PI2002 TM Cool-ORing Series Active ORing Controller IC with Load Disconnect Feature Description Features The PI2002 Cool-ORingTM solution is a high-speed Active ORing controller IC with a load disconnect feature designed for use with back-to-back Nchannel MOSFETs in redundant power system architectures. The PI2002 Cool-ORing controller enables an extremely low power loss solution with fast dynamic response to fault conditions, critical for high availability systems. The PI2002 controls backto-back MOSFETs providing true bi-directional switch capabilities to protect against both power source and load fault conditions. * * The gate drive output turns the MOSFETs on in normal steady state operation, while achieving highspeed turn-off during input power source fault conditions, that cause reverse current flow, with auto-reset once the fault clears. The PI2002 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 removing gate drive from 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 PI2002 provides an active low fault flag output to the system during fault condition. A temperature sensing function turns off the MOSFETs and indicates a fault if the junction temperature exceeds 145C. * * * * * * * Power Source & Load Fault Protection Fast Dynamic Response, with 120ns reverse & 150ns forward over-current turn-off delay time 4A gate discharge current Accurate back-to-back MOSFETs drain-to-drain voltage sensing to indicate system level fault conditions Programmable under & over-voltage detection Over temperature fault detection Programmable over-current Gate off time Programmable short circuit load detection function Active low fault flag output Applications * * * * * N+1 Redundant Power Systems Servers & High End Computing Telecom Systems Active ORing with Load Disconnect High current Active ORing Package Options The PI2002 is offered in the following packages: * 3mm x 3mm 10 Lead TDFN package * 8 Lead SOIC Typical Applications: Figure 1b: PI2002 Low Side Disconnect Switch Figure 1a: PI2002 High Side ORing with load disconnect Picor Corporation * picorpower.com PI2002 Rev1.1 Page 1 of 23 Pin Description Pin Name Pin Number 10-Pin DFN SO-8 GND 1 1 GATE 2 2 VC 3 3 OCT 4 4 SCD 5 n/a FT 6 5 SP 7 6 SN 8 7 UV 9 8 OV 10 n/a Description Ground: This pin is ground for the gate driver and control circuitry. Gate Drive Output: This pin drives the gates of the external Back-to-Back Nchannel MOSFETs. Under normal operating conditions, the GATE pin pulls high to 10V (typ) with respect to the SN pin. The controller turns the gate off during all fault conditions except the Low Forward Current condition. Controller Input Supply: This pin is the supply pin for the control circuitry and gate driver. Connect a 1F capacitor between VC pin and the GND pin. Voltage on this pin is limited to 15.5V by an internal shunt regulator. For high voltage auxiliary supply applications connect a shunt resistor between VC and the auxiliary supply. Over-Current Timer 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, 40s. Pulling this input low will disable Gate drive. 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. This pin is not available in the SO-8 package and the controller is set for low Gate source current, 300A. Fault State Output: This open collector output pulls low 40s after a fault condition occurs. Fault logic inputs are VC Under-Voltage, input Under-Voltage, input OverVoltage, Forward Over-Current, Reverse Current, Low Forward Current (or shorted switches) and Over-Temperature. Leave this pin open if unused. Positive Sense Input & Clamp: Connect SP pin to the input power source side of the MOSFETs. The polarity and magnitude of the voltage difference between SP and SN provides an indication of current flow through the MOSFETs. Negative Sense Input & Clamp: Connect SN to the output load side of the MOSFET. The polarity and magnitude of the voltage difference between SP and SN provides an indication of current flow through the MOSFETs. Input Under-Voltage Input: The UV pin is used 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 UnderVoltage fault, the Gate is pulled low. Connect UV to VC to disable this function. 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. This pin is not available in the SO-8 package and OV function is disabled. Package Pin-Outs 10 Lead TDFN (3mm x 3mm) Top view Picor Corporation * picorpower.com 8 Lead SOIC (5mm x 6mm) Top view PI2002 Rev1.1 Page 2 of 23 Absolute Maximum Ratings VC -0.3V to 17.3V / 40mA SP, SN, OV, OCT -0.3V to 8.0V / 10mA -0.3V to 17.3V / 10mA UV, SCD, FT GATE -0.3V to 17.3V / 5A GND -0.3V / 5A peak Storage Temperature -65oC to 150oC -40oC to Thermal shutdown Operating Junction Temperature 250oC Lead Temperature (Soldering, 20 sec) ESD Rating 2kV HBM Electrical Specifications Unless otherwise specified: -40C < TJ < 125C, VC =12V, CVc = 1uF, COCT = 2nF, CGATE = 4nF Parameter Symbol Min VVC-GND 4.5 Typ Max Units Conditions 13.2 V 3.7 4.2 mA 15.5 16 V No VC Limiting Resistors Normal Operating Conditions No Faults IVC=10mA 7.5 Delta IVC=10mA 4.5 V VC Supply Operating Supply Range(3) Quiescent Current IVC Clamp Voltage VVC-CLM VC Clamp Shunt Resistance 15 RVC VC Under-Voltage Rising Threshold VVCUVR VC Under-Voltage Falling Threshold VVCUVF VC Under-Voltage Hysteresis 4.3 4.0 4.15 V VVCUVHS 150 mV Under-Voltage Rising Threshold VUVR 500 Under-Voltage Falling Threshold VUVF Under-Voltage Threshold Hysteresis VUVHS FAULT Under-Voltage Bias Current IUV Over-Voltage Rising Threshold VOVR Over-Voltage Falling Threshold VOVF Over-Voltage Threshold Hysteresis IOV Fault Output Low Voltage VFTL Fault Output High Leakage Current I FT-LC Fault Delay Time tFT-DEL Over Temperature Fault (1) Picor Corporation * picorpower.com (1) mV 25 mV 500 440 1 A 540 mV 475 mV 25 mV -1 200 20 mV 475 -1 VOV-HS Over-Voltage Bias Current Over Temperature Fault Hysteresis 440 540 40 1 A 500 mV IFT=2mA, VC>4.5V 10 A VFT=14V 60 s Includes output glitch filter TFT 145 C TFT-HS -10 C PI2002 Rev1.1 Page 3 of 23 Electrical Specifications Unless otherwise specified: -40C < TJ < 125C, VC =12V, CVc = 1uF, COCT = 2nF, CGATE = 4nF Parameter Symbol Min Typ Max Units Conditions GATE DRIVER VG = 1V, Normal Operating Conditions, No Faults VSCD=0V VG = 1V, Normal Operating Conditions, No Faults VSCD=Vc Gate Source Current IG-SC -1.5 mA Gate Source Current IG-SC -0.30 mA 4.0 A 0.3 VG = 1.5V @ 25C 0.2 V TRVS-DLY + 50nsec Pull Down Peak Current(1) IG-PD Gate Pull-down Resistance (1) RG-PD AC Gate Pull-down Voltage (1) VG-PD DC Gate Pull-down Voltage to GND Gate Voltage @ VC UVLO Gate Fault Condition Clear (1) Gate to SN Clamp Voltage 1.5 VG-PD 0.8 1.2 V IG=100mA, in reverse fault VG-UVLO 0.7 1 V IG =10A, 1.5