LINEAR LTC1727 1728 User's Manual
Summary
These micropower precision monitors are essential voltage supervision circuits designed to ensure system stability across multiple power rails (e.g., 5V, 3.3V, Adjustable). The manual details highly accurate, low-current monitoring capabilities that guarantee reliable reset operation even during severe power supply glitches. Ideal for battery-powered equipment, notebooks, and network servers, the monitor maintains precise voltage thresholds while minimizing quiescent current draw for power-conscious embedded systems.
Page 1 Text Content
LTC1727/LTC1728 Micropower Precision Triple Supply Monitors in 8-Lead MSOP and
5-Lead SOT-23 Packages
FEATURES DESCRIPTIO Monitors Three Inputs Simultaneously The LTC®1727 is a triple supply monitor intended for LTC1727-5: 5V, 3.3V and ADJ systems with multiple supply voltages. Each supply moni-
LTC1727-2.5: 2.5V, 3.3V and ADJ tor has its own open-drain output for individual supply
LTC1728-5: 5V, 3.3V and ADJ monitoring. A common open-drain reset output remains LTC1728-2.5: 2.5V, 3.3V and ADJ low until all three supplies have been in compliance for
LTC1728-1.8: 3V, 1.8V and ADJ 200ms. Tight 1.5% accuracy specifications and glitch
LTC1728-3.3: 3.3V, 1.8V and ADJ immunity ensure reliable reset operation without false
±1.5% Threshold Accuracy Over Temperature triggering.
Very Low Supply Current: 10µA Typ
The LTC1728 is functionally identical to the LTC1727
200ms Reset Time Delay
without the individual monitor outputs.
Active Low RESET Output
Power Supply Glitch Immunity The RST output is guaranteed to be in the correct state for Guaranteed RESET for VCC3 ≥ 1V VCC5/VCC25/VCC18 or VCC3 down to 1V. The LTC1727/ or VCC5/VCC25/VCC18 ≥ 1V LTC1728 may also be configured to monitor any one or LTC1727 Includes Monitor Output for Each Supply two VCC inputs instead of three, depending on system
www.BDTIC.com/LINEAR requirements. LTC1727: 8-Lead MSOP and SO Packages
LTC1728: 5-Lead SOT-23 Package
Very low (10µA typical) supply current makes the LTC1727/ LTC1728 ideal for power conscious systems.
APPLICATIO S
The LTC1727 is available in an 8-lead MSOP or SO
Desktop Computers package and the LTC1728 is available in a 5-lead SOT-23 Notebook Computers package. Intelligent Instruments
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Portable Battery-Powered Equipment All other trademarks are the property of their respective owners. Network Servers
TYPICAL APPLICATIO 3.3V
Triple Supply Monitor with Power Good Output
DC/DC 5V SYSTEM
CONVERTER LOGIC (3.3V, 2.5V and Adjustable)
LTC1727-2.5
VCC3 RST 10k 10k
3.3V VCC3 COMP3 POWER
LTC1728-5
VCC5 2.5V VCC25 COMP25
61.9k R1ADJUSTABLE SYSTEM
VCCA RST
1% SUPPLY RESET
0.1µF VCCA GND
R2 GND COMPA
100k 1727/28 TA01
1727/28 TA08
17278fb
Page Summary Contents For LINEAR LTC1727 1728 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 316.25 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the supply current characteristic of this monitor?
It features a very low supply current, specified at 10µA typical, making it ideal for power conscious systems.
How low can the LTC monitors reliably detect voltage drops?
The RESET output guarantees proper signaling even when input voltages are down to 1V.
What is the required delay time before reset acknowledgment?
After a dip, a common open-drain reset output remains low until all three supplies have been stable and compliant for 200ms.
What packages are available for both the LTC1727 and LTC1728 parts?
The LTC1727 is available in an 8-lead MSOP or SO package, while the LTC1728 is housed in a 5-lead SOT-23 package.