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Data Sheet
ISL62871, ISL62872
August 14, 2008
www.DataSheet4U.com
FN6707.0
PWM DC/DC Controller With VID Inputs
For Portable GPU Core-Voltage Regulator
The ISL62871 and ISL62872 IC’s are Single-Phase
Synchronous-Buck PWM voltage regulators featuring
Intersil’s Robust Ripple Regulator (R3) Technology™. The
wide 3.3V to 25V input voltage range is ideal for systems
that run on battery or AC-adapter power sources. The
ISL62871 and ISL62872 are low-cost solutions for
applications requiring dynamically selected slew-rate
controlled output voltages. The soft-start and dynamic
setpoint slew-rates are capacitor programmed. Voltage
identification logic-inputs select two (ISL62871) or four
(ISL62872) resistor-programmed setpoint reference voltages
that directly set the output voltage of the converter between
0.5V to 1.5V, and up to 3.3V using a feedback voltage
divider. Optionally, an external reference such as the DAC
output from a microcontroller, can be used by either IC to
program the setpoint reference voltage, and still maintain the
controlled slew-rate features. Robust integrated MOSFET
drivers and Schottky bootstrap diode reduce the
implementation area and lower component cost.
Intersil’s R3 Technology™ combines the best features of
both fixed-frequency and hysteretic PWM control. The PWM
frequency is 300kHz during static operation, becoming
variable during changes in load, setpoint voltage, and input
voltage when changing between battery and AC-adapter
power. The modulators ability to change the PWM switching
frequency during these events in conjunction with external
loop compensation produces superior transient response.
For maximum efficiency, the converter automatically enters
diode-emulation mode (DEM) during light-load conditions
such as system standby.
Features
• Input Voltage Range: 3.3V to 25V
• Output Voltage Range: 0.5V to 3.3V
• Output Load up to 30A
• Extremely Flexible Output Voltage Programmability
- 2-Bit VID (ISL62872) Selects Four Independent
Setpoint Voltages
- 1-Bit VID (ISL62871) Selects Two Independent Setpoint
Voltages
- Simple Resistor Programming of Setpoint Voltages
- Accepts External Setpoint Reference Such as DAC
• ±0.75% System Accuracy: -10°C to +100°C
• One Capacitor Programs Soft-start and Setpoint Slew-rate
• Fixed 300kHz PWM Frequency in Continuous Conduction
• External Compensation Affords Optimum Control Loop
Tuning
• Automatic Diode Emulation Mode for Highest Efficiency
• Integrated High-current MOSFET Drivers and Schottky
Boot-Strap Diode for Optimal Efficiency
• Choice of Overcurrent Detection Schemes
- Lossless Inductor DCR Current Sensing
- Precision Resistive Current Sensing
• Power-Good Monitor for Soft-Start and Fault Detection
• Fault Protection
- Undervoltage
- Overvoltage
- Overcurrent (DCR-Sense or Resistive-Sense
Capability)
- Over-Temperature Protection
- Fault Identification by PGOOD Pull-Down Resistance
• Pb-Free (RoHS compliant)
Applications
• Mobile PC Graphical Processing Unit VCC rail
• Mobile PC I/O Controller Hub (ICH) VCC rail
• Mobile PC Memory Controller Hub (GMCH) VCC rail
• Built-in voltage margin for system-level test
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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Pinouts
ISL62872
(20 LD 3.2X1.8 µTQFN)
TOP VIEW
ISL62871, ISL62872
www.DataSheet4U.com
ISL62871
(16 LD 2.6X1.8 µTQFN)
TOP VIEW
PGND 2
GND 3
EN 4
VID1 5
VID0 6
SREF 7
SET0 8
SET1 9
19 VCC
18 BOOT
17 UGATE
16 PHASE
15 NC
14 OCSET
13 VO
12 FB
GND 1
EN 2
VID0 3
SREF 4
12 BOOT
11 UGATE
10 PHASE
9 OCSET
Ordering Information
PART NUMBER
(Note)
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL62872HRUZ
GAN
-10 to +100
20 Ld 3.2x1.8 µTQFN
L20.3.2x1.8
ISL62872HRUZ -T*
GAN
-10 to +100
20 Ld 3.2x1.8 µTQFN
L20.3.2x1.8
ISL62871HRUZ
GAM
-10 to +100
16 Ld 2.6x1.8 µTQFN
L16.2.6x1.8A
ISL62871HRUZ -T*
GAM
-10 to +100
16 Ld 2.6x1.8 µTQFN
L16.2.6x1.8A
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and
NiPdAu plate - e4 termination finish, which is 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-020.
2 FN6707.0
August 14, 2008

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Block Diagram
FB
SREF
SET0
*SET1
*SET2
*VID1
VID0
GND
EN VCC
POR
100kΩ
EA
+
VCOMP
100pF
+
VSET
SW0
SW1
SW2
SW3
VID DECODER
*ISL62872 ONLY EXT
INT
500mV
SW4
VREF
FAULT
VW
RUN
H
L
IN
PWM
RUN
DRIVER
OTP
SHOOT-THROUGH
PROTECTION
PWM
RUN DRIVER
gmVIN
VCC
Cr
VR
gmVO
+
+
OVP
+
FB
UVP
+
FAULT
OCP
+
IOCSET
10µF
FIGURE 1. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL62872, ISL62871
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
VO
OCSET
PGOOD

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Application Schematics
RVCC
+5V
GPIO
CPVCC
PGND
GND
EN
VID1
VID0
SREF
SET0
SET1
2
3
4
5
6
7
8
9
RSET1 RSET2 RSET3
ISL62871, ISL62872
www.DataSheet4U.com
VCC
19
BOOT
18
UGATE
17
PHASE
16
NC
15
OCSET
14
VO
13
FB
12
VCC
CVCC
CBOOT
QHS
QLS
LO
COCSET
RCOMP
CCOMP
RO
VIN
3.3V TO 25V
CINC
CINB
VOUT
0.5V TO 3.3V
COC
COB
GPIO
RFB
FIGURE 2. ISL62872 APPLICATION SCHEMATIC WITH FOUR OUTPUT VOLTAGE SETPOINTS AND DCR CURRENT SENSE
+5V
GPIO
RVCC
CPVCC
PGND
GND
EN
VID1
VID0
SREF
SET0
SET1
2
3
4
5
6
7
8
9
RSET1 RSET2 RSET3
VCC
19
BOOT
18
UGATE
17
PHASE
16
NC
15
OCSET
14
VO
13
FB
12
VCC
CVCC
CBOOT
QHS
LO
QLS
VIN
3.3V TO 25V
CINC
CINB
RSNS
COCSET
VOUT
0.5V TO 3.3V
COC
COB
RCOMP
CCOMP
RO
GPIO
RFB
FIGURE 3. ISL62872 APPLICATION SCHEMATIC WITH FOUR OUTPUT VOLTAGE SETPOINTS AND RESISTOR CURRENT SENSE
4 FN6707.0
August 14, 2008

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ISL62871, ISL62872
Application Schematics (Continued)
www.DataSheet4U.com
+5V
GPIO
RVCC
CPVCC
CVCC
GND
EN
VID0
SREF
1
2
3
4
BOOT
12
UGATE
11
PHASE
10
OCSET
9
CBOOT
QHS
QLS
VIN
3.3V TO 25V
CINC
CINB
LO
COCSET
VOUT
0.5V TO 3.3V
COC
COB
RSET1
VCC
RCOMP
CCOMP
RO
RFB
GPIO
FIGURE 4. ISL62871 APPLICATION SCHEMATIC WITH TWO OUTPUT VOLTAGE SETPOINTS AND DCR CURRENT SENSE
+5V
GPIO
RVCC
CPVCC
CVCC
GND
EN
VID0
SREF
1
2
3
4
BOOT
12
UGATE
11
PHASE
10
OCSET
9
CBOOT
QHS
LO
QLS
VIN
3.3V TO 25V
CINC
CINB
RSNS
COCSET
VOUT
0.5V TO 3.3V
COC
COB
RSET1
VCC
RCOMP
CCOMP
RO
RFB
GPIO
FIGURE 5. ISL62871 APPLICATION SCHEMATIC WITH TWO OUTPUT VOLTAGE SETPOINTS AND RESISTOR CURRENT SENSE
5 FN6707.0
August 14, 2008