The AOZ29303QI is a highly integrated step‑down DC‑DC power module that combines a buck converter, inductor and passive components in a compact QFN package. It operates from 4.5 V to 30 V input and delivers up to 3 A continuous output with up to 93 % peak efficiency and 87 % duty‑cycle capability.
The device is configurable via external components: output voltage is set with a resistor divider, soft‑start with a capacitor, and switching frequency (200 kHz‑1 MHz) with a resistor. It includes multiple protection features and is supplied in a 9 mm × 6 mm × 3.7 mm QFN‑48L package suitable for industrial, automotive and networking applications. This manual is written in Chinese.
| Input voltage range | 4.5 V to 30 V |
|---|---|
| Output voltage range | 0.8 V to 5.5 V (adjustable) |
| Continuous output current | up to 3 A |
| Switching frequency range | 200 kHz to 1 MHz |
| Maximum duty cycle | 87 % |
| Peak efficiency | up to 93 % |
| Shutdown current | 10 µA |
| Package dimensions | 9 mm × 6 mm × 3.7 mm (QFN‑48L) |
| Thermal resistance (ΘJA) | 19.3 °C/W |
| Ambient temperature range | -40 °C to +85 °C |
The module operates from 4.5 V up to 30 V input.
The output voltage is set using a resistor divider network (R1 and R2).
The switching frequency can be programmed up to 1 MHz.
The device provides cycle‑by‑cycle over‑current, output short‑circuit, output over‑voltage, and over‑temperature protection.