LTC2902 - Programmable Quad Supply Monitor with Adjustable Reset Timer and Supply Tolerance
Features
- 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 - Selectable Supply Tolerance: 5%, 7.5%,
10%, 12.5% Below Monitored Voltage - Low Supply Current: 43µA Typ
- Adjustable Reset Time
- RESET Disable Pin for Margining Applications
- Open-Drain RST Output (LTC2902-1)
- Push-Pull RST Output (LTC2902-2)
- Individual Nondelayed Monitor Outputs for Each Supply
- Power Supply Glitch Immunity
- Guaranteed RESET for VCC >/= 1V
Typical Application
Description
The LTC®2902 is a programmable supply monitor for systems with up to four supply voltages. One of 16 preset or adjustable voltage monitor combinations can be selected using an external resistor divider connected to the program pin. The preset voltage thresholds are digitally programmable to 5%, 7.5%, 10% or 12.5% below the nominal operating voltage, and are accurate to 1.5% over temperature. All four voltage comparator outputs are connected to separate pins for individual supply monitoring.
The reset delay time is adjustable using an external capacitor. 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 VCC down to 1V and may be disabled during supply margin testing. The LTC2902-1 features an open-drain RST output, while the LTC2902-2 has a push-pull RST output.
The 43µA supply current makes the LTC2902 ideal for power conscious systems and the part may be configured to monitor less than four inputs. The LTC2902-1/LTC2902-2 are available in the 16-lead narrow SSOP 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 |
|---|---|---|---|---|---|
| LTC2902-1CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2902-1CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2902-1IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2902-1IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2902-2CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2902-2CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC2902-2IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC2902-2IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC2902-1CGN#PBF | SSOP-16 | C | $3.30 | $2.35 | Yes | |
| LTC2902-1CGN#TRPBF | SSOP-16 | C | $2.41 | Yes | ||
| LTC2902-1IGN#PBF | SSOP-16 | I | $3.84 | $2.70 | Yes | |
| LTC2902-1IGN#TRPBF | SSOP-16 | I | $2.76 | Yes | ||
| LTC2902-2CGN#PBF | SSOP-16 | C | $3.30 | $2.35 | Yes | |
| LTC2902-2CGN#TRPBF | SSOP-16 | C | $2.41 | Yes | ||
| LTC2902-2IGN#PBF | SSOP-16 | I | $3.84 | $2.70 | Yes | |
| LTC2902-2IGN#TRPBF | SSOP-16 | I | $2.76 | 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
Applications
- Desktop and Notebook Computers
- Multivoltage Systems
- Telecom Equipment
- 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:
LTC2902-1
LTC2902-2
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.
