MAX5911/MAX5912 19-1832 Rev 0a 1/01 -48V Simple Swapper Hot-Swap Switches General Description Features The MAX5911/MAX5912 are fully integrated hot-swap Provides Safe Hot Swap for -16V to -65V Power switches for negative supply rails. These devices allow Supplies the safe insertion and removal of circuit cards into live 280mA Current Limit for MAX5911 backplanes or ports without causing problematic glitch- es on the negative power-supply rail. They also monitor 415mA Current Limit for MAX5912 various circuit parameters and disconnect the load if a Zero-Current Load Disconnect fault condition occurs, alerting the host with a logic-level FAULT output. The MAX5911/MAX5912 operate over a Integrated Power FET voltage range of -16V to -65V and are designed to permit Status Output Reports Fault Condition hot plugging of an IP phone into a hub, but are not limit- ed to that operation. Internal Switch-Protection Circuitry During startup, an internal power FET regulates the cur- Built-In Thermal Shutdown rent between the backplane power source and the load to 280mA for MAX5911 and 415mA for MAX5912. After DGND Can Vary Up to 5V with Respect to AGND startup, the FET is fully enhanced to reduce its on-resis- tance. To ensure robust operation, the MAX5911/ Ordering Information MAX5912 contain built-in safety features that prevent damage to the internal FET. They include an enable PART TEMP. RANGE PIN-PACKAGE input, which responds to positive logic signals (+3.3V or MAX5911ESA -40C to +85C 8 SO +5V), allowing the host system to disconnect the load. MAX5912ESE -40C to +85C 16 SO ENABLE is also used to reset the device after a latching fault condition occurs. Simple Swapper is a trademark of Maxim Integrated Products, Inc. The MAX5911/MAX5912 Simple Swapper hot-swap ICs monitor four parameters for these fault conditions: Pin Configurations undervoltage lockout (UVLO), power-not-good, zero- current detection, and thermal shutdown. These TOP VIEW devices are available in the extended temperature range, -40C to +85C. The MAX5911 and MAX5912 GATE UVLO 1 8 come in 8-pin and 16-pin SOIC packages, respectively. V V IN 2 7 OUT MAX5911 FAULT 3 6 AGND Applications DGND 4 5 ENABLE IP Phones Internet Appliances Network Routers Power-Over-LAN 8 SO Network Switches 1 16 N.C.* N.C.* Typical Operating Circuit 2 15 UVLO N.C.* GATE 3 14 V OUT V (-48V) V V IN IN OUT +3.3V 0.1 F 4 13 V IN V IN MAX5911 MAX5912 MAX5912 V 5 12 V IN IN UVLO LOAD 3.3k AGND 6 11 FAULT FAULT ENABLE DGND 7 10 POSITIVE ENABLE LOGIC 8 9 N.C.* N.C.* DGND AGND 16 SO AGND DGND *THESE PINS ARE NOT INTERNALLY CONNECTED. Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.-48V Simple Swapper Hot-Swap Switches ABSOLUTE MAXIMUM RATINGS Voltages are with respect to AGND, unless otherwise noted. V ..........................................................................+0.3V to -70V Continuous Output Current...............................Internally Limited IN V ............................................................+0.3V to (V - 0.3V) Continuous Power Dissipation (T = +70C) OUT IN A ENABLE to DGND ..................................................-0.3V to +11V 8-Pin SO (derate 5.9mW/C above +70C)..................470mW ENABLE to V .......................................................-0.3V to +70V 16-Pin SO (derate 12.9mW/C above +70C)...........1039mW IN FAULT to DGND.....................................................-0.3V to +11V Operating Temperature Range ...........................-40C to +85C UVLO to V ............................................................-0.3V to +11V Junction Temperature......................................................+150C IN DGND..........................................................................-5V to +5V Storage Temperature Range .............................-60C to +150C DGND to V ...........................................................-0.3V to +70V Lead Temperature (soldering, 10s) .................................+300C IN FAULT Sink Current ............................................................10mA 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 SPECIFICATIONS (V = -48V, AGND = DGND = 0, UVLO = open circuit, V = +3.3V, and T = -40C to +85C, unless otherwise noted. Typical IN ENABLE A values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V -65 -16 V IN Measured at AGND at the end of output Supply Current I 1.5 2.5 mA IN voltage slew MAX5911 -310 -280 -250 Maximum V Current I V = V + 5V mA OUT OUT(MAX) OUT IN MAX5912 -457 -415 -373 MAX5911 I = -225mA, OUT DMOS On-Resistance R 2.5 4 DS(ON) MAX5912 I = -350mA OUT Measured on V when internal DMOS is OUT V Leakage Current 10 A OUT shut off ENABLE Low Voltage V Referenced to DGND 0.8 V IL ENABLE High Voltage V Referenced to DGND 2.0 V IH ENABLE High Input Current I V = +3.3V 140 300 A IH ENABLE ENABLE Low Pulse Width t 200 ns EPW (Note 1) FAULT Output Low Voltage V I = 3mA 0.4 V OL FAULT FAULT Output Leakage Current I V = +3.3V 10 A OH FAULT Zero-Current Detection IF Decreasing load current -12 -8 -4 mA TH Threshold Zero-Current Detection IF 1.5 mA HY Threshold Hysteresis Zero-Current Detection Delay IF 280 350 520 ms DEL (Note 2) Current-Limit Delay (Note 3) t V shorted to AGND 10 20 s LIMIT OUT Power-Good Threshold V V - V , V - V decreasing 1.95 2.15 2.35 V PG IN OUT IN OUT Power-Good Hysteresis PG % of V 5% HYS PG 2 MAX5911/MAX5912