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Vicor Corporation

PI2122 Datasheet Preview

PI2122 Datasheet

12Amp Active ORing Solution

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PI2122
Cool-ORing Series
12Amp Active ORing Solution With Load Disconnect
Description
The Cool-ORing PI2122 is a complete full-function
Active ORing solution with a high-speed ORing
MOSFET controller and a very low on-state
resistance Dual MOSFETs designed for use in
redundant power system architectures. The PI2122
Cool-ORing solution is offered in an extremely small,
thermally enhanced LGA package and can be used
in low voltage (5Vbus) high side Active ORing
applications. The PI2122 enables extremely low
power loss with fast dynamic response to fault
conditions, critical for high availability systems. The
PI2122 provide true bi-directional switch capabilities
to protect against both power source and load fault
conditions.
A load short circuit detection feature allows user
definition of a short condition enabling minimum duty
cycle into a short. The PI2122 has the added benefit
of being able to protect against output load fault
conditions that may induce excessive forward
current and device over-temperature by turning off
the back-to-back MOSFETs with an auto-retry
programmable off-time. The back-to-back MOSFETs
drain-to-drain voltage is monitored to detect normal
forward, excessive forward, light load and reverse
current flow. The status is reported via an active low
www.DaftaaSuhlteeftl4aUg.coomutput. A temperature sensing function
turns off the MOSFETs and indicates a fault if the
controller junction temperature exceeds 145°C.
Typical Application:
Features
Integrated High Performance 12A, 6mΩ back-to-
back MOSFET
Very-small, high density fully-optimized solution
providing simple PCB layout.
Fast Dynamic Response, with 140ns reverse &
170ns forward over-current turn-off delay time
Accurate sensing capability to indicate system
fault conditions
Programmable under & over-voltage functions
Over temperature shutdown
Programmable over-current off time
Programmable short circuit load detection
Active low fault flag output
Applications
N+1 Redundant Power Systems
Servers & High End Computing
High-side Active ORing
High current Active ORing ( 5Vbus)
MicroTCA
Package
5mm x 7mm 17-pin Thermally Enhanced LGA
Package
Figure 1: PI2122 High Side Active ORing
Picor Corporation • picorpower.com
Figure 1: PI2122 input current de-rating based on
PI2122
Rev1.0
Page 1 of 19




Vicor Corporation

PI2122 Datasheet Preview

PI2122 Datasheet

12Amp Active ORing Solution

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Pin Description
Pin Number Pin Name
1, 15, 16, 17,
22,23, 24, 25
2, 3, 4, 5,
18,19,20, 21
D2
D1
6 SP
7 FT
8 SCD
9 OCT
10 VC
11 GND
12 OV
13
www.DataSheet4U.com
14
UV
SN
Package Pin-out
Description
Drain 2- Drain 2 of the internal Dual N-channel MOSFETs, connect to the output
load.
Drain 1- Drain 1 of the internal Dual N-channel MOSFETs, connect to the input
voltage.
Positive Sense Input & Clamp: Connect SP pin to the D1 pin. The polarity and
magnitude of the voltage difference between SP and SN provides an indication of
current flow direction through the MOSFETs.
Fault State Output: This open collector output pulls low after the 40usec fault timer
delay when a fault condition occurs. Fault logic inputs are VC Under-Voltage, input
Under-Voltage, input Over-Voltage, Forward Over-Current, Reverse Current, Low
Forward Current (or shorted switches) and Over-Temperature. Leave this pin open
if unused.
Short Circuit Detect Input: This input pin is for setting the load voltage where a
short circuit level is defined and detected. To enable slow MOSFET turn-on mode,
connect SCD to VC. Connect to load point for minimum threshold (0.335V) or use
resistor divider to increase threshold. Grounding pin enables the fast MOSFET turn
on mode.
Over Current Duty Cycle Input: Connecting a capacitor (20nF) sets the gate off
time once an over-current condition is detected. No capacitor on this pin will result
in minimum off time; 40µs. Pulling this input low will disable Gate drive.
Controller Input Bias: Provides power to the controller. Connect a 1μF capacitor
between VC pin and ground. For high voltage applications connect a shunt resistor
between VC and the input supply. Voltage on this pin is regulated to 15.5V in high
voltage applications.
Ground: This pin is ground for the control circuitry.
Input Over Voltage Input: The OV pin detects when the input is greater than the
Over-Voltage threshold resulting in a low Fault pin. OV “AND” a Forward Current
condition turns the MOSFETs off. The input voltage OV threshold is programmable
through an external resistor divider. Connect OV to GND to disable this function.
Input Under Voltage Input: The UV pin detects when the input is less than the
Under-Voltage threshold resulting in a low Fault pin. The input voltage UV
threshold is programmable through an external resistor divider. During an Under-
Voltage fault, the Gate is pulled low. Connect UV to VC to disable this function.
Negative Sense Input & Clamp- Connect SN to D2 pin. The polarity and
magnitude of the voltage difference between SP and SN provides an indication of
current flow direction through the MOSFETs.
Picor Corporation • picorpower.com
17 Pin LGA (5mm x 7mm)
Top view
PI2122
Rev1.0
Page 2 of 19


Part Number PI2122
Description 12Amp Active ORing Solution
Maker Vicor Corporation
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PI2122 Datasheet PDF






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