The TPPM0301 is a low-dropout regulator with auxiliary power management that provides a constant 3.3-V supply at the output capable of driving a 400-mA load. The TPPM0301 provides a regulated power output for systems that have multiple input sources and require a constant voltage source with a low-dropout voltage. This is a single output, multiple input intelligent power source selection device with a low-dropout regulator for either 5VCC or 5VAUX inputs, and a low- resistance bypass switch for the 3.3VAUX input. Transitions may occur from one input supply to another without generating a glitch, outside of the specification range, on the 3.3-V output. The device has an incorporated reverse blocking scheme to prevent excess leakage from the input terminals in the event that the output voltage is greater than the input voltage. The input voltage is prioritized in the following order: 5VCC, 5VAUX, and 3.3VAUX.
The TPPM0301 provides a constant 3.3‑V output capable of driving a 400‑mA load. It features intelligent source selection among 5VCC, 5VAUX, and 3.3VAUX inputs, a glitch‑free transition between sources, and a reverse‑blocking scheme to prevent leakage when the output exceeds the input voltage.
The datasheet includes functional block diagrams, terminal definitions, input‑selection tables, absolute maximum ratings, recommended operating conditions, electrical characteristics, thermal management guidelines, and mechanical package dimensions. Thermal resistance and power‑dissipation limits are detailed to ensure reliable operation within the specified temperature range.
| Output voltage | 3.3 V |
|---|---|
| Maximum output current | 400 mA |
| 5‑V main input voltage range | 4.5 V to 5.5 V |
| Dropout voltage (400 mA) | 1 V |
The input voltage is prioritized in the following order: 5VCC, 5VAUX, and 3.3VAUX.
The device can drive a load up to 400 mA.
5‑V main input: 4.5 V–5.5 V; 5‑V auxiliary input: 4.5 V–5.5 V; 3.3‑V auxiliary input: 3 V–3.6 V.