AP1501 150Khz, 3A PWM Buck DC/DC Converter is a DC-DC step-down converter from Anachip Corp. It has 3A output current, 1.23V to 37V output voltage range, 150Khz fixed switching frequency, built-in switching transistor and low power standby mode.
The AP1501 series are monolithic buck converters designed for high‑efficiency step‑down regulation. They support fixed 3.3 V, 5 V, 12 V outputs as well as an adjustable range of 1.23 V to 37 V, and can deliver up to 3 A without external switching transistors. The device includes thermal‑shutdown and current‑limit protection, and an ON/OFF pin for logic‑level shutdown, reducing standby current to about 150 µA.
Typical applications include simple high‑efficiency regulators, on‑card switching supplies, and positive‑to‑negative conversion. The AP1501 is offered in TO‑220‑5L and TO‑263‑5L packages, with thermal considerations such as heatsinking for the TO‑220 and copper‑area heat sinking for the TO‑263. Detailed electrical characteristics, pin assignments, and mechanical dimensions are provided for design integration.
| Switching frequency | 150 kHz ±15 % |
|---|---|
| Maximum output current | 3 A |
| Maximum input voltage | 40 V |
| Output voltage options | 3.3 V, 5 V, 12 V, or adjustable 1.23 V‑37 V |
| Efficiency (12 V, 3 A) | ≈73 % |
| Operating temperature range | -40 °C to +125 °C |
| Standby quiescent current (ON/OFF pin =5 V) | 150‑250 µA |
| Package types | TO‑220‑5L(R) and TO‑263‑5L |
| Thermal resistance (TO‑220‑5L) | ≈0.28 °C/W |
The device can supply up to 3 A of output load current.
It is offered in a 5‑lead TO‑220‑5L(R) package and a 5‑lead TO‑263‑5L surface‑mount package.
The AP1501 operates at a fixed switching frequency of 150 kHz with a tolerance of ±15 %.
The ON/OFF pin can be driven low to turn the regulator on and high (≈1.3 V threshold) to shut it down, reducing supply current to about 150 µA.