LTC4216_15 Datasheet, PDF (1/26 Pages) Linear Technology – Ultralow Voltage Hot Swap Controller

LTC4216
Ultralow Voltage
Hot Swap Controller
Features
n _{Allows Safe Board Insertion and Removal from}
a Live Backplane
n _{Controls Load Voltages from 0V to 6V}
n _{Fast Response Limits Peak Fault Current}
n _{Adjustable Analog Current Limit}
n _{Adjustable Soft-Start with Inrush Current Limiting}
n _{Adjustable Response Time for Overcurrent}
Protection
n _{Low Circuit Breaker Trip Threshold: 25mV}
n _{No External Gate Capacitor Required}
n _{Internal Charge Pump for N-Channel MOSFET}
n _{Adjustable Output Power-Up Rate}
n _{RESET and FAULT Output}
n _{10-Lead MSOP and 12-Lead (4mm × 3mm) DFN}
Packages
Applications
n _{Electronic Circuit Breaker}
n _{Live Board Insertion and Removal}
n _{Industrial High Side Switch/Circuit Breaker}
n _{Optical Networking}
Description
The LTC^®4216 is a positive low voltage Hot Swap^™ 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 RESET output pin. An ON pin provides on/off control
and a FAULT pin indicates the fault status. The LTC4216
is available in the 10-lead MSOP and 12-lead (4mm ×
3mm) DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
Single Channel 1.8V Hot Swap Controller
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
V_IN
LONG
1.8V
0.004Ω Si4864DY
V_CC
3.3V
LONG ^22Ω
SENSEP SENSEN GATE
V_CC
FB
330nF
LTC4216
SHORT
15k
1%
ON
20k TIMER
1%
FAULT
SS FILTER GND RESET
GND
LONG
10nF 10nF 18nF
17.4k
1%
3.3V
+
1000µF
V_OUT
1.8V
5A
10k
1%
10k 10k
µP
LOGIC
FAULT
RESET
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
For more information www.linear.com/LTC4216
4216fa
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