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Pin Description
Pin Name
NC
PG
FT
GND
SN
D
S
SP
Pin
Number
1, 3, 5, 7
2
4
6
8
9, 10, 11,
17
12, 13, 14
16
15
Description
Not Connected: Leave pins floating.
Control Circuitry Return: This pin is the floating return path for the controller circuitry.
Connect this pin via a resistor to the low side return (ground).
Fault Status Output: This open collector pin pulls low to indicate one of the several
potential fault conditions may exist. The Fault pin will pull low after a reverse or forward
fault has been detected with a defined delay time (8 μ s). In addition, the FT pin will pull
low when the controller input voltage is below the VC under-voltage threshold V S-PG < 7V
(V SUVF ). When V S-PG > 7.15V (V SUVR ) and 6mV < V SP-SN < 275mV this pin clears (High).
Leave this pin open if unused.
FT Return: This pin is the return (ground) for the open collector fault circuitry. Connect
this pin to logic ground.
Negative Sense Input: Connect SN pin to the trace between D pin (outside of the
PI2127 foot print) and the output load. The polarity of the voltage difference between SP
and SN provides an indication of current flow direction through the MOSFET.
Drain: The Drain of the internal N-channel MOSFET and fault level shift circuit. Connect
this pin to the output load.
Source-The source of the internal N-channel MOSFET and bias for the control circuitry.
Connect this pin to the input power source bus voltage.
Positive Sense Input: Connect SP pin to the trace between S pin (outside of the PI2127
foot print) and the input source. The polarity of the voltage difference between SP and
SN provides an indication of current flow direction through the MOSFET.
Package Pin-Out
17-pin LGA (7mm x 8mm)
Top view
Picor Corporation ? picorpower.com
PI2127
Rev 1.3
Page 2 of 19
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