DATASHEET
ISL8104
FN9257
Rev 2.00
March 7, 2008
8V to 14V, Single-Phase Synchronous Buck Pulse-Width Modulation (PWM)
Controller With Integrated Gate Drivers
The ISL8104 is a 8V to 14V synchronous PWM controller
with integrated MOSFET drivers. The controller features the
ability to safely start-up into prebiased output loads and
provides protection against overcurrent fault events.
Overcurrent protection is implemented using top-side
MOSFET rDS(ON) sensing, eliminating the need for a current
sensing resistor.
Features
The ISL8104 employs voltage-mode control with dual-edge
modulation to achieve fast transient response. The operating
frequency is adjustable from 50kHz to 1.5MHz with full (0%
to 100%) PWM duty cycle capability. The error amplifier
features a 15MHz (typ) gain-bandwidth product and 6V/µs
slew rate enabling high converter bandwidth.
• Voltage-Mode PWM Control with Dual-Edge Modulation
The output voltage of the converter can be regulated to as
low as 0.597V with a tolerance of ±1.0% over the
commercial temperature range (0°C to +70°C), and ±1.5%
over industrial temperature range (-40°C to +85°C).
Provided in the QFN package, a SS pin and REFIN pin
enable supply sequencing and voltage tracking functionality.
Pinouts
SSDONE
TSOC
FSET
VCC
15
14
13
3
10 PGND
EN
4
9
TGATE
FB
LX
11 BGATE
GND
2
REFIN
COMP
8
BOOT
14 VCC
TSOC 2
13 PVCC
12 BGATE
COMP 4
11 PGND
FB 5
10 BOOT
EN 6
9 TGATE
FN9257 Rev 2.00
March 7, 2008
• Lossless Programmable Overcurrent Protection
- Top-Side MOSFET’s rDS(ON) Sensing
- ~120ns Blanking Time
Applications
• Test and Measurement Instruments
• Distributed DC/DC Power Architecture
• Industrial Applications
• Telecom/Datacom Applications
PART NUMBER
PART
TEMP.
(Note)
MARKING RANGE (°C)
FSET 1
GND 7
• Programmable Operating Frequency from 50kHz to
1.5MHz
Ordering Information
ISL8104 (14 LD SOIC)
TOP VIEW
SS 3
• Fast Transient Response
- 15MHz (typ) Gain-Bandwidth Error Amplifier with 6V/µs
slew rate
- Full 0% to 100% Duty Cycle Support
• Pb-free available (RoHS compliant)
12 PVCC
7
• 14V High Speed N-Channel MOSFET Gate Drivers
- 2.0A Source/3A Sink at 14V Bottom-Side Gate Drive
- 1.25A Source/2A Sink at 14V Top-Side Gate Drive
• Soft-Start Done and an External Reference Pin for
Tracking Applications are Available in the QFN Package
1
6
• 0.597V Internal Reference Voltage
- 1.0% Over the Commercial Temperature Range
- 1.5% Over the Industrial Temperature Range
• Support for Start-Up into Prebiased Loads
SS
5
- 1.5V to 15.4V Input Voltage Range
• Sourcing and Sinking Current Capability
ISL8104 (16 LD QFN)
TOP VIEW
16
• +8V ±5% to +14V ±10% Bias Voltage Range
8 LX
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL8104CBZ*
8104CBZ
0 to +70
14 Ld SOIC
M14.15
ISL8104IBZ*
8104IBZ
-40 to +85
14 Ld SOIC
M14.15
ISL8104CRZ*
81 04CRZ
0 to +70
16 Ld 4x4 QFN L16.4x4
ISL8104IRZ*
81 04IRZ
-40 to +85
16 Ld 4x4 QFN L16.4x4
ISL8104EVAL1Z Evaluation Board
ISL8104EVAL2Z Evaluation Board
*Add “-T” suffix for 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.
Page 1 of 14
EN
SS
ISL8104
FN9257 Rev 2.00
March 7, 2008
Block Diagram
VCC
TSOC
INTERNAL
REGULATOR
200µA
POWER-ON
RESET (POR)
30A
BOOT
SOURCE OCP
TGATE
SOFT-START
AND
FAULT LOGIC
SSDONE
(QFN ONLY)
FSET
GATE
CONTROL
LOGIC
OSCILLATOR
6µA
LX
PWM
REFERENCE
VREF = 0.597 V
PVCC
EA
REFIN
(QFN ONLY)
BGATE
GND
PGND
FB
COMP
Page 2 of 14
ISL8104
Typical Application with Single Power Supply
+8V TO +14V
VIN
LIN
RFILTER
CF2
VCC
CF1
DBOOT
CBIN
CHFIN
PVCC
BOOT
RTSOC
TSOC
SSDONE
(QFN ONLY)
CTSOC
REFIN
(QFN ONLY)
TGATE
EN
BGATE
LOUT
LX
ISL8104
RFSET
CBOOT
Q1
Q2
VOUT
CHFOUT
CBOUT
PGND
FSET
COMP
R2
C2
SS
R3
C1
FB
CSS
C3
GND
R1
R0
Typical Application with Separated Power Supplies
+1.5V TO +15.4V
VIN
+8V TO +14V
VCC
RFILTER
CF2
CF1
VCC
DBOOT
CBIN
CHFIN
PVCC
BOOT
RTSOC
TSOC
SSDONE
(QFN ONLY)
CTSOC
REFIN
(QFN ONLY)
FN9257 Rev 2.00
March 7, 2008
CHFOUT
VOUT
CBOUT
PGND
COMP
C2
SS
CSS
Q2
BGATE
ISL8104
FSET
LOUT
LX
EN
RFSET
CBOOT
Q1
TGATE
FB
GND
R2
C3
R3
C1
R0
R1
Page 3 of 14
ISL8104
Absolute Maximum Ratings
Thermal Information
Supply Voltage, VPVCC, VVCC . . . . . . . . . . . . . GND - 0.3V to +16V
Enable Voltage, VEN . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +16V
Soft-start Done Voltage, VSSDONE . . . . . . . . . . GND - 0.3V to +16V
TSOC Voltage, VTSOC. . . . . . . . . . . . . . . . . . . . GND - 0.3V to +16V
BOOT Voltage, VBOOT . . . . . . . . . . . . . . . . . . . GND - 0.3V to +36V
LX Voltage, VLX . . . . . . . . . . . . . . . . VBOOT - 16V to VBOOT + 0.3V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 5.0V
ESD Rating
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Resistance (Typical)
JA (°C/W)
JC (°C/W)
SOIC Package (Note 1) . . . . . . . . . . . .
95
N/A
QFN Package (Notes 2, 3). . . . . . . . . .
47
8.5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Supply Voltage, VVCC . . . . . . . . . . . . . . . . .+8V 5% to +14V 10%
Supply Voltage, VPVCC . . . . . . . . . . . . . . . .+8V 5% to +14V 10%
Boot to Phase Voltage, VBOOT - VLX . . . . . . . . . . . . . . . . .
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