ISL6161
®
Data Sheet
July 2004
FN9104.3
Dual Power Distribution Controller
Features
The ISL6161 is a HOT SWAP dual supply power distribution
controller that can be used in PCI-Express applications.
• HOT SWAP Dual Power Distribution and Control for +12V
and +3.3V
• Provides Fault Isolation
Two external N-Channel MOSFETs are driven to distribute
and control power while providing load fault isolation. At turn-
on, the gate of each external N-Channel MOSFET is
charged with a 10µA current source. Capacitors on each
gate (see the Typical Application Diagram), create a
programmable ramp (soft turn-on) to control inrush currents.
A built in charge pump supplies the gate drive for the 12V
supply N-Channel MOSFET switch.
• Programmable Current Regulation Level
• Programmable Time Out
• Charge Pump Allows the Use of N-Channel MOSFETs
• Power Good and Over Current Latch Indicators
• Adjustable Turn-On Ramp
• Protection During Turn-On
Over current protection is facilitated by two external current
sense resistors and FETs. When the current through either
resistor exceeds the user programmed value the controller
enters the current regulation mode. The time-out capacitor,
• Two Levels of Current Limit Detection Provide Fast
Response to Varying Fault Conditions
• 1µs Response Time to Dead Short
• 3µs Response Time to 200% Current Overshoot
• Pb-free available
C
, starts charging as the controller enters the time out
TIM
period. Once C
charges to a 2V threshold, both the
TIM
N-Channel MOSFETs are latched off. In the event of a hard
and fast fault of at least three times the programmed current
limit level, the N-Channel MOSFET gates are pulled low
immediately before entering the time out period. The
controller is reset by a rising edge on the ENABLE pin.
Applications
• PCI-Express Applications
• Power Distribution and Control
• Hot Plug, Hot Swap Components
The ISL6161 constantly monitors both output voltages and
reports either one being low on the PGOOD output as a low.
The 12V PGOOD Vth is ~10.8V and the 3.3V Vth is ~2.8V
nominally.
TEMP. RANGE
PKG.
DWG. #
o
PART NUMBER
( C)
PACKAGE
ISL6161CB
-0 to 70
-0 to 70
14 Ld SOIC
M14.15
M14.15
ISL6161CBZA
(See Note)
14 Ld SOIC
(Pb-free)
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding
compounds/die attach materials and 100% matte tin plate termination finish, which
is 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-020B.
Pinout
Typical Application Diagram
ISL6161 (SOIC)
TOP VIEW
C
PUMP
R
SENSE
R
LOAD
1
2
3
4
5
6
7
12VS
12VG
14
12VISEN
12V
ISL6161
R
13
ILIM
12VISEN
R
12VS
12VG
OPTIONAL
ILIM
C
C
V
R
12 GND
11 C
GATE
DD
ILIM
R
FILTER
V
DD
GND
NC
V
PUMP
DD
C
PUMP
ENABLE
3VG
C
FILTER
10 C
TIM
ENABLE
INPUT
TIM
3.3V
C
TIM
ENABLE
3VG
9
8
PGOOD
3VISEN
PGOOD
3ISEN
3VS
3.3V
3VS
R
C
R
GATE
SENSE
LOAD
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2001, 2003-2004. All Rights Reserved. Hot Plug™ is a trademark of Core International, Inc.
All other trademarks mentioned are the property of their respective owners.
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