LTC2908
Precision
Six Supply Monitor
FEATURES
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DESCRIPTIO
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Ultralow Voltage Reset: V
CC
= 0.5V Guaranteed*
Monitors Six Inputs Simultaneously:
5V, 3.3V, 2.5V, 1.8V, ADJ1, ADJ2 (LTC2908-A1)
3.3V, 2.5V, 1.8V, 1.5V, ADJ1, ADJ2 (LTC2908-B1)
Guaranteed Threshold Accuracy:
±
1.5% of
Monitored Voltage Over Temperature
Internal V
CC
Auto Select
Power Supply Glitch Immunity
200ms Reset Time Delay
Active Low Open-Drain RST Output
Low Profile (1mm) SOT-23 (ThinSOT
TM
) and Plastic
(2mm
×
3mm) DFN Packages
The LTC
®
2908 is a six supply monitor for systems with a
large number of supply voltages that require a precise and
compact solution. The common reset output remains low
until all six inputs have been in compliance for 200ms.
The LTC2908 features a tight 1.5% threshold accuracy
over the entire operating temperature range (– 40°C to
85°C) and glitch immunity to ensure reliable reset opera-
tion without false triggering. The open-drain RST output
state is guaranteed to be in the correct state as long as V1
and/or V2 is 0.5V or greater.
The LTC2908 also features two adjustable inputs with a
nominal threshold level at 0.5V. This product provides a
precise, space-conscious, micropower and general pur-
pose solution for any kind of system requiring supply
monitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*Patent pending.
APPLICATIO S
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Network Servers
Wireless Base Stations
Optical Networking Systems
Mulitvoltage Systems
Desktop and Notebook Computers
Handheld Devices
TYPICAL APPLICATIO
12V
DC/DC
DC/DC
DC/DC
DC/DC
DC/DC
3.3V
2.5V
Six Supply Monitor with 5% Tolerance
(12V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
RST Output Voltage vs V1
with 10k Pull-Up Resistor to V1
0.4
V3 = V4 = V
ADJ1
=
V
ADJ2
= GND
RST OUTPUT VOLTAGE (V)
1.8V
1.5V
1.2V
0.1µF 0.1µF
2.15M
100k
124k
100k
SYSTEM
V1
V2 V3 V4
V
ADJ1
LTC2908-B1
GND
V
ADJ2
RST
2908 TA01a
U
0.3
0.2
V2 = GND
0.1
V2 = V1
0
0
0.2
0.4
V1 (V)
2908 TA01b
U
U
0.6
0.8
sn2908 2908fs
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
