This reference design automatically provides a back-up voltage during a power interruption. It manages the charging of supercapitors and provides reverse blocking protection. The maximum supercapacitor charging current and voltage can be adjusted. When the input voltage fails a buck-boost converter (TPS63802) takes over and generates a constant backup voltage. The supercapacitor capacitance and voltage define the energy that is available for the backup. The PMP30693 provides a stable backup output of 3.7 V at 300 mA for more than 100 s until the output voltage drops.
| Output voltage options | PMP30693.1 |
|---|---|
| Vin (Min) (V) | 3.3 |
| Vin (Max) (V) | 5.3 |
| Vout (Nom) (V) | 3.7 |
| Iout (Max) (A) | 1 |
| Output Power (W) | 3.7 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | Buck Boost- 4 Switch |
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | Supercapacitor Backup Power Supply With Current Limit Reference Design | Oct. 25, 2019 | |
| More literature | A supercapacitor and battery backup power-supply design PPT | Dec. 02, 2021 | ||
| Application note | Supercapacitor Backup Power Supply w/ Current Limit for Smart Electricity Meter (Rev. A) | Aug. 03, 2021 |
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