This datasheet details the ROHM BP5275 series of 3-terminal non-isolated step-down DC/DC converters. These products use a synchronous rectification system and integrate a control circuit, switching element, coil, and input/output capacitors, making operation stable without the need for external components. The high conversion efficiency and original heat dissipation structure enable the configuration of ultra-compact switching power supplies. It is possible to output 500mA without the need for a heat sink (800mA with a heat sink). In addition, the devices are pin-compatible with conventional TO-220 LDO regulators, making replacement easy. The low ripple voltage and high-precision output ensure stable operation against fluctuating main power supply voltages, making these devices ideal for use as local power supplies (e.g., for microcontrollers).
The BP5275 family are non‑isolated 3‑terminal step‑down DC/DC converters that integrate a control circuit, switching element and inductor, delivering a stable output without external components. They are pin‑compatible with standard 3‑pin LDOs and are suited for compact power supplies in devices such as copiers, PCs, AV equipment, and industrial tools.
The datasheet includes electrical characteristics (input voltage 4‑14 V, output options 1.8‑5 V, up to 500 mA without a heat sink), efficiency curves (up to 88 % at 12 V), protection features, and detailed application‑circuit guidelines. Safety and usage precautions for special environments are also provided.
| Output voltage options | 1.8 V, 2.5 V, 3.3 V, 5.0 V |
|---|---|
| Package type | SIP3 |
| Switching frequency | 15 MHz |
Yes, a timer‑latch type short‑circuit protection stops the output when a short occurs.
The BP5275‑25 can deliver 500 mA without a heat sink; higher currents require a heat sink.