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| 型號： | LTC2935ITS8-4#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 134K |
| 代理商： | LTC2935ITS8-4#TRPBF |
LTC2935
1
2935fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Ultra-Low Power Supervisor
with Power-Fail Output,
Selectable Thresholds
The LTC2935 ultra-low power voltage monitor provides
system initialization, power-fail warning and reset gen-
eration functions. Low quiescent current (500nA typical)
makes the LTC2935 an ideal choice for battery-operated
applications.
Three binary threshold-select inputs congure one of
eight integrated reset thresholds, ranging from 1.6V to
3.45V in pre-determined increments. Early warning of an
impending low voltage condition is provided at the power-
fail output (PFO), whose threshold is above the congured
reset threshold. Supervisory circuits monitor VCC and
pull RST low when VCC drops below the congured reset
threshold. When VCC is rising from an under-threshold
condition, an internal reset timer is started after exceeding
the reset threshold by 5%. A 200ms reset timeout delays
the return of the RST output to a high state. A pushbut-
ton switch connected to the MR input is typically used to
force a manual reset. Outputs RST and PFO are available
with open-drain (LTC2935-1/LTC2935-3) or active pull-up
(LTC2935-2/LTC2935-4) circuits. Operating temperature
range is from –40°C to 85°C.
Congurable Low Power Voltage Monitor
n 500nA Quiescent Current
n ±1.5% (Max) Accuracy over Temperature
n Integrated Precision Attenuators
n Eight Pin-Selectable Reset Thresholds
n Eight Pin-Selectable Power-Fail Thresholds
n Early Warning Power-Fail Output
n 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
Falling Threshold Selection Table
VCC
VIN
BATTERY
POWERED
SYSTEM
LOGIC
2935 TA01a
S2
S1
0.1μF
PFO
RST
S0
MR
LTC2935-2
GND
LTC2935-1/LTC2935-2
LTC2935-3/LTC2935-4
RESET
THRESHOLD
(V)
POWER-FAIL
THRESHOLD
(V)
RESET
THRESHOLD
(V)
POWER-FAIL
THRESHOLD
(V)
S2S1S0
3.30
3.45
2.44
2.56
Low
3.15
3.30
2.32
2.44
Low
High
3.00
3.15
2.20
2.32
Low
High
2.85
3.00
2.08
2.20
Low
High
Low
2.70
2.85
1.96
2.08
High
Low
2.55
2.70
1.84
1.96
High
Low
2.40
2.55
1.72
1.84
High
Low
High
2.25
2.40
1.60
1.72
High
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
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