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.
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
⎯
E
⎯
N 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
⎯
P
⎯
B Input
12-Pin 3mm
×
3mm DFN
APPLICATIONS
■
■
■
■
■
Push Button Power Path Control
Battery Power Supervisor
Portable Instrumentation, PDA
Blade Servers
Desktop and Notebook Computers
TYPICAL APPLICATION
V
IN
V
OUT
DC/DC
SHDN
100k
100k
100k
100k
RST
PFO
INT
KILL
PDT
1μF
t
PDT
= 6.4 SECONDS
2953f
2953 TA01
Push Button On/Off Control with Interrupt
3.3V
TURN ON PULSE
PB
SHORT
INTERRUPT PULSE
LONG
TURN OFF PULSE
+
8.4V
2150k
UVLO
V
IN
EN
100k
23.2k
PFI
196k
LTC2953-1
VM
499k
EN
TURNS ON
STAYS ON
TURNS OFF
PB
ON/OFF
GND
RST
GPIO
INT SYSTEM
LOGIC
KILL
INT
INTERRUPT
INTERRUPT
2954 TD01b
1
LTC2953
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
GND
V
M
KILL
PDT
PB
V
IN
1
2
3
4
5
6
13
12 INT
11 EN/EN
10 RST
9 PFO
8 PFI
7 UVLO
Supply Voltage (V
IN
) .................................. –0.3V to 33V
Input Voltages
⎯
P
⎯
B,
⎯
P
⎯
F
⎯
I, UVLO........................................... –6V to 33V
VM ......................................................... –0.3V to 20V
⎯
K
⎯
I
⎯
L
⎯
L ....................................................... –0.3V to 10V
PDT....................................................... –0.3V to 2.7V
Output Voltages
EN/
⎯
E
⎯
N,
⎯
P
⎯
F
⎯
O ............................................ –0.3V to 50V
⎯
R
⎯
S
⎯
T,
⎯
I
⎯
N
⎯
T ................................................ –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
DD PACKAGE
12-LEAD (3mm
´
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) PCB GROUND CONNECTION OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH
LTC2953CDD-1#PBF
LTC2953CDD-2#PBF
LTC2953IDD-1#PBF
LTC2953IDD-2#PBF
TAPE AND REEL
LTC2953CDD-1#TRPBF
LTC2953CDD-2#TRPBF
LTC2953IDD-1#TRPBF
LTC2953IDD-2#TRPBF
PART MARKING*
LCWT
LCQT
LCWT
LCQT
PACKAGE DESCRIPTION
12-Lead (3mm
×
3mm) Plastic DFN
12-Lead (3mm
×
3mm) Plastic DFN
12-Lead (3mm
×
3mm) Plastic DFN
12-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
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
SYMBOL
Supply Pin (V
IN
)
V
IN
I
IN
V
UVL
V
PB(MIN, MAX)
I
PB
Supply Voltage Range
V
IN
Supply Current
V
IN
Undervoltage Lockout
⎯
P
⎯
B Operating Voltage Range
⎯
P
⎯
B Input Current
PARAMETER
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.7V to 27V, unless otherwise noted (Note 2).
CONDITIONS
Steady State Operation
V
IN
= 2.7V to 27V
V
IN
Falling
Single-Ended
2.5V < V
PB
< 27V
V
PB
= 1V
V
PB
= 0.6V
⎯
P
⎯
B Falling
I
PB
= –1μA
●
●
●
MIN
2.7
TYP
MAX
27
UNITS
V
μA
V
V
μA
μA
μA
V
V
14
2.2
–1
–1
–3
0.6
1
–6
–9
0.8
1.6
2.3
26
2.5
27
±1
–12
–15
1
2
Push Button, Enable (
⎯
P
⎯
B, EN/
⎯
E
⎯
N)
●
●
●
●
●
●
V
PB(VTH)
V
PB(VOC)
⎯
P
⎯
B Input Threshold
⎯
P
⎯
B Open Circuit Voltage
2953f
2
LTC2953
ELECTRICAL CHARACTERISTICS
SYMBOL
I
EN(LKG)
V
EN(VOL)
t
EN, Lock Out
t
DB, ON
I
PDT(PU)
I
PDT(PD)
t
DB, OFF
t
PD, Min
t
PDT
t
INT
,
Min
t
INT, Max
V
KILL(TH)
V
KILL(HYST)
t
KILL(PW)
t
KILL(PD)
t
KILL, ON BLANK
I
KILL(LKG)
I
INT(LKG)
V
INT(VOL)
V
PFI(TH)
V
UVLO(TH)
VM
(TH)
ΔV
TH
V
PFI(HYST)
V
UVLO(HYST)
V
PFO(VOL)
V
RST(VOL)
PARAMETER
EN/
⎯
E
⎯
N Leakage Current
EN/
⎯
E
⎯
N Voltage Output Low
EN/
⎯
E
⎯
N Lock Out Time (Note 3)
Turn On Debounce Time
PDT Pull Up Current
PDT Pull Down Current
Turn Off Interrupt Debounce Time
Internal
⎯
P
⎯
B Power Down Delay
Time (Note 4)
Additional Adjustable
⎯
P
⎯
B Power
Down Delay Time
Minimum
⎯
I
⎯
N
⎯
T Pulse Width
Maximum
⎯
I
⎯
N
⎯
T Pulse Width
⎯
K
⎯
I
⎯
L
⎯
L Input Threshold Voltage
⎯
K
⎯
I
⎯
L
⎯
L Input Threshold Hysteresis
⎯
K
⎯
I
⎯
L
⎯
L Minimum Pulse Width
⎯
K
⎯
I
⎯
L
⎯
L Propagation Delay
⎯
K
⎯
I
⎯
L
⎯
L Turn On Blanking (Note 5)
⎯
K
⎯
I
⎯
L
⎯
L Leakage Current
⎯
I
⎯
N
⎯
T Leakage Current
⎯
I
⎯
N
⎯
T Output Voltage Low
⎯
P
⎯
F
⎯
I Input Threshold Voltage
UVLO Input Threshold Voltage
Adjustable Reset Threshold
⎯
P
⎯
F
⎯
I-UVLO Threshold Mismatch
⎯
P
⎯
F
⎯
I Input Hysteresis
UVLO Input Hysteresis
⎯
P
⎯
F
⎯
O Output Voltage Low
⎯
R
⎯
S
⎯
T Output Voltage Low
I
PFO
= 500μA
I = 3mA
⎯
K
⎯
I
⎯
L
⎯
L Falling
→
Enable Released
⎯
K
⎯
I
⎯
L
⎯
L = Low, Enable Asserted
→
Enable Released
V
KILL
= 0.6V
V
INT
= 3V
I
INT
= 3mA
Falling
Falling
Falling/Rising
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.7V to 27V, unless otherwise noted (Note 2).
CONDITIONS
V
EN/
⎯
E
⎯
N
= 1V, Sink Current Off
V
EN/
⎯
E
⎯
N
= 40V, Sink Current Off
I
EN/
⎯
E
⎯
N
= 500μA
Enable Released
→
Enable Asserted
⎯
P
⎯
B Falling
→
Enable Asserted
V
PDT
= 0V
V
PDT
= 1.3V
⎯
P
⎯
B, UVLO Falling
→ ⎯
I
⎯
N
⎯
T Falling
⎯
P
⎯
B, UVLO Falling
→
Enable Released
PDT Open
C
PDT
= 1500pF
⎯
I
⎯
N
⎯
T Asserted
→ ⎯
I
⎯
N
⎯
T Released
C
PDT
= 1500pF,
⎯
I
⎯
N
⎯
T Asserted
→ ⎯
I
⎯
N
⎯
T Released
⎯
K
⎯
I
⎯
L
⎯
L Falling
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
MAX
±0.1
±1
UNITS
μA
μA
V
ms
ms
μA
μA
ms
ms
ms
ms
ms
V
mV
μs
μs
ms
μA
μA
V
mV
mV
mV
mV
mV
mV
V
V
0.11
52
26
–2.4
2.4
26
52
9
26
35
0.57
10
30
64
32
–3
3
32
64
11.5
32
43.5
0.6
30
0.4
82
41
–3.6
3.6
41
82
13.5
41
54.5
0.63
50
30
On/Off Timing Pins (
⎯
P
⎯
B, UVLO, PDT,
⎯
I
⎯
N
⎯
T)
μP Handshake Pins (
⎯
K
⎯
I
⎯
L
⎯
L,
⎯
I
⎯
N
⎯
T)
400
512
650
±0.1
±0.1
0.11
492
492
492
–5
2
30
500
500
500
0
4
50
0.11
0.11
0.4
508
508
508
5
10
70
0.4
0.4
Power Fail and Voltage Monitor Pins (
⎯
P
⎯
F
⎯
I,
⎯
P
⎯
F
⎯
O, UVLO, VM,
⎯
R
⎯
S
⎯
T)
2953f
3
LTC2953
ELECTRICAL CHARACTERISTICS
SYMBOL
I
PFI(LKG)
I
PFO(LKG)
I
UVLO(LKG)
I
VM(LKG)
I
RST(LKG)
t
PFI
t
RST
t
uv
PARAMETER
⎯
P
⎯
F
⎯
I Leakage Current
⎯
P
⎯
FO Leakage Current
UVLO Leakage Current
VM Input Leakage Current
⎯
R
⎯
S
⎯
T Output Leakage Current
⎯
P
⎯
F
⎯
I Delay to
⎯
P
⎯
F
⎯
O
Reset Timeout Period
VM Under Voltage Detect to
⎯
R
⎯
S
⎯
T
VM Less Than VM
(TH)
By More Than 1%
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.7V to 27V, unless otherwise noted (Note 2).
CONDITIONS
V
PFI
= 0.5V
V
PFI
= 27V
V
PFO
= 1V
V
PFO
= 40V
V
UVLO
= 0.5V
V
UVLO
= 27V
VM = 0.5V
V
RST
= 3V
●
●
●
●
●
●
●
MIN
TYP
2
2
2
2
MAX
±10
±1
±10
±1
±10
±1
±10
±0.1
200
260
UNITS
nA
μA
nA
μA
nA
μA
nA
μA
μs
ms
μs
40
140
100
200
250
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 into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3:
The Enable Lock Out time is designed to allow an application to
properly power down such that the next power up sequence starts from a
consistent powered down configuration.
⎯
P
⎯
B is ignored during this lock out
time. This time delay does not include t
DB, ON
.
Note 4:
To manually force a release of the EN/
⎯
E
⎯
N pin, either
⎯
P
⎯
B or UVLO
must be held low for at least t
PD, Min
(internal default power down timer) +
t
PDT
(adjustable by placing external capacitor at PDT pin).
Note 5:
The
⎯
K
⎯
I
⎯
L
⎯
L turn on blanking timer period (t
KILL, ON BLANK
) is the
waiting period immediately after enable output is asserted. This blanking
time allows sufficient time for the DC/DC converter and the μP to perform
power up tasks. The
⎯
K
⎯
I
⎯
L
⎯
L,
⎯
P
⎯
B and UVLO inputs are ignored during this
period. If
⎯
K
⎯
I
⎯
L
⎯
L remains low at the end of this blanking period, the enable
output is released, thus turning off system power.
[i=s]This post was last edited by yichun417 on 2015-11-16 09:50[/i] To use R7F0C809 for two-wire module development, you must design a two-wire power board module to provide the power and reference vo...
Arrow and Texas Instruments held a technical seminar, where many engineers were concerned about isolators, security monitoring solutions and wearable devices. Pictures speak louder than words....
The specific situation is as follows: I call the backlight driver in the display driver code implementation, and the H file of the backlight driver is imported into the display driver code. The specif...
I would like to ask, how can I run the application developed in VS2005 on the Feiling ARM development board, instead of debugging it synchronously on the computer! What file format should I convert it...
It is used in low voltage difference analog amplification, and is also a chip used in photoelectric instruments. I will continue to share my experience with you....
[G] History is a mirror. The history of heat dissipation clearly reflects the growth of semiconductor technology. Heat dissipation is very important in power supply design. A good power supply product...
A single-chip microcomputer is also called a single-chip microcontroller. It is not a chip that completes a certain logical function, but a computer system integrated into one chip. In general, a c...[Details]
Remote keyless entry (RKE) systems have become popular with users, with more than 80% of new cars in North America and more than 70% in Europe equipped with RKE systems. In addition to the obvious ...[Details]
This paper designs a dot matrix LED text display screen that is easy to update, expandable, and low-cost. The way to reduce costs is
① Use the Bluetooth data transmission function of mobile ph...[Details]
1. System Structure
This system is a simulation system of indoor air-conditioning temperature/humidity control system. The data acquisition and control center collects temperature/humidity...[Details]
Since the No. 4 blast furnace of Handan Iron and Steel was put into operation in 1993, its external equipment has been seriously aged, and the original PLC control system TDC3000 of the hot blast furn...[Details]
PV inverter manufacturer SMA has launched its first DC arc fault circuit interrupter (AFCI) PV inverter and has received UL certification.
The new SunnyBoy AFCI inverter models include 3000-US...[Details]
Spatial Division Multiplexing (SDM) MIMO processing can significantly improve spectrum efficiency and thus greatly increase the capacity of wireless communication systems. Spatial Division Multip...[Details]
LED light sources have many environmental advantages, but early products still have certain technical bottlenecks in heat dissipation and high brightness design that cannot be broken through....[Details]
System Overview
The system consists of a signal preprocessing circuit, a single-chip computer AT89C2051, a systematic LED display module, a serial port data storage circuit and system software...[Details]
Against the backdrop of global warming, energy conservation and emission reduction have become a global hotspot and focus, which has also sounded the clarion call for the take-off of the LED lighti...[Details]
One in five car failures are caused by batteries, a problem that will become more serious in the coming years as electric-by-wire, start/stop engine management and hybrid (electric/gas) vehicles be...[Details]
The future energy storage hotspot is not coal or iron ore, but lithium. This lightest metal in nature may be the heaviest resource in the future energy landscape. China launched an ambitious electr...[Details]
DCDC means DC to DC (conversion of different DC power values). Anything that meets this definition can be called a DCDC converter. Specifically, it means converting the input DC into AC through a s...[Details]
1 Introduction
Washing machines are an indispensable household appliance in the home, and they are developing very fast. Fully automatic washing machines are favored by everyone because of their con...[Details]
Renesas Electronics MCUs
京公网安备 11010802033920号
EEWORLD
