LTC4234_15 Datasheet, PDF (1/20 Pages) Linear Technology – 20A Guaranteed SOA Hot Swap Controller

LTC4234
20A Guaranteed SOA
Hot Swap Controller
FEATURES
nn _{Allows Safe Board Insertion into Live Backplane}
nn _{Small Footprint}
nn _{4mΩ MOSFET Including RSENSE}
nn _{Guaranteed Safe Operating Area: 81W, 30ms}
nn _{Wide Operating Voltage Range: 2.9V to 15V}
nn _{Adjustable, 11% Accurate Current Limit}
nn _{Current and Temperature Monitor Outputs}
nn _{Overtemperature Protection}
nn _{Adjustable Current Limit Timer Before Fault}
nn _{Power Good and Fault Outputs}
nn _{Adjustable Inrush Current Control}
nn _{2.5% Accurate Undervoltage and Overvoltage Protection}
nn _{Available in a 38-Pin (5mm × 9mm) QFN Package}
APPLICATIONS
nn _{High Availability Servers}
nn _{Solid State Drives}
nn _Industrial
nn _{240W, 12V Systems}
DESCRIPTION
The LTC^®4234 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
resistor in a single package for small form factor applica-
tions. The MOSFET Safe Operating Area is production tested
and guaranteed for the stresses in Hot Swap applications.
The LTC4234 provides separate inrush current control
and a 11% accurate 22.5A current limit with output
dependent foldback. The current limit threshold can be
adjusted dynamically using the I_SET 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V, 20A Card Resident Application with Auto-Retry
12V
V_DD
OUT
*
107k _UV
FB
5.23k
10k
1µF
FLT
LTC4234
OV
PG
SENSE^–
SENSE
GATE
TIMER
INTV_CC
GND
I_SET
I_MON
*DIODES INC. SMAJ22A
V_OUT
150k
+
12V
20A
1000µF
20k 10k
ADC
20k
4234 TA01a
V_IN
10V/DIV
I_IN
0.2A/DIV
V_OUT
10V/DIV
PG
10V/DIV
Power-Up Waveform
CONTACT
BOUNCE
20ms/DIV
4234 TA01b
4234f
For more information www.linear.com/LTC4234
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