MAX5949A/MAX5949B 19-3494 Rev 1 8/11 -48V Hot-Swap Controllers with External R SENSE General Description Features The MAX5949A/MAX5949B are hot-swap controllers that Allow Safe Board Insertion and Removal allow a circuit card to be safely hot plugged into a live from a Live -48V Backplane backplane. The MAX5949A/MAX5949B operate from Pin and Function Compatible with LT4250L -20V to -80V and are well-suited for -48V power systems. (MAX5949A) These devices are pin and function compatible with the LT4250 and pin compatible with the LT1640. Pin Compatible with LT1640L (MAX5949A) The MAX5949A/MAX5949B provide a controlled turn-on Pin and Function Compatible with LT4250H to circuit cards preventing glitches on the power-supply (MAX5949B) rail and damage to board connectors and components. The MAX5949A/MAX5949B provide undervoltage, over- Pin Compatible with LT1640H (MAX5949B) voltage, and overcurrent protection. These devices Circuit-Breaker Immunity to Input Voltage Steps ensure the input voltage is stable and within tolerance and Current Spikes before applying power to the load. Withstand -100V Input Transients with No Both the MAX5949A and MAX5949B protect a system External Components against overcurrent and short-circuit conditions by turn- ing off the external MOSFET in the event of a fault con- Programmable Inrush and Short-Circuit Current dition. The MAX5949A/MAX5949B also provide Limits protection against input voltage steps. During an input Operate from -20V to -80V voltage step, the MAX5949A/MAX5949B limit the cur- rent drawn by the load to a safe level without turning off Programmable Overvoltage Protection power to the load. Programmable Undervoltage Lockout Both devices feature an open-drain power-good status Power Up into a Shorted Load output (PWRGD for the MAX5949A or PWRGD for the MAX5949B) that can be used to enable downstream Power-Good Control Output converters. The MAX5949A/MAX5949B are available in an 8-pin SO package. Both devices are specified for the extended -40C to +85C temperature range. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE MAX5949AESA+ -40C to +85C 8 SO Telecom Line Cards MAX5949BESA+ -40C to +85C 8 SO Network Switches/Routers +Denotes a lead(Pb)-free/RoHS-compliant package. Central-Office Line Cards Server Line Cards Pin Configuration Base-Station Line Cards Central-Office Switching TOP VIEW -48V Distributed Power Systems Negative Power-Supply Controls + PWRGD 1 8 V DD (PWRGD) OV 2 7 DRAIN MAX5949A MAX5949B UV 3 6 GATE Typical Operating Circuit and Selector Guide appear at end V 4 5 SENSE EE of data sheet. SO ( ) FOR MAX5949B. 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 Through SENSE...................................................40mA EE Supply Voltage (V - V ).................................-0.3V to +100V Current into GATE...........................................................300mA DD EE PWRGD, PWRGD .................................................-0.3V to +100V Current into DRAIN .........................................-100mA to +20mA DRAIN (Note 1)........................................................-2V to +100V Current into Any Other Pin................................................20mA PWRGD to DRAIN ............................................. -0.3V to +95V Continuous Power Dissipation (T = +70C) A PWRGD to V ........................................................-95V to +85V 8-Pin SO (derate 5.9mW/C above +70C)..................471mW DD SENSE (Internally Clamped) .................................-0.3V to +1.0V 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 Lead Temperature (soldering, 10s) .................................+300C 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, 5) 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 (Note 3) 0.7 2 mA DD GATE DRIVE 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 Gate drive off, V = 2V, T = +25C 24 50 70 mA PD GATE A 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 , I = 30mA 15 16.4 18 V EE GSCLMP GATE EE GS CIRCUIT BREAKER Current-Limit Trip Voltage V V = V - V 40 50 60 mV CL CL SENSE EE SENSE Input Bias Current I V = 50mV 0 -0.2 -2 A SENSE SENSE UNDERVOLTAGE LOCKOUT Internal Undervoltage-Lockout V V increasing 13.8 15.4 17.0 V UVLOH DD Voltage High Internal Undervoltage-Lockout V V decreasing 11.8 13.4 15.0 V UVLOL DD Voltage Low UV PIN UV High Threshold V UV voltage increasing 1.240 1.255 1.270 V UVH UV Low Threshold V UV voltage decreasing 1.105 1.125 1.145 V UVL UV Hysteresis V 130 mV UVHY UV Input Bias Current I V = V 0-0.5 A INUV UV EE OV PIN OV High Threshold V OV voltage increasing 1.235 1.255 1.275 V OVH OV Low Threshold V OV voltage decreasing 1.210 1.235 1.255 V OVL OV Hysteresis V 20 mV OVHY OV Input Bias Current I V = V 0-0.5 A INOV OV EE 2 MAX5949A/MAX5949B