ISL6235
TM
Data Sheet
J une 2001
FN9029
Advanced Triple PWM Only Mode and
Dual Linear Power Controller for Portable
Applications
Features
• PWM Only Mode for Reduced Noise at Light Loads
• Provides Five Regulated Voltages
- +5V ALWAYS
- +3.3V ALWAYS
- +5V Main
The ISL6235 provides a highly integrated power control and
protection solution for five output voltages required in high-
performance notebook PC applications. The IC integrates
three fixed frequency pulse-width-modulation (PWM)
controllers and two linear regulators along with monitoring
and protection circuitry into a single 24 lead SSOP package.
- +3.3V Main
- +12V
• High Efficiency Over Wide Line and Load Range
- Synchronous Buck Converters on Main Outputs
The two PWM controllers that regulate the system main 5V
and 3.3V voltages are implemented with synchronous-
rectified buck converters. Synchronous rectification insures
high efficiency over a wide range of input voltage and load
variation. Efficiency is further enhanced by using the lower
• No Current-Sense Resistor Required
- Uses MOSFET’s r
DS(ON)
- Optional Current-Sense Resistor for More Precision
• Operates Directly From Battery 5.6 to 24V Input
• Input Undervoltage Lock-Out (UVLO)
MOSFET’s r
as the current sense element. Input
DS(ON)
voltage feed-forward ramp modulation, current-mode
control, and internal feed-back compensation provide fast
and stable handling of input voltage load transients
encountered in advanced portable computer chip sets.
• Excellent Dynamic Response
- Voltage Feed-Forward and Current-Mode Control
The third PWM controller is a boost converter that regulates
a resistor selectable output voltage of nominally 12V.
• Monitors Output Voltages
• Synchronous Converters Operate Out of Phase
Two internal linear regulators provide +5V ALWAYS and
+3.3V ALWAYS low current outputs required by the
notebook system controller.
• Separate Shut-Down Pins for Advanced Configuration and
Power Interface (ACPI) Compatibility
• 300kHz Fixed Switching Frequency on Main Outputs
• Thermal Shut-Down Protection
Ordering Information
TEMP.
PKG.
NO.
o
PART NUMBER RANGE ( C)
PACKAGE
Applications
ISL6235CA
-10 to 85
24 Ld SSOP
M24.15
•
Mobile PCs
IPM6220EVAL1
Evaluation Board
• Hand-Held Portable Instruments
• LCD PCs
Pinout
ISL6235 (SSOP)
• Cable Modems
• DSL Modems
TOP VIEW
VBATT
1
2
3
4
5
6
7
8
9
24 BOOT1
23 UGATE1
22 PHASE1
21 ISEN1
• Set Top Box
3.3V ALWAYS
BOOT2
Related Literature
• Application Note AN9915 (IPM6220)
UGATE2
PHASE2
5V ALWAYS
LGATE2
PGND2
20 LGATE1
19 PGND1
18 VSEN1
17 SDWN1
16 GATE3
15 VSEN3
14 GND
ISEN2
VSEN2 10
SDWN2 11
PGOOD 12
13 SDWNALL
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2001, All Rights Reserved
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