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MAX5937AC Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX5937AC Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 23 page -48V Hot-Swap Controllers with VIN Step Immunity and No RSENSE ________________________________________________________________ Maxim Integrated Products 1 19-3281; Rev 1; 1/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. General Description The MAX5936/MAX5937 are hot-swap controllers for -10V to -80V rails. The MAX5936/MAX5937 allow circuit line cards to be safely hot-plugged into a live back- plane without causing a glitch on the power supply. These devices integrate a circuit-breaker function requiring no RSENSE. The MAX5936/MAX5937 provide a controlled turn-on for circuit cards, limiting inrush, preventing glitches on the power-supply rail, and preventing damage to board connectors and components. Before startup, the devices perform a Load Probe™ test to detect the presence of a short-circuit condition. If a short-circuit condition does not exist, the device limits the inrush current drawn by the load by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the MAX5936/MAX5937 provides overcur- rent and short-circuit protection by monitoring the volt- age drop across the RDS(ON) of the external power 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. The MAX5936/MAX5937 protect the system against input voltage (VIN) steps by providing VIN step immuni- ty. The MAX5936/MAX5937 provide an accurate UVLO voltage. The MAX5936 has an open-drain, active-low PGOOD output and the MAX5937 has an open-drain, active-high PGOOD output. The MAX5936/MAX5937 are offered with 100mV, 200mV, and 400mV circuit-breaker thresholds, in addi- tion to a non-circuit-breaker option. These devices are offered in latched and autoretry fault management, are available in 8-pin SO packages, and specified for the extended (-40°C to +85°C) temperature range (see the Selector Guide). Applications Servers Telecom Line Cards Network Switches Solid-State Circuit Breaker Network Routers Features o -10V to -80V Operation o No RSENSE Required o Drives Large Power MOSFETS o Programmable Inrush Current Limit During Hot Plug o 100mV, 200mV, 400mV, and No-Circuit-Breaker Threshold Options o Circuit-Breaker Fault with Transient Rejection o Shorted Load Detection (Load Probe) Before Power MOSFET Turn-On o ±2.4% Accurate Undervoltage Lockout (UVLO) o Autoretry and Latched Fault Management Available o Low Quiescent Current GATE LP VEE 1 2 8 7 PGOOD (PGOOD) VOUT UVLO STEP_MON GND SO TOP VIEW 3 4 6 5 MAX5936 MAX5937 ( ) FOR THE MAX5937. Pin Configuration Load Probe is a trademark of Maxim Integrated Products, Inc. Ordering Information PART TEMP RANGE PIN-PACKAGE MAX5936_ _ESA -40°C to +85°C 8 SO MAX5937_ _ESA -40°C to +85°C 8 SO Note: The first “_” represents A for the autoretry and L for the latched fault management option. The second “_” represents the circuit-breaker threshold. See the Selector Guide for additional information. Selector Guide and Typical Operating Circuit appear at end of data sheet. |
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