MAX5921/MAX5939 19-2946 Rev 1 2/06 -48V Hot-Swap Controllers with External R and High Gate Pulldown Current SENSE General Description Features The MAX5921/MAX5939 hot-swap controllers allow a cir- Allows Safe Board Insertion and Removal cuit card to be safely hot plugged into a live backplane. from a Live -48V Backplane The MAX5921/MAX5939 operate from -20V to -80V and Pin-Compatible with LT1640 and LT4250 are well suited for -48V power systems. These devices are pin compatible with both the LT1640 and LT4250 and Circuit Breaker Immunity to Input Voltage Steps provide improved features over these devices. and Current Spikes The MAX5921/MAX5939 provide a controlled turn-on to 450mA GATE Pulldown Current During Short- circuit cards preventing damage to board connectors, Circuit Condition board components, and preventing glitches on the power-supply rail. The MAX5921/MAX5939 provide Exponential GATE Pulldown Current undervoltage, overvoltage, and overcurrent protection. Withstands -100V Input Transients with No These devices ensure that the input voltage is stable External Components and within tolerance before applying power to the load. Both the MAX5921 and MAX5939 protect a system Programmable Inrush and Short-Circuit Current against overcurrent and short-circuit conditions by turn- Limits ing off the external MOSFET in the event of a fault con- Operates from -20V to -80V dition. The MAX5921/MAX5939 protect against input voltage steps by limiting the load current to a safe level Programmable Overvoltage Protection without turning off power to the load. Programmable Undervoltage Lockout The device features an open-drain power-good status with Built-In Glitch Filter output, PWRGD or PWRGD for enabling downstream Overcurrent Fault Integrator converters (see Selector Guide). A built-in thermal shut- down feature is also included to protect the external Powers Up into a Shorted Load MOSFET in case of overheating. The MAX5939 features Power-Good Control Output a latched fault output. The MAX5921 contains built-in autoretry circuitry after a fault condition. Thermal Shutdown Protects External MOSFET The MAX5921/MAX5939 are available in an 8-pin SO package and operate in the extended -40C to +85C Ordering Information temperature range. PART TEMP RANGE PIN-PACKAGE Applications MAX5921AESA -40C to +85C 8 SO Telecom Line Cards MAX5921BESA -40C to +85C 8 SO Network Switches/Routers Ordering Information continued at end of data sheet. Central-Office Line Cards Server Line Cards Pin Configuration Base-Station Line Cards TOP VIEW PWRGD 1 8 V DD (PWRGD) OV 2 7 DRAIN Typical Operating Circuit and Selector Guide appear at end MAX5921 of data sheet. MAX5939 UV 3 6 GATE V 4 5 SENSE EE SO () FOR MAX5921B/F AND MAX5939B/F. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.-48V Hot-Swap Controllers with External R and High Gate Pulldown Current SENSE ABSOLUTE MAXIMUM RATINGS All Voltages Are Referenced to V , Unless Otherwise Noted Current into GATE...........................................................+300mA EE Supply Voltage (V - V )................................-0.3V to +100V Current into Any Other Pin................................................+20mA DD EE DRAIN, PWRGD, PWRGD ....................................-0.3V to +100V Continuous Power Dissipation (T = +70C) A PWRGD to DRAIN ............................................. -0.3V to +95V 8-Pin SO (derate 5.9mW/C above +70C)..................471mW PWRGD to V .......................................................-95V to +85V Operating Temperature Range ...........................-40C to +85C DD SENSE (Internally Clamped) .................................-0.3V to +1.0V Junction Temperature .....................................................+150C GATE (Internally Clamped) ....................................-0.3V to +18V Storage Temperature Range .............................-65C to +150C UV and OV..............................................................-0.3V to +60V Lead Temperature (soldering, 10s) .................................+300C Current into SENSE...........................................................+40mA 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, unless otherwise noted. Typical values are at T = +25C, unless otherwise noted.) (Notes 1, 4) EE DD A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES Operating Input Voltage Range V 20 80 V DD Current into V with UV = 3V, OV, DRAIN, DD Supply Current I 0.7 2 mA DD SENSE = V , GATE = floating EE GATE DRIVER AND CLAMPING CIRCUITS Gate Pullup Current I GATE drive on, V = V -30 -45 -60 A PU GATE EE Gate Pulldown Current I V - V = 100mV, V = 2V (Note 2) 24 50 70 mA PD SENSE EE GATE External Gate Drive V V - V , steady state, 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 Current I V = 50mV -1 -0.2 0A SENSE SENSE UNDERVOLTAGE LOCKOUT Supply Internal Undervoltage V V increasing 13.8 15.4 17.0 V UVLOH DD Lockout Voltage High Supply Internal Undervoltage V V decreasing 11.8 13.4 15.0 V UVLOL DD Lockout Voltage Low UV INPUT 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 Current I UV = V -0.5 0A INUV EE OV INPUT OV High Threshold V OV voltage rising 1.235 1.255 1.275 V OVH OV Low Threshold V OV voltage decreasing 1.189 1.205 1.221 V OVL OV Voltage Reference Hysteresis V 50 mV OVHY OV Input Current I OV = V -0.5 0A INOV EE 2 MAX5921/MAX5939