LTC2951-1/LTC2951-2 Pushbutton On/Off Controller FEATURES DESCRIPTION n Adjustable Pushbutton Debounce and Delay Timers The LTC 2951 is a micropower, wide input voltage range n Low Supply Current: 6A pushbutton ON/OFF controller. The part contains a push- n Wide Operating Voltage Range: 2.7V to 26.4V button input which controls the toggling of an open-drain n EN Output (LTC2951-1) Allows DC/DC Converter enable output. The pushbutton turn OFF debounce time Control is externally programmable, while the turn ON debounce n EN Output (LTC2951-2) Allows Circuit Breaker time is fixed at 128ms. A simple microprocessor interface Control allows for proper system housekeeping prior to power- n Simple Interface Allows Graceful P Shutdown down. Under system fault conditions, an adjustable KILL n High Input Voltage PB Pin with Internal Pull-Up timeout delay ensures proper power-down. Resistor The LTC2951 operates over a 2.7V to 26.4V input voltage n 10kV ESD HBM on PB Input range to accommodate a variety of input power supplies. n Accurate 0.6V Threshold on KILL Comparator Input Very low quiescent current (6A typical) makes the TM n 8-Pin 3mm 2mm DFN and ThinSOT Packages LTC2951 ideally suited for battery powered applications. Two versions of the part are available to accommodate APPLICATIONS either positive or negative enable polarities. The parts n Portable Instrumentation Meters are available in 8-pin 3mm 2mm DFN and ThinSOT n Blade Servers packages. n Portable Customer Service PDA L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks Desktop and Notebook Computers are the property of their respective owners. TYPICAL APPLICATION V IN Turn-On Debounce 2.7V TO 26.4V V V IN OUT DC/DC BUCK SHDN** EN R1 V EN IN 10k 2V/DIV LTC2951-1 INT INT 128ms P/C PB PB KILL KILL GND KILLT OFFT C * C * KILLT OFFT 2951 TA01b 0.033F 0.033F 25ms/DIV *OPTIONAL 2951 TA01 **SHDN INTERNALLY PULLED UP BY DC/DC 295112fb 1LTC2951-1/LTC2951-2 (Note 1) ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) ..................................0.3V to 33V Operating Temperature Range IN Input Voltages LTC2951C-1 ............................................. 0C to 70C PB .............................................................6V to 33V LTC2951C-2 ............................................. 0C to 70C KILLT .................................................... 0.3V to 2.7V LTC2951I-1 ...........................................40C to 85C OFFT ..................................................... 0.3V to 2.7V LTC2951I-2 ..........................................40C to 85C KILL ........................................................0.3V to 7V Storage Temperature Range Output Voltages DFN Package ..................................... 65C to 125C INT ......................................................... 0.3V to 10V TSOT-23 .............................................65C to 150C EN/EN .................................................... 0.3V to 10V Lead Temperature (Soldering, 10 sec) ...................300C PIN CONFIGURATION TOP VIEW TOP VIEW GND 1 8 INT V 1 8 KILL IN KILLT 2 7 EN/EN PB 2 7 OFFT 9 PB 3 6 OFFT KILLT 3 6 EN/EN V KILL 4 5 IN GND 4 5 INT TS8 PACKAGE DDB PACKAGE 8-LEAD PLASTIC TSOT-23 8-LEAD (3mm 2mm) PLASTIC DFN T = 125C, = 140C/W JMAX JA T = 125C, = 165C/W JMAX JA EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2951CDDB-1 PBF LTC2951CDDB-1 TRPBF LBTB 8-Lead (3mm 2mm) Plastic DFN 0C to 70C LTC2951CDDB-2 PBF LTC2951CDDB-2 TRPBF LBTD 8-Lead (3mm 2mm) Plastic DFN 0C to 70C LTC2951IDDB-1 PBF LTC2951IDDB-1 TRPBF LBTB 8-Lead (3mm 2mm) Plastic DFN 40C to 85C LTC2951IDDB-2 PBF LTC2951IDDB-2 TRPBF LBTD 8-Lead (3mm 2mm) Plastic DFN 40C to 85C LTC2951CTS8-1 PBF LTC2951CTS8-1 TRPBF LTBTC 8-Lead Plastic TSOT 0C to 70C LTC2951CTS8-2 PBF LTC2951CTS8-2 TRPBF LTBTF 8-Lead Plastic TSOT 0C to 70C LTC2951ITS8-1 PBF LTC2951ITS8-1 TRPBF LTBTC 8-Lead Plastic TSOT 40C to 85C LTC2951ITS8-2 PBF LTC2951ITS8-2 TRPBF LTBTF 8-Lead Plastic TSOT 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: