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®
Data Sheet
June 30, 2009
ISL62873
www.DataSheet4U.com
FN6930.0
PWM DC/DC Controller with VID Inputs for
Portable GPU Core-Voltage Regulator
The ISL62873 is a Single-Phase Synchronous-Buck PWM
voltage regulator 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 ISL62873 is a low-cost solution 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 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.
Pinout
ISL62873
(16 LD 2.6X1.8 µTQFN)
TOP VIEW
GND 1
EN 2
VID0 3
SREF 4
12 BOOT
11 UGATE
10 PHASE
9 OCSET
Features
• Input Voltage Range: 3.3V to 25V
• Output Voltage Range: 0.5V to 3.3V
• Output Load up to 30A
• Flexible Output Voltage Programmability
- 1-Bit VID 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
- 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
Ordering Information
PART
NUMBER
(Note)
TEMP
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL62873HRUZ-T* -10 to +100 16 Ld 2.6x1.8 µTQFN L16.2.6x1.8A
Tape and Reel
*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.
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. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Block Diagram
FB
SREF
SET0
VID0
GND
EN VCC
POR
100kΩ
EA
+
VCOMP
100pF
+
VSET
SW0
SW1
FAULT
VW
RUN
H
L
IN
PWM
RUN
DRIVER
OTP
SHOOT-THROUGH
PROTECTION
PWM RUN DRIVER
gmVIN
VCC
Cr
VR
gmVO
+
+
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
VID DECODER
INT
500mV
EXT
SW4
VREF
FB
UVP
+
FAULT
OCP
+
FIGURE 1. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL62873
IOCSET
10µF
VO
OCSET
PGOOD

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Application Schematics
RVCC
+5V
CPVCC
GPIO
GND
EN
VID0
SREF
1
2
3
4
ISL62873
www.DataSheet4U.com
CVCC
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 2. ISL62873 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 3. ISL62873 APPLICATION SCHEMATIC WITH TWO OUTPUT VOLTAGE SETPOINTS AND RESISTOR CURRENT SENSE
3 FN6930.0
June 30, 2009

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Application Schematics (Continued)
RVCC
+5V
CPVCC
ISL62873
CVCC
GPIO
EXT_REF
GND
EN
VID0
SREF
1
2
3
4
VCC
BOOT
12
UGATE
11
PHASE
10
OCSET
9
CBOOT
QHS
QLS
LO
COCSET
RCOMP
CCOMP
RO
www.DataSheet4U.com
VIN
3.3V TO 25V
CINC
CINB
VOUT
0.5V TO 3.3V
COC
COB
GPIO
RFB
FIGURE 4. ISL62873 APPLICATION SCHEMATIC WITH EXTERNAL REFERENCE INPUT AND DCR CURRENT SENSE
4 FN6930.0
June 30, 2009

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ISL62873
www.DataSheet4U.com
Absolute Maximum Ratings
VCC, PVCC, PGOOD to GND . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
VCC, PVCC to PGND . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
GND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
EN, SET0, VO,
VID0, FB, OCSET, SREF. . . . . . . . . . . . -0.3V to GND, VCC + 0.3V
BOOT Voltage (VBOOT-GND). . . . . . . . . . . . . . . . . . . . . -0.3V to 33V
BOOT To PHASE Voltage (VBOOT-PHASE) . . . . . . -0.3V to 7V (DC)
-0.3V to 9V (<10ns)
PHASE Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 28V
GND -8V (<20ns Pulse Width, 10µJ)
UGATE Voltage . . . . . . . . . . . . . . . . VPHASE - 0.3V (DC) to VBOOT
VPHASE - 5V (<20ns Pulse Width, 10µJ) to VBOOT
LGATE Voltage . . . . . . . . . . . . . . . GND - 0.3V (DC) to VCC + 0.3V
GND - 2.5V (<20ns Pulse Width, 5µJ) to VCC + 0.3V
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (°C/W)
16 Ld µTQFN Package . . . . . . . . . . . . . . . . . . . . . .
84
Junction Temperature Range. . . . . . . . . . . . . . . . . .-55°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range. . . . . . . . . . . . . . . . . .-10°C to +100°C
Converter Input Voltage to GND . . . . . . . . . . . . . . . . . . 3.3V to 25V
VCC, PVCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V ±5%
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
Electrical Specifications
These specifications apply for TA = -10°C to +100°C, unless otherwise stated.
All typical specifications TA = +25°C, VCC = 5V. Parameters with MIN and/or MAX limits are 100% tested at
+25°C, unless otherwise specified. Temperature limits established by characterization and are not production
tested.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
VCC and PVCC
VCC Input Bias Current
VCC Shutdown Current
PVCC Shutdown Current
VCC POR THRESHOLD
IVCC
IVCCoff
IPVCCoff
EN = 5V, VCC = 5V, FB = 0.55V, SREF < FB
EN = GND, VCC = 5V
EN = GND, PVCC = 5V
- 1.1 1.5 mA
- 0.1 1.0 µA
- 0.1 1.0 µA
Rising VCC POR Threshold Voltage
Falling VCC POR Threshold Voltage
REGULATION
VVCC_THR
VVCC_THF
4.40
4.10
4.49
4.22
4.60
4.35
V
V
Reference Voltage
System Accuracy
VREF(int)
VID0 = VID1 = GND, PWM Mode = CCM
- 0.50 -
-0.75 - +0.75
V
%
PWM
Switching Frequency
VO
FSW PWM Mode = CCM
270 300 330 kHz
VO Input Voltage Range
VO Input Impedance
VO Reference Offset Current
VO Input Leakage Current
ERROR AMPLIFIER
VVO
RVO
IVOSS
IVOoff
EN = 5V
VENTHR < EN, SREF = Soft-Start Mode
EN = GND, VO = 3.6V
0 - 3.6 V
- 600 - kΩ
- 10 - µA
- 0.1 - µA
FB Input Bias Current
SREF
IFB EN = 5V, FB = 0.50V
-20 - +50 nA
SREF Operating Voltage Range
Soft-Start Current
Voltage Step Current
VSREF
ISS
IVS
Nominal SREF Setting with 1% Resistors
SREF = Soft-Start Mode
SREF = Setpoint-Stepping Mode
0.5 - 1.5 V
10 20 30 µA
±60 ±100 ±140 µA
5 FN6930.0
June 30, 2009