BD8312HFN is a high-efficiency step-down switching regulator with built-in power MOSFET from ROHM Co., Ltd. It supports output voltages of 1.2V, 1.8V, 3.3V, and 5V, with a maximum output current of 1.5A. The device operates at 1.5MHz, and its external inductor and capacitor can be downsized. It also features a built-in synchronous rectifier switch with a 15V rating, as well as a flexible phase compensation system. BD8312HFN is suitable for portable devices powered by 4 dry batteries or Li2cell and Li3cell batteries, as well as consumer devices with 5V/12V power supplies.
The BD8312HFN is a single‑chip step‑down switching regulator with a built‑in power MOSFET, designed for portable equipment powered by 4‑cell batteries or a 5 V/12 V supply. It offers high efficiency at 1.5 MHz, synchronous rectification, soft‑start, and timer‑latch protection.
The document provides a description of the IC, pin functions, block diagram, electrical characteristics, absolute maximum ratings, example application circuits, and ordering information, along with graphs of performance versus temperature and input voltage.
| Supply voltage range (VCC) | 3.5 V to 14 V |
|---|---|
| Output voltage options | 1.2 V, 1.8 V, 3.3 V, 5 V |
| Maximum output current (7.4 V input, 3.3 V output) | 1.2 A |
| Switching frequency | 1.5 MHz |
| Maximum input current | 1.0 A |
| Power dissipation | 630 mW |
| Operating temperature range | -25 °C to +85 °C |
| Storage temperature range | -55 °C to +150 °C |
| Junction temperature max | +150 °C |
The device operates with a supply voltage (VCC) from 3.5 V up to 14 V.
At a 7.4 V input and 3.3 V output, the regulator can deliver up to 1.2 A.
The internal oscillator runs at a fixed frequency of 1.5 MHz.