LTC2903CS6-D1 Datasheet, PDF (1/16 Pages) Linear Technology – Precision Quad Supply Monitor in 6-Lead SOT-23

LTC2903-1
Precision Quad Supply
Monitor in 6-Lead SOT-23
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 (ThinSOT}^TM_{) 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 (V_CC) is generated from the greater
voltage on the V1, V2 inputs. V_CC = V1 for LTC2903-D1 and
LTC2903-E1. The RST output is guaranteed to sink at least
5µA (V_OL = 0.15V) for V_CC 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
V_IN = V1 = V2 = V3
0.09
LTC2903-B1
0.08
0.07
20µA
0.06
10µA
0.05
0.04
5µA
0.03
0.02
2µA
0.01
1µA
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
V_IN, INPUT SUPPLY VOLTAGE (V)
2903 TA01b
29031f a
1