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LTC2920-1 Datasheet

  • LTC2920-1

  • Precision Quad Supply Monitor in 6-Lead SOT-23

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LTC2903-1
Precision Quad Supply
Monitor in 6-Lead SOT-23
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Ultralow Voltage Reset: V
CC
= 0.5V Guaranteed
Monitor Four Inputs Simultaneously
3.3V, 2.5V, 1.8V, ADJ (LTC2903-A1)
5V, 3.3V, 2.5V, 1.8V (LTC2903-B1)
5V, 3.3V, 1.8V, 鈥?.2V (LTC2903-C1)
Guaranteed Threshold Accuracy:
鹵1.5%
of
Monitored Voltage over Temperature
10% Undervoltage Monitoring
Low Supply Current: 20碌A(chǔ) Typical
200ms Reset Time Delay
Active Low Open-Drain RST Output
Power Supply Glitch Immunity
Low Profile (1mm) SOT-23 (ThinSOT
TM
) Package
The LTC
廬
2903-1 monitors up to four supply voltages. The
common reset output remains low until all four inputs
have been in compliance for 200ms. Voltage thresholds
maintain
鹵1.5%
accuracy over temperature (with respect
to the monitored voltage). The LTC2903-1 features an
open-drain RST output with a weak internal pullup.
Internal supply voltage (V
CC
) is generated from the greater
voltage on the V1, V2 inputs. The RST output is guaranteed
to sink at least 5碌A(chǔ) (V
OL
= 0.15V) for V1, V2 or V3 down
to 0.5V and will typically conduct current down to 0V.
Quiescent current is 20碌A(chǔ) typical, making the LTC2903-1
ideal for power conscious systems. The LTC2903-1 is
available in a 6-lead low profile (1mm) SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Multivoltage Systems
Optical Networking Systems
Cell Phone Base Stations
Network Servers
TYPICAL APPLICATIO
Low Voltage Reset Pull-Down Performance
vs External Pull-Up Current and Input Supply Voltage
0.10
5V
0.09
3.3V
DC/DC
2.5V
CONVERTER
1.8V
LTC2903-B1
RST
V1
GND
V2
V4
V3
2903 TA01
RESET PIN VOLTAGE (V)
SYSTEM
LOGIC
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
1碌A(chǔ)
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
V
IN
, INPUT SUPPLY VOLTAGE (V)
1
2碌A(chǔ)
5碌A(chǔ)
20碌A(chǔ)
10碌A(chǔ)
C1
0.1碌F
C2
0.1碌F
U
V
IN
= V1 = V2 = V3
2903 TA01b
U
U
29031f
1

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