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Picor Corporation · picorpower.com

PI2211

Rev 1.1, Page 1 of 26

PI2211

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Positive Low Voltage (0.9V to 14V) Hot Swap Controller and Circuit Breaker with True-SOA™

Description:

The PI2211 hot swap controller and circuit breaker ensures

safe system operation during circuit card insertion by limiting

the start-up or in-rush current to the load and eliminating the

electrical disturbance or possible voltage sag imposed on a

backplane power supply. During steady state operation, the

PI2211 acts as a circuit breaker disconnecting from the

backplane power source if a overcurrent condition arises.

The PI2211 uses an external N-channel MOSFET and employs

the MOSFET’s transient thermal characteristics (supplied by

the MOSFET supplier) to ensure operation within the

MOSFET’s dynamic safe operating area (SOA).

The PI2211, with True-SOA™, continuously monitors MOSFET

power to calculate the MOSFET junction temperature rise and

determines proper operation regardless of load conditions.

The PI2211 limits the MOSFET junction temperature rise to a

maximum of 60°C preventing overheating (hot spotting) by

cycling the MOSFET on/off and allowing it to cool for a period

determined by the programmed MOSFET package thermal

properties. Emulation and protection based on the specific

MOSFET’s transient thermal performance optimizes the safe

operating limits and allows designers to take advantage of

the latest power MOSFET technologies.

During a circuit breaker fault, the PI2211 internal Glitch-

Catcher™ circuit acts as an active snubber, passing inductive

bus energy through the MOSFET mitigating the need for

additional BUS input transient protection and protects

against MOSFET avalanching.

Features:



Operating range: +0.9 to +14V



Programmable inrush current limiting



Programmable MOSFET True-SOA™ Protection



Programmable circuit breaker with Glitch-Catcher™

voltage suppression



100nS circuit breaker fault detection time



Adjustable Input Under-voltage Lockout (UVLO) with

hysteresis



Adjustable Input Over-voltage Lockout (OVLO) with

hysteresis



Power good status indicator



Wide operation temperature from -40

Applications



Base Station Power Distribution Systems



Server Backplanes Systems



Live Board Insertion / Removal



Circuit Breaker with Voltage Clamp

Package



24-Pin QFN

Typical Application:

Figure 1 – Typical PI2211 application schematic.