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LTC2921 数据表(PDF) 1 Page - Linear Technology

部件名 LTC2921
功能描述  Precision Quad Supply Monitor in 6-Lead SOT-23
Download  16 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2921 数据表(HTML) 1 Page - Linear Technology

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LTC2903-1
29031f a
Multivoltage Systems
Optical Networking Systems
Cell Phone Base Stations
Network Servers
Precision Quad Supply
Monitor in 6-Lead SOT-23
, LTC and LT are registered trademarks of Linear Technology Corporation.
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 (ThinSOT
TM) Package
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.
ThinSOT is a trademark of Linear Technology Corporation.
VIN, INPUT SUPPLY VOLTAGE (V)
0
0.06
0.08
0.10
0.8
2903 TA01b
0.04
0.02
0.05
0.07
0.09
0.03
0.01
0
0.2
0.1
1µA
0.4
0.3
0.6 0.7
0.9
0.5
1
2µA
5µA
20µA
VIN = V1 = V2 = V3
LTC2903-B1
10µA
Low Voltage Reset Pull-Down Performance
vs External Pull-Up Current and Input Supply Voltage
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
V1
GND
V2
RST
V4
V3
LTC2903-B1
C1
0.1µF
1.8V
C2
0.1µF
2903 TA01
2.5V
3.3V
5V
DC/DC
CONVERTER
SYSTEM
LOGIC


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