LTC2955 Pushbutton On/Off Controller with Automatic Turn-On Fea T Descrip T n Automatic Turn-On Via Voltage Monitor Input The LTC 2955 is a micropower, pushbutton on/off control- n Wide Input Supply Range: 1.5V to 36V ler that manages system power by generating a clean enable n Low Supply Current: 1.2A output from the supply monitor input and the debounced n 25kV ESD HBM on PB Input pushbutton input. It features an interrupt output that n 36V Wide Input Voltage for PB Input notifies the system of a pushbutton or low supply event. n Low Leakage EN Output Allows DC/DC Converter When the system is ready, it may use the power kill input Control (LTC2955-1) to shut off power. If the pushbutton remains pressed for n High Voltage EN Output Drives External P-Channel more than the configurable turn-off duration, the system MOSFET (LTC2955-2) power is forced off. n Simple Interface Allows Graceful P Shutdown The supply input covers a wide range from 1.5V to 36V. n Adjustable Turn-Off Timer The robust pushbutton input handles wide voltage swings n 10-Lead 3mm 2mm DFN and 8-Lead ThinSOT of 36V and ESD strikes to 25kV (human body model) Packages without latchup or damage. A low 1.2A supply current maximizes battery run time. Separate versions are avail- able for positive or negative enable polarities. a T 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. n GPS Devices n Portable Instruments n Automotive Electronics Typical a T Automatic Turn-On with Power-Fail Indication Pushbutton On/Off with Interrupt V = 5.4V TRIP LT3008-3.3 TURN ON PULSE SHORT PULSE LONG PULSE 3.3V V V 8.4V IN OUT PB SHDN R7 1M 1M EN V TURNS ON STAYS ON TURNS OFF IN EN LTC2955DDB-1 0.1F 2.32M SEL INT P ON KILL INT PGD 402k PB INTERRUPT INTERRUPT TMR GND 2955 TA01b POWER-FAIL 2955 TA01a 2955fa 1 For more information www.linear.com/LTC2955 ion pplica ions pplica ion uresLTC2955 a Te Maxi Mu M r a T (Note 1) V ............................................................. 0.3V to 40V IN Operating Temperature Range Input Voltages LTC2955C ................................................ 0C to 70C PB ........................................................... 40V to 40V LTC2955I .............................................40C to 85C ON ......................................................... 0.3V to 40V Storage Temperature Range .................. 65C to 150C SEL ........................................................ 0.3V to 40V Lead Temperature (Soldering, 10 sec) KILL ......................................................... 0.3V to 6V TSOT-23 Package .............................................300C Output Voltages EN/EN .................................................... 0.3V to 40V INT ........................................................... 0.3V to 6V PGD ......................................................... 0.3V to 6V TMR ...................................................... 0.3V to 2.7V p in c F T TOP VIEW TOP VIEW 1 10 INT ON 2 9 PGD KILL ON 1 8 INT KILL 2 7 EN/EN* 3 11 *EN/EN 8 TMR TMR 3 6 V IN 4 7 V SEL IN GND 4 5 PB 5 6 PB GND TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 DDB PACKAGE 10-LEAD (3mm 2mm) PLASTIC DFN T = 125C, = 195C/W JMAX JA *PIN 7 IS EN FOR LTC2955-1 T = 125C, = 55C/W JMAX JA AND IS EN FOR LTC2955-2 EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL *PIN 3 IS EN FOR LTC2955-1 AND IS EN FOR LTC2955-2 o r Der i n F Ma T (