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LTC2900-1CMS Datasheet Download

Part No.:
LTC2900-1CMS
Download:
Download Datasheet
Description:
[Programmable Quad Supply Monitor with Adjustable Reset Timer]
File Size:
200 K
Page:
16 Pages
Logo:
Manufacturer:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype
 LTC2900-1CMS Datasheet Page:2LTC2900-1CMS Datasheet Page:3LTC2900-1CMS Datasheet Page:4LTC2900-1CMS Datasheet Page:5LTC2900-1CMS Datasheet Page:6LTC2900-1CMS Datasheet Page:7LTC2900-1CMS Datasheet Page:8LTC2900-1CMS Datasheet Page:9 
LTC2900
Programmable Quad Supply
Monitor with Adjustable Reset Timer
FEATURES
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DESCRIPTIO
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Simultaneously Monitors Four Supplies
16 User Selectable Combinations of 5V, 3.3V, 3V,
2.5V, 1.8V, 1.5V and/or
±Adjustable
Voltage
Thresholds
Guaranteed Threshold Accuracy:
±1.5%
of
Monitored Voltage Over Temperature
Low Supply Current: 43µA Typ
Adjustable Reset Time
Small MSOP and 3mm
×
3mm DFN Packages
Manual Reset Pin
Open-Drain RST Output (LTC2900-1)
Push-Pull RST Output (LTC2900-2)
Power Supply Glitch Immunity
Guaranteed RST for V
CC
1V
The LTC
®
2900 is a programmable supply monitor for
systems with up to four supply voltages. One of 16 preset
or adjustable voltage monitor combinations can be se-
lected using an external resistor divider connected to the
program pin. The preset voltage thresholds are accurate
to
±1.5%
over temperature.
The reset delay time is adjustable using an external
capacitor and the manual reset input may be used with a
momentary switch to issue reset pulses with programmed
duration. Tight voltage threshold accuracy and glitch
immunity ensure reliable reset operation without false
triggering. The RST output is guaranteed to be in the
correct state for V
CC
down to 1V. The LTC2900-1 features
an open-drain RST output, while the LTC2900-2 has a
push-pull RST output.
The 43µA supply current makes the LTC2900 ideal for
power conscious systems and it may be configured to
monitor less than four inputs. The parts are available in
the 10-lead MSOP and the 10-lead 3mm
×
3mm DFN
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Desktop and Notebook Computers
Multivoltage Systems
Telecom Equipment
Portable Battery-Powered Equipment
Network Servers
TYPICAL APPLICATIO
Quad Supply Monitor (5V, 3.3V, 2.5V, 1.8V)
5V
3.3V
DC/DC
CONVERTER
2.5V
1.8V
V3
V4
V1
LTC2900-2
V2
V
REF
V
PG
GND
RST
PBR
CRT
C
RT
47nF
t
RST
= 216ms
2900f
C1
0.1µF
C2
0.1µF
R1
59k
1%
R2
40.2k
1%
PUSH-BUTTON
RESET
2900 TA01
U
SYSTEM
LOGIC
U
U
1