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LTC2903-1

Linear Technology
Part Number LTC2903-1
Manufacturer Linear Technology
Description Precision Quad Supply Monitor
Published Jan 13, 2012
Detailed Description LTC2903-1 Precision Quad Supply Monitor in 6-Lead SOT-23 U U FEATURES ■ Ultralow Voltage Reset: VCC = 0.5V Guaranteed ...
Datasheet PDF File LTC2903-1 PDF File

LTC2903-1
LTC2903-1

Overview
LTC2903-1 Precision Quad Supply Monitor in 6-Lead SOT-23 U U FEATURES ■ Ultralow Voltage Reset: VCC = 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, –5.
2V (LTC2903-C1) 3.
3V, ADJ, ADJ, ADJ (LTC2903-D1) 5V, ADJ, ADJ, ADJ (LTC2903-E1) ■ Guaranteed Threshold Accuracy: ±1.
5% of Monitored Voltage over Temperature ■ 10% (A1, B1, C1) and 5% (D1, E1) Undervoltage Monitoring ■ Low Supply Current: 20µA Typical ■ 200ms Reset Time Delay ■ Active Low Open-Drain RST Output ■ Power Supply Glitch Immunity ■ Low Profile (1mm) SOT-23 (ThinSOTTM) Package U APPLICATIO S ■ Multivoltage Systems ■ Optical Networking Systems ■ Cell Phone Base Stations ■ Network Servers DESCRIPTIO The LTC®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 ±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 (VCC) is generated from the greater voltage on the V1, V2 inputs.
VCC = V1 for LTC2903-D1 and LTC2903-E1.
The RST output is guaranteed to sink at least 5µA (VOL = 0.
15V) for VCC down to 0.
5V and will typically conduct current down to 0V.
Quiescent current is 20µA 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.
TYPICAL APPLICATIO 5V 3.
3V DC/DC CONVERTER 2.
5V 1.
8V SYSTEM LOGIC C1 0.
1µF C2 0.
1µF LTC2903-B1 V1 RST GND V4 V2 V3 2903 TA01 Low Voltage Reset Pull-Down Performance vs External Pull-Up Current and Input Supply Voltage 0.
10 VIN = V1 = V2 = V3 0.
09 LTC2903-B1 0.
08 RESET PIN VOLTAGE (V) 0.
07 20µA 0.
06 10µA 0.
05 0.
04 5µA 0.
03 0.
02 2µA 0.
...


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