LTC2954ITS8-2#TRMPBF Linear Technology, LTC2954ITS8-2#TRMPBF Datasheet

IC PB ON/OFF CONTROLLER TSOT23-8

LTC2954ITS8-2#TRMPBF

Manufacturer Part Number
LTC2954ITS8-2#TRMPBF
Description
IC PB ON/OFF CONTROLLER TSOT23-8
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2954ITS8-2#TRMPBF

Applications
Push Button, On/Off Controller
Voltage - Supply
2.7 V ~ 26.4 V
Current - Supply
6µA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-8, TSOT-8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Input
-
Other names
LTC2954ITS8-2#TRMPBFTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC2954ITS8-2#TRMPBFLTC2954ITS8-2
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC2954ITS8-2#TRMPBFLTC2954ITS8-2#TRPBF
0
FEATURES
n
n
n
n
n
n
n
n
n
n
APPLICATIONS
n
n
n
n
n
TYPICAL APPLICATION
+
Adjustable Power On/Off Timers
Low Supply Current: 6μA
Wide Operating Voltage Range: 2.7V to 26.4V
Low Leakage EN Output (LTC2954-1) Allows DC/DC
Converter Control
High Voltage EN Output (LTC2954-2) Allows Circuit
Breaker Control
Simple Interface Allows Graceful μP Shutdown
High Input Voltage PB Pin with Internal Pull-Up
Resistor
±10kV ESD HBM on PB Input
Accurate 0.6V Threshold on KILL Comparator Input
8-Pin 3mm × 2mm DFN and ThinSOT™ Packages
Pushbutton PowerPath™ Control
Portable Instrumentation Meters
Blade Servers
Portable Customer Service PDA
Desktop and Notebook Computers
9V
V
GND
PB
IN
ONT
LTC2954-2
100k
KILL
PDT
INT
EN
1μF
t
PDT
100k
= 6.4 SECONDS
V
IN
10k
DC/DC
V
INT
KILL
OUT
μP/μC
2954 TA01a
Controller with µP Interrupt
DESCRIPTION
The LTC
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 power.
The LTC2954 operates over a wide 2.7V to 26.4V input volt-
age range to accommodate a wide variety of input power
supplies. Very low quiescent current (6μA typical) makes
the LTC2954 ideally suited for battery powered applications.
Two versions of the part are available to accommodate
either positive or negative enable polarities.
L, 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.
INT
PB
EN
TURN-ON PULSE
®
2954 is a pushbutton on/off controller that
TURNS ON
Pushbutton On/Off with Interrupt
Pushbutton On/Off
SHORT PULSE
INTERRUPT
STAYS ON
LTC2954
TURNS OFF
LONG PULSE
INTERRUPT
2954 TA01b
2954fb
1

Related parts for LTC2954ITS8-2#TRMPBF

LTC2954ITS8-2#TRMPBF Summary of contents

Page 1

... Two versions of the part are available to accommodate either positive or negative enable polarities. L, 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. ...

Page 2

... LTC2954CTS8-1 LTC2954CTS8-1#TR LTC2954CTS8-2 LTC2954CTS8-2#TR LTC2954ITS8-1 LTC2954ITS8-1#TR LTC2954ITS8-2 LTC2954ITS8-2#TR Consult LTC Marketing for parts specified with wider operating temperature ranges. *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: ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V Supply Voltage Range Supply Current Undervoltage Lockout UVL Undervoltage Lockout UVL(HYST) IN Hysteresis Pushbutton, Enable (PB, EN/EN)) PB ...

Page 4

LTC2954 ELECTRICAL CHARACTERISTICS 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 lifetime. Note 2: All currents ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Internal Default PB Power-Down Debounce Time ( PD,MIN 25° (V) IN 2954 G07 PB Current ...

Page 6

LTC2954 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 and INT outputs. An internal ...

Page 7

BLOCK DIAGRAM V 1.5k IN 2.7V TO 26.4V 2.4V 100k PB 0.8V GND TIMING DIAGRAMS REGULATOR 2.4V 29V ZENER OSCILLATOR 10μS DEBOUNCE FILTER OSCILLATOR ONT t KILL(PW) KILL t KILL(PD) EN/EN LTC2954 EN (–1) EN (–2) HIGH VOLTAGE KILL LOGIC ...

Page 8

LTC2954 TIMING DIAGRAMS PB ONT EN (LTC2954-1) PB PDT INT Off Interrupt Timing, PB Pressed and Released, Enable Remains Active PB PDT INT EN (LTC2954-1) Forced Off, Power-Down Timing, PB Pressed and Held Low for t > ...

Page 9

APPLICATIONS INFORMATION Description The LTC2954 is a pushbutton on/off controller that provides control of 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 ...

Page 10

LTC2954 APPLICATIONS INFORMATION DB, ON ONT t ONT PDT INT KILL XXX DON'T CARE EN Figure 1. Simplified Power On/Off Sequence for LTC2954-1. μP Asserts KILL After an Interrupt POWER-ON TIMING KILL Figure 2. KILL Remaining ...

Page 11

APPLICATIONS INFORMATION low 512ms after it went high. Note that the LTC2954 does not sample KILL and PB until after the 512ms internal timer has expired. The reason PB is ignored is to ensure that the system is not forced ...

Page 12

LTC2954 APPLICATIONS INFORMATION LTC2954-1, LTC2954-2 Versions The LTC2954-1 (high true EN) and LTC2954-2 (low true EN) differ only by the polarity of the high voltage (33V ABS MAX), enable pin. The LTC2954-1 EN pin is a low leakage high true ...

Page 13

TYPICAL APPLICATIONS width detected is 30μs. If there are glitches on the resis- tor 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. The optional C ...

Page 14

LTC2954 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 15

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 16

LTC2954 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 17

... Revised notes for Figures 5 and 6 in Typical Applications 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. ...

Page 18

... Wide Input Range: 1.2V to 18V Automatic Low Loss Switchover Between DC Sources High Voltage Pushbutton Controller with 200ms Voltage Reset Monitor ● www.linear.com V OUT 1.8V R1 10k INT μP KILL 2954 TA02 LT 0211 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORA TION 2006 2954fb ...

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