ISL8104
®
Data Sheet
February 13, 2006
FN9257.0
Synchronous Buck Pulse-Width
Modulator (PWM) Controller
Features
• Operates from an +8V ±5% to +14V ±10% Input
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.
• Excellent Output Voltage Regulation
- 0.597V Internal Reference
- ±1% Over the Commercial Temperature Range
- ±1.5% Over the Industrial Temperature Range
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
- Leading and Falling Edge Modulation
• Small Converter Size
- Constant Frequency Operation
- Oscillator Programmable from 50kHz to Over 1.5MHz
The output voltage of the converter can be precisely
regulated to as low as 0.597V, with a maximum tolerance of
±1% over the commercial temperature range, and ±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.
• 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
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate which enables high converter
bandwidth for fast transient performance.
The ISL8104's overcurrent protection monitors the current
• Overcurrent Fault Monitor
by using the r
of the upper MOSFET which eliminates
DS(ON)
- High-Side MOSFET’s r
Sensing
DS(ON)
the need for a current sensing resistor.
- Reduced ~120ns Blanking Time
• Converter can Source and Sink Current
• Soft-Start Done and an External Reference Pin for
Tracking Applications are Available in the QFN Package
• Pin Compatible with ISL6522 and ISL6535
• Supports Start-Up into Prebiased Loads
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinouts
ISL8104
(14 LD NARROW SOIC AND 16 LD QFN)
TOP VIEW
14 VCC
1
2
3
4
5
6
7
RT
OCSET
SS
13 PVCC
12 LGATE
Applications
• Test & Measurement Instruments
• Routers Switches
• Medical Instrumentation
• Industrial Applications
COMP
FB
11
PGND
10 BOOT
9
8
UGATE
PHASE
EN
GND
• Telecom/Datacom Applications
Ordering Information
PART #
(Note)
PART
TEMP.
PACKAGE
(Pb-free)
PKG.
16 15 14 13
MARKING RANGE (°C)
DWG. #
SS
COMP
FB
1
2
3
4
12 PVCC
11 LGATE
10 PGND
ISL8104CBZ 8104CBZ
ISL8104IBZ 8104IBZ
ISL8104CRZ 8104CRZ
ISL8104IRZ 8104IRZ
Add “-T” suffix for tape and reel.
0 to 70
14 Ld SOIC
M14.15
M14.15
-40 to 85 14 Ld SOIC
0 to 70
-40 to 85 16 Ld 4x4 QFN L16.4x4
16 Ld 4x4 QFN L16.4x4
EN
9
BOOT
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.
5
6
7
8
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
1
All other trademarks mentioned are the property of their respective owners.
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