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LTC2909IDDB-3.3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC2909
1
2909fb
SEL Pin Connection for Input Polarity
Combinations
POLARITY
ADJ1 ADJ2 SEL PIN
++
V
CC
+–
OPEN
––
GND
Precision Triple/Dual Input
UV, OV and Negative
Voltage Monitor
■
Desktop and Notebook Computers
■
Handheld Devices
■
Network Servers
■
Core, I/O Monitor
■
Automotive
■
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
⎯
R
⎯
S
⎯
T Output
■
Accurate UVLO for 2.5V, 3.3V, 5V Systems
■
Ultralow Voltage Reset: V
CC
= 0.5V Guaranteed
■
Space Saving 8-Lead TSOT-23 and 3mm × 2mm DFN
Packages
3.3V UV/OV (Window) Monitor Application with
200ms Internal Timeout (3.3V Logic Out)
V
CC
ADJ1
LTC2909-2.5
REF
ADJ2
RST
SEL
R
PU
10k
FAULT
OUTPUT
2909 TA01a
R
P6
453k
3.3V
R
P5
10.7k
R
P4
76.8k
C
BYP
100nF
TMR
GND
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 fi ltering ensures reliable reset
operation without false triggering. A third fi xed-threshold
UVLO monitor on the part’s V
CC
(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.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC2909
2
2909fb
Terminal Voltages
V
CC
(Note 3) ............................................. –0.3V to 6V
SEL,
⎯
R
⎯
S
⎯
T .............................................. –0.3V to 7.5V
ADJ1, ADJ2 .......................................... –0.3V to 7.5V
TMR ..........................................–0.3V to (V
CC
+ 0.3V)
Terminal Currents
I
VCC
(Note 3) ....................................................±10mA
I
REF
....................................................................±1mA
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 76°C/W
EXPOSED PAD (PIN 9) MAY BE LEFT OPEN OR TIED TO GND
(PCB CONNECTION REQUIRED FOR STATED θ
JA
)
*The temperature grade is identifi ed by a label on the shipping container. Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LBXG
LBXG
LBZS
LBZS
LBZT
LBZT
LTC2909CDDB-2.5
LTC2909IDDB-2.5
LTC2909CDDB-3.3
LTC2909IDDB-3.3
LTC2909CDDB-5
LTC2909IDDB-5
(Notes 1, 2)
ABSOLUTE AXI U RATI GS
W
WW
U
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
TOP VIEW
9
DDB PACKAGE
8-LEAD (3mm 2mm) PLASTIC DFN
5
6
7
8
4
3
2
1SEL
TMR
V
CC
RST
ADJ1
ADJ2
REF
GND
LTBXF
LTBXF
LTBZV
LTBZV
LTBZW
LTBZW
LTC2909CTS8-2.5
LTC2909ITS8-2.5
LTC2909CTS8-3.3
LTC2909ITS8-3.3
LTC2909CTS8-5
LTC2909ITS8-5
ADJ1 1
ADJ2 2
REF 3
GND 4
8 SEL
7 TMR
6 V
CC
5 RST
TOP VIEW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C, θ
JA
= 250°C/W
DDB PART*
MARKING
ORDER PART
NUMBER
TS8 PART*
MARKING
PACKAGE/ORDER I FOR ATIO
UUW
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/
LTC2909
3
2909fb
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 2.5V (LTC2909-2.5), V
CC
= 3.3V (LTC2909-3.3), V
CC
= 5V
(LTC2909-5), ADJ1 = ADJ2 = 0.55V, SEL = fl oating, unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC(MIN)
Operating Supply Voltage
⎯
R
⎯
S
⎯
T in Correct State
●
0.5 V
V
CC(SHUNT)
V
CC
Shunt Regulation Voltage I
VCC
= 1mA, I
VREF
= 0
●
6.0 6.5 6.9 V
I
CC
V
CC
Input Current 2.175 < V
CC
< 6V
●
50 150 µA
V
RT
ADJ Input Threshold
●
0.4925 0.5000 0.5075 V
ΔV
RT
ADJ Hysteresis (Note 4) TMR = V
CC
1.5 3.5 10.0 mV
I
ADJ
ADJ Input Current V
ADJ
= 0.55V
●
±15 nA
V
CC(UVLO)
V
CC
UVLO Threshold LTC2909-2.5
LTC2909-3.3
LTC2909-5
●
●
●
2.175
2.871
4.350
2.213
2.921
4.425
2.250
2.970
4.500
V
V
V
ΔV
CC(UVLO)
UVLO Hysteresis (Note 4) TMR = V
CC
0.3 0.7 2.0 %
V
REF
Buffered Reference Voltage V
CC
> 2.175V, I
VREF
= ±1mA
●
0.985 1.000 1.015 V
I
TMR(UP)
TMR Pull-Up Current V
TMR
= 1V
●
–1.5 –2.1 –2.7 µA
I
TMR(DOWN)
TMR Pull-Down Current V
TMR
= 1V
●
1.5 2.1 2.7 µA
t
⎯
R
⎯
S
⎯
T(EXT)
Reset Timeout Period, External C
TMR
= 2.2nF
●
16 20 25 ms
t
⎯
R
⎯
S
⎯
T(INT)
Reset Timeout Period, Internal V
TMR
= 0V
●
150 200 260 ms
V
TMR(DIS)
Timer Disable Voltage V
TMR
Rising
●
V
CC
– 0.36
V
CC
– 0.25
V
CC
– 0.16
V
ΔV
TMR(DIS)
Timer Disable Hysteresis V
TMR
Falling
●
60 110 150 mV
V
TMR(INT)
Timer Internal Mode Voltage V
TMR
Falling
●
0.14 0.21 0.27 V
ΔV
TMR(INT)
Timer Internal Mode Hysteresis V
TMR
Rising
●
40 70 110 mV
t
PROP
ADJx Comparator Propagation Delay
to
⎯
R
⎯
S
⎯
T
ADJx Driven Beyond Reset Threshold
(V
RTX
) by 5mV
●
50 150 500 µs
t
UV
V
CC
Undervoltage Detect to
⎯
R
⎯
S
⎯
TV
CC
Less Than UVLO Threshold
(V
CC(UVLO)
) by 1%
●
50 150 500 µs
V
OL(
⎯
R
⎯
S
⎯
T)
⎯
R
⎯
S
⎯
T Output Voltage Low V
CC
= 0.5V, I = 5µA
V
CC
= 1V, I = 100µA
V
CC
= 3V, I = 2500µA
●
●
●
0.01
0.01
0.10
0.15
0.15
0.30
V
V
V
I
OH(
⎯
R
⎯
S
⎯
T)
⎯
R
⎯
S
⎯
T Output Voltage High Leakage
⎯
R
⎯
S
⎯
T = V
CC
●
±1 µA
Three-State Input SEL
V
IL
Low Level Input Voltage
●
0.4 V
V
IH
High Level Input Voltage
●
1.4 V
V
Z
Pin Voltage when Left in Open State I
SEL
= 0µA 0.9 V
I
SEL(Z)
Allowable Leakage in Open State
●
±5
±10
µA
µA
I
SEL
SEL Input Current SEL = V
CC
or SEL = GND
●
±25 µA
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.
Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3: V
CC
maximum pin voltage is limited by input current. Since the
V
CC
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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC2909IDDB-3.3#TRPBF

Mfr. #:
Buy LTC2909IDDB-3.3#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Dual Supply Monitor with Selectable Polarity
Lifecycle:
New from this manufacturer.
Delivery:
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