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Voltage Monitor. LTC2909 Datasheet

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Voltage Monitor. LTC2909 Datasheet






LTC2909 Monitor. Datasheet pdf. Equivalent




LTC2909 Monitor. Datasheet pdf. Equivalent





Part

LTC2909

Description

Negative Voltage Monitor



Feature


U U FEATURES ■ Two Low Voltage Adjust able Inputs (0.5V) ■ Pin Selectable I nput Polarity Allows Negative and OV Mo nitoring ■ Guaranteed Threshold Accur acy: ±1.5% ■ 6.5V Shunt Regulator fo r High Voltage Operation ■ Low 50μA Quiescent Current ■ Buffered 1V Refer ence for Negative Supply Offset ■ Inp ut Glitch Rejection ■ Adjustable Rese t Timeout Period ■ Selectable Intern.
Manufacture

Linear Technology

Datasheet
Download LTC2909 Datasheet


Linear Technology LTC2909

LTC2909; al Timeout Saves Components ■ Open-Dra in ⎯R⎯S⎯T Output ■ Accurate UVL O for 2.5V, 3.3V, 5V Systems ■ Ultral ow Voltage Reset: VCC = 0.5V Guaranteed ■ Space Saving 8-Lead TSOT-23 and 3m m × 2mm DFN Packages U APPLICATIO S Desktop and Notebook Computers ■ Ha ndheld Devices ■ Network Servers ■ Core, I/O Monitor ■ Automotive LTC29 09 Precision Triple/Dual Input UV, OV and N.


Linear Technology LTC2909

egative Voltage Monitor DESCRIPTIO The L TC®2909 is a dual input monitor intend ed for a variety of system monitoring a pplications. Polarity selection and a b uffered reference output allow the LTC2 909 to monitor posi .


Linear Technology LTC2909

.

Part

LTC2909

Description

Negative Voltage Monitor



Feature


U U FEATURES ■ Two Low Voltage Adjust able Inputs (0.5V) ■ Pin Selectable I nput Polarity Allows Negative and OV Mo nitoring ■ Guaranteed Threshold Accur acy: ±1.5% ■ 6.5V Shunt Regulator fo r High Voltage Operation ■ Low 50μA Quiescent Current ■ Buffered 1V Refer ence for Negative Supply Offset ■ Inp ut Glitch Rejection ■ Adjustable Rese t Timeout Period ■ Selectable Intern.
Manufacture

Linear Technology

Datasheet
Download LTC2909 Datasheet




 LTC2909
FEATURES
Two Low Voltage Adjustable Inputs (0.5V)
Pin Selectable Input Polarity Allows Negative
and OV Monitoring
Guaranteed Threshold Accuracy: ±1.5%
6.5V Shunt Regulator for High Voltage Operation
Low 50μA Quiescent Current
Buffered 1V Reference for Negative Supply Offset
Input Glitch Rejection
Adjustable Reset Timeout Period
Selectable Internal Timeout Saves Components
Open-Drain RST Output
Accurate UVLO for 2.5V, 3.3V, 5V Systems
Ultralow Voltage Reset: VCC = 0.5V Guaranteed
Space Saving 8-Lead TSOT-23 and 3mm × 2mm DFN
Packages
U
APPLICATIO S
Desktop and Notebook Computers
Handheld Devices
Network Servers
Core, I/O Monitor
Automotive
LTC2909
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
DESCRIPTIO
The LTC®2909 is a dual input monitor intended for a variety
of system monitoring applications. Polarity selection and
a buffered reference output allow the LTC2909 to monitor
positive and negative supplies for undervoltage (UV) and
overvoltage (OV) conditions.
The two inputs have a nominal 0.5V threshold, featuring
tight 1.5% threshold accuracy over the entire operating
temperature range. Glitch filtering ensures reliable reset
operation without false triggering. A third fixed-threshold
UVLO monitor on the part’s VCC (also 1.5% accuracy) is
available for standard logic supplies.
The common reset output has a timeout that may use
a preset 200ms, be set by an external capacitor or be
disabled. A three-state input pin sets the input polarity
of each adjustable input without requiring any external
components.
The LTC2909 provides a highly versatile, precise, space-
conscious, micropower solution for supply monitoring.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3.3V UV/OV (Window) Monitor Application with
200ms Internal Timeout (3.3V Logic Out)
3.3V
RP6
453k
RP5
10.7k
RP4
76.8k
CBYP
100nF
VCC
ADJ1
RST
LTC2909-2.5
REF SEL
RPU
10k
ADJ2
TMR
GND
2909 TA01a
FAULT
OUTPUT
SEL Pin Connection for Input Polarity
Combinations
POLARITY
ADJ1
ADJ2
SEL PIN
+ + VCC
+ – OPEN
– – GND
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 LTC2909
LTC2909
ABSOLUTE AXI U RATI GS (Notes 1, 2)
Terminal Voltages
VCC (Note 3)............................................. –0.3V to 6V
SEL, RST .............................................. –0.3V to 7.5V
ADJ1, ADJ2 .......................................... –0.3V to 7.5V
TMR..........................................–0.3V to (VCC + 0.3V)
Terminal Currents
IVCC (Note 3)....................................................±10mA
IREF ....................................................................±1mA
Operating Temperature Range
LTC2909C ................................................ 0°C to 70°C
LTC2909I .............................................– 40°C to 85°C
Storage Temperature Range
DFN....................................................– 65°C to 125°C
TSOT-23.............................................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23............................................................ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SEL 1
8 ADJ1
TMR 2
7 ADJ2
9
VCC 3
6 REF
RST 4
5 GND
DDB PACKAGE
8-LEAD (3mm ´ 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 9) MAY BE LEFT OPEN OR TIED TO GND
(PCB CONNECTION REQUIRED FOR STATED θJA)
ORDER PART
NUMBER
LTC2909CDDB-2.5
LTC2909IDDB-2.5
LTC2909CDDB-3.3
LTC2909IDDB-3.3
LTC2909CDDB-5
LTC2909IDDB-5
DDB PART*
MARKING
LBXG
LBXG
LBZS
LBZS
LBZT
LBZT
TOP VIEW
ADJ1 1
ADJ2 2
REF 3
GND 4
8 SEL
7 TMR
6 VCC
5 RST
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/W
ORDER PART
NUMBER
LTC2909CTS8-2.5
LTC2909ITS8-2.5
LTC2909CTS8-3.3
LTC2909ITS8-3.3
LTC2909CTS8-5
LTC2909ITS8-5
TS8 PART*
MARKING
LTBXF
LTBXF
LTBZV
LTBZV
LTBZW
LTBZW
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
*The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
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 LTC2909
LTC2909
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.5V (LTC2909-2.5), VCC = 3.3V (LTC2909-3.3), VCC = 5V
(LTC2909-5), ADJ1 = ADJ2 = 0.55V, SEL = floating, unless otherwise noted. (Note 2)
SYMBOL
VCC(MIN)
VCC(SHUNT)
ICC
VRT
ΔVRT
IADJ
VCC(UVLO)
PARAMETER
Operating Supply Voltage
VCC Shunt Regulation Voltage
VCC Input Current
ADJ Input Threshold
ADJ Hysteresis (Note 4)
ADJ Input Current
VCC UVLO Threshold
ΔVCC(UVLO)
VREF
ITMR(UP)
ITMR(DOWN)
tRST(EXT)
tRST(INT)
VTMR(DIS)
ΔVTMR(DIS)
VTMR(INT)
ΔVTMR(INT)
tPROP
tUV
VOL(RST)
UVLO Hysteresis (Note 4)
Buffered Reference Voltage
TMR Pull-Up Current
TMR Pull-Down Current
Reset Timeout Period, External
Reset Timeout Period, Internal
Timer Disable Voltage
Timer Disable Hysteresis
Timer Internal Mode Voltage
Timer Internal Mode Hysteresis
ADJx Comparator Propagation Delay
to RST
VCC Undervoltage Detect to RST
RST Output Voltage Low
IOH(RST)
RST Output Voltage High Leakage
Three-State Input SEL
VIL
VIH
VZ
ISEL(Z)
Low Level Input Voltage
High Level Input Voltage
Pin Voltage when Left in Open State
Allowable Leakage in Open State
ISEL SEL Input Current
CONDITIONS
RST in Correct State
IVCC = 1mA, IVREF = 0
2.175 < VCC < 6V
TMR = VCC
VADJ = 0.55V
LTC2909-2.5
LTC2909-3.3
LTC2909-5
TMR = VCC
VCC > 2.175V, IVREF = ±1mA
VTMR = 1V
VTMR = 1V
CTMR = 2.2nF
VTMR = 0V
VTMR Rising
VTMR Falling
VTMR Falling
VTMR Rising
ADJx Driven Beyond Reset Threshold
(VRTX) by 5mV
VCC Less Than UVLO Threshold
(VCC(UVLO)) by 1%
VCC = 0.5V, I = 5μA
VCC = 1V, I = 100μA
VCC = 3V, I = 2500μA
RST = VCC
ISEL = 0μA
SEL = VCC or SEL = GND
MIN TYP MAX
0.5
6.0 6.5 6.9
50 150
0.4925 0.5000 0.5075
1.5 3.5 10.0
±15
2.175
2.871
4.350
2.213
2.921
4.425
2.250
2.970
4.500
0.3 0.7 2.0
0.985 1.000 1.015
–1.5 –2.1 –2.7
1.5 2.1 2.7
16 20 25
150 200 260
VCC VCC VCC
– 0.36 – 0.25 – 0.16
60 110 150
0.14 0.21 0.27
40
70 110
50 150 500
UNITS
V
V
μA
V
mV
nA
V
V
V
%
V
μA
μA
ms
ms
V
mV
V
mV
μs
50 150 500
μs
0.01 0.15
V
0.01 0.15
V
0.10 0.30
V
±1 μA
0.4
1.4
0.9
±5
±10
±25
V
V
V
μA
μA
μA
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: VCC maximum pin voltage is limited by input current. Since the
VCC pin has an internal 6.5V shunt regulator, a low impedance supply
which exceeds 6V may exceed the rated terminal current. Operation
from higher voltage supplies requires a series dropping resistor. See
Applications Information.
Note 4: Threshold voltages have no hysteresis unless the part is in
comparator mode. Hysteresis is one-sided, affecting only invalid-to-valid
transitions. See Applications Information.
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