MAX5948A/MAX5948B 19-3473 Rev 1 8/11 -48V Hot-Swap Controllers with External R SENSE General Description Features The MAX5948A/MAX5948B are hot-swap controllers Allow Safe Board Insertion and Removal from a that allow a circuit card to be safely hot plugged into a Live -48V Backplane live backplane. The MAX5948A/MAX5948B operate Pin- and Function-Compatible with from -20V to -80V and are well-suited for -48V power LT1640AL/LT1640L (MAX5948A) systems. The MAX5948A is pin- and function-compati- ble with both the LT1640AL and LT1640L. The Pin- and Function-Compatible with MAX5948B is pin- and function-compatible with both LT1640AH/LT1640H (MAX5948B) the LT1640AH and LT1640H. Withstand -100V Input Transients with No The MAX5948A/MAX5948B provide a controlled turn-on External Components to circuit cards preventing glitches on the power-supply Operate from -20V to -80V rail and damage to board connectors and components. Programmable Inrush and Short-Circuit Current The MAX5948A/MAX5948B provide undervoltage, over- voltage, and overcurrent protection. These devices Limits ensure the input voltage is stable and within tolerance Programmable Overvoltage Protection before applying power to the load. Programmable Undervoltage Lockout Both the MAX5948A and MAX5948B protect a system Power Up into a Shorted Load against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition. Power-Good Control Output Both devices feature an open-drain power-good status output, PWRGD for MAX5948A or PWRGD for Ordering Information MAX5948B, that can be used to enable downstream PART TEMP RANGE PIN-PACKAGE converters. MAX5948AESA+ -40C to +85C 8 SO The MAX5948A/MAX5948B are available in an 8-pin SO package. Both devices are specified for the extended MAX5948BESA+ -40C to +85C 8 SO -40C to +85C temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. Applications Selector Guide Central-Office Switching Network Switches/Routers PART PWRGD POLARITY MAX5948AESA Active Low (PWRGD) Server Line Cards MAX5948BESA Active High (PWRGD) Base-Station Line Cards Pin Configuration TOP VIEW PWRGD 1 8 V DD (PWRGD) OV 2 7 DRAIN MAX5948A MAX5948B UV 3 6 GATE V 4 5 SENSE EE SO ( ) FOR MAX5948B. Typical Operating Circuit appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.-48V Hot-Swap Controllers with External R SENSE ABSOLUTE MAXIMUM RATINGS (All voltages are referenced to V , unless otherwise noted.) Current into Any Other Pin................................................20mA EE Supply Voltage (V - V ).................................-0.3V to +100V Current into Drain............................................-100mA to +20mA DD EE PWRGD, PWRGD .................................................-0.3V to +100V Continuous Power Dissipation (T = +70C) A DRAIN (Note 1)........................................................-2V to +100V 8-Pin SO (derate 5.9mW/C above +70C)...................471mW SENSE ....................................................................-0.3V to +20V Operating Temperature Range ...........................-40C to +85C GATE (internally clamped) .....................................-0.3V to +18V Junction Temperature .....................................................+150C UV and OV..............................................................-0.3V to +60V Storage Temperature Range .............................-65C to +150C Current through SENSE....................................................20mA Lead Temperature (soldering, 10s) .................................+300C Current into GATE...........................................................300mA Soldering Temperature (reflow) .......................................+260C Note 1: Test condition per Figure 1. DRAIN current must be limited to the specified 100mA maximum. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 0V, V = 48V, T = -40C to +85C. Typical values are at T = +25C, unless otherwise noted.) (Notes 2, 3) EE DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES Operating Input Voltage Range V 20 80 V DD Supply Current I V = 3V, OV = V , SENSE = V 0.7 2 mA DD UV EE EE GATE DRIVER AND CLAMPING CIRCUITS Gate Pin Pullup Current I GATE drive on, V = V -30 -45 -60 A PU GATE EE Gate Pin Pulldown Current I Any fault condition, V = 2V 24 50 70 mA PD GATE External Gate Drive V V - V , 20V V 80V 10 13.5 18 V GATE GATE EE DD GATE to V Clamp Voltage V V - V , current into GATE = 30mA 15 16.4 18 V EE GSCLMP GATE EE CIRCUIT BREAKER Current-Limit Trip Voltage V V = V - V 40 50 60 mV CB CB SENSE EE SENSE Input Bias Current I V = 50mV 0 -0.03 -1 A SENSE SENSE UV PIN UV High Threshold V UV low to high transition 1.213 1.243 1.272 V UVH UV Low Threshold V UV high to low transition 1.198 1.223 1.247 V UVL UV Hysteresis V 20 mV UVHY UV Input Bias Current I V = V 0-0.5A INUV UV EE OV PIN OV High Threshold V OV low to high transition 1.198 1.223 1.247 V OVH OV Low Threshold V OV high to low transition 1.165 1.203 1.232 V OVL OV Hysteresis V 20 mV OVHY OV Input Bias Current I V = V 0-0.5A INOV OV EE PWRGD OUTPUT SIGNAL REFERENCED TO DRAIN DRAIN Input Bias Current I V = 48V 10 80 250 A DRAIN DRAIN P ow er - G ood Thres hol d V V - V , high to low transition 1.1 1.4 2.0 V PG DRAIN EE P ow er - G ood Thres hol d H yster esisV 0.4 V PGHY 2 MAX5948A/MAX5948B