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What is LTC2902?

This electronic component, produced by the manufacturer "Linear Integrated", performs the same function as "Programmable Quad Supply Monitor".


LTC2902 Datasheet PDF - Linear Integrated

Part Number LTC2902
Description Programmable Quad Supply Monitor
Manufacturers Linear Integrated 
Logo Linear Integrated Logo 


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LTC2902
Programmable Quad Supply
Monitor with Adjustable Reset Timer
and Supply Tolerance
FEATURES
DESCRIPTIO
s Simultaneously Monitors Four Supplies
s 16 User Selectable Combinations of 5V, 3.3V, 3V,
2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage
Thresholds
s Guaranteed Threshold Accuracy: ±1.5% of Monitored
Voltage Over Temperature
s Selectable Supply Tolerance: 5%, 7.5%,
10%, 12.5% Below Monitored Voltage
s Low Supply Current: 43µA Typ
s Adjustable Reset Time
s RESET Disable Pin for Margining Applications
s Open-Drain RST Output (LTC2902-1)
s Push-Pull RST Output (LTC2902-2)
s Individual Nondelayed Monitor Outputs for Each Supply
s Power Supply Glitch Immunity
Us Guaranteed RESET for VCC 1V
APPLICATIO S
s Desktop and Notebook Computers
s Multivoltage Systems
s Telecom Equipment
s Portable Battery-Powered Equipment
s Network Servers
The LTC®2902 is a programmable supply monitor for sys-
tems with up to four supply voltages. One of 16 preset or
adjustable voltage monitor combinations can be selected
using an external resistor divider connected to the pro-
gram pin. The preset voltage thresholds are digitally pro-
grammable to 5%, 7.5%, 10% or 12.5% below the nomi-
nal operating voltage, and are accurate to 1.5% over tem-
perature. All four voltage comparator outputs are con-
nected to separate pins for individual supply monitoring.
The reset delay time is adjustable using an external
capacitor. Tight voltage threshold accuracy and glitch
immunity ensure reliable reset operation without false
triggering. The RST output is guaranteed to be in the
correct state for VCC down to 1V and may be disabled
during supply margin testing. The LTC2902-1 features
an open-drain RST output, while the LTC2902-2 has a
push-pull RST output.
The 43µA supply current makes the LTC2902 ideal for power
conscious systems and the part may be configured to
monitor less than four inputs. The LTC2902-1/LTC2902-2
are available in the 16-lead narrow SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Quad Supply Monitor with Adjustable Tolerance (5V, 3.3V, 2.5V, 1.8V)
DC/DC
CONVERTER
5V
3.3V
2.5V
1.8V
C1
0.1µF
C2
0.1µF
R1
59k
1%
R2
40.2k
1%
SYSTEM
LOGIC
4
V1
3 13
V3 V4
2
R3
10k
POWER
GOOD
COMP1
16
COMP2
14
V2
1
COMP3
15
LTC2902-2 COMP4
12
VREF
6
RST
8
RDIS
MARGIN
11
VPG
GND
10
7
T0
9
T1
CRT
5 CRT
47nF
TOLERANCE = 5%
tRST = 216ms
2902 TA01
2902f
1

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LTC2902 equivalent
TYPICAL PERFOR A CE CHARACTERISTICS
LTC2902
2.5V Threshold Voltage
vs Temperature
2.375
2.350
5%
2.325
2.300
2.275
7.5%
2.250
2.225
10%
2.200
2.175
2.150
12.5%
2.125
2.100
– 60 –40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
2902 G04
ADJ Threshold Voltage
vs Temperature
0.508
0.503
5%
0.498
0.493
0.488
7.5%
0.483
0.478
0.473
10%
0.468
0.463
12.5%
0.458
0.453
– 60 –40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
2902 G07
IV1 vs Temperature
100
V1 = 5V
90 V2 = 3.3V
80
V3 = 2.5V
V4 = 1.8V
70
60
50
40
30
20
10
0
– 60 –40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
2902 G10
1.8V Threshold Voltage
vs Temperature
1.710
1.685
5%
1.660
1.635
1.610
1.585
7.5%
10%
1.560
1.535
12.5%
1.510
– 60 –40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
2902 G05
– ADJ Threshold Voltage
vs Temperature
0.018
0.012
0.006
0
–0.006
–0.012
–0.018
– 60 –40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
2902 G08
IV2 vs Temperature
1.5
V1 = 5V
1.4 V2 = 3.3V
1.3
V3 = 2.5V
V4 = 1.8V
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
– 60 –40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
2902 G11
1.5V Threshold Voltage
vs Temperature
1.425
1.405
5%
1.385
1.365
7.5%
1.345
1.325
10%
1.305
1.285
12.5%
1.265
– 60 –40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
2902 G06
VREF vs Temperature
1.228
1.216
5%
1.204
1.192
1.180
7.5%
1.168
1.156
1.144
10%
1.132
1.112
12.5%
1.108
1.096
– 60 –40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
2902 G09
IV3 vs Temperature
1.1
V1 = 5V
1.0 V2 = 3.3V
0.9
V3 = 2.5V
V4 = 1.8V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
– 60 –40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
2902 G12
2902f
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC2902 electronic component.


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