PI2211 Positive Low Voltage (0.9V to 14V) Hot Swap Controller and Circuit Breaker with True-SOA Description: Features: The PI2211 hot swap controller and circuit breaker ensures Operating range: +0.9 to +14V safe system operation during circuit card insertion by limiting Programmable inrush current limiting the start-up or in-rush current to the load and eliminating the Programmable MOSFET True-SOA Protection electrical disturbance or possible voltage sag imposed on a Programmable circuit breaker with Glitch-Catcher backplane power supply. During steady state operation, the voltage suppression PI2211 acts as a circuit breaker disconnecting from the 100nS circuit breaker fault detection time backplane power source if a overcurrent condition arises. Adjustable Input Under-voltage Lockout (UVLO) with The PI2211 uses an external N-channel MOSFET and employs hysteresis the MOSFETs transient thermal characteristics (supplied by Adjustable Input Over-voltage Lockout (OVLO) with the MOSFET supplier) to ensure operation within the hysteresis MOSFETs dynamic safe operating area (SOA). Power good status indicator o o Wide operation temperature from -40 C to 125 C The PI2211, with True-SOA, continuously monitors MOSFET power to calculate the MOSFET junction temperature rise and Applications determines proper operation regardless of load conditions. Base Station Power Distribution Systems The PI2211 limits the MOSFET junction temperature rise to a Server Backplanes Systems maximum of 60C preventing overheating (hot spotting) by Live Board Insertion / Removal cycling the MOSFET on/off and allowing it to cool for a period Circuit Breaker with Voltage Clamp determined by the programmed MOSFET package thermal properties. Emulation and protection based on the specific Package MOSFETs transient thermal performance optimizes the safe operating limits and allows designers to take advantage of 24-Pin QFN 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. Typical Application: Figure 1 Typical PI2211 application schematic. Picor Corporation picorpower.com PI2211 Rev 1.1, Page 1 of 26 PI2211 Pin Descriptions Pin Pin Name Description Number BUS 7 Bus input power. VCC 6 Positive supply input. Derived internally from BUS for voltages > 4.5Vdc, externally from VAUX for lower BUS voltages. UV/EN 20 BUS voltage sense for under-voltage fault. An enable or disable for the controller. OV 19 BUS voltage sense for over-voltage fault. CSP 8 Current sense positive location input. CSN 10 Current sense negative location input. DRN 9 MOSFET drain sense . SRC 12 MOSFET source sense. GDR 11 MOSFET gate drive. PWRGD 21 Power good indicator. GND 13, 14, 15 Controller ground reference. SEL 16 Programming option for SOA programming with external resistors. RACC 24 Internal current programming resistor. TIMER 23 Programmable delay timer to inhibit the start of the controller. SOAS 22 SOA current programming resistor. SOAR 4 SOA thermal programming resistor. SOAT 3 SOA transient response programming resistor. - 1, 2, 5, 17, No connects, pins are to be left floating. 18 TAB TAB No electrical connection receiving footprint is required to achieve a R of 46C/W. Can be J-A electrically connected to PI2211 GND only. Ordering Information Part Number Description PI2211-00-QAIG 24 lead QFN package Picor Corporation picorpower.com PI2211 Rev 1.1, Page 2 of 26