ISL6172
®
Data Sheet
June 2004
FN9158
Dual Low Voltage Hot Swap Controller
Features
This IC targets dual voltage hot swap applications across the
+2.5V to +3.3V bias supply voltage range with a second lower
voltage rail down to less than 1V. It features a charge pump for
driving external N-Channel MOSFETs, regulated current
protection and duration, output undervoltage monitoring and
reporting, optional latch-off or retry response, and adjustable
soft-start.
• Dual Supply Hot Swap Power Distribution Control to <1V
• Less than 1µs Response Time to Dead Short
• Overcurrent Circuit Breaker Fault Isolation and
Programmable Current Regulation Level Protection
Functions
• Programmable Current Regulation Duration
• Charge Pump Allows the use of N-Channel MOSFETs
• Rail Independent Control, Monitoring and Reporting I/O
• Adjustable Ramp up for Inrush Protection During Turn On
The current regulation level (CR) for each rail is set by two
external resistors and each CR duration is set by an external
capacitor on the TIM pin. After the CR duration has expired
the IC then quickly pulls down the associated GATE(s)
output turning off its external FET(s). The ISL6172 offers a
latched output or indefinite auto retry mode of operation.
• Two Levels of Overcurrent Detection Provide Fast
Response to Varying Fault Conditions
• Latch-off or Auto Reset Response to Fault Functions
• Adjustable Current Regulation Threshold as low as 20mV
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
Ordering Information
TEMP.
PKG.
PART NUMBER RANGE (°C)
PACKAGE
DWG. #
ISL6172DRZA *
ISL6172DRZA-T*
0 to +85 28 Ld 5x5 QFN (Pb-free) L28.5x5
0 to +85 28 Ld 5x5 QFN (Pb-free) L28.5x5
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
ISL6172EVAL3 Evaluation Platform
• Pb-free
* 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.
Applications
• Power Supply Sequencing, Distribution and Control
• Hot Swap/Electronic Breaker Circuits
• Network Hubs, Routers, Switches
Pinout
28 LEAD QFN
• Hot Swap Bays, Cards and Modules
TOP VIEW
Rsns1
V1(out)
V1(in)
28
27
26
25
24
23
22
SNS2
VO1
SS1
1
2
3
4
5
6
7
21 SNS2
20 VO2
VS1
SNS1 GT1 VO1
EN1EN2
UV1
PG1
RTR/LTCH
BIAS
FLT1
SS1
OCREF
SS2
CPQ+
19
SS2
18 GT2
17
CPQ-
CPVDD
ISL6172
GT1
FLT1
PG1
CT1
FLT2
FLT2
PG2
UV2
PGND
GND
16 PG2
15 CT2
CT1 CT2 VS2
SNS2 GT2 VO2
8
9
10
11
12
13
14
V2(OUT)
V2(in)
Rsns2
FIGURE 1. TYPICAL APPLICATION
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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1
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