LTC4216 Datasheet, PDF (1/24 Pages) Linear Technology – Ultralow Voltage Hot Swap Controller

LTC4216
Ultralow Voltage
Hot Swap Controller
FEATURES
■ _{Allows Safe Board Insertion and Removal from}
a Live Backplane
■ _{Controls Load Voltages from 0V to 6V}
■ _{Fast Response Limits Peak Fault Current}
■ _{Adjustable Analog Current Limit}
■ _{Adjustable Soft-Start with Inrush Current Limiting}
■ _{Adjustable Response Time for Overcurrent}
Protection
■ _{Low Circuit Breaker Trip Threshold: 25mV}
■ _{No External Gate Capacitor Required}
■ _{Gate Drive for External N-Channel MOSFET}
■ _{Adjustable Supply Voltage Power-Up Rate}
■ _{⎯R⎯E⎯S⎯E⎯T and ⎯F⎯A⎯U⎯L⎯T Output}
■ _{10-Lead MSOP and 12-Lead (4mm × 3mm) DFN}
Packages
U
APPLICATIO S
■ _{Electronic Circuit Breaker}
■ _{Live Board Insertion and Removal}
■ _{Industrial High Side Switch/Circuit Breaker}
■ _{Optical Networking}
DESCRIPTIO
The LTC^®4216 is a positive low-voltage Hot Swap^TM
controller that allows a board to be safely inserted and
removed from a live backplane. It controls load voltages
ranging from 0V to 6V and isolates a severe fault with
instantaneous analog current limiting.
An internal high side switch driver controls the gate of
an external N-channel MOSFET. An adjustable soft-start
limits the rate of change of the inrush current at start-up
for a large load capacitor. Together with an analog current
limit amplifier, an electronic circuit breaker with adjustable
response time provides dual level overcurrent protection.
No external gate capacitor is required for the analog cur-
rent limit loop compensation.
The FB pin monitors the output supply voltage and signals
the ^⎯R^⎯E^⎯S^⎯E^⎯T output pin. An ON pin provides on/off control
and a ^⎯F^⎯A^⎯U^⎯L⎯T pin indicates the fault status. The LTC4216
is available in the 10-lead MSOP and 12-lead (4mm ×
3mm) DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Single Channel 1.8V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
V_IN
LONG
1.8V
V_CC
LONG ^22Ω
3.3V
330nF
0.004Ω Si4864DY
SENSEP SENSEN GATE
V_CC
LTC4216
17.4k
+
1000µF
V_OUT
1.8V
5A
1%
3.3V
FB
10k
1%
10k 10k
µP
LOGIC
SHORT
15k
1%
ON
20k TIMER
1%
FAULT
SS FILTER GND RESET
FAULT
RESET
LONG
10nF 10nF 18nF
GND
4216 TA01
V_GATE
5V/DIV
I_OUT
2.5A/DIV
V_OUT
1V/DIV
Normal Power-Up
with Soft-Start
0.5ms/DIV
4216 TA01b
4216f
1