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ISL8104
Data Sheet
February 13, 2006
FN9257.0
Synchronous Buck Pulse-Width
Modulator (PWM) Controller
The ISL8104 is a high performance synchronous controller
for demanding DC/DC converter applications. It provides
overcurrent fault protection and is designed to safely start-up
into prebiased output loads.
The output voltage of the converter can be precisely
regulated to as low as 0.597V, with a maximum tolerance of
卤1% over the commercial temperature range, and 卤1.5%
over the industrial temperature range.
The ISL8104 provides simple, single feedback loop, voltage-
mode control with fast transient response. It includes a
triangle-wave oscillator that is adjustable from below 50kHz
to over 1.5MHz. Full (0% to 100%) PWM duty cycle support
is provided.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/碌s slew rate which enables high converter
bandwidth for fast transient performance.
The ISL8104's overcurrent protection monitors the current
by using the
r
DS(ON)
of the upper MOSFET which eliminates
the need for a current sensing resistor.
Features
鈥?Operates from an +8V 卤5% to +14V 卤10% Input
鈥?Excellent Output Voltage Regulation
- 0.597V Internal Reference
-
卤1%
Over the Commercial Temperature Range
-
卤1.5%
Over the Industrial Temperature Range
鈥?Simple Single-Loop Control Design
- Voltage-Mode PWM Control
鈥?Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
- Leading and Falling Edge Modulation
鈥?Small Converter Size
- Constant Frequency Operation
- Oscillator Programmable from 50kHz to Over 1.5MHz
鈥?14V High Speed MOSFET Gate Drivers
- 2.0A Source/3A Sink at 14V Low Side Gate Drive
- 1.25A Source/2A Sink at 14V High Side Gate Drive
- Drives Two N-Channel MOSFETs
鈥?Overcurrent Fault Monitor
- High-Side MOSFET鈥檚 r
DS(ON)
Sensing
- Reduced ~120ns Blanking Time
鈥?Converter can Source and Sink Current
鈥?Soft-Start Done and an External Reference Pin for
Tracking Applications are Available in the QFN Package
鈥?Pin Compatible with ISL6522 and ISL6535
鈥?Supports Start-Up into Prebiased Loads
鈥?Pb-Free Plus Anneal Available (RoHS Compliant)
Pinouts
ISL8104
(14 LD NARROW SOIC AND 16 LD QFN)
TOP VIEW
RT 1
OCSET 2
SS 3
COMP 4
FB 5
EN 6
GND 7
14 VCC
13 PVCC
12 LGATE
11 PGND
10 BOOT
9 UGATE
8 PHASE
Applications
鈥?Test & Measurement Instruments
鈥?Routers Switches
鈥?Medical Instrumentation
鈥?Industrial Applications
鈥?Telecom/Datacom Applications
SSDONE
OCSET
RT
VCC
Ordering Information
PART #
(Note)
12
PVCC
11
LGATE
10
PGND
9
BOOT
16
SS
COMP
FB
EN
1
2
3
4
5
REFIN
15
14
13
PART
TEMP.
MARKING RANGE (掳C)
0 to 70
-40 to 85
0 to 70
-40 to 85
8104IBZ
8104IRZ
PACKAGE
(Pb-free)
14 Ld SOIC
14 Ld SOIC
PKG.
DWG. #
M14.15
M14.15
ISL8104CBZ 8104CBZ
ISL8104IBZ
ISL8104IRZ
ISL8104CRZ 8104CRZ
16 Ld 4x4 QFN L16.4x4
16 Ld 4x4 QFN L16.4x4
6
GND
7
PHASE
8
UGATE
Add 鈥?T鈥?suffix for tape and reel.
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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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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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