1
®
June 8, 2006
ISL6224
Single Output Mobile-Friendly PWM
Controller
The ISL6224 provides power control and protection for a single,
adjustable output voltage required to power chip-sets and
memory banks in high-performance notebooks and PDAs. This
output voltage is adjustable in the range from 0.9-5.5V.
The hysteretic or PWM controller regulates the output
voltage from battery voltages ranging from 4V to 24V.
Synchronous rectification and hysteretic operation at light
loads contribute to a high efficiency over a wide range of
input voltages and loads. Efficiency is even further enhanced
by using MOSFET’s r
DS(ON
) as a current sense component.
Feed-forward ramp modulation, average current mode
control and internal feed-back compensation provide fast
and firm handling of transients when powering advanced
chip sets.
Two-stage conversion using system 5V voltage is possible at
a higher frequency (600kHz) to minimize the output filter size.
The ISL6224 monitors the output voltage. A PGOOD (power
good) signal is issued when soft-start is completed and the
output is within ±10% of the set point.
A built-in overvoltage protection prevents output voltage
from going above 120% of the set point. Undervoltage
protection latches the chip off when the output drops below
70% of its setting value after soft-start sequence is
completed. The PWM controller’s overcurrent circuitry
monitors the output current by sensing the voltage drop
across the lower MOSFET. If higher precision sense
technique is required, an optional external current-sense
resistor may be used.
Features
• Adjustable output voltgage: 0.9-5.5V
• High efficiency over wide load range
- Higher efficiency in hysteretic mode at light load
• Lossless current sense scheme
- Uses MOSFET’s r
DS(ON)
- Optional current sense method higher precision
• Supply operation mode
- Wide V
IN
range: 4V-24V
- Single 5V system rail
• Input undervoltage lock-out on VCC pin (UVLO)
• Excellent dynamic response
- Combined voltage feed-forward and current mode
control
• Power-good indicator
• 300/600kHz switching frequency
• Thermal shut-down
• Pb-free plus anneal available (RoHS compliant)
Applications
•
Mobile PCs
• Graphic cards
• Hand-held portable instruments
Related Literature
• Application Note AN9983
Pinout
ISL6224 (SSOP)
TOP VIEW
Ordering Information
PART
NUMBER
PART
MARKING TEMP. (°C) PACKAGE
PKG.
DWG. #
ISL6224CA ISL6224CA -10 to 85 16 Ld SSOP M16.15A
ISL6224CAZ
(Note 1)
6224CAZ -10 to 85 16 Ld SSOP
(Pb-free)
M16.15A
NOTES:
1. 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.
2. Add “-T” for Tape and Reel.
EN
GND
ISEN
VCC
VSEN
LGATE
PGND
VIN
BOOT
UGATE
PHASE
PGOOD
14
13
12
11
10
9
1
2
3
4
5
6
7
8
SOFT
OCSET
15
16
VOUT
FCCM
FN9042.8Data Sheet
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. 2004, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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