19-1694; Rev 2; 12/07 EVALUATION KITAVAILABLE3V to 12V Current-Limiting Hot-Swap Controllerswith Autoretry, DualSpeed/BiLevel Fault ProtectionMAX4271/MAX4272/MAX4273General DescriptionFeatures 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 circuit cards into live backplanes. ♦ Unique Current Regulation Architecture The discharged filter capacitors of the circuit card pro- Minimizes n-FET Linear Mode Duration vide a low impedance to the live backplane. High in- ♦ Autoretry Feature (MAX4272/MAX4273) 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- tem reset. This family of hot-swap controllers prevents ♦ Power-On RESET (MAX4273) 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, two on-chip comparators provide DualSpeed/BiLevel™ ♦ Internal Charge Pump Generates Gate Drive for 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 ♦ unlatching (MAX4271), autoretry (MAX4272), or pro- Space-Saving 8-Pin SO, 16-Pin QSOP Packages grammed (MAX4273) methods. The MAX4271 family includes many integrated features ________________________Applications 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 cost, external n-FET. Integrated features like startup RAID current regulation and current glitch protection eliminate Remote-Access Servers ISDN external timing resistors and capacitors. Also featured are an open-drain status output to indicate a fault condi- tion, and an adjustable overcurrent response time. Ordering Information The MAX4271 (latched fault protection) and MAX4272 PIN-PKG (autoretry fault protection) come in 8-pin SO packages. PARTTEMP RANGEPACKAGECODE The MAX4273 (full function) comes in the space-saving 16-pin QSOP package and 16-pin SO package. All MAX4271 ESA -40°C to +85°C 8 SO S8-1 parts are specified across the extended temperature MAX4272 ESA -40°C to +85°C 8 SO S8-1 range, and have an absolute maximum rating of 15V to MAX4273 EEE -40°C to +85°C 16 QSOP E16-1 provide extra protection against inductive kickback dur- ing board removal. MAX4273ESE -40°C to +85°C 16 SO E16-1 DualSpeed/BiLevel is a trademark of Maxim Integrated Pin Configurations appear at end of data sheet. Products. Typical Operating Circuit BACKPLANE REMOVABLE CARD M1 RSENSE N 2.7V TO 13.2V VCC VOUT CBOARD IN SENSE GATE STAT STAT GND CSPD MAX4271 ON ON MAX4272 CTIM GND CTIM ________________________________________________________________ Maxim Integrated Products1For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.