LTC4232-1
5A Integrated Hot Swap
Controller
Fea T Descrip T
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Reduced 16ms Turn-On Delay The LTC 4232-1 is an integrated solution for Hot Swap
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Small Footprint applications that allows a board to be safely inserted and
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33m MOSFET with R removed from a live backplane. The part integrates a Hot
SENSE
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Wide Operating Voltage Range: 2.9V to 15V Swap controller, power MOSFET and current sense resis-
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Adjustable, 10% Accurate Current Limit tor in a single package for small form factor applications.
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Current and Temperature Monitor Outputs
The LTC4232-1 provides separate inrush current control
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Overtemperature Protection
and a 10% accurate 5A current limit with foldback cur-
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Adjustable Current Limit Timer Before Fault
rent limiting. The current limit threshold can be adjusted
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Power Good and Fault Outputs
dynamically using an external pin. Additional features
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Adjustable Inrush Current Control
include a current monitor output that amplifies the sense
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2% Accurate Undervoltage and Overvoltage Protection
resistor voltage for ground referenced current sensing
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Pin Compatible with LTC4217 (DFN Package Only)
and a MOSFET temperature monitor output. Thermal limit,
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Available in 16-Lead 5mm 3mm DFN Package
overvoltage, undervoltage and power good monitoring
are also provided.
a T
The PCI Express compliant LTC4232-1 allows faster turn-on
than the LTC4232 by providing a shorter (16ms) debounce
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RAID Systems, Solid State Drives
delay and external control of the GATE ramp rate.
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Server I/O Cards
n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
PCI Express Systems
Technology Corporation and PowerPath is a trademark of Linear Technology Corporation. All
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Industrial other trademarks are the property of their respective owners.
Typical a T
12V, 5A Card Resident Application with Auto-Retry
Power-Up Waveforms
V
OUT
12V V OUT 12V
DD
5A
+
150k
V
*
150F IN
CONTACT BOUNCE
107k
10V/DIV
UV FB
20k 10k
FLT
I
IN
LTC4232DHC-1
5.23k 1A/DIV
3.3nF
OV PG
V
100k
OUT
10k
10V/DIV
GATE
4.7nF
TIMER I
SET
PG
0.1F
10V/DIV
I
INTV ADC
CC MON
1F
GND
20k
42321 TA01a
42321 TA01b
4ms/DIV
*TVS: DIODES INC. SMAJ17A
42321fb
1
For more information www.linear.com/LTC4232-1
ion pplica
ions pplica
ion uresLTC4232-1
a Te Maxi Mu M r a T p in c F T
(Notes 1, 2)
TOP VIEW
Supply Voltage (V ) ................................. 0.3V to 28V
DD
V 1 16 V
DD DD
Input Voltages
UV 2 15 I
SET
FB, OV, UV ..............................................0.3V to 12V
OV 3 14 I
MON
TIMER ................................................... 0.3V to 3.5V
TIMER 4 13 FB
17
SENSE .............................V 10V or 0.3V to V
DD DD
SENSE
INTV 5 12 FLT
CC
Output Voltages
GND 6 11 PG
I , I ................................................. 0.3V to 3V
SET MON
OUT 7 10 GATE
PG, FLT .................................................. 0.3V to 35V
OUT 8 9 OUT
OUT ............................................ 0.3V to V + 0.3V
DD
DHC PACKAGE
INTV .................................................. 0.3V to 3.5V
CC
16-LEAD (5mm 3mm) PLASTIC DFN
GATE (Note 3) ........................................ 0.3V to 33V
T = 125C, = 43C/W
JMAX JA
EXPOSED PAD (PIN 17) IS SENSE,
Operating Ambient Temperature Range
= 43C/W SOLDERED, OTHERWISE = 140C/W
JA JA
LTC4232C-1 ............................................. 0C to 70C
LTC4232I-1 ..........................................40C to 85C
Junction Temperature (Notes 4, 5) ........................ 125C
Storage Temperature Range .................. 65C to 150C
o r Der i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4232CDHC-1#PBF LTC4232CDHC-1#TRPBF 42321 16-Lead (5mm 3mm) Plastic DFN 0C to 70C
LTC4232IDHC-1#PBF LTC4232IDHC-1#TRPBF 42321 16-Lead (5mm 3mm) Plastic DFN 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: