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LTC2934ITS8-2#TRPBF

P1-P3P4-P6P7-P9P10-P12
LTC2934
1
2934f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Ultra-Low Power
Adjustable Supervisor with
Power-Fail Output
The LTC
®
2934 ultra-low power voltage monitor provides
system initialization, power-fail warning and reset gen-
eration functions. Low quiescent current (500nA typical)
makes the LTC2934 an ideal choice for battery-operated
applications.
Precision power-fail and reset voltages can be confi gured
independently. Early warning of an impending low volt-
age condition is provided at the power-fail output (PFO)
when the PFI input falls below 0.4V. Supervisory circuits
monitor the ADJ input and pull RST low when ADJ falls
below 0.4V. When ADJ is rising from an under-threshold
condition, an internal reset timer is started after exceeding
the ADJ threshold by 5%. The reset timeout delays the
return of the RST output to a high state. A pushbutton
switch connected to the MR input is typically used to
force a manual reset. Outputs RST and PFO are available
with open-drain (LTC2934-1) or active pull-up circuits
(LTC2934-2). Operating temperature range is from –40ºC
to 85ºC.
Confi gurable Low Power Voltage Supervisor
n
500nA Quiescent Current
n
±1.5% (Max) Accuracy over Temperature
n
Operates Down to 1.6V Supply
n
Adjustable Reset Threshold
n
Adjustable Power-Fail Threshold
n
Early Warning Power-Fail Output
n
Selectable 15ms or 200ms Reset Timeout
n
Manual Reset Input
n
Compact 8-Lead, 2mm × 2mm DFN and TSOT-23
(ThinSOT™) Packages
n
Portable Equipment
n
Battery-Powered Equipment
n
Security Systems
n
Point-of-Sale Devices
n
Wireless Systems
, LT, LTC, 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.
Selectable Reset Timeout Period
V
CC
V
IN
BATTERY
POWERED
SYSTEM
LOGIC
2934 TA01a
0.1μF
PFO
RST
MR
LTC2934-2
GNDRT
ADJ
PFI
750k
11.8k
237k
POWER FAIL FALLING THRESHOLD = 1.686V
RESET FALLING THRESHOLD = 1.606V
RST, RT = GND
RST, RT = V
CC
V
CC
15ms
200ms
2934 TA01b
LTC2934
2
2934f
ABSOLUTE MAXIMUM RATINGS
Input Voltages
V
CC
........................................................... –0.3V to 6V
ADJ, PFI ................................................... –0.3V to 6V
RT, MR ......................................–0.3V to (V
CC
+ 0.3V)
Output Voltages
PFO, RST (LTC2934-1)............................. –0.3V to 6V
PFO, RST (LTC2934-2)..............–0.3V to (V
CC
+ 0.3V)
(Note 1)
TOP VIEW
V
CC
MR
RST
PFO
ADJ
PFI
RT
GND
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
9
4
1
2
3
6
5
7
8
T
JMAX
= 125°C, θ
JA
= 102°C/W
EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL
V
CC
MR
RST
PFO
ADJ 1
PFI 2
RT 3
GND 4
8
7
6
5
TOP VIEW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C, θ
JA
= 195°C/W
PIN CONFIGURATION
ORDER INFORMATION
RMS Currents
PFO, RST ..........................................................±5mA
Operating Ambient Temperature Range
LTC2934C ................................................ 0°C to 70°C
LTC2934I.............................................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 Package .............................................. 300°C
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2934CTS8-1#TRMPBF LTC2934CTS8-1#TRPBF LTDKR 8-Lead Plastic TSOT-23 0°C to 70°C
LTC2934ITS8-1#TRMPBF LTC2934ITS8-1#TRPBF LTDKR 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC2934CTS8-2#TRMPBF LTC2934CTS8-2#TRPBF LTDKS 8-Lead Plastic TSOT-23 0°C to 70°C
LTC2934ITS8-2#TRMPBF LTC2934ITS8-2#TRPBF LTDKS 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC2934CDC-1#TRMPBF LTC2934CDC-1#TRPBF LDKT
8-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC2934IDC-1#TRMPBF LTC2934IDC-1#TRPBF LDKT
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC2934CDC-2#TRMPBF LTC2934CDC-2#TRPBF LDKV
8-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC2934IDC-2#TRMPBF LTC2934IDC-2#TRPBF LDKV
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
TRM = 500 pieces. *Temperature grades are identifi ed by a 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:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
LTC2934
3
2934f
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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
V
CC
Input Supply Voltage
l
1.6 5.5 V
I
CC
V
CC
Input Supply Current
l
225 500 1000 nA
Threshold Adjustment Inputs: ADJ, PFI
V
TH
Input Threshold (Monitored Voltage Falling)
l
394 400 406 mV
V
THM
ADJ to PFI Threshold Matching
l
±2 ±8 mV
V
ADJ(HYST)
Reset Threshold Hysteresis
(Monitored Voltage Rising)
l
18 20 25 mV
V
PFI(HYST)
Power-Fail Threshold Hysteresis
(Monitored Voltage Rising)
l
81015 mV
t
UV
Undervoltage Detect to RST or PFO Falling V
ADJ
or V
PFI
= V
TH
– 4mV (Note 3) 1 ms
I
TH(LKG)
Threshold Adjustment Input Leakage Current V
ADJ
or V
PFI
= 420mV
l
0.1 ±1 nA
Control Inputs: MR, RT
V
IN(TH)
Control Input Threshold RT
MR
l
l
0.3 • V
CC
0.4
0.7 • V
CC
1.4
V
V
t
PW
Input Pulse Width MR
l
20 μs
t
PD
Propagation Delay to RST Falling Manual Reset Falling
l
2520 μs
R
PU
Internal Pull-Up Resistance MR
l
600 900 1200 kΩ
I
LK
Input Leakage Current (RT Input) RT = V
CC
or GND
l
±1 ±10 nA
Reset and Power Fail Outputs: RST, PFO
V
OL
Voltage Output Low V
CC
= 1V, 200μA Pull-Up Current
V
CC
= 3V, 3mA Pull-Up Current
l
l
25
50
100
150
mV
mV
V
OH
Voltage Output High (LTC2934-2) –200μA Pull-Down Current
l
0.7 • V
CC
V
I
OH
Leakage Current, Output High (LTC2934-1) V
RST
, V
PFO
= 3.6V
l
±1 ±10 nA
t
RST
Reset Timeout Period RT Input High
RT Input Low
l
l
140
10
200
15
260
25
ms
ms
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C, V
CC
= 3.6V, unless otherwise noted. (Note 2)
Note 2. All currents into pins are positive, all voltages are referenced to
GND unless otherwise noted.
Note 3. Guaranteed by design. Characterized, but not production tested.
P1-P3P4-P6P7-P9P10-P12

LTC2934ITS8-2#TRPBF

Mfr. #:
Buy LTC2934ITS8-2#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Ultra-Low Power Adjustable Supervisor with Power-Fail Output
Lifecycle:
New from this manufacturer.
Delivery:
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