DATASHEET
ISL6268
High-Performance Notebook PWM Controller
The ISL6268 IC is a Single-Phase Synchronous-Buck PWM
controller featuring Intersil's Robust Ripple Regulator (R
3
)
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 R
3
technology combines the best features of
fixed-frequency PWM and hysteretic PWM while eliminating
many of their shortcomings. R
3
technology employs an
innovative modulator that synthesizes an AC ripple voltage
signal V
R
, analogous to the output inductor ripple current. The
AC signal V
R
enters a window comparator where the lower
threshold is the error amplifier output V
COMP
, and the upper
threshold is a programmable voltage reference V
W,
resulting
in generation of the PWM signal. The voltage reference V
W
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.
FN6348
Rev 0.00
Aug 22, 2006
Features
• High performance R
3
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
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
• Network adapter
Ordering Information
PART
NUMBER
ISL6268CAZ
(Note)
PART
MARKING TEMP (°C)
6268CAZ
PACKAGE
PKG.
DWG. #
-10 to +100 16 Ld QSOP M16.15A
(Pb-free)
16 Ld QSOP Tape and
Reel (Pb-free)
M16.15A
ISL6268CAZ-T 6268CAZ
(Note)
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.
FN6348 Rev 0.00
Aug 22, 2006
Page 1 of 14
V
REF
EN
g
m
V
IN
V
W
PWM
OVP
UVP
EA
FB
COMP
ISEN
I
OC
DRIVER
POR
DIGITAL SOFT-START
PWM CONTROL
PHASE
SHOOT THROUGH
PROTECTION
PVCC
UG
OCP
30
90
PGOOD
FIGURE 1. SCHEMATIC BLOCK DIAGRAM
g
m
V
O
C
R
V
COMP
BOOT
60
DRIVER
150°OT
PGND
V
R
FN6348 Rev 0.00
Aug 22, 2006
Page 2 of 14
Block Diagram
VIN
VO
GND
PWM FREQUENCY
CONTROL
FSET
ISL6268
VCC
R
Q
S
ISL6268
LG
ISL6268
Typical Application
ISL6268
V
IN
7V-25V
PGOOD
VIN
R
PGOOD
C
IN
5V
PVCC
UG
Q
HIGH_SIDE
R
VCC
VCC
BOOT
C
PVCC
C
VCC
C
BOOT
GND
PHASE
L
OUT
V
OUT
0.6V-3.3V
R
SEN
ISEN
C
OUT
Q
LOW_SIDE
EN
LG
R
COMP
COMP
PGND
C
COMP1
FB
C
COMP2
R
BOTTOM
R
TOP
VO
FSET
R
FSET
C
FSET
FN6348 Rev 0.00
Aug 22, 2006
Page 3 of 14
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, 10J) . . . . . . . . . . . . . . . . . . . . . . . . . -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, 20J) . . . . . . . . . . . . . . . . . . . . . . . . -4.0V
LG (DC) . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to PGND, PVCC +0.3V
(<100ns Pulse Width, 4J) . . . . . . . . . . . . . . . . . . . . . . . . . . -2.0V
Thermal Information
Thermal Resistance (Typical, Note 1)
JA
(°C/W)
QSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .
105
Junction Temperature Range. . . . . . . . . . . . . . . . . .-55C to +150C
Operating Temperature Range . . . . . . . . . . . . . . . .-10C to +100C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65C to +150C
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . +300C
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.
JA
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
VIN
VIN Input Bias Current
VIN Shutdown Current
VCC and PVCC
VCC Input Bias Current
VCC Shutdown Current
PVCC Shutdown Current
VCC POR THRESHOLD
These specifications apply for T
A
= -10°C to +100°C, unless otherwise stated.
All typical specifications T
A
= +25°C, VCC = 5V, PVCC = 5V
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
I
VIN
EN = 5V, VIN = 7V
EN = 5V, VIN = 25V
-
-
-
6.5
26
0.1
10
35
1.0
A
A
A
I
VIN_SHDN
EN = GND, VIN = 25V
I
VCC
EN = 5V, FB = 0.65V, VIN = 7V to 25V
-
-
-
1.7
0.1
0.1
2.5
1.0
1.0
mA
A
A
I
VCC_SHDN
EN = GND, VCC = 5V
I
PVCC_SHDN
EN = GND, PVCC = 5V
V
VCC_THR
V
VCC_THF
Rising VCC POR Threshold Voltage
Falling VCC POR Threshold Voltage
REGULATION
Reference Voltage
Regulation Accuracy
PWM
Frequency Range
Frequency-Set Accuracy
VO Range
VO Input Leakage
ERROR AMPLIFIER
FB Input Bias Current
COMP Source Current
COMP Sink Current
COMP High Clamp Voltage
COMP Low Clamp Voltage
4.35
4.10
4.45
4.20
4.55
4.30
V
V
V
REF
FB connected to COMP
-
-1
0.6
-
-
+1
V
%
F
SW
F
SW
= 300kHz
V
VO
I
VO
VO = 0.60V
VO = 3.30V
200
-12
0.60
-
-
-
-
-
1.3
7.0
600
+12
3.30
-
-
kHz
%
V
A
A
I
FB
FB = 0.60V
-0.5
-
-
3.10
0.09
-
2.5
0.3
3.40
0.15
+0.5
-
-
3.65
0.21
A
mA
mA
V
V
I
COMP_SRC
FB = 0.40V, COMP = 3.20V
I
COMP_SNK
FB = 0.80V, COMP = 0.30V
V
COMP_HC
FB = 0.40V, Sink 50A
V
COMP_LC
FB = 0.80V, Source 50A
FN6348 Rev 0.00
Aug 22, 2006
Page 4 of 14
ISL6268
Electrical Specifications
PARAMETER
POWER GOOD
R
PG_SS
PGOOD Pull-Down Impedance
R
PG_UV
R
PG_OV
R
PG_OC
PGOOD Leakage Current
PGOOD Maximum Sink Current (Note 2)
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
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.
I
OC
I
SC
V
UV
V
OVR
V
OVF
T
OTR
T
OTHYS
ISEN sourcing
ISEN sourcing
19
-
81
113
100
-
-
26
50
84
116
103
150
25
33
-
87
119
106
-
-
A
A
%
%
%
°C
°C
V
ENTHR
V
ENTHF
I
ENL
I
ENH
EN = 0V
EN = 5.0V
2.0
-
-
-
-
-
0.1
0.1
-
1.0
1.0
1.0
V
V
A
A
V
F
I
R
PVCC = 5V, IF = 2mA
V
R
= 25V
-
-
0.58
0.2
-
-
V
A
R
UGPU
I
UGSRC
R
UGPD
I
UGSNK
R
LGPU
I
LGSRC
R
LGPD
I
LGSNK
t
UGFLGR
t
LGFUGR
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
-
-
-
-
-
-
-
-
-
-
1.0
2.0
1.0
2.0
1.0
2.0
0.5
4.0
21
14
1.5
-
1.5
-
1.5
-
0.9
-
-
-
A
A
A
A
ns
ns
T
SS
EN High to PGOOD High
I
PGOOD
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5mA Sink
PGOOD = 5V
75
75
50
25
-
-
2.20
95
95
63
32
0.1
5.0
2.75
125
125
85
45
1.0
-
3.30
A
mA
ms
These specifications apply for T
A
= -10°C to +100°C, unless otherwise stated.
All typical specifications T
A
= +25°C, VCC = 5V, PVCC = 5V
(Continued)
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
FN6348 Rev 0.00
Aug 22, 2006
Page 5 of 14
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