On/Off Controller. LTC2953 Datasheet

LTC2953 Controller. Datasheet pdf. Equivalent

Part LTC2953
Description Push Button On/Off Controller
Feature www.DataSheet4U.com FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LTC2953 Push Button On/Off Controller with .
Manufacture Linear Technology
Datasheet
Download LTC2953 Datasheet




LTC2953
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FEATURES
Wide Operating Voltage Range: 2.7V to 27V
Push Button Control of System Power
Low Supply Current: 14μA
Power Fail Comparator Generates Warning
UVLO Comparator Gracefully Latches Power Off
Adjustable Supply Monitor with 200ms Reset
Adjustable Power Down Timer
Low Leakage EN Output (LTC2953-1) Allows DC/DC
Converter Control
High Voltage EN Output (LTC2953-2) Allows Circuit
Breaker Control
Simple Interface Allows Orderly System Power Up
and Power Down
±1.5% Threshold Tolerances
±10kV ESD HBM on PB Input
12-Pin 3mm × 3mm DFN
APPLICATIONS
Push Button Power Path Control
Battery Power Supervisor
Portable Instrumentation, PDA
Blade Servers
Desktop and Notebook Computers
LTC2953
Push Button
On/Off Controller
with Voltage Monitoring
DESCRIPTION
The LTC®2953 is a push button On/Off controller that
manages system power via a push button interface. An
enable output toggles system power while an interrupt
output provides debounced push button status. The inter-
rupt output can be used in menu driven applications to
request a system power down.
The LTC2953 also features input and output power sup-
ply monitors. An uncommitted power fail comparator
provides real time input monitor information, while a
de-glitched under voltage lockout comparator gracefully
initiates a system power down. The under voltage lockout
comparator prevents the system from powering from a
low power supply.
The adjustable supply monitor input is compared against
an accurate internal 0.5V reference. The reset output
remains low until the supply monitor input has been in
compliance for 200ms.
The LTC2953 operates over a wide 2.7V to 27V input
voltage range and draws only 14μA of current. Two ver-
sions of the part accommodate either positive or negative
enable polarities.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
+
8.4V 2150k
UVLO
VIN
EN
100k
VIN VOUT
DC/DC
SHDN
3.3V
23.2k
196k
ON/OFF
LTC2953-1
PFI VM
499k 100k
100k
100k
100k
RST
PFO
INT
PB KILL
RST
GPIO
INT SYSTEM
KILL LOGIC
GND PDT
1μF
2953 TA01
tPDT = 6.4 SECONDS
Push Button On/Off Control with Interrupt
TURN ON PULSE
SHORT
INTERRUPT PULSE
PB
LONG
TURN OFF PULSE
EN
TURNS ON
STAYS ON
TURNS OFF
INT
INTERRUPT
INTERRUPT
2954 TD01b
2953f
1



LTC2953
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LTC2953
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (VIN) .................................. –0.3V to 33V
Input Voltages
PB, PFI, UVLO........................................... –6V to 33V
VM ......................................................... –0.3V to 20V
KILL ....................................................... –0.3V to 10V
PDT....................................................... –0.3V to 2.7V
Output Voltages
EN/EN, PFO............................................ –0.3V to 50V
RST, INT ................................................ –0.3V to 10V
Operating Temperature Range
LTC2953C ................................................ 0°C to 70°C
LTC2953I ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
GND 1
VM 2
KILL 3
PDT 4
PB 5
VIN 6
12 INT
11 EN/EN
10 RST
13
9 PFO
8 PFI
7 UVLO
DD PACKAGE
12-LEAD (3mm ´ 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) PCB GROUND CONNECTION OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2953CDD-1#PBF
LTC2953CDD-2#PBF
LTC2953IDD-1#PBF
LTC2953IDD-2#PBF
LTC2953CDD-1#TRPBF
LTC2953CDD-2#TRPBF
LTC2953IDD-1#TRPBF
LTC2953IDD-2#TRPBF
LCWT
LCQT
LCWT
LCQT
12-Lead (3mm × 3mm) Plastic DFN
12-Lead (3mm × 3mm) Plastic DFN
12-Lead (3mm × 3mm) Plastic DFN
12-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 2.7V to 27V, unless otherwise noted (Note 2).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Supply Pin (VIN)
VIN Supply Voltage Range
Steady State Operation
2.7
27 V
IIN VIN Supply Current
VUVL VIN Undervoltage Lockout
Push Button, Enable (PB, EN/EN)
VIN = 2.7V to 27V
VIN Falling
14 26
2.2 2.3 2.5
μA
V
VPB(MIN, MAX)
IPB
PB Operating Voltage Range
PB Input Current
VPB(VTH)
VPB(VOC)
PB Input Threshold
PB Open Circuit Voltage
Single-Ended
2.5V < VPB < 27V
VPB = 1V
VPB = 0.6V
PB Falling
IPB = –1μA
–1
27
–1
–3
±1
–6 –12
–9 –15
0.6
0.8
1
1 1.6 2
V
μA
μA
μA
V
V
2953f
2







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