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FN6830.0
ISL6174
Dual Low Voltage Circuit Breaker
This IC targets dual voltage hot swap applications across the
+2.5V to +3.3V (nominal) bias supply voltage range with a
second lower voltage rail down to less than 1V where a circuit
breaker response to an over current event is preferred.
It features a charge pump for driving external N-Channel
MOSFETs, accurate programmable circuit breaker current
thresholds and delay output undervoltage monitoring and
reporting and adjustable soft-start.
The circuit breaker current level (I
CB
) for each rail is set by
two external resistors, and for each rail a delay (t
CB)
is set by
an external capacitor on the TCB pin. After t
CB
has expired,
the IC then quickly pulls down the associated GATE(s)
output turning off its external FET(s).
Pinout
ISL6174
(28 LD QFN)
TOP VIEW
Features
"  Fast Circuit Breaker Quickly Responds to Overcurrent
Fault Conditions
"  Less than 1祍 Response Time to Dead Short
"  Programmable Circuit Breaker Level and Delay
"  Two Levels of Overcurrent Detection Provide Fast
Response to Varying Fault Conditions
"  Overcurrent Circuit Breaker and Fault Isolation Functions
"  Adjustable Circuit Breaker Threshold as Low as 20mV
"  Adjustable Voltage Ramp-up for In-Rush Protection
During Turn-On
"  Rail Independent Control, Monitoring and Reporting I/O
"  Dual Supply Hot Swap Power Distribution Control to <1V
"  Charge Pump Allows the Use of N-Channel MOSFETs
"  QFN Package:
-  Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
-  Near Chip Scale Package Footprint, Which Improves
PCB Efficiency and has a Thinner Profile
"  Pb-Free (RoHS Compliant)
Applications
"  Power Supply Sequencing, Distribution and Control
"  Hot Swap / Electronic Circuit Breaker Circuits
Ordering Information
PART NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(癈)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL6174IRZ*
ISL6174 IRZ   -40 to +85  28 Ld 5x5 QFN L28.5x5
ISL617XEVAL1Z Evaluation Platform
*Add -T suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach materials,
and 100% matte tin plate plus anneal (e3 termination finish, which is
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.
1
2
3
4
5
6
7
21
20
19
18
17
16
15
28  27  26  25  24  23  22
8   9   10  11  12  13  14
SNS2
VO2
SS2
GT2
FLT2
PG2
TCB2
SNS1
VO1
SS1
GT1
FLT1
PG1
TCB1
V1(IN)
V2(IN)
V1(OUT)
V2(OUT)
R
SNS
1
R
SNS
2
FIGURE 1. TYPICAL APPLICATION
ISL6174
EN1
EN2
BIAS
CPQ+
CPQ-
CPVDD
PGND
GND
TCB1TCB2 VS2    SNS2  GT2 VO2
UV2
PG2
FLT2
FLT1
PG1
SS1
SS2
OCREF
GT1 VO1
UV1
VS1   SNS1
Data 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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
December 19, 2008