DATASHEET
ISL6228
High-Performance Dual-Output Buck Controller for Notebook Applications
The ISL6228 IC is a dual channel 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 diodes result in fewer
components and smaller implementation area.
Intersil’s R
3
technology combines the best features of fixed-
frequency and hysteretic PWMs 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, each channel of the ISL6228 has an error amplifier
that provides ±1% voltage regulation at the FB pin.
The ISL6228 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 ISL6228
operates in continuous-conduction-mode (CCM) in heavy
load, and in diode-emulation-mode (DEM) in light load to
improve light-load efficiency. In CCM, the controller always
operates as a synchronous rectifier. In DEM, the low-side
MOSFET is permitted to stay off, blocking negative current
flow into the low-side MOSFET from the output inductor.
Data Sheet
May 7, 2008
FN9095
Rev 2.00
May 7, 2008
Features
• High performance R
3
technology
• Fast transient response
• ±1% regulation accuracy: -40°C to +100°C
• Individual power stage input rail for each channel
• Wide input voltage range: +3.3V to +25V
• Output voltage range: +0.6V to +5V
• 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
- Inductor DCR overcurrent protection
- Over-temperature protection
- Fault identification by PGOOD pull-down resistance
• Pb-free (RoHS compliant)
Applications
• General purpose switching buck regulators
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adaptor
Pinout
ISL6228 (28 LD 4x4 TQFN)
PGOOD2
PHASE2
OCSET2
VO2
UGATE2
EN2
FB2
Ordering Information
21 BOOT2
20 PVCC2
19 LGATE2
28
FSET2 1
VIN2 2
VCC2 3
VCC1 4
VIN1 5
FSET1 6
PGOOD1 7
8
FB1
27
26
25 24
23
22
PART NUMBER
PART
(Note)
MARKING
ISL6228HRTZ
TEMP
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
6228HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4A
GND
18 PGND2
17 PGND1
16 LGATE1
15 PVCC1
ISL6228HRTZ-T* 6228HRTZ -10 to +100 28 Ld 4x4 TQFN L28.4x4A
Tape and Reel
ISL6228IRTZ
6228IRTZ -40 to +100 28 Ld 4x4 TQFN L28.4x4A
ISL6228IRTZ-T* 6228IRTZ -40 to +100 28 Ld 4x4 TQFN L28.4x4A
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 100% matte
tin plate PLUS ANNEAL - e3 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.
9
VO1
10
OCSET1
11 12
PHASE1
EN1
13
UGATE1
14
BOOT1
FN9095 Rev 2.00
May 7, 2008
Page 1 of 17
R
Q
S
PWM
EN2
V
COMP
C
R
100pF
EA
POR
V
REF
V
REF
EA
100pF
BOOT2
UGATE2
DRIVER
PWM CONTROL
PHASE2
SHOOT THROUGH
PROTECTION
UVP
UVP
OCP
LGATE2
DRIVER
10µA
10µA
+150°
OT
60
90
30
PACKAGE
BOTTOM
PVCC2
PGND2
PGOOD2
OCSET2
GND
OCSET1
FIGURE 1. SCHEMATIC BLOCK DIAGRAM
DIGITAL
SOFT-
START
PWM CONTROL
OVP
OVP
OCP
DRIVER
LGATE1
30
90
C
R
V
COMP
POR
DIGITAL
SOFT-
START
DRIVER
UGATE1
SHOOT THROUGH
PROTECTION
60
+150°
OT
PGOOD1
PGND1
V
R
g
m
g
m
V
W
g
m
10µA
10µA
g
m
V
W
V
R
EN1
FN9095 Rev 2.00
May 7, 2008
Page 2 of 17
Block Diagram
VIN2
FB2
VCC2
VCC1
FB1
VIN1
ISL6228
VO2
FSET2
PWM FREQUENCY
CONTROL
PWM FREQUENCY
CONTROL
VO1
FSET1
PWM
R
Q
S
BOOT1
PHASE1
PVCC1
ISL6228
Typical Application
5V
R
PGOOD2
R
PVCC2
R
VCC2
VCC2
PVCC2
VCC1
PVCC1
R
VCC1
R
PVCC1
R
PGOOD1
C
PVCC2
PGOOD2
C
VCC2
C
VCC1
C
PVCC1
PGOOD1
PGOOD2
V
IN2
VIN2
3.3V TO 25V
C
IN2
Q
HIGH_SIDE2
UGATE2
BOOT2
PGOOD1
V
IN1
VIN1
3.3V TO 25V
Q
HIGH_SIDE1
C
IN1
UGATE1
BOOT1
V
O2
0.6V TO 5V
C
O2
L
O2
C
BOOT2
PHASE2
PHASE1
C
BOOT1
L
O1
V
O1
0.6V TO 5V
C
SEN2
R
OCSET2
Q
LOW_SIDE2
ISL6228
Q
LOW_SIDE1
C
SEN1
R
OCSET1
C
O1
LGATE2
PGND2
LGATE1
PGND1
OCSET2
R
FB2
C
FB2
VO2
R
TOP2
R
O2
FB2
FSET2
R
FSET2
C
FSET2
OCSET1
VO1
R
O1
FB1
FSET1
C
FSET1
R
FSET1
R
FB1
C
FB1
R
TOP1
R
BOTTOM2
R
BOTTOM1
EN2
GND
EN1
FN9095 Rev 2.00
May 7, 2008
Page 3 of 17
ISL6228
Absolute Voltage Ratings
VIN
1,2
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
VCC, PGOOD
1,2
to GND . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
PVCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
EN
1,2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to GND, VCC +3.3V
VO
1,2
, FB
1,2
, FSET
1,2
. . . . . . . . . . . . . . -0.3V to GND, VCC +0.3V
PHASE
1,2
to GND . . . . . . . . . . . . . . . . . . . . . . . (DC) -0.3V to +28V
(<100ns Pulse Width, 10µJ) . . . . . . . . . . . . . . . . . . . . . . . . . -5.0V
BOOT
1,2
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V
BOOT
1,2
to PHASE
1,2
. . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V
UGATE
1,2
. . . . . . . . . . . . (DC) -0.3V to PHASE
1,2
, BOOT
1,2
+0.3V
(<200ns Pulse Width, 20µJ) . . . . . . . . . . . . . . . . . . . . . . . . -4.0V
LGATE
1,2
. . . . . . . . . . . . . . . . . . . (DC) -0.3V to GND, PVCC +0.3V
(<100ns Pulse Width, 4µJ) . . . . . . . . . . . . . . . . . . . . . . . . . . -2.0V
Thermal Information
Thermal Resistance (Typical, Notes 1, 2)
JA
(°C/W)
JC
(°C/W)
TQFN Package . . . . . . . . . . . . . . . . . .
40
3
Junction Temperature Range. . . . . . . . . . . . . . . . . .-55°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . .-40°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
Supply Voltage (VIN to GND) . . . . . . . . . . . . . . . . . . . . 3.3V to 25V
VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V ±5%
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.
JA
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.
2. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
3. Limits established by characterization and are not production tested.
Electrical Specifications
These specifications apply for T
A
= -40°C to +100°C; All typical specifications T
A
= +25°C, VCC = 5V,
PVCC = 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.
SYMBOL
I
VIN
TEST CONDITIONS
EN = 5V, VIN = 15V
MIN
-
-
TYP
16
0.1
MAX
-
1.0
UNIT
µA
µA
mA
mA
µA
µA
V
V
V
V
V
%
kHz
%
V
µA
µA
µA
PARAMETER
VIN
VIN Input Bias Current
VIN Shutdown Current
VCC and PVCC
VCC Input Bias Current in Single-Channel
VCC Input Bias Current in Dual Channel
VCC Shutdown Current
PVCC Shutdown Current
VCC POR THRESHOLD
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
I
VIN_SHDN
EN = GND, VIN = 25V
I
VCC_S
I
VCC_D
EN
1
= 5V, FB
1
= 0.65V, VIN
1
= 3.3V to 25V,
EN
2
= GND, FB
2
= GND, VIN
2
= GND
EN
1
= 5V, FB
1
= 0.65V, VIN
1
= 3.3V to 25V,
EN
2
= 5V, FB
2
= 0.65V, VIN
2
= 3.3V to 25V
-
-
-
-
4.33
1
2
0.1
0.1
4.45
4.45
4.20
4.20
0.6
-
-
-
-
1
7.0
0.1
-
-
1.0
1.0
4.55
4.55
4.30
4.30
-
+1
600
+12
5
-
-
-
I
VCC_SHDN
EN
1
= GND, EN
2
= GND, VCC = 5V
I
PVCC_SHDN
EN
1
= GND, EN
2
= GND, PVCC = 5V
V
VCC_THR
T
A
= -10°C to +100°C
V
VCC_THF
4.35
4.08
4.10
-
T
A
= -10°C to +100°C
V
REF
Close loop
f
SW
f
SW
= 300kHz
V
VO
I
VO
EN = 5V, VO = 0.60V
EN = 5V, VO = 5V
EN = 0V, VO = 5V
-1
200
-12
0.60
-
-
-
FN9095 Rev 2.00
May 7, 2008
Page 4 of 17
ISL6228
Electrical Specifications
These specifications apply for T
A
= -40°C to +100°C; All typical specifications T
A
= +25°C, VCC = 5V,
PVCC = 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)
SYMBOL
I
FB
FB = 0.60V
FB = 0.60V T
A
= -10°C to +100°C
POWER GOOD
PGOOD Pull-Down Impedance
R
PG_SS
R
PG_SS
R
PG_UV
R
PG_UV
R
PG_OV
R
PG_OV
R
PG_OC
R
PG_OC
PGOOD Leakage Current
PGOOD Maximum Sink Current (Note 3)
PGOOD Soft-Start Delay
GATE DRIVER
UGATE Pull-Up Resistance (Note 3)
UGATE Source Current (Note 3)
UGATE Sink Resistance (Note 3)
UGATE Sink Current (Note 3)
LGATE Pull-Up Resistance (Note 3)
LGATE Source Current (Note 3)
LGATE Sink Resistance (Note 3)
LGATE Sink Current (Note 3)
UGATE to LGATE Deadtime
LGATE to UGATE Deadtime
BOOTSTRAP DIODE
Forward Voltage
Reverse Leakage
CONTROL INPUTS
EN High Threshold
EN Low Threshold
EN Leakage
V
ENTHR
V
ENTHF
I
ENL
I
ENH
PROTECTION
OCSET-VO Threshold
OCSET 10µA Current Source
V
OCSETTHR
I
OCSET
EN = 5V
EN = 5V T
A
= -10°C to +100°C
EN = 0V
OCSET 10µA Current Source Impedance R
OCSETIMP
EN = 5V, OCSET = 1.2V
UVP Threshold
OVP Rising Threshold
OVP Falling Threshold
V
UV
V
OVR
V
OVF
-1.75
8.8
9
-
-
81
113
100
0
10
10
0
600
86
116
102
1.75
10.5
10.5
-
-
87
120
106
mV
µA
µA
µA
k
%
%
%
EN = 0V
EN = 5.0V
EN = 5.0V T
A
= -10°C to +100°C
2.0
-
-
1.4
1.5
-
-
0.1
2
2
-
1.0
1.0
2.5
2.5
V
V
µA
µA
µA
V
F
I
R
PVCC = 5V, IF = 2mA
V
R
= 25V
-
-
0.58
0.2
-
-
V
µA
R
UGPU
I
UGSRC
R
UGPD
I
UGSNK
R
LGPU
I
LGSRC
R
LGPD
I
LGSNK
t
UGFLGR
t
LGFUGR
200mA Source Current
UGATE - PHASE = 2.5V
250mA Sink Current
UGATE - PHASE = 2.5V
250mA Source Current
LGATE - PGND = 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
2.0
1.0
2.0
1.0
2.0
0.5
4.0
21
21
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 T
A
= -10°C to +100°C
PGOOD = 5mA Sink
PGOOD = 5mA Sink T
A
= -10°C to +100°C
PGOOD = 5mA Sink
PGOOD = 5mA Sink T
A
= -10°C to +100°C
PGOOD = 5mA Sink
PGOOD = 5mA Sink T
A
= -10°C to +100°C
PGOOD = 5V
70
75
70
75
45
50
22
25
-
-
2.20
95
95
95
95
63
63
32
32
0.1
5.0
2.75
125
125
125
125
85
85
45
45
1.0
-
3.50
µA
mA
ms
TEST CONDITIONS
MIN
-33
-35
TYP
-
-
MAX
15
15
UNIT
nA
nA
PARAMETER
ERROR AMPLIFIER
FB Input Bias Current
FN9095 Rev 2.00
May 7, 2008
Page 5 of 17
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