISL6534
Typical Application, DDRAM Controller
VOLTAGE INPUTS REQUIRED
VCC12 (12V)
VCC (5V OR 5.8V FROM SHUNT)
VIN1, VBS1
VIN2, VBS2
VIN3
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VOUT1
ISL6534
DDR MODE
VCC
VOLTAGE OUTPUTS
VCC12
VOUT1
VOUT2
OPTIONAL R FOR
SHUNT REGULATOR
VOUT3
VCC
VCC12
VBS1
VCC12
COMP1
FB1
BOOT1
VIN1
UGATE1
VOUT1
VOUT2
VOUT1 (DDR)
VTTREF
VREF
COMP2
LGATE1
FB2
ISL6534
VBS2
VCC12
REFIN
VCC
REFOUT
VREF
PGOOD
FS/SYNC
DDR
SS1/EN1
SS2/EN2
SS3/EN3
GND
BOOT2
UGATE2
LGATE2
DRIVE3
FB3
PGND
VIN2 = VOUT1 (DDR)
OR OTHER
VOUT2
VIN3
VOUT3
NOTE: Not all components are necessary in all applications.
FIGURE 2. TYPICAL APPLICATION, DDRAM CONTROLLER
4 FN9134.1

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ISL6534
Typical Application, Independent Mode
VOLTAGE INPUTS REQUIRED
VCC12 (12V)
VCC (5V OR 5.8V FROM SHUNT)
VIN1, VBS1
VIN2, VBS2
VIN3
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VOUT1
ISL6534
INDEPENDENT MODE
VCC
VOLTAGE OUTPUTS
VCC12
VOUT1
VOUT2
OPTIONAL R FOR
SHUNT REGULATOR
VOUT3
VCC
VCC12
VBS1
VCC12
COMP1
FB1
BOOT1
VIN1
UGATE1
VOUT1
VOUT2
VREF (IND)
VTTREF
VREF
COMP2
LGATE1
FB2
ISL6534
VBS2
VCC12
REFIN
VCC
REFOUT
VREF
PGOOD
FS/SYNC
SS1/EN1
SS2/EN2
IND
SS3/EN3
GND
BOOT2
UGATE2
LGATE2
DRIVE3
FB3
PGND
VIN2
VIN3
VOUT2
VOUT3
NOTE: Not all components are necessary in all applications.
FIGURE 3. TYPICAL APPLICATION, INDEPENDENT MODE
5
FN9134.1