LTC2955 – Pushbutton On/Off Controller with Automatic Turn …

1 LTC295512955faFor more information = PPOWER-FAIL402kTypical applicaTion FeaTuresDescripTionPushbutton On/OffController with Automatic Turn-OnThe LTC 2955 is a micropower, Pushbutton On/Off control-ler that manages system power by generating a clean enable output from the supply monitor input and the debounced Pushbutton input. It features an interrupt output that notifies the system of a Pushbutton or low supply event. When the system is ready, it may use the power kill input to shut off power. If the Pushbutton remains pressed for more than the configurable turn-off duration, the system power is forced off.

2 The supply input covers a wide range from to 36V. The robust Pushbutton input handles wide voltage swings of 36V and ESD strikes to 25kV (human body model) without latchup or damage. A low A supply current maximizes battery run time. Separate versions are avail-able for positive or negative enable polarities. Pushbutton On/Off with InterruptapplicaTionsn Automatic Turn-On Via Voltage Monitor Inputn Wide Input Supply Range: to 36Vn Low Supply Current: An 25kV ESD HBM on PB Inputn 36V Wide Input Voltage for PB Inputn Low Leakage EN Output Allows DC/DC Converter Control ( LTC2955 -1)n High Voltage EN Output Drives External P-Channel MOSFET ( LTC2955 -2)n Simple Interface Allows Graceful P Shutdownn Adjustable Turn-Off Timern 10-Lead 3mm 2mm DFN and 8-Lead ThinSOT Packagesn Desktop and Notebook Computersn GPS Devicesn Portable Instrumentsn Automotive ElectronicsL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective owners. TURN ON PULSESHORT PULSELONG PULSETURNS ONSTAYS ONINTERRUPTINTERRUPTTURNS OFFPB2955 TA01bENINTA utomatic Turn-On with Power-Fail IndicationLTC295522955faFor more information conFiguraTionabsoluTe MaxiMuM raTingsVIN .. to 40 VInput Voltages PB .. 40V to 40V ON .. to 40V SEL .. to 40V KILL .. to 6 VOutput Voltages EN/EN .. to 40V INT .. to 6V PGD .. to 6V TMR .. to (Note 1)TOP VIEW11 DDB PACKAGE10-LEAD (3mm 2mm) PLASTIC DFNINTPGD*EN/ENVINPBONKILLTMRSELGND68791 054231 TJMAX = 125 C, JA = 55 C/W EXPOSED PAD (PIN 11) PCB GND CONNECTION OPTIONAL*PIN 3 IS EN FOR LTC2955 -1 AND IS EN FOR LTC2955 -212348765 TOP VIEWTS8 PACKAGE8-LEAD PLASTIC TSOT-23 INTEN/EN*VINPBONKILLTMRGNDTJMAX = 125 C, JA = 195 C/W *PIN 7 IS EN FOR LTC2955 -1 AND IS EN FOR LTC2955 -2orDer inForMaTionOperating Temperature Range LTC2955C.

4 0 C to 70 C LTC2955I .. 40 C to 85 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) TSOT-23 Package ..300 CLead Free FinishTAPE AND REEL (MINI)TAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC2955 CDDB-1#TRMPBFLTC2955 CDDB-1#TRPBFLGBJ10-Lead (3mm 2mm) Plastic DFN0 C to 70 CLTC2955 CDDB-2#TRMPBFLTC2955 CDDB-2#TRPBFLGBM10-Lead (3mm 2mm) Plastic DFN0 C to 70 CLTC2955 IDDB-1#TRMPBFLTC2955 IDDB-1#TRPBFLGBJ10-Lead (3mm 2mm) Plastic DFN 40 C to 85 CLTC2955 IDDB-2#TRMPBFLTC2955 IDDB-2#TRPBFLGBM10-Lead (3mm 2mm) Plastic DFN 40 C to 85 CLTC2955 CTS8-1#TRMPBFLTC2955 CTS8-1#TRPBFLTGBK8-Lead Plastic TSOT-230 C to 70 CLTC2955 CTS8-2#TRMPBFLTC2955 CTS8-2#TRPBFLTGBN8-Lead Plastic TSOT-230 C to 70 CLTC2955 ITS8-1#TRMPBFLTC2955 ITS8-1#TRPBFLTGBK8-Lead Plastic TSOT-23 40 C to 85 CLTC2955 ITS8-2#TRMPBFLTC2955 ITS8-2#TRPBFLTGBN8-Lead Plastic TSOT-23 40 C to 85 CTRM = 500 pieces.

5 *Temperature grades are identified by a label on the shipping LTC Marketing for parts specified with wider operating temperature more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.( #orderinfo)LTC295532955faFor more information characTerisTicsSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSS upplyVINS upply Voltage Supply AVUVLVIN Undervoltage LockoutVIN (HYST)VIN Undervoltage Lockout Hysteresisl3085200mVInput PinsVPB(MIN(MAX))PB Voltage Rangel 3636 VVPBPB Input ThresholdPB (HYST)PB Input Threshold Hysteresis (Note 3)40mVVPB(VOC)PB Open Circuit VoltageI = 1 Input Leakage Current6V < PB < 36V PB = 1V PB = 36Vl l l 1 4 10 8 400 A A AVONON ThresholdON (HYST)

6 ON HysteresisDFN Package Only40mVIONON Input Leakage CurrentON = 1V ON = 36Vl l 10 100nA nAVKILLKILL Input Threshold VoltageKILL (HYST)KILL Input Threshold Hysteresis (Note 3)30mVIKILLKILL Input Leakage CurrentKILL = 1Vl 50nAVSELSEL Input Input CurrentSEL = 1V SEL = 36Vl l 50 100nA nAOutput PinsVEN/EN(VOL)EN/EN Voltage Output LowI = (VOH)EN Voltage Output High ( LTC2955 -1)I = 0 A, (VOH)EN Voltage Output High ( LTC2955 -2)I = 0 A, AlVIN Pull-Up Current ( LTC2955 -1)EN = 0Vl 2 AIENEN Pull-Up Resistance ( LTC2955 -2) VINT(VOL)INT Voltage Output LowI = Leakage CurrentINT = 5Vl 50nAVPGD(VOH)PGD Voltage Output HighI = 0 A, (VOL)PGD Voltage Output LowI = Pull-Up CurrentPGD = 0Vl 2 AITMR(PU)TMR Pull-Up CurrentTMR = 0Vl 2 3 4 AITMR(PD)TMR Pull-Down CurrentTMR = A The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

7 VIN = 7V unless otherwise noted. (Note 2)LTC295542955faFor more information (ON)PB, ON Turn-On Debounce TimePB Falling or ON Rising Enable Assertedl193245mstDB(OFF)PB Interrupt Debounce TimePB Falling INT Fallingl193245mstTMRA dditional Turn-Off Debounce TimeCTMR = (MIN)Minimum INT Pulse WidthINT Falling TMR Risingl193245mstON(PD)ON Interrupt DelayON Falling INT Falling, VSEL > stPGD(PD)PGD Propagation DelayON Falling PGD Fallingl200 stKILL(PD)KILL Propagation DelayKILL Falling Enable Releasedl60 stKILL(PW)KILL Minimum Pulse Widthl60 stKILL(ON BLANK)KILL Turn-On Blanking (Note 4)KILL Low, Enable Asserted Enable Releasedl304512720mstEN(LOCK OUT)EN/EN Lockout Time (Note 5)Enable Released Enable characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

8 VIN = 7V unless otherwise noted. (Note 2)Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: All currents into pins are positive; all voltages are referenced to GND unless otherwise 3: Guaranteed by design, not subject to 4: The KILL turn-on blanking time is the waiting period immediately after the enable output is asserted. This blanking time allows sufficient time for the regulator and the P to perform power-up tasks. The KILL, PB, and ON inputs are ignored during this period.

9 Note 5: The enable lockout time is the waiting period immediately after the enable output is released. It allows an application to properly power-down such that the next power-up sequence starts from a consistent powered down configuration. PB and ON are ignored during this period. Typical perForMance characTerisTicsSupply Current vs TemperatureSupply Current vs Supply VoltageUndervoltage Lockout vs TemperatureVIN = 7V, TA = 25 C, unless otherwise ( C) 50 VUVL (V) 2525100125 TEMPERATURE ( C) 50 IVIN ( A) 2525100125 VIN (V)0 IVIN ( A) = 40 CTA = 25 CTA = 85 CLTC295552955faFor more information perForMance characTerisTicsTMR Pull-Up Current vs TemperatureEN Output High Voltage vs TemperatureEN Output High Voltage vs Supply VoltageEN/EN Output Low Voltage vs TemperaturePB Input Current vs PB VoltagePB Voltage vs External PB Resistance to GroundON/KILL Threshold vs TemperatureTurn-On Debounce Time vs TemperatureAdditional Turn-Off Debounce Time vs TMR External CapacitanceVIN = 7V, TA = 25 C, unless otherwise ( C) 50tDB(ON) (ms)3032313633050752955 G053534 2525100125 EXTERNAL PB RESISTANCE TO GROUND (k )0PB VOLTAGE (mV)

10 05010015030020010202955 G12250403050TA = 40 CTA = 25 CTA = 85 CTEMPERATURE ( C) 50 VON/KILL (V) 2525100125 TEMPERATURE ( C) 50 VEN(VOH) (V) 2525100125 TMR EXTERNAL CAPACITANCE (nF) 11tTMR (ms)100100001010010002955 G06101000 TEMPERATURE ( C) 50 ITMR(PU) ( A) G07 2525100125 VIN (V)1 VEN(VOH) (V) = 40 CTA = 25 CTA = 85 CPB VOLTAGE (V) 40 IPB ( A)40 40 80 200 12002955 G110 160 202040 TEMPERATURE ( C) 50 VEN/EN(VOL) (mV)50200150250300450350050752955 G10100400 2525100125 VIN = = 7VI = 1mALTC295562955faFor more information FuncTionsEN: Enable Output ( LTC2955 -1). EN is an active high output to control the turn- On/Off of the system power.