PI2003
Series
Universal Active ORing Controller IC
Description
Features
The PI2003 solution is a universal high- Optimized for -48V ORing applications
speed Active ORing controller IC designed for use
Fast Dynamic Response to Power Source
with N-channel MOSFETs and is optimized for -48V
failures, with 160ns reverse current turn-off
redundant power system architectures. The PI2003
delay time
Cool-ORing controller enables an extremely low
4A gate discharge current
power loss solution with fast dynamic response to
Accurate MOSFET drain-to-source voltage
input power fault conditions, critical for high
sensing to indicate system level fault conditions
availability systems. The PI2003 controls single or
Low quiescent current enables biasing directly
parallel MOSFETs to address Active ORing
from -48V (GND).
applications protecting against power source
100V for 100ms operation in low side
failures. The PI2003 is optimized for -48V low-side
applications
Active ORing applications. An internal VC shunt
Active low fault flag output
regulator enables biasing of the controller directly
from -48V (GND).
Applications
Low-side -48Vbus Active ORing
The gate drive output turns the MOSFET on during
N+1 Redundant Power Systems
normal steady state operation, while achieving high-
Servers & High End Computing
speed turn-off during input power source fault
conditions, that cause reverse current flow, with Telecom Systems
auto-reset once the fault clears. The MOSFET
High current Active ORing
drain-to-source voltage is monitored to detect
normal forward, excessive forward, light load and
Package Information
reverse current flow. The PI2003 provides an active
low fault flag output to the system during excessive
The PI2003 is offered in the following packages:
forward current, reverse current and light load.
10 Lead 3mm x 3mm DFN package
8 Lead SOIC package
Typical Applications:
Figure 1: PI2003 Low-Side Active ORing
Picor Corporation picorpower.com PI2003 Rev 1.1 Page 1 of 16
Pin Description
Pin Pin Number
Name
Description
10 Lead 8 Lead
DFN SOIC
GND 1 1 Ground: This pin is ground for the gate driver and control circuitry.
Gate Drive Output: This pin drives the gate of the external N-channel MOSFET.
Under normal operating conditions, the GATE pin pulls high to VC-0.5V. The
GATE 2 2
controller turns the gate off during a reverse current fault that exceeds the reverse
voltage threshold.
Controller Input Supply: This pin is the supply pin for the control circuitry and gate
driver. Connect a 1 F capacitor between VC pin and the GND pin. Voltage on this pin
VC 3 3
is limited to 11V by an internal shunt regulator. For high voltage auxiliary supply
applications connect a shunt resistor between VC and the auxiliary supply.
Fault Clamp Input: Connect the FT pin to FC when it is pulled by a resistor to a
5 4
FC
voltage higher than the VC pin to clamp it to VC plus a diode. Leave this pin open if
unused.
Fault State Output: This open collector pin pulls low when a fault occurs. Fault logic
6 5 inputs are VC Under-Voltage, Reverse Current, Forward Over-Current, and light load.
FT
Leave this pin open if unused.
Positive Sense Input & Clamp: Connect SP pin to the Source pin of the external N-
channel MOSFET close to the GND pin. The polarity of the voltage difference
SP 7 6
between SP and SN provides an indication of current flow direction through the
MOSFET.
Negative Sense Input & Clamp: Connect SN to the Drain pin of the external N-
SN 8 7 channel MOSFET. The polarity of the voltage difference between SP and SN provides
an indication of current flow direction through the MOSFET.
Package Pin-Outs
10 Lead DFN (3mm x 3mm) 8 Lead SOIC (5mm x 6mm)
Top view Top view
Picor Corporation picorpower.com PI2003 Rev 1.1 Page 2 of 16