LTC2950ITS8-2#PBF Linear Technology, LTC2950ITS8-2#PBF Datasheet

Page 1

... The parts are available in either 8-lead 3mm × 2mm DFN or ThinSOT packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners ...

Page 2

... LTC2950CTS8-2#TRPBF LTC2950ITS8-1#TRMPBF LTC2950ITS8-1#TRPBF LTC2950ITS8-2#TRMPBF LTC2950ITS8-2#TRPBF TRM = 500 pieces. *Temperature grades are identifi label on the shipping container. Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Supply Voltage Range Supply Current Undervoltage Lockout UVL Undervoltage Lockout UVL(HYST) IN Hysteresis Push Button Pin (PB) ...

Page 4

LTC2950-1/LTC2950-2 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Temperature 26 – –25 TEMPERATURE (°C) 2950 G01 Turn On Debounce Time ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS PB Voltage vs External PB Resistance to Ground 300 V = 3.3V IN 250 200 T A 150 100 EXTERNAL PB RESISTANCE TO GROUND (kΩ) EN (LTC2950-1) Voltage vs V 1.0 T ...

Page 6

LTC2950-1/LTC2950-2 PIN FUNCTIONS (TSOT-23/DFN) V (Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V (Pin 2/Pin 3): Push Button Input. Connecting PB to ground through a momentary switch provides on/off control via the EN/EN pin. An internal 100k ...

Page 7

BLOCK DIAGRAM V IN REGULATOR 2.7V TO 26.4V 2.4V 100k PB 0.8V GND TIMING DIAGRAMS 2.4V OSCILLATOR LOGIC DEBOUNCE OSCILLATOR ONT t KILL(PW) KILL t KILL(PD) EN/EN LTC2950-1/LTC2950-2 0.6V 2950 BD OFFT 2950 TD01 EN/EN KILL INT 295012fc 7 ...

Page 8

LTC2950-1/LTC2950-2 TIMING DIAGRAMS (LTC2950-1) (LTC2950-2) OFFT (LTC2950-1) (LTC2950- & KILL IGNORED DB, ON ONT KILL, ON BLANK 16 CYCLES EN EN Power On Timing PB PB IGNORED t t DB, OFF OFFT 16 CYCLES ...

Page 9

APPLICATIONS INFORMATION Description The LTC2950 is a low power (6μA), wide input voltage range (2.7V to 26.4V), push button on/off controller that can interface to a μP and a power supply. The turn-on and turn-off debounce times are extendable using ...

Page 10

LTC2950-1/LTC2950-2 APPLICATIONS INFORMATION DB, ON ONT ONT OFFT INT KILL EN Figure 1. Simplifi ed Power On/Off Sequence for LTC2950-1 POWER & KILL IGNORED ...

Page 11

APPLICATIONS INFORMATION Aborted Power On Sequence The power on sequence is aborted when the KILL remains low after the end of the 512ms blanking time. Figure simplifi ed version of an aborted power on sequence. since KILL ...

Page 12

LTC2950-1/LTC2950-2 APPLICATIONS INFORMATION The following equations describe the turn on and turn off times. C and C are the external programming ONT OFFT capacitors 32ms + 1ms + (6.7x10 BD,ON ONT 32ms ...

Page 13

TYPICAL APPLICATIONS pull-up voltage that are wider than 30μs and transition below 0.6V, then an appropriate bypass capacitor should be connected to the KILL pin. Power Path Switching The EN open drain output of the LTC2950-2 is designed to switch ...

Page 14

LTC2950-1/LTC2950-2 TYPICAL APPLICATIONS the PB board trace, however, will affect the open circuit voltage on the PB pin. If the leakage is too large (>2μA), the PB voltage may fall close to the threshold window. To mitigate the effect of ...

Page 15

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. TS8 Package ...

Page 16

... No External MOSFET, Automatic Switching Between DC Sources Effi cient Diode-ORing, Automatic Switching Between DC Sources 36V Automatic Switchover, Charges 1-Cell Li-Ion Batteries www.linear.com ● V OUT 1.8V R1 10k INT μP KILL 2950 F10 LT 0209 REV C • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2008 295012fc ...