Cool-Switch Series
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PI2161
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60 Volt, 12 Amp Full-Function Load Disconnect Switch Solution
Description
Features
The Cool-Switch PI2161 is a complete full-function
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Load Disconnect Switch solution for medium voltage
applications with a high-speed electronic circuit
breaker and a very low on-state resistance
MOSFET. It is designed to protect an input power
bus from output load fault conditions. The PI2161
Cool-Switch solution is offered in an extremely small,
thermally enhanced 7mm x 8mm LGA package. The
PI2161 enables an extremely low power loss
solution with fast dynamic response to an over
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Integrated High Performance 12A, 8.5 mΩ
MOSFET
Very small, high density fully-optimized solution
with simple PCB layout
Programmable latching over-current detection
Fast 120ns disconnect response to load failures
Low loss current sensing
Fast disable via EN pin, typically 200ns.
Load Status output (VO scaled load voltage)
current fault or EN high conditions. The PI2161
senses a small portion of the total MOSFET current
and has a low voltage threshold allowing the use of
low power sense resistors.
The switch is closed when the EN input is low and
is open when EN is high. Once enabled, the PI2161
monitors the MOSFET current through a sense
resistor. If an over current level is sensed, the switch
is quickly latched off to prevent the power source
from being overloaded. Bringing the EN pin high
will reset the over current latch allowing retry. The
PI2161 has an internal 10kΩ bias resistor connected
between the Drain (D) and VC to eliminate need for
external resistor in a 44V bus application (41V to
48V).
Typical Application:
Figure 1: PI2161 High Side Disconnect switch
Applications
? N+1 Redundant Power Systems
? Servers & High End Computing
? Load Disconnect
? High Side Circuit Breaker
Package Information
The PI2161 is offered in the following package:
? 17-pin 7mm x 8mm thermally enhanced LGA
package, achieving <10°C/W R θJ -PCB
Figure 2: PI2161 response time to output short fault
condition
Picor Corporation ? pi corpower.com
PI2161
Rev 1.1 , Page 1 of 18
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