ISL6235 Datasheet, PDF (1/14 Pages) Intersil Corporation – Advanced Triple PWM Only Mode and Dual Linear Power Controller for Portable Applications

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June 2001
ISL6235
FN9029
Advanced Triple PWM Only Mode and
Dual Linear Power Controller for Portable
Applications
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.
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
MOSFET’s r_DS(ON) as the current sense element. Input
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.
The third PWM controller is a boost converter that regulates
a resistor selectable output voltage of nominally 12V.
Two internal linear regulators provide +5V ALWAYS and
+3.3V ALWAYS low current outputs required by the
notebook system controller.
Ordering Information
TEMP.
PART NUMBER RANGE (^oC)
PACKAGE
ISL6235CA
-10 to 85 24 Ld SSOP
IPM6220EVAL1 Evaluation Board
PKG.
NO.
M24.15
Pinout
ISL6235 (SSOP)
TOP VIEW
VBATT 1
3.3V ALWAYS 2
BOOT2 3
UGATE2 4
PHASE2 5
5V ALWAYS 6
LGATE2 7
PGND2 8
ISEN2 9
VSEN2 10
SDWN2 11
PGOOD 12
24 BOOT1
23 UGATE1
22 PHASE1
21 ISEN1
20 LGATE1
19 PGND1
18 VSEN1
17 SDWN1
16 GATE3
15 VSEN3
14 GND
13 SDWNALL
Features
• PWM Only Mode for Reduced Noise at Light Loads
• Provides Five Regulated Voltages
- +5V ALWAYS
- +3.3V ALWAYS
- +5V Main
- +3.3V Main
- +12V
• High Efficiency Over Wide Line and Load Range
- Synchronous Buck Converters on Main Outputs
• 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)
• Excellent Dynamic Response
- Voltage Feed-Forward and Current-Mode Control
• Monitors Output Voltages
• Synchronous Converters Operate Out of Phase
• Separate Shut-Down Pins for Advanced Configuration and
Power Interface (ACPI) Compatibility
• 300kHz Fixed Switching Frequency on Main Outputs
• Thermal Shut-Down Protection
Applications
• _{Mobile PCs}
• Hand-Held Portable Instruments
• LCD PCs
• Cable Modems
• DSL Modems
• Set Top Box
Related Literature
• Application Note AN9915 (IPM6220)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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