LTC2912CDDB-1 LINER [Linear Technology], LTC2912CDDB-1 Datasheet

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LTC2912CDDB-1

Manufacturer Part Number
LTC2912CDDB-1
Description
Single UV/OV Voltage Monitor
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIONS
TYPICAL APPLICATION
Monitors Single Voltage
Adjustable UV and OV Trip Values
Guaranteed Threshold Accuracy: ±1.5%
Power Supply Glitch Immunity
Adjustable Reset Timeout with Timeout Disable
29μA Quiescent Current
Open-Drain OV and UV Outputs
Guaranteed OV and UV for V
Available in 8-Lead ThinSOT
DFN Packages
Desktop and Notebook Computers
Network Servers
Core, I/O Voltage Monitors
Single OV/UV Supply Monitor, 3.3V ±10% Tolerance
SUPPLY
POWER
3.3V
1k
4.53k
27.4k
VH
VL
0.1μF
GND
LTC2912-1
V
CC
TM
CC
LATCH
TMR
and (3mm × 2mm)
OV
UV
≥ 1V
22nF
TIMEOUT = 200ms
SYSTEM
2912 TA01a
DESCRIPTION
The LTC
supply undervoltage and overvoltage events. The VL and
VH monitor inputs include fi ltering to reject brief glitches,
thereby ensuring reliable reset operation without false or
noisy triggering. An adjustable timer defi nes the duration of
the overvoltage and undervoltage reset outputs which func-
tion independently. While the LTC2912 operates directly
from 2.3V to 6V supplies, an internal V
coupled with low supply current demand allows operation
from higher voltages such as 12V, 24V or 48V.
Three output confi gurations are available: the LTC2912-
1 has a latch control for the OV output; the LTC2912-2
has an OV and UV output disable feature for margining
applications; the LTC2912-3 is identical to the LTC2912-1
but with a noninverting, OV output.
The LTC2912 provides a precise, versatile, space-conscious
micropower solution for voltage monitoring.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
2912 voltage monitor is designed to detect power
10000
1000
100
10
Reset Time-Out Period vs Capacitance
1
0.1
TMR PIN CAPACITANCE, C
1
Voltage Monitor
Single UV/OV
10
TMR
100
(nF)
CC
LTC2912
2912 G08
shunt regulator
1000
1
2912fa

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LTC2912CDDB-1 Summary of contents

Page 1

FEATURES Monitors Single Voltage ■ ■ Adjustable UV and OV Trip Values Guaranteed Threshold Accuracy: ±1.5% ■ Power Supply Glitch Immunity ■ ■ Adjustable Reset Timeout with Timeout Disable 29μA Quiescent Current ■ Open-Drain OV and UV Outputs ■ Guaranteed ...

Page 2

... Lead Temperature (Soldering, 10 sec) TSOT ................................................................. 300° TMR EXPOSED PAD (PIN 9) IS GND, CONNECTION TO PCB OPTIONAL ORDER PART NUMBER LTCJW LTC2912CDDB-1 LTCJW LTC2912IDDB-1 LTCJW LTC2912HDDB-1 CC EXPOSED PAD (PIN 9) IS GND, CONNECTION TO PCB OPTIONAL ORDER PART NUMBER LTCJX LTC2912CDDB-2 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T noted. (Note 2) SYMBOL PARAMETER V V Shunt Regulator Voltage SHUNT CC ΔV V Shunt Regulator Load Regulation SHUNT CC V Supply Voltage (Note Minimum V Output ...

Page 4

LTC2912 TIMING DIAGRAMS VH Monitor Timing V VH UOT t t UOD UOTO Monitor Timing (TMR Pin Strapped UOT t t UOD UOD UV 1V TYPICAL PERFORMANCE CHARACTERISTICS Input Threshold Voltage vs Temperature ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS UV Output Voltage 0.55V SEL = SUPPLY VOLTAGE, V (V) CC 2912 G07 UV/OV, Voltage Output Low vs Output ...

Page 6

LTC2912 PIN FUNCTIONS (DFN/TSOT Packages) OV (Pin 6/Pin 3, LTC2912-3): Overvoltage Logic Output. Asserts high with a weak internal pull- input is above threshold. Latches high. May be pulled above V using an external pull-up. Leave pin ...

Page 7

APPLICATIONS INFORMATION Voltage Monitoring The LTC2912 is a low power voltage monitoring circuit with an undervoltage and an overvoltage input. A timeout period that holds OV and UV asserted after a fault has cleared is adjustable using an external capacitor ...

Page 8

LTC2912 APPLICATIONS INFORMATION Power-Up/Power-Down reaches 1V during power up, the UV output As soon asserts low and the OV output weakly pulls to V The LTC2912 is guaranteed to assert UV low, OV high (LTC2912-1, LTC2912-2) and ...

Page 9

APPLICATIONS INFORMATION When the VH input drops below its designed threshold, the UV pin asserts low. When the input recovers above its designed threshold, the UV output timer starts. If the input remains above the designed threshold when the timer ...

Page 10

LTC2912 APPLICATIONS INFORMATION The rise time on the UV, OV and 0V pins is limited by a 400k pull-up resistance similar formula esti- CC mates the output rise time (10% to 90%) at the UV, OV ...

Page 11

PACKAGE DESCRIPTION 0.61 ±0.05 (2 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.20 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE ...

Page 12

LTC2912 TYPICAL APPLICATION POWER SUPPLY RELATED PARTS PART NUMBER DESCRIPTION LTC690 5V Supply Monitor, Watchdog Timer and Battery Backup LTC694-3.3 3.3V Supply Monitor, Watchdog Timer and Battery Backup LTC699 5V Supply Monitor and Watchdog Timer LTC1232 5V Supply Monitor, Watchdog ...

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