LTC1728 - Micropower Precision Triple Supply Monitors in 8-Lead MSOP and 5-Lead SOT-23 Packages
Features
- Monitors Three Inputs Simultaneously
LTC1727-5: 5V, 3.3V and ADJ
LTC1727-2.5: 2.5V, 3.3V and ADJ
LTC1728-5: 5V, 3.3V and ADJ
LTC1728-2.5: 2.5V, 3.3V and ADJ
LTC1728-1.8: 3V, 1.8V and ADJ
LTC1728-3.3: 3.3V, 1.8V and ADJ - ±1.5% Threshold Accuracy Over Temperature
- Very Low Supply Current: 10µA Typ
- 200ms Reset Time Delay
- Active Low RESET Output
- Power Supply Glitch Immunity
- Guaranteed RESET for VCC3 ≥ 1V
- or VCC5/VCC25/VCC18 ≥ 1V
- LTC1727 Includes Monitor Output for Each Supply
- LTC1727: 8-Lead MSOP and SO Packages
- LTC1728: 5-Lead SOT-23 Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1727 is a triple supply monitor intended for systems with multiple supply voltages. Each supply monitor has its own open-drain output for individual supply monitoring. A common open-drain reset output remains low until all three supplies have been in compliance for 200ms. Tight 1.5% accuracy specifications and glitch immunity ensure reliable reset operation without false triggering.
The LTC1728 is functionally identical to the LTC1727 without the individual monitor outputs.
The RST output is guaranteed to be in the correct state for VCC5/VCC25/VCC18 or VCC3 down to 1V. The LTC1727/LTC1728 may also be configured to monitor any one or two VCC inputs instead of three, depending on system requirements.
Very low (10µA typical) supply current makes the LTC1727/LTC1728 ideal for power conscious systems.
The LTC1727 is available in an 8-lead MSOP or SO package and the LTC1728 is available in a 5-lead SOT-23 package.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1728ES5-1.8#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-1.8#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-1.8#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-2.5#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-2.5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-2.5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-3.3#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-3.3#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-3.3#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-5#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728ES5-5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1728HS5-5#PBF | SOT-23 | S5 | H | 05-08-1635 | Yes |
| LTC1728HS5-5#TRMPBF | SOT-23 | S5 | H | 05-08-1635 | Yes |
| LTC1728HS5-5#TRPBF | SOT-23 | S5 | H | 05-08-1635 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1728ES5-1.8#PBF | SOT-23 | E | $1.66 | Yes | ||
| LTC1728ES5-1.8#TRMPBF | SOT-23 | E | $1.66 | $1.45 | Yes | |
| LTC1728ES5-1.8#TRPBF | SOT-23 | E | $1.66 | $1.40 | Yes | |
| LTC1728ES5-2.5#PBF | SOT-23 | E | $1.66 | Yes | ||
| LTC1728ES5-2.5#TRMPBF | SOT-23 | E | $1.66 | $1.45 | Yes | |
| LTC1728ES5-2.5#TRPBF | SOT-23 | E | $1.66 | $1.40 | Yes | |
| LTC1728ES5-3.3#PBF | SOT-23 | E | $1.66 | Yes | ||
| LTC1728ES5-3.3#TRMPBF | SOT-23 | E | $1.66 | $1.45 | Yes | |
| LTC1728ES5-3.3#TRPBF | SOT-23 | E | $1.66 | $1.40 | Yes | |
| LTC1728ES5-5#PBF | SOT-23 | E | $1.66 | Yes | ||
| LTC1728ES5-5#TRMPBF | SOT-23 | E | $1.66 | $1.45 | Yes | |
| LTC1728ES5-5#TRPBF | SOT-23 | E | $1.66 | $1.40 | Yes | |
| LTC1728HS5-5#PBF | SOT-23 | H | $2.42 | Yes | ||
| LTC1728HS5-5#TRMPBF | SOT-23 | H | $2.42 | $1.75 | Yes | |
| LTC1728HS5-5#TRPBF | SOT-23 | H | $2.48 | $1.70 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.Click here to view our complete list of demo boards
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1728HS5-5#PBF | SOT-23 | H | $2.42 | Yes | ||
| LTC1728HS5-5#TRMPBF | SOT-23 | H | $2.42 | $1.75 | Yes | |
| LTC1728HS5-5#TRPBF | SOT-23 | H | $2.48 | $1.70 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- Desktop Computers
- Notebook Computers
- Intelligent Instruments
- Portable Battery-Powered Equipment
- Network Servers
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC1728-1.8
LTC1728-2.5
LTC1728-3.3
LTC1728-5
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
