Nano power: wide VIN (12 V max) supervisor reference design used as comparator or power sequencer
Description
This reference design highlights a versatile use case for a low-power reset IC and a watchdog timer. With less than 1-µA current consumption, the TPS3840 device can be configured to work either as a comparator (with simple 3-pin configuration) or as a universal power supply supervisor that can be daisychained as a sequencer. Additionally, the response and delay time can be configured using an external capacitor. For applications requiring a watchdog operation, the TPS3431 device, a stand-alone programmable watchdog timer with ±2.5% accuracy (typ) can be used.
Features
- Threshold detection (TPS3840): Self-powered threshold detector using a voltage supervisor as a comparator (with 3-pin configuration and no external power supply) - Very low quiescent current (<700 nA) architectures with a set threshold from 1.6 V–4.9 V in 0.1-V steps and fast power-on (<250-µs startup delay) with a user-controllable response time (80 µs to 600 ms using external capacitor)
- Reset for power supply supervision and sequencing (TPS3840): Useful for multirail reset supervision and startup sequencing - Active low and active high configurations available with thresholds from 1.6 V–4.9 V and TD from 80 µs–600 ms
- Watchdog timer (TPS3431): User-adjustable timer with enable pin and wide input range - Low current consumption (20 µA maximum) for watchdog function and user-configurable timeout using an external resistor and capacitor
Applications
- Micro inverter
- Fault indicator (FI)
- Binary input module
- Traffic monitoring camera
Product Categories
- Power Management
| Part Number | Name | Companion Part | |
|---|---|---|---|
| OPA320SAIDBVT | OPA320SAIDBVT | Buy Datasheet | |
| TPS3431SDRBR | TPS3431SDRBR | Buy Datasheet | |
| TVS0500DRVR | TVS0500DRVR | Buy Datasheet | |
| TVS1400DRVR | TVS1400DRVR | Buy Datasheet |
| Download the bill of materials for TIDA-010041 | Download |
Test Data
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Download the test file for TIDA-010041| Title | Updated | Type | Size (KB) | |
|---|---|---|---|---|
| Nano Power, Wide VIN (12 V max) Supervisor Reference Design | 19 Dec 2018 | 4995 | ||
| TIDA-010041 Gerber | 19 Dec 2018 | ZIP | 382 | |
| TIDA-010041 CAD Files | 19 Dec 2018 | ZIP | 1645 | |
| TIDA-010041 PCB | 19 Dec 2018 | 961 | ||
| TIDA-010041 Assembly Drawing | 19 Dec 2018 | 341 | ||
| TIDA-010041 BOM | 19 Dec 2018 | 48 | ||
| TIDA-010041 Schematic and Block Diagram | 19 Dec 2018 | 514 |