MAX5936/MAX5937 19-3281 Rev 1 1/05 -48V Hot-Swap Controllers with V IN Step Immunity and No R SENSE General Description Features The MAX5936/MAX5937 are hot-swap controllers for -10V to -80V Operation -10V to -80V rails. The MAX5936/MAX5937 allow circuit No R Required SENSE line cards to be safely hot-plugged into a live back- plane without causing a glitch on the power supply. Drives Large Power MOSFETS These devices integrate a circuit-breaker function Programmable Inrush Current Limit During Hot requiring no R . SENSE Plug The MAX5936/MAX5937 provide a controlled turn-on 100mV, 200mV, 400mV, and No-Circuit-Breaker for circuit cards, limiting inrush, preventing glitches on Threshold Options the power-supply rail, and preventing damage to board connectors and components. Before startup, the Circuit-Breaker Fault with Transient Rejection devices perform a Load Probe test to detect the Shorted Load Detection (Load Probe) Before presence of a short-circuit condition. If a short-circuit condition does not exist, the device limits the inrush Power MOSFET Turn-On current drawn by the load by gradually turning on the 2.4% Accurate Undervoltage Lockout (UVLO) external MOSFET. Once the external MOSFET is fully Autoretry and Latched Fault Management enhanced, the MAX5936/MAX5937 provides overcur- rent and short-circuit protection by monitoring the volt- Available age drop across the R of the external power DS(ON) Low Quiescent Current MOSFET. The MAX5936/MAX5937 integrate a 400mA fast GATE pulldown to guarantee that the power MOSFET is rapidly turned off in the event of an overcur- rent or short-circuit condition. Ordering Information The MAX5936/MAX5937 protect the system against input voltage (V ) steps by providing V step immuni- IN IN PART TEMP RANGE PIN-PACKAGE ty. The MAX5936/MAX5937 provide an accurate UVLO MAX5936 ESA -40C to +85C 8 SO voltage. The MAX5936 has an open-drain, active-low MAX5937 ESA -40C to +85C 8 SO PGOOD output and the MAX5937 has an open-drain, active-high PGOOD output. Note: The first represents A for the autoretry and L for the latched fault management option. The MAX5936/MAX5937 are offered with 100mV, The second represents the circuit-breaker threshold. 200mV, and 400mV circuit-breaker thresholds, in addi- See the Selector Guide for additional information. tion to a non-circuit-breaker option. These devices are offered in latched and autoretry fault management, are Selector Guide and Typical Operating Circuit appear at end available in 8-pin SO packages, and specified for the of data sheet. extended (-40C to +85C) temperature range (see the Selector Guide). Applications Pin Configuration Servers TOP VIEW Telecom Line Cards Network Switches PGOOD GND 1 8 (PGOOD) Solid-State Circuit Breaker UVLO 2 7 V OUT Network Routers MAX5936 MAX5937 STEP MON 3 6 GATE V 4 5 LP EE SO Load Probe is a trademark of Maxim Integrated Products, Inc. ( ) FOR THE MAX5937. 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 V IN Step Immunity and No R SENSE ABSOLUTE MAXIMUM RATINGS V , V , PGOOD (PGOOD), LP, GATE (during 15V clamp, continuous) ...........................30mA EE OUT GATE (during 2V clamp, continuous) .............................50mA STEP MON to GND............................................+0.3V to -85V PGOOD (PGOOD) to V ....................................-0.3V to +85V GATE (during gate pulldown, continuous)......................50mA OUT Continuous Power Dissipation (T = +70C) PGOOD (PGOOD), LP, STEP MON to V ............-0.3V to +85V EE A 8-Pin SO (derate 5.9mW/C above +70C)..................471mW GATE to V ...........................................................-0.3V to +20V EE UVLO to V .............................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C EE Junction Temperature .....................................................+150C Input Current LP (internally, duty-cycle limited).........................................1A Storage Temperature Range ............................-65C to +150C Lead Temperature (soldering, 10s) ................................+300C PGOOD (PGOOD) (continuous) .....................................80mA 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, UVLO open, T = -40C to +85C, unless otherwise noted. EE IN EE STEP MON EE LP A 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 V lV l increasing -33.5 -31.0 -29.5 UVLO,R EE Default V Undervoltage Lockout V EE V lV l decreasing -28 UVLO,F EE UVLO Reference Threshold, V V increasing 1.219 1.25 1.281 V UVLO REF,R UVLO V Rising EE UVLO Reference Threshold, V V decreasing 1.069 1.125 1.181 V UVLO REF,F UVLO V Falling EE UVLO Input Resistance 20 50 k UVLO Transient Rejection t 0.8 1.5 2.25 ms OVREJ Power-Up Delay (Note 3) t 80 220 380 ms ONDLY V and UVLO Glitch Rejection EE t 0.8 1.5 2.25 ms REJ (Note 4) V to V Leakage Current V = -80V, V = GND 0.01 1 A OUT EE EE OUT LP to V Leakage Current V = -80V, V = GND 0.01 1 A EE EE LP V = 10V 6.5 6.8 7.2 IN External Gate-Drive Voltage V V - V V GS GATE EE 14 V 80V 8.1 10 12.8 IN I = 9mA 13.5 16 CLAMP MOSFET fully enhanced I = 20mA 17 19.5 CLAMP GATE to V Clamp Voltage V EE I = 1mA 2.1 2.55 CLAMP Power-off, V = GND EE I = 10mA 2.5 2.9 CLAMP Open-Loop Gate-Charge Current V = V , V = GND -66 -52 -35 A GATE EE OUT V > 10V 9 14.1 IN GATE Pulldown Switch V - V = GATE EE R GATE On-Resistance 500mV V > 14V 7.5 12.5 IN Output-Voltage Slew Rate SR l dV /dt l 2.4 9 14.8 V/ms OUT 2 MAX5936/MAX5937