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Data Sheet
August 14, 2008
ISL62870
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FN6708.0
PWM DC/DC Voltage Regulator Controller
The ISL62870 IC is a Single-Phase Synchronous-Buck
PWM voltage regulator featuring Intersil’s Robust Ripple
Regulator (R3) Technology™. The ISL62870 provides a low
cost solution for compact high performance applications.The
wide 3.3V to 25V input voltage range is ideal for systems
that run on battery or AC adapter power sources. Resistor
programmed output voltage setpoint and capacitor
programmed soft-start delay allow for fast and easy
implementation. 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
ISL62870
(16 LD 2.6X1.8 µTQFN)
TOP VIEW
GND 1
EN 2
NC 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 to 30A
• Simple Resistor Programming for Output Voltage
• ±0.75% System Accuracy: -10°C to +100°C
• Capacitor Programming for Soft-Start Delay
• 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
Ordering Information
PART NUMBER
(Note)
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL62870HRUZ
GAL
-10 to +100
16 Ld 2.6x1.8 µTQFN
L16.2.6x1.8A
ISL62870HRUZ-T*
GAL
-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.
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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Block Diagram
FB
SREF
GND
EN
EA
+
VCOMP
100pF
+
VSET
VCC
POR
FAULT
VW
RUN
H
L
IN
PWM
RUN
DRIVER
OTP
SHOOT-THROUGH
PROTECTION
PWM RUN DRIVER
gmVIN
VCC
Cr
VR
gmVO
+
+
100kΩ
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
VREF
500mV
OVP
+
FB
UVP
+
FAULT
OCP
+
FIGURE 1. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL62870
IOCSET
10µF
VO
OCSET
PGOOD

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ISL62870
Application Schematics
RVCC
+5V
CPVCC
CVCC
GPIO
GND
EN
NC
SREF
1
2
3
4
BOOT
12
UGATE
11
PHASE
10
OCSET
9
CBOOT
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QHS
QLS
VIN
3.3V TO 25V
CINC
CINB
LO
COCSET
VOUT
0.5V TO 3.3V
COC
COB
GPIO
VCC
RCOMP
CCOMP
RO
RFB
FIGURE 2. ISL62870 APPLICATION SCHEMATIC WITH DCR CURRENT SENSE
+5V
GPIO
GPIO
RVCC
CPVCC
GND
EN
NC
SREF
1
2
3
4
VCC
CVCC
BOOT
12
UGATE
11
PHASE
10
OCSET
9
CBOOT
QHS
LO
QLS
RCOMP
CCOMP
VIN
3.3V TO 25V
CINC
CINB
RSNS
COCSET
VOUT
0.5V TO 3.3V
COC
COB
RO
RFB
FIGURE 3. ISL62870 APPLICATION SCHEMATIC WITH RESISTOR CURRENT SENSE
3 FN6708.0
August 14, 2008

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ISL62870
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, VO, 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
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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)
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
- .1 - µA
FB Input Bias Current
SREF
IFB EN = 5V, FB = 0.50V
-20 - +50 nA
SREF Voltage
Soft-Start Current
VSREF
ISS
- 0.5 -
V
10 20 30 µA
4 FN6708.0
August 14, 2008

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ISL62870
Electrical Specifications
These specifications apply for TA = -10°C to +100°C, unless otherwise stated. All twypwicwal.DspaetaciSfihcaeteiotn4sU.com
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. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
POWER GOOD
PGOOD Pull-down Impedance
PGOOD Leakage Current
PGOOD Maximum Sink Current (Note 2)
GATE DRIVER
RPG_SS
RPG_UV
RPG_OV
RPG_OC
IPG
IPG_max
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5V
75 95 150 Ω
75 95 150 Ω
50 65 90 Ω
25 35 50 Ω
- 0.1 1.0 μA
- 5.0 - mA
UGATE Pull-Up Resistance (Note 2)
UGATE Source Current (Note 2)
UGATE Sink Resistance (Note 2)
UGATE Sink Current (Note 2)
LGATE Pull-Up Resistance (Note 2)
LGATE Source Current (Note 2)
LGATE Sink Resistance (Note 2)
LGATE Sink Current (Note 2)
UGATE to LGATE Deadtime
LGATE to UGATE Deadtime
PHASE
RUGPU
IUGSRC
RUGPD
IUGSNK
RLGPU
ILGSRC
RLGPD
ILGSNK
tUGFLGR
tLGFUGR
200mA Source Current
UGATE - PHASE = 2.5V
250mA Sink Current
UGATE - PHASE = 2.5V
250mA Source Current
LGATE - GND = 2.5V
250mA Sink Current
LGATE - PGND = 2.5V
UGATE falling to LGATE rising, no load
LGATE falling to UGATE rising, no load
-
1.0 1.5
Ω
- 2.0 -
A
-
1.0 1.5
Ω
- 2.0 -
A
-
1.0 1.5
Ω
- 2.0 -
A
-
0.5 0.9
Ω
- 4.0 -
A
- 21 - ns
- 21 - ns
PHASE Input Impedance
BOOTSTRAP DIODE
RPHASE
- 33 - kΩ
Forward Voltage
Reverse Leakage
CONTROL INPUTS
VF PVCC = 5V, IF = 2mA
IR VR = 25V
- 0.58 -
- 0.2 -
V
µA
EN High Threshold Voltage
EN Low Threshold Voltage
EN Input Bias Current
EN Leakage Current
PROTECTION
VENTHR
VENTHF
IEN
IENoff
EN = 5V
EN = GND
2.0 -
-V
- - 1.0 V
1.5 2.0 2.5 µA
- 0.1 1.0 µA
OCP Threshold Voltage
VOCPTH VOCSET - VO
OCP Reference Current
IOCP EN = 5.0V
OCSET Input Resistance
ROCSET EN = 5.0V
OCSET Leakage Current
IOCSET EN = GND
UVP Threshold Voltage
VUVTH VFB = %VSREF
OVP Rising Threshold Voltage
VOVRTH VFB = %VSREF
OVP Falling Threshold Voltage
VOVFTH VFB = %VSREF
OTP Rising Threshold Temperature (Note 2) TOTRTH
OTP Hysteresis (Note 2)
TOTHYS
NOTE:
2. Limits established by characterization and are not production tested.
-1.75 -
1.75 mV
9.0 10 11 µA
- 600 - kΩ
- 0 - µA
81 84 87 %
113 116 120
%
100 102 106
%
- 150 -
°C
- 25 - °C
5 FN6708.0
August 14, 2008