廬
ISL6161
Data Sheet
July 2004
FN9104.3
Dual Power Distribution Controller
The ISL6161 is a HOT SWAP dual supply power distribution
controller that can be used in PCI-Express applications.
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 10碌A(chǔ) 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.
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,
C
TIM
, starts charging as the controller enters the time out
period. Once C
TIM
charges to a 2V threshold, both the
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.
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.
Features
鈥?HOT SWAP Dual Power Distribution and Control for +12V
and +3.3V
鈥?Provides Fault Isolation
鈥?Programmable Current Regulation Level
鈥?Programmable Time Out
鈥?Charge Pump Allows the Use of N-Channel MOSFETs
鈥?Power Good and Over Current Latch Indicators
鈥?Adjustable Turn-On Ramp
鈥?Protection During Turn-On
鈥?Two Levels of Current Limit Detection Provide Fast
Response to Varying Fault Conditions
鈥?1碌s Response Time to Dead Short
鈥?3碌s Response Time to 200% Current Overshoot
鈥?Pb-free available
Applications
鈥?PCI-Express Applications
鈥?Power Distribution and Control
鈥?Hot Plug, Hot Swap Components
PART NUMBER
ISL6161CB
ISL6161CBZA
(See Note)
TEMP. RANGE
(
o
C)
-0 to 70
-0 to 70
PACKAGE
14 Ld SOIC
14 Ld SOIC
(Pb-free)
PKG.
DWG. #
M14.15
M14.15
*Add 鈥?T鈥?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
ISL6161 (SOIC)
TOP VIEW
Typical Application Diagram
C
PUMP
R
SENSE
12VS
12VG
V
DD
NC
1
2
3
4
5
6
7
14 12VISEN
13 R
ILIM
12 GND
11 C
PUMP
10 C
TIM
9
8
PGOOD
3VISEN
3.3V
C
GATE
OPTIONAL
V
DD
R
FILTER
C
FILTER
C
GATE
12V
ISL6161
12VS
12VG
V
DD
ENABLE
INPUT
12VISEN
R
ILIM
GND
C
PUMP
C
TIM
3.3V
R
ILIM
R
LOAD
ENABLE
3VG
3VS
C
TIM
ENABLE
PGOOD
3VG
3VS
3ISEN
R
SENSE
R
LOAD
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2001, 2003-2004. All Rights Reserved. Hot Plug鈩?is a trademark of Core International, Inc.
All other trademarks mentioned are the property of their respective owners.
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