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®
Data Sheet
August 22, 2006
ISL6268
FN6348.0
High-Performance Notebook PWM
Controller
The ISL6268 IC is a Single-Phase Synchronous-Buck PWM
controller featuring Intersil's Robust Ripple Regulator (R3)
technology that delivers truly superior dynamic response to
input voltage and output load transients. Integrated
MOSFET drivers and bootstrap diode result in fewer
components and smaller implementation area.
Intersil’s R3 technology combines the best features of
fixed-frequency PWM and hysteretic PWM while eliminating
many of their shortcomings. R3 technology employs an
innovative modulator that synthesizes an AC ripple voltage
signal VR, analogous to the output inductor ripple current. The
AC signal VR enters a window comparator where the lower
threshold is the error amplifier output VCOMP, and the upper
threshold is a programmable voltage reference VW, resulting
in generation of the PWM signal. The voltage reference VW
sets the steady-state PWM frequency. Both edges of the
PWM can be modulated in response to input voltage
transients and output load transients, much faster than
conventional fixed-frequency PWM controllers. Unlike a
conventional hysteretic converter, the ISL6268 has an error
amplifier that provides ±1% voltage regulation at the FB pin.
The ISL6268 has a 1.5ms digital soft-start and can be
started into a pre-biased output voltage. A resistor divider is
used to program the output voltage setpoint. The ISL6268
normally operates in continuous-conduction-mode (CCM),
automatically entering diode-emulation-mode (DEM) at low
load for optimum efficiency. In CCM the converter operates
as a synchronous rectifier. In DEM the low-side MOSFET
stays off, blocking negative current flow from the output
inductor.
Pinout
ISL6268 (16 LD SSOP)
TOP VIEW
PHASE 1
PGOOD 2
VIN 3
VCC 4
EN 5
COMP 6
FB 7
GND 8
16 UG
15 BOOT
14 PVCC
13 LG
12 PGND
11 ISEN
10 VO
9 FSET
Features
• High performance R3 technology
• Fast transient response
• ±1% regulation accuracy: -10°C to +100°C
• Wide input voltage range: +7.0V to +25.0V
• Output voltage range: +0.6V to +3.3V
• Wide output load range: 0A to 25A
• Diode emulation mode for increased light load efficiency
• Programmable PWM frequency: 200kHz to 600kHz
• Pre-biased output start-up capability
• Integrated MOSFET drivers and bootstrap diode
• Internal digital soft-start
• Power good monitor
• Fault protection
- Undervoltage protection
- Soft crowbar overvoltage protection
- Low-side MOSFET r DS(on) overcurrent protection
- Over-temperature protection
- Fault identification by PGOOD pull-down resistance
• Pb-free plus anneal available (RoHS compliant)
Applications
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adapter
Ordering Information
PART
PART
PKG.
NUMBER MARKING TEMP (°C) PACKAGE DWG. #
ISL6268CAZ 6268CAZ -10 to +100 16 Ld QSOP M16.15A
(Note)
(Pb-free)
ISL6268CAZ-T 6268CAZ 16 Ld QSOP Tape and
(Note)
Reel (Pb-free)
M16.15A
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding 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-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. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Block Diagram
VIN
GND
VCC
EN
VREF
OVP
UVP
FB
COMP
ISEN
+
EA
OCP
IOC
PGOOD
+
gmVIN
+
gmVO
PWM FREQUENCY
CONTROL
+
VW
+
+
CR
VR
VCOMP
+
VO
FSET
PWM
R
Q
S
BOOT
POR
DIGITAL SOFT-START
309060
150°OT
DRIVER
SHOOT THROUGH
PROTECTION
DRIVER
UG
PHASE
PVCC
LG
PGND
FIGURE 1. SCHEMATIC BLOCK DIAGRAM

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Typical Application
RPGOOD
ISL6268
ISL6268
PGOOD
VIN
5V
PVCC
RVCC
VCC
CPVCC
CVCC
GND
QHIGH_SIDE
UG
BOOT
PHASE
ISEN
CBOOT
RSEN
LOUT
VIN
7V- 25V
CIN
VOUT
0.6V- 3.3V
COUT
QLOW_SIDE
EN LG
RCOMP
COMP
PGND
CCOMP1
CCOMP2
FB FSET
VO
RBOTTOM
RTOP
RFSET
CFSET
3 FN6348.0
August 22, 2006

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ISL6268
Absolute Voltage Ratings
ISEN, VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
VCC, PGOOD to GND . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
PVCC to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
GND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to GND, VCC +3.3V
VO, FB, COMP, FSET . . . . . . . . . . . . . . . -0.3V to GND, VCC +0.3V
PHASE to GND (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
(<100ns Pulse Width, 10µJ) . . . . . . . . . . . . . . . . . . . . . . . . . -5.0V
BOOT to GND, or PGND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V
BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V
UG (DC) . . . . . . . . . . . . . . . . . . . . . . .-0.3V to PHASE, BOOT +0.3V
(<200ns Pulse Width, 20µJ) . . . . . . . . . . . . . . . . . . . . . . . . -4.0V
LG (DC) . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to PGND, PVCC +0.3V
(<100ns Pulse Width, 4µJ) . . . . . . . . . . . . . . . . . . . . . . . . . . -2.0V
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (°C/W)
QSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .
105
Junction Temperature Range. . . . . . . . . . . . . . . . . .-55°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . +300°C
Recommended Operating Conditions
Ambient Temperature Range. . . . . . . . . . . . . . . . . .-10°C to +100°C
Supply Voltage (VIN to GND) . . . . . . . . . . . . . . . . . . . . . . 7V to 25V
VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V ±5%
PVCC to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V ±5%
CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational section of this specification is not implied.
NOTES:
1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
PARAMETER
These specifications apply for TA = -10°C to +100°C, unless otherwise stated.
All typical specifications TA = +25°C, VCC = 5V, PVCC = 5V
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
VIN
VIN Input Bias Current
VIN Shutdown Current
VCC and PVCC
VCC Input Bias Current
VCC Shutdown Current
PVCC Shutdown Current
VCC POR THRESHOLD
IVIN EN = 5V, VIN = 7V
EN = 5V, VIN = 25V
IVIN_SHDN EN = GND, VIN = 25V
IVCC EN = 5V, FB = 0.65V, VIN = 7V to 25V
IVCC_SHDN EN = GND, VCC = 5V
IPVCC_SHDN EN = GND, PVCC = 5V
- 6.5 10 µA
- 26 35 µA
- 0.1 1.0 µA
- 1.7 2.5 mA
- 0.1 1.0 µA
- 0.1 1.0 µA
Rising VCC POR Threshold Voltage
Falling VCC POR Threshold Voltage
REGULATION
Reference Voltage
Regulation Accuracy
VVCC_THR
VVCC_THF
VREF
FB connected to COMP
4.35
4.10
4.45
4.20
4.55
4.30
V
V
- 0.6 -
V
-1 - +1 %
PWM
Frequency Range
Frequency-Set Accuracy
VO Range
VO Input Leakage
FSW
VVO
IVO
FSW = 300kHz
VO = 0.60V
VO = 3.30V
200 - 600 kHz
-12 - +12 %
0.60 - 3.30 V
- 1.3 - µA
- 7.0 - µA
ERROR AMPLIFIER
FB Input Bias Current
COMP Source Current
COMP Sink Current
COMP High Clamp Voltage
COMP Low Clamp Voltage
IFB FB = 0.60V
ICOMP_SRC FB = 0.40V, COMP = 3.20V
ICOMP_SNK FB = 0.80V, COMP = 0.30V
VCOMP_HC FB = 0.40V, Sink 50µA
VCOMP_LC FB = 0.80V, Source 50µA
-0.5 - +0.5
- 2.5 -
- 0.3 -
3.10 3.40 3.65
0.09 0.15 0.21
µA
mA
mA
V
V
4 FN6348.0
August 22, 2006

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ISL6268
Electrical Specifications
PARAMETER
These specifications apply for TA = -10°C to +100°C, unless otherwise stated.
All typical specifications TA = +25°C, VCC = 5V, PVCC = 5V (Continued)
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
POWER GOOD
PGOOD Pull-Down Impedance
PGOOD Leakage Current
PGOOD Maximum Sink Current (Note 2)
RPG_SS
RPG_UV
RPG_OV
RPG_OC
IPGOOD
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5V
75 95 125
75 95 125
50 63 85
25 32 45
- 0.1 1.0 µA
- 5.0 - mA
PGOOD Soft-Start Delay
GATE DRIVER
UG Pull-Up Resistance
UG Source Current (Note 2)
UG Sink Resistance
UG Sink Current (Note 2)
LG Pull-Up Resistance
LG Source Current (Note 2)
LG Sink Resistance
LG Sink Current (Note 2)
UG to LG Deadtime
LG to UG Deadtime
BOOTSTRAP DIODE
Forward Voltage
Reverse Leakage
CONTROL INPUTS
EN High Threshold
EN Low Threshold
EN Leakage
PROTECTION
TSS EN High to PGOOD High
RUGPU
IUGSRC
RUGPD
IUGSNK
RLGPU
ILGSRC
RLGPD
ILGSNK
tUGFLGR
tLGFUGR
200mA Source Current
UG - PHASE = 2.5V
250mA Sink Current
UG - PHASE = 2.5V
250mA Source Current
LG - PGND = 2.5V
250mA Sink Current
LG - PGND = 2.5V
UG falling to LG rising, no load
LG falling to UG rising, no load
VF PVCC = 5V, IF = 2mA
IR VR = 25V
VENTHR
VENTHF
IENL
IENH
EN = 0V
EN = 5.0V
2.20 2.75 3.30 ms
-
1.0 1.5
- 2.0 -
A
-
1.0 1.5
- 2.0 -
A
-
1.0 1.5
- 2.0 -
A
-
0.5 0.9
- 4.0 -
A
- 21 - ns
- 14 - ns
- 0.58 -
- 0.2 -
V
µA
2.0 -
-V
- - 1.0 V
- 0.1 1.0 µA
- 0.1 1.0 µA
ISEN OCP Threshold
ISEN Short-Circuit Threshold
UVP Threshold
OVP Rising Threshold
OVP Falling Threshold
OTP Rising Threshold (Note 2)
OTP Hysteresis (Note 2)
NOTE:
2. Guaranteed by characterization.
IOC
ISC
VUV
VOVR
VOVF
TOTR
TOTHYS
ISEN sourcing
ISEN sourcing
19 26 33
- 50 -
81 84 87
113 116 119
100 103 106
- 150 -
- 25 -
µA
µA
%
%
%
°C
°C
5 FN6348.0
August 22, 2006