LTC4232-1_15 Datasheet, PDF (1/16 Pages) Linear Technology – 5A Integrated Hot Swap Controller

FEATURES
n _{Reduced 16ms Turn-On Delay}
n _{Small Footprint}
n _{33mΩ MOSFET with RSENSE}
n _{Wide Operating Voltage Range: 2.9V to 15V}
n _{Adjustable, 10% Accurate Current Limit}
n _{Current and Temperature Monitor Outputs}
n _{Overtemperature Protection}
n _{Adjustable Current Limit Timer Before Fault}
n _{Power Good and Fault Outputs}
n _{Adjustable Inrush Current Control}
n _{2% Accurate Undervoltage and Overvoltage}
Protection
n _{Available in 16-Lead 5mm × 3mm DFN Package}
APPLICATIONS
n _{RAID Systems}
n _{Server I/O Cards}
n _{PCI Express Systems}
n _Industrial
LTC4232-1
5A Integrated Hot Swap
Controller
DESCRIPTION
The LTC^®4232-1 is an integrated solution for Hot Swap™
applications that allows a board to be safely inserted and
removed from a live backplane. The part integrates a Hot
Swap controller, power MOSFET and current sense resis-
tor in a single package for small form factor applications.
The LTC4232-1 provides separate inrush current control
and a 10% accurate 5A current limit with foldback cur-
rent limiting. The current limit threshold can be adjusted
dynamically using an external pin. Additional features
include a current monitor output that amplifies the sense
resistor voltage for ground referenced current sensing
and a MOSFET temperature monitor output. Thermal limit,
overvoltage, undervoltage and power good monitoring
are also provided.
The PCI Express compliant LTC4232-1 allows faster turn-on
than the LTC4232 by providing a shorter (16ms) debounce
delay and external control of the GATE ramp rate.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. Hot Swap and PowerPath are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V, 5A Card Resident Application with Auto-Retry
12V
*DIODES INC. SMAJ22A
*
107k
5.23k
10k
V_DD
OUT
UV
FB
FLT
LTC4232DHC-1
OV
PG
GATE
TIMER
I_SET
0.1µF
INTV_CC
I_MON
1µF
GND
V_OUT
12V
150k
+
5A
150µF
V_IN
10V/DIV
20k 10k
3.3nF
I_IN
1A/DIV
100k
4.7nF
V_OUT
10V/DIV
ADC
20k
42321 TA01a
PG
10V/DIV
Power-Up Waveforms
CONTACT BOUNCE
4ms/DIV
42321 TA01b
For more information www.linear.com/LTC4232-1
42321f
1