LTC2954 Pushbutton On/Off Controller with µP …

1 LTC295412954fbPushbutton On/Off Controller with P InterruptThe LTC 2954 is a Pushbutton On/Off Controller that manages system power via a Pushbutton interface. An enable output toggles system power while an interrupt output provides debounced Pushbutton status. The inter-rupt output can be used in menu driven applications to request a system power-down. A power kill input allows a microprocessor or system to reset the enable output, effectively powering down the system. Independently adjustable on and off timers allow dependable Pushbutton control of the enable output and resistance to accidental toggling of system LTC2954 operates over a wide to input volt-age range to accommodate a wide variety of input power supplies.

2 Very low quiescent current (6 A typical) makes the LTC2954 ideally suited for battery powered applications. Two versions of the part are available to accommodate either positive or negative enable , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Pushbutton PowerPath Controln Portable Instrumentation Metersn Blade Serversn Portable Customer Service PDAn Desktop and Notebook Computersn Adjustable Power On/Off Timersn Low Supply Current: 6 A n Wide Operating Voltage Range: to Low Leakage EN Output ( LTC2954 -1) Allows DC/DC Converter Controln High Voltage EN Output ( LTC2954 -2) Allows Circuit Breaker Controln Simple Interface Allows Graceful P Shutdownn High Input Voltage PB Pin with Internal Pull-Up Resistor n 10kV ESD HBM on PB Input n Accurate Threshold on KILL Comparator Inputn 8-Pin 3mm 2mm DFN and ThinSOT PackagesTYPICAL APPLICATION FEATURESDESCRIPTION APPLICATIONSP ushbutton On/Off with InterruptVINVOUTENINTKILLINTKILLLTC2954- 2 ONTPDTDC/DC P/ C9V10ktPDT = SECONDS100k100k2954 TA01a1 FPBGNDVIN+TURN-ON PULSETURNS ONSTAYS ONINTERRUPTINTERRUPTTURNS OFFSHORT PULSELONG PULSEPBINT2954 TA01bENLTC295422954fbSupply Voltage (VIN).

3 To 33 VInput VoltagesPB .. 6V to 33 VONT .. to .. to .. to 7V Output VoltagesINT .. to 10 VEN/EN .. to 33V(Note 1)Operating Temperature RangeLTC2954C-1 .. 0 C to 70 CLTC2954C-2 .. 0 C to 70 CLTC2954I-1 .. 40 C to 85 CLTC2954I-2 .. 40 C to 85 CStorage Temperature RangeDFN Package .. 65 C to 125 CTSOT-23 .. 65 C to 150 CLead Temperature (Soldering, 10 sec) .. 300 CABSOLUTE MAXIMUM RATINGSORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC2954 CDDB-1#PBFLTC2954 CDDB-1#TRPBFLCJG8-Lead (3mm 2mm) Plastic DFN0 C to 70 CLTC2954 CDDB-2#PBFLTC2954 CDDB-2#TRPBFLCNJ8-Lead (3mm 2mm) Plastic DFN0 C to 70 CLTC2954 IDDB-1#PBFLTC2954 IDDB-1#TRPBFLCJG8-Lead (3mm 2mm) Plastic DFN 40 C to 85 CLTC2954 IDDB-2#PBFLTC2954 IDDB-2#TRPBFLCNJ8-Lead (3mm 2mm)

4 Plastic DFN 40 C to 85 CLTC2954 CTS8-1#PBFLTC2954 CTS8-1#TRPBFLTCJH8-Lead Plastic TSOT-230 C to 70 CLTC2954 CTS8-2#PBFLTC2954 CTS8-2#TRPBFLTCNK8-Lead Plastic TSOT-230 C to 70 CLTC2954 ITS8-1#PBFLTC2954 ITS8-1#TRPBFLTCJH8-Lead Plastic TSOT-23 40 C to 85 CLTC2954 ITS8-2#PBFLTC2954 ITS8-2#TRPBFLTCNK8-Lead Plastic TSOT-23 40 C to 85 CLEAD BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC2954 CDDB-1 LTC2954 CDDB-1#TRLCJG8-Lead (3mm 2mm) Plastic DFN0 C to 70 CLTC2954 CDDB-2 LTC2954 CDDB-2#TRLCNJ8-Lead (3mm 2mm) Plastic DFN0 C to 70 CLTC2954 IDDB-1 LTC2954 IDDB-1#TRLCJG8-Lead (3mm 2mm) Plastic DFN 40 C to 85 CLTC2954 IDDB-2 LTC2954 IDDB-2#TRLCNJ8-Lead (3mm 2mm) Plastic DFN 40 C to 85 CLTC2954 CTS8-1 LTC2954 CTS8-1#TRLTCJH8-Lead Plastic TSOT-230 C to 70 CLTC2954 CTS8-2 LTC2954 CTS8-2#TRLTCNK8-Lead Plastic TSOT-230 C to 70 CLTC2954 ITS8-1 LTC2954 ITS8-1#TRLTCJH8-Lead Plastic TSOT-23 40 C to 85 CLTC2954 ITS8-2 LTC2954 ITS8-2#TRLTCNK8-Lead Plastic TSOT-23 40 C to 85 CConsult LTC Marketing for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to: VIEWDDB PACKAGE8-LEAD (3mm s 2mm) PLASTIC DFN567894321 GNDONTPBVININTEN/ENPDTKILLTJMAX = 125 C, JA = 165 C/WEXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONALVIN 1PB 2 ONT 3 GND 48 KILL7 PDT6 EN/EN5 INTTOP VIEWTS8 PACKAGE8-LEAD PLASTIC TSOT-23 TJMAX = 125 C, JA = 140 C/WPIN CONFIGURATIONLTC295432954fb The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

6 VIN = to , unless otherwise noted. (Note 2)SYMBOLPARAMETERCONDITIONSMINTYPMAXUNIT SVINS upply Voltage RangeSteady State Supply CurrentSystem Power-On, VIN = to 24Vl612 AVUVLVIN Undervoltage LockoutVIN (HYST)VIN Undervoltage Lockout Hysteresis50400700mVPushbutton, Enable (PB, EN/EN))VPB(MIN, MAX)PB Voltage RangeSingle-Endedl Input < VPB < = 1 VVPB = 1 3 6 9 1 12 15 A A AVPB(VTH)PB Input ThresholdPB (VOC)PB Open Circuit VoltageIPB = 1 , LOCKOUTEN/EN Lockout Time (Note 5)Enable Released Enable Assertedl200256325msIEN(LKG)EN/EN Leakage CurrentVEN/ EN = 1V, Sink Current OffVEN/ EN = , Sink Current Offll 1 A AVEN(VOL)EN/EN Voltage Output LowIEN/ EN = 500 Timing Pin (ONT)IONT(PU)ONT Pull-Up CurrentVONT = 0Vl 3 AIONT(PD)ONT Pull-Down CurrentVONT = AtDB, ONInternal Turn-On Debounce TimeONT Pin Float, PB Falling Enable Assertedl263241mstONTA dditional Adjustable Turn-On Time CONT = Timing Pin (PDT)IPDT(PU)PDT Pull-Up CurrentVPDT = 0Vl 3 AIPDT(PD)PDT Pull-Down CurrentVPDT = AtDB, OFFTurn-Off Interrupt Debounce TimePB Falling INT Fallingl263241mstPD, MINI nternal PB Power-Down Debounce Time (Note 4)PDT Pin Float, PB Falling Enable Releasedl526482mstPDTA dditional Adjustable PB Power-Down Debounce TimeCPDT = ,MINM inimum INT Pulse WidthINT Asserted INT Releasedl263241mstINT, MAXM aximum INT Pulse WidthCPDT = 1500pF, INT Asserted INT P Handshake Pins (INT, KILL)IINT(LKG)INT Leakage CurrentVINT = 3Vl 1 AVINT(VOL)

7 INT Output Voltage LowIINT = (TH)KILL Input Threshold VoltageKILL (HYST)KILL Input Threshold Hysteresisl103050mVIKILL(LKG)KILL Leakage CurrentV KILL = At KILL(PW)KILL Minimum Pulse Widthl30 st KILL(PD)KILL Propagation DelayKILL Falling Enable Releasedl30 st KILL, ON BLANKKILL Turn-On Blanking (Note 3)KILL = Low, Enable Asserted Enable Releasedl400512650msELECTRICAL CHARACTERISTICSLTC295442954fbSupply Current vs TemperatureTurn-On Debounce Time (tDB, ON + tONT) vs ONT External CapacitanceSupply Current vs Supply VoltageONT Pull-Up Current vs TemperatureTurn-Off Debounce Time (tDB, OFF) vs VINI nternal Default Turn-On Debounce Time (tDB, ON) vs VINTYPICAL PERFORMANCE CHARACTERISTICSELECTRICAL CHARACTERISTICSNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

8 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 noted. Note 3: The KILL turn-on blanking timer period is the waiting period immediately after the enable output is asserted. This blanking time allows sufficient time for the DC/DC converter and the P to perform power-up tasks. The KILL and PB inputs are ignored during this period. If KILL remains low at the end of this time period, the enable output is released, thus turning off system power. This time delay does not include tDB,ON or tONT. Note 4: To manually force an immediate release of the EN/EN pin, the Pushbutton input must be held low for at least tPD,MIN (internal default power-down timer) + tPDT (adjustable by placing external capacitor at PDT pin).

9 Note 5: The enable lockout time is designed to allow an application to properly power-down such that the next power-up sequence starts from a consistent powered-down configuration. PB is ignored during this lockout time. This time delay does not include tDB,ON or tONT. 2954 G01 TEMPERATURE ( C) 50 IVIN ( A)1086420 250255075100 VIN = = = G0205101520253035 VIN (V)IVIN ( A)15129630T = 85 CT = 40 CT = 25 C2954 G03 VIN (V)00tDB, ON (ms)102030405051015202530TA = 25 C2954 G041tDB, ON + tONT (ms)10010001000101010010000TA = 25 CVIN = EXTERNAL CAPACITANCE (nF)2954 G05 TEMPERATURE ( C) 50 250255075100 ONT PULL-UP CURRENT ( A) = = G06 VIN (V)0tDB, OFF (ms)5 101520253050403020100TA = 25 CLTC295452954fbPB Power-Down Debounce Time (tPD,MIN + tPDT) vs PDT External CapacitancePDT Pull-Up Current vs TemperaturePB Current vs PB VoltagePB Voltage vs External PB Resistance to GroundEN/EN VOL vs Current LoadEN ( LTC2954 -2) Voltage vs VINEN ( LTC2954 -1)

10 Voltage vs VINI nternal Default PB Power-Down Debounce Time (tPD, MIN) vs VINTYPICAL PERFORMANCE CHARACTERISTICS2954 G07 VIN (V)051015202530tPD, MIN (ms)706040503020100TA = 25 C2954 G081tPD, MIN + tPDT (ms)10010001000101010010000TA = 25 CVIN = EXTERNAL CAPACITANCE (nF)2954 G09 TEMPERATURE ( C) 50 250255075100 PDT PULL-UP CURRENT ( A) = = G10PB CURRENT ( A) 100102030 551525 250 200 150 100 500PB VOLTAGE (V)TA = 25 CVIN = G1100501001502002503005101520 VIN = = 25 CPB VOLTAGE (mV)EXTERNAL PB RESISTANCE TO GROUND (k )TA = 45 CTA = 100 C2954 G13 VIN (V)0EN (V)4123TA = 25 C100k PULL-UP FROM EN TO G14EN (V)VIN (V)0412343210TA = 25 C100k PULL-UP FROM EN TO VIN2954 G12EN/EN CURRENT LOAD (mA) VOLTAGE (mV) = 25 CVIN = (Pin 1/Pin 4): Power Supply Input: to (Pin 2/Pin 3): Pushbutton Input.