MAX4271/MAX4272/MAX4273 19-1694 Rev 2 12/07 3V to 12V Current-Limiting Hot-Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection General Description Features The MAX4271/MAX4272/MAX4273 comprise a com- Provide Safe Hot Swap for +3V to +12V Power plete family of integrated 3V to 12V hot-swap con- Supplies with Few External Components trollers. They allow the safe insertion and removal of Unique Current Regulation Architecture circuit cards into live backplanes. Minimizes n-FET Linear Mode Duration The discharged filter capacitors of the circuit card pro- Autoretry Feature (MAX4272/MAX4273) vide a low impedance to the live backplane. High in- rush currents from the backplane to the circuit card can DualSpeed/BiLevel Current Limit Protects Against burn up connectors and components, or momentarily Current Glitches and Short Circuits collapse the backplane power supply leading to a sys- Power-On RESET (MAX4273) tem reset. This family of hot-swap controllers prevents such problems by regulating the current to a preset 15V Absolute Maximum Rating Protects Against limit when the board is plugged in, allowing the system Inductive Kickbacks During Board Removal to stabilize safely. After the startup cycle is completed, Internal Charge Pump Generates Gate Drive for two on-chip comparators provide DualSpeed/BiLevel protection against short circuits, load glitches, and External n-MOSFET overcurrent conditions. In the event of a fault condition, Status Output Pin Indicates Fault/Safe Condition the load is disconnected. Fault recovery is handled by Space-Saving 8-Pin SO, 16-Pin QSOP Packages unlatching (MAX4271), autoretry (MAX4272), or pro- grammed (MAX4273) methods. Applications The MAX4271 family includes many integrated features that reduce component count and design time. An on- Base Stations Network Routers and board charge pump provides the gate drive for a low- Switches RAID cost, external n-FET. Integrated features like startup ISDN current regulation and current glitch protection eliminate Remote-Access Servers external timing resistors and capacitors. Also featured are an open-drain status output to indicate a fault condi- Ordering Information tion, and an adjustable overcurrent response time. The MAX4271 (latched fault protection) and MAX4272 PIN- PKG PART TEMP RANGE (autoretry fault protection) come in 8-pin SO packages. PACKAGE CODE The MAX4273 (full function) comes in the space-saving -40C to +85C 8 SO S8-1 MAX4271ESA 16-pin QSOP package and 16-pin SO package. All parts are specified across the extended temperature MAX4272ESA -40C to +85C 8 SO S8-1 range, and have an absolute maximum rating of 15V to -40C to +85C E16-1 MAX4273EEE 16 QSOP provide extra protection against inductive kickback dur- MAX4273ESE -40C to +85C 16 SO E16-1 ing board removal. DualSpeed/BiLevel is a trademark of Maxim Integrated Pin Configurations appear at end of data sheet. Products. Typical Operating Circuit BACKPLANE REMOVABLE CARD M1 R SENSE N 2.7V TO 13.2V V CC V OUT C BOARD IN SENSE GATE STAT STAT GND CSPD MAX4271 ON ON MAX4272 CTIM GND C TIM Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE3V to 12V Current-Limiting Hot-Swap Controllers with Autoretry, DualSpeed/BiLevel Fault Protection ABSOLUTE MAXIMUM RATINGS IN to GND ............................................................................+15V Current into INC, ON (Note 2) ............................................2mA STAT, OUTC, LLMON, AUXVCC to GND...............-0.3V to +14V Current into Any Other Pin ...............................................50mA GATE to GND ..............................................-0.3V to (V + 8.5V) Continuous Power Dissipation (T = +70C) IN A GATE to LLMON (Note 1).........................................-1V to +8.5V 8-Pin SO (derate 5.9mW/C above +70C)..................471mW INC, ON to GND (Note 2) .........................................-1V to +14V 16-Pin QSOP (derate 8.3mW/C above +70C)...........667mW CEXT to GND...............................................-8.5V to (V + 0.3V) 16-Pin SO (derate 8.7mW/C above +70C)................696mW IN CSPD, CTON, Operating Temperature Range ...........................-40C to +85C REF to GND ...........-0.3V to the lower of (V + 0.3V) or +12V Storage Temperature Range .............................-65C to +150C IN VSENSE, RTH, CTIM to GND.......................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C IN Note 1: GATE can be pulled below LLMON, but current must be limited to 2mA. Note 2: INC and ON can be pulled below ground. Limiting the current to 2mA ensures that these pins are never lower than about -0.8V. 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 = +2.7V to +13.2V, T = -40C to +85C, unless otherwise noted. Typical values are at V = +5V and T = +25C.) (Note 3) IN A IN A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES Input Voltage Range V 2.7 13.2 V IN Supply Current I V = V 0.6 1 mA Q ON IN CURRENT CONTROL T = +25C 455055 A Slow Comparator Threshold V V - V mV SC,TH IN SENSE T = T to T 43.5 56 A MIN MAX C = floating 10 20 40 s SPD Slow Comparator Response t CSPD Time C = 100nF to GND 10 20 40 ms SPD 5k on T = +25C 455055 A RTH to T = T to T 43.5 56 V A MIN MAX IN MAX4273 75k T = +25C 675 750 825 A only Fast Comparator Threshold V mV FC,TH on RTH T = T to T 650 840 to V A MIN MAX IN RTH = GND 180 200 220 MAX4271/MAX4272 Fast Comparator Response 10mV overdrive, from overload condition to t 350 ns FCD Time gate discharging SENSE Input Bias Current I V = V 0.2 10 A B,SENSE SENSE IN MOSFET DRIVER MAX4271/MAX4272 C = 100nF 21 31 41 TIM ms Startup Period t MAX4273 C = 100nF 21 31 41 START TON (Notes 4, 5) No capacitor 5.5 s Gate Charge Current I GATE = IN (Note 6) 100 A GATE 2 MAX4271/MAX4272/MAX4273