LTC2934
Ultra-Low Power
Adjustable Supervisor with
Power-Fail Output
FEATURES DESCRIPTION
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500nA Quiescent Current
The LTC 2934 ultra-low power voltage monitor provides
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1.5% (Max) Accuracy over Temperature
system initialization, power-fail warning and reset gen-
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Operates Down to 1.6V Supply
eration functions. Low quiescent current (500nA typical)
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Adjustable Reset Threshold
makes the LTC2934 an ideal choice for battery-operated
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Adjustable Power-Fail Threshold
applications.
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Early Warning Power-Fail Output
Precision power-fail and reset voltages can be con gured
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Selectable 15ms or 200ms Reset Timeout
independently. Early warning of an impending low volt-
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Manual Reset Input
age condition is provided at the power-fail output (PFO)
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Compact 8-Lead, 2mm 2mm DFN and TSOT-23
when the PFI input falls below 0.4V. Supervisory circuits
(ThinSOT) Packages
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
APPLICATIONS
the ADJ threshold by 5%. The reset timeout delays the
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Portable Equipment
return of the RST output to a high state. A pushbutton
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Battery-Powered Equipment
switch connected to the MR input is typically used to
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Security Systems
force a manual reset. Outputs RST and PFO are available
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Point-of-Sale Devices
with open-drain (LTC2934-1) or active pull-up circuits
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Wireless Systems
(LTC2934-2). Operating temperature range is from 40C
, LT, LTC, LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
to 85C.
a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
TYPICAL APPLICATION
Con gurable Low Power Voltage Supervisor Selectable Reset Timeout Period
V
IN
750k V
CC
V
CC
PFO
ADJ
0.1F
BATTERY
11.8k
15ms
LTC2934-2
POWERED
RST, RT = GND
PFI
SYSTEM
LOGIC
237k
200ms
MR RST RST, RT = V
CC
RT GND
2934 TA01b
2934 TA01a
POWER FAILFALLING THRESHOLD = 1.686V
RESET FALLING THRESHOLD = 1.606V
2934f
1LTC2934
ABSOLUTE MAXIMUM RATINGS
(Note 1)
RMS Currents
Input Voltages
PFO, RST ..........................................................5mA
V ........................................................... 0.3V to 6V
CC
Operating Ambient Temperature Range
ADJ, PFI ................................................... 0.3V to 6V
LTC2934C ................................................ 0C to 70C
RT, MR ......................................0.3V to (V + 0.3V)
CC
LTC2934I.............................................. 40C to 85C
Output Voltages
Storage Temperature Range ................... 65C to 150C
PFO, RST (LTC2934-1)............................. 0.3V to 6V
Lead Temperature (Soldering, 10 sec)
PFO, RST (LTC2934-2)..............0.3V to (V + 0.3V)
CC
TSOT-23 Package ..............................................300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
V 1 8 ADJ
CC
ADJ 1 8 V
CC
MR 2 7 PFI
9
PFI 2 7 MR
RST 3 6 RT
RT 3 6 RST
PFO 4 5 GND
GND 4 5 PFO
TS8 PACKAGE
DC PACKAGE
8-LEAD PLASTIC TSOT-23
8-LEAD (2mm 2mm) PLASTIC DFN
T = 125C, = 195C/W
JMAX JA
T = 125C, = 102C/W
JMAX JA
EXPOSED PAD (PIN 9) PCB GND CONNECTION OPTIONAL
ORDER INFORMATION
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 0C to 70C
LTC2934ITS8-1#TRMPBF LTC2934ITS8-1#TRPBF LTDKR 8-Lead Plastic TSOT-23 40C to 85C
LTC2934CTS8-2#TRMPBF LTC2934CTS8-2#TRPBF LTDKS 8-Lead Plastic TSOT-23 0C to 70C
LTC2934ITS8-2#TRMPBF LTC2934ITS8-2#TRPBF LTDKS 8-Lead Plastic TSOT-23 40C to 85C
LTC2934CDC-1#TRMPBF LTC2934CDC-1#TRPBF LDKT 8-Lead (2mm 2mm) Plastic DFN 0C to 70C
LTC2934IDC-1#TRMPBF LTC2934IDC-1#TRPBF LDKT 8-Lead (2mm 2mm) Plastic DFN 40C to 85C
LTC2934CDC-2#TRMPBF LTC2934CDC-2#TRPBF LDKV 8-Lead (2mm 2mm) Plastic DFN 0C to 70C
LTC2934IDC-2#TRMPBF LTC2934IDC-2#TRPBF LDKV 8-Lead (2mm 2mm) Plastic DFN 40C to 85C
TRM = 500 pieces. *Temperature grades are identi ed by a label on the shipping container.
Consult LTC Marketing for parts speci ed with wider operating temperature ranges.
Consult LTC Marketing for information on lead based nish parts.
For more information on lead free part marking, go to: