MAX5938 19-3320 Rev 1 1/05 -48V Hot-Swap Controller with V Step Immunity, IN No R , and Overvoltage Protection SENSE General Description Features The MAX5938 is a hot-swap controller for -10V to -80V -10V to -80V Operation rails. The MAX5938 allows circuit line cards to be safely No External R Required SENSE hot-plugged into a live backplane without causing a glitch on the power supply. It integrates an adjustable Drives Large Power MOSFETS circuit-breaker function requiring no R . SENSE Eliminates Inrush Current Spikes During Hot Plug The MAX5938 provides a controlled turn-on for circuit into Powered Backplane cards, which limits inrush current and prevents both glitches on the power-supply rail and damage to board Eliminates Inrush Current Spikes and Dropping of connectors and components. Before startup, the Load During Large V Steps IN MAX5938 performs a Load Probe test to detect the Adjustable Circuit-Breaker Threshold with presence of a short-circuit condition. If a short-circuit Temperature Compensation condition does not exist, the device limits the inrush cur- rent drawn by the load by gradually turning on the exter- Circuit-Breaker Fault with Transient Rejection nal MOSFET. Once the external MOSFET is fully Shorted Load Detection (Load Probe) Before enhanced, the MAX5938 provides overcurrent and short- Power MOSFET Turn-On circuit protection by monitoring the voltage drop across the R of the external power MOSFET. The DS(ON) Programmable Load-Voltage Slew Rate Controls MAX5938 integrates a 400mA fast GATE pulldown to Inrush Current guarantee that the external MOSFET is rapidly turned off 2.4% Accuracy, Programmable Turn-On/Off in the event of an overcurrent or short-circuit condition. Voltage (UVLO) The MAX5938 also protects the system against input voltage (V ) steps. During an input voltage step, the IN Overvoltage Fault Protection with Transient device limits the current drawn by the load to a safe level Rejection without shutting down the load. The device also includes Autoretry and Latched Fault Management ON/OFF control, selectable PGOOD output polarity, Available undervoltage (UV) and overvoltage (OV) protection. The device offers latched (MAX5938L) or autoretry Low Quiescent Current (1mA) (MAX5938A) fault management. Both the MAX5938A and MAX5938L are available in a 16-pin QSOP package Ordering Information and are specified for the extended (-40C to +85C) PART TEMP RANGE PIN-PACKAGE temperature range. MAX5938AEEE -40C to +85C 16 QSOP Applications MAX5938LEEE -40C to +85C 16 QSOP Servers Telecom Line Cards Pin Configuration Network Switches TOP VIEW Solid-State Circuit Breakers GND 1 16 PGOOD Network Routers N.C. 2 15 N.C. OFF 3 14 V OUT ON 4 MAX5938 13 N.C. OV 5 12 CB ADJ STEP MON 6 11 GATE Typical Operating Circuit appears at end of data sheet. POL SEL 7 10 N.C. V 9 LP 8 EE Load Probe is a trademark of Maxim Integrated Products, Inc. QSOP 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 Controller with V Step Immunity, IN No R , and Overvoltage Protection SENSE ABSOLUTE MAXIMUM RATINGS V , V , PGOOD, LP, GATE (during 2V clamp, continuous) .............................50mA EE OUT STEP MON to GND............................................+0.3V to -85V GATE (during gate pulldown, continuous)......................50mA PGOOD to V .....................................................-0.3V to +85V Continuous Power Dissipation (T = +70C) OUT A V , LP, STEP MON to V .................................-0.3V to +85V 16-Pin QSOP (derate 8.3mW/C above +70C)...........667mW OUT EE GATE to V ...........................................................-0.3V to +20V Operating Temperature Range ...........................-40C to +85C EE ON, OFF, OV, POL SEL, CB ADJ to V ................-0.3V to +6V Junction Temperature .....................................................+150C EE Input Current Storage Temperature Range ............................-65C to +150C LP (internally duty-cycle limited)..........................................1A Lead Temperature (soldering, 10s) ................................+300C PGOOD (continuous)......................................................80mA GATE (during 15V clamp, continuous) ...........................30mA 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 = -10V to -80V, V = (GND - V ), V =V , R = 200 , V = V = 2V, V = V = V , POL SEL open, T IN EE ON OFF OV CB ADJ EE EE STEP MON EE LP A = -40C to +85C, unless otherwise noted. Typical values are at V = -48V, T = +25C.) (Notes 1, 2) EE A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V Referenced to GND -80 -10 V EE Operating Supply Current I 0.95 1.4 mA CC ON/OFF, OV ON Reference Threshold Rising V V increasing 1.219 1.25 1.281 V ON REF,R ON ON Reference Threshold Falling V V decreasing 1.069 1.125 1.181 V ON REF,F ON ON Glitch Rejection (Note 3) t V decreasing 0.80 1.5 2.25 ms REJ ON OFF Reference Threshold V 1.219 1.25 1.281 V OFF REF ON/OFF/OV Input Bias Current I -25 +25 nA BIAS OV Reference Threshold, Rising V V increasing 1.219 1.25 1.281 V OV REF,R OV OV Reference Threshold, Falling V V decreasing 1.069 1.125 1.181 V OV REF,F OV OV Transient Rejection t OV increasing 0.80 1.5 2.25 ms OVREJ Power-Up Delay (Note 4) t 80 220 380 ms ONDLY V = V = -80V, V = GND, OFF EE OUT V to V Leakage Current 0.01 1A OUT EE PGOOD open LP to V Leakage Current V = V = -80V, LP = GND 0.01 1A EE OFF EE POL SEL to V Input Current POL SEL = V -50 -34 -20 A EE EE GATE DRIVE V = 10V 6.5 6.8 7.2 IN External Gate-Drive Voltage V V - V V GS GATE EE 14V < V < 80V 8.1 10 12.8 IN I = 9mA 13.5 16 MOSFET fully CLAMP enhanced I = 20mA 17 19.5 CLAMP GATE to V Clamp Voltage V EE I = 1mA 2.1 2.55 Power-off, CLAMP V = GND EE I = 10mA 2.5 2.93 CLAMP Open-Loop Gate Charge Current I V = V , V = GND -66 -52 -35 A G,ON GATE EE OUT V > 10V 9.0 14.1 GATE Pulldown Switch V - V = IN GATE EE R mA G,OFF On-Resistance 500mV V > 14V 7.5 12.5 IN Output-Voltage Slew Rate SR l dV /dt l, C = 0 2.4 9.0 14.8 V/ms OUT SLEW 2 MAX5938