LTC2954 Pushbutton On/Off Controller with µP Interrupt ...

1 LTC2954 . Pushbutton On/Off Controller with P Interrupt FEATURES DESCRIPTION. n Adjustable Power On/Off Timers The LTC 2954 is a Pushbutton On/Off Controller that n Low Supply Current: 6 A manages system power via a Pushbutton interface. An n Wide Operating Voltage Range: to enable output toggles system power while an Interrupt n Low Leakage EN Output ( LTC2954 -1) Allows DC/DC output provides debounced Pushbutton status. The inter - Converter Control rupt output can be used in menu driven applications to n High Voltage EN Output ( LTC2954 -2) Allows Circuit request a system power-down.

2 A power kill input allows Breaker Control a microprocessor or system to reset the enable output, n Simple Interface Allows Graceful P Shutdown effectively powering down the system. Independently n High Input Voltage PB Pin with Internal Pull-Up adjustable on and off timers allow dependable Pushbutton Resistor control of the enable output and resistance to accidental n 10kV ESD HBM on PB Input toggling of system power. n Accurate Threshold on KILL Comparator Input n The LTC2954 operates over a wide to input volt- 8-Pin 3mm 2mm DFN and ThinSOT Packages age range to accommodate a wide variety of input power supplies.

3 Very low quiescent current (6 A typical) makes APPLICATIONS the LTC2954 ideally suited for battery powered applications. n Two versions of the part are available to accommodate Pushbutton PowerPath Control n either positive or negative enable polarities. Portable Instrumentation Meters L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Blade Servers PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks n are the property of their respective owners.

4 Portable Customer Service PDA. n Desktop and Notebook Computers TYPICAL APPLICATION. Pushbutton On/Off with Interrupt VIN VOUT. TURN-ON PULSE SHORT PULSE LONG PULSE. DC/DC. + PB. 100k 100k 9V. EN TURNS ON STAYS ON TURNS OFF. VIN EN 10k LTC2954 -2 INT INT INT. P/ C. Interrupt Interrupt . PB KILL KILL. 2954 TA01b GND ONT PDT. 2954 TA01a 1 F. tPDT = SECONDS. 2954fb 1. LTC2954 . ABSOLUTE MAXIMUM RATINGS (Note 1). Supply Voltage (VIN) .. to 33V Operating Temperature Range Input Voltages LTC2954C-1 .. 0 C to 70 C. PB.

5 6V to 33V LTC2954C-2 .. 0 C to 70 C. ONT .. to LTC2954I-1 .. 40 C to 85 C. PDT .. to LTC2954I-2 .. 40 C to 85 C. KILL .. to 7V Storage Temperature Range Output Voltages DFN Package .. 65 C to 125 C. INT .. to 10V TSOT-23 .. 65 C to 150 C. EN/EN .. to 33V Lead Temperature (Soldering, 10 sec).. 300 C. PIN CONFIGURATION. TOP VIEW. TOP VIEW. GND 1 8 INT. VIN 1 8 KILL. ONT 2 7 EN/EN. 9 PB 2 7 PDT. PB 3 6 PDT ONT 3 6 EN/EN. VIN 4 5 KILL GND 4 5 INT. TS8 PACKAGE. DDB PACKAGE 8-LEAD PLASTIC TSOT-23. 8-LEAD (3mm s 2mm) PLASTIC DFN TJMAX = 125 C, JA = 140 C/W.

6 TJMAX = 125 C, JA = 165 C/W. EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL. ORDER INFORMATION. LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE. LTC2954 CDDB-1#PBF LTC2954 CDDB-1#TRPBF LCJG 8-Lead (3mm 2mm) Plastic DFN 0 C to 70 C. LTC2954 CDDB-2#PBF LTC2954 CDDB-2#TRPBF LCNJ 8-Lead (3mm 2mm) Plastic DFN 0 C to 70 C. LTC2954 IDDB-1#PBF LTC2954 IDDB-1#TRPBF LCJG 8-Lead (3mm 2mm) Plastic DFN 40 C to 85 C. LTC2954 IDDB-2#PBF LTC2954 IDDB-2#TRPBF LCNJ 8-Lead (3mm 2mm) Plastic DFN 40 C to 85 C.

7 LTC2954 CTS8-1#PBF LTC2954 CTS8-1#TRPBF LTCJH 8-Lead Plastic TSOT-23 0 C to 70 C. LTC2954 CTS8-2#PBF LTC2954 CTS8-2#TRPBF LTCNK 8-Lead Plastic TSOT-23 0 C to 70 C. LTC2954 ITS8-1#PBF LTC2954 ITS8-1#TRPBF LTCJH 8-Lead Plastic TSOT-23 40 C to 85 C. LTC2954 ITS8-2#PBF LTC2954 ITS8-2#TRPBF LTCNK 8-Lead Plastic TSOT-23 40 C to 85 C. LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE. LTC2954 CDDB-1 LTC2954 CDDB-1#TR LCJG 8-Lead (3mm 2mm) Plastic DFN 0 C to 70 C. LTC2954 CDDB-2 LTC2954 CDDB-2#TR LCNJ 8-Lead (3mm 2mm) Plastic DFN 0 C to 70 C.

8 LTC2954 IDDB-1 LTC2954 IDDB-1#TR LCJG 8-Lead (3mm 2mm) Plastic DFN 40 C to 85 C. LTC2954 IDDB-2 LTC2954 IDDB-2#TR LCNJ 8-Lead (3mm 2mm) Plastic DFN 40 C to 85 C. LTC2954 CTS8-1 LTC2954 CTS8-1#TR LTCJH 8-Lead Plastic TSOT-23 0 C to 70 C. LTC2954 CTS8-2 LTC2954 CTS8-2#TR LTCNK 8-Lead Plastic TSOT-23 0 C to 70 C. LTC2954 ITS8-1 LTC2954 ITS8-1#TR LTCJH 8-Lead Plastic TSOT-23 40 C to 85 C. LTC2954 ITS8-2 LTC2954 ITS8-2#TR LTCNK 8-Lead Plastic TSOT-23 40 C to 85 C. Consult LTC Marketing for parts specified with wider operating temperature ranges.

9 *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifications, go to: 2954fb 2. LTC2954 . ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VIN = to , unless otherwise noted. (Note 2). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VIN Supply Voltage Range Steady State Operation l V.

10 IIN VIN Supply Current System Power-On, VIN = to 24V l 6 12 A. VUVL VIN Undervoltage Lockout VIN Falling l V. VUVL(HYST) VIN Undervoltage Lockout 50 400 700 mV. Hysteresis Pushbutton , Enable (PB, EN/EN)). VPB(MIN, MAX) PB Voltage Range Single-Ended l 1 V. IPB PB Input Current < VPB < l 1 A. VPB = 1V l 1 6 12 A. VPB = l 3 9 15 A. VPB(VTH) PB Input Threshold PB Falling l 1 V. VPB(VOC) PB Open Circuit Voltage IPB = 1 A 1 2 V. t EN, LOCKOUT EN/EN Lockout Time (Note 5) Enable Released Enable Asserted l 200 256 325 ms IEN(LKG) EN/EN Leakage Current VEN/ EN = 1V, Sink Current Off l A.