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Pin Description
Pin Name
EN
VO
VC
PG
SP
SL
SN
Pin
Number
1
2
3
4
5
6,7
8
Description
Enable: Logic level input, active low allows switch to reach 8.5m Ω typical in the on state
within 2ms. A logic high input will turn the switch off in typically 200ns. Leave this pin open
to allow switch to turn on after application of input power.
Load Status Output: This pin pulls to the load voltage once the switch is enabled through
an internal 150 kΩ resistor. Connect a resistor from this pin to ground to scale the load
voltage to the appropriate logic or analog level. Ground this pin if unused.
Voltage Bias: This pin is the supply pin for the control circuitry and gate driver. Connect a
0.1μF capacitor between the VC pin and the PG pin. Voltage on this pin is regulated to
11.7V with respect to PG by an internal shunt regu lator. A 10kΩ internal resistor (R D-VC ) is
connected between D pin and VC pin.
Control Circuitry Return: PG is the floating return path for the controller circuitry. Connect
Sense-Positive Input: Connect the SP pin to the SL pin side of the sense resistor as a
Kelvin connection. The magnitude of the voltage difference between SP and SN provides
an indication of the current through the sense resistor and the SL section of the MOSFET.
Source Low: A low percentage of the internal N-channel MOSFET source current passes
through this to the sense resistor. Refer to the Current Sense section in the Functional
Description .
Sense-Negative Input: Connect the SN pin to the SH pin side of the sense resistor as a
Kelvin connection. The magnitude of the voltage difference between SP and SN provides
an indication of the current through the sense resistor and the SL section of the MOSFET.
SH
D
9, 10, 11, Source High: The Source of the internal N-channel MOSFET section providing the majority
17 of the load current and alternate bias to the control circuitry.
12, 13, 14, Drain: The Drain of the internal N-channel MOSFET, connect to the input power source bus
16 voltage that provides the current to the load.
GND
15
Ground: This pin is the return (ground) for the enable circuitry. Connect this pin to the
logic/system power ground.
Package Pin-Outs
7mm x 8mm 17 Pin LGA
Top view pin-out
Picor Corporation ? pi corpower.com
PI2161
Rev 1.1 , Page 2 of 18
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