LTC2951IDDB-1#TRPBF Linear Technology, LTC2951IDDB-1#TRPBF Datasheet
LTC2951IDDB-1#TRPBF
Specifications of LTC2951IDDB-1#TRPBF
Available stocks
Related parts for LTC2951IDDB-1#TRPBF
LTC2951IDDB-1#TRPBF Summary of contents
Page 1
... The parts are available in 8-pin 3mm × 2mm DFN and ThinSOT packages. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...
Page 2
... JMAX JA EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC2951CDDB-1#PBF LTC2951CDDB-1#TRPBF LTC2951CDDB-2#PBF LTC2951CDDB-2#TRPBF LTC2951IDDB-1#PBF LTC2951IDDB-1#TRPBF LTC2951IDDB-2#PBF LTC2951IDDB-2#TRPBF LTC2951CTS8-1#PBF LTC2951CTS8-1#TRPBF LTC2951CTS8-2#PBF LTC2951CTS8-2#TRPBF LTC2951ITS8-1#PBF LTC2951ITS8-1#TRPBF LTC2951ITS8-2#PBF LTC2951ITS8-2#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. ...
Page 3
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V Supply Voltage Range Supply Current Undervoltage Lockout UVL Undervoltage Lockout Hysteresis UVL(HYST) IN Pushbutton, Enable (PB, EN/ EN) ...
Page 4
LTC2951-1/LTC2951-2 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Temperature 26 –50 – TEMPERATURE (°C) 2951 G01 Internal Default Turn-Off Debounce ...
Page 5
TYPICAL PERFORMANCE CHARACTERISTICS PB Current vs PB Voltage –250 –200 –150 –100 –50 0 –10 – VOLTAGE (V) EN/ Current Load OL 500 T = 25° 3.3V IN 400 300 200 100 ...
Page 6
LTC2951-1/LTC2951-2 PIN FUNCTIONS (TSOT-23/DFN) V (Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V (Pin 2/Pin 3): Pushbutton Input. Connecting PB to ground through a momentary switch provides on/off control via the EN/EN pin. An internal 100k pull-up ...
Page 7
BLOCK DIAGRAM V IN 2.7V TO 26.4V REGULATOR 2.4V 100k PB 10µs FILTER 0.8V GND 2.4V OSCILLATOR DEBOUNCE OSCILLATOR KILLT LTC2951-1/LTC2951-2 EN/EN KILL LOGIC 0.6V INT 2951 BD OFFT 295112fb 7 ...
Page 8
LTC2951-1/LTC2951-2 TIMING DIAGRAMS PB EN (LTC2951-1) EN (LTC2951- KILL(PW) KILL t KILL(PD) EN/EN PB & KILL IGNORED t t KILL , ON BLANK DB, ON Power-On Timing 2951 TD01 2951 TD02 295112fb ...
Page 9
TIMING DIAGRAMS PB OFFT INT KILLT EN (LTC2951-1) EN (LTC2951-2) LTC2951-1/LTC2951-2 PB IGNORED t t DB, OFF OFFT 16 CYCLES t KILL, OFF DELAY Power-Off Timing, KILL > 0.6V t KILL, OFF DELAY, ADDITIONAL 16 CYCLES 2951 TD03 295112fb 9 ...
Page 10
LTC2951-1/LTC2951-2 APPLICATIONS INFORMATION Description The LTC2951 is a low power (6µA), wide input voltage range (2.7V to 26.4V), pushbutton On/Off controller that can in- terface to a µP and a power supply. The part incorporates all the flexible timing needed ...
Page 11
APPLICATIONS INFORMATION Simplified Power-On/-Off Sequence Figure 1 shows a simplified LTC2951-1 power-on and power-off sequence. A high to low transition initiates the power-on sequence. This diagram does not show any bounce order to ...
Page 12
LTC2951-1/LTC2951-2 APPLICATIONS INFORMATION and the external OFFT capacitor (t – the OFFT timing ( interrupt (INT) is set, signify- 6 ing that EN will be switched low after the KILL turn-off ( ...
Page 13
APPLICATIONS INFORMATION DC/DC Turn-Off Blanking When the DC/DC converter is turned off, it can take a sig- nificant amount of time for its output to decay to ground desirable to wait until the output of the DC/DC converter ...
Page 14
LTC2951-1/LTC2951-2 TYPICAL APPLICATIONS Voltage Monitoring with KILL Input The KILL pin can be used as a voltage monitor. Figure 5 shows an application where the KILL pin has a dual function driven by a low leakage open-drain output ...
Page 15
TYPICAL APPLICATIONS PowerPath Switching TM The EN open-drain output of the LTC2951-2 is designed to switch on/off an external power PFET. This allows a user to connect/disconnect a power supply (or battery) to its load by toggling the PB pin. ...
Page 16
LTC2951-1/LTC2951-2 TYPICAL APPLICATIONS External Pull-Up Resistor internal pull-up resistor on the PB pin makes an ex- ternal pull-up resistor unnecessary. Leakage current on the PB board trace, however, will affect the open circuit voltage on the PB ...
Page 17
PACKAGE DESCRIPTION 0.61 ±0.05 (2 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.20 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE ...
Page 18
LTC2951-1/LTC2951-2 PACKAGE DESCRIPTION 0.40 MAX 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.20 BSC DATUM ‘A’ 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF ...
Page 19
... Updated Figure 8 Updated Related Parts 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC2951-1/LTC2951-2 ...
Page 20
... No External MOSFET, Automatic Switching Between DC Sources Efficient 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 2951 F10 295112fb LT 0111 REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORA TION 2005 ...