ADP1870/ADP1871 is a synchronous buck controller with constant on-time and valley current mode from Analog Devices.
The ADP1870/ADP1871 are current‑mode, synchronous step‑down controllers that offer a wide input range, low‑voltage output capability, and programmable current‑limit. Key features include a constant‑on‑time control scheme, power‑saving mode (PSM) for the ADP1871, and integrated bias regulator.
The devices are offered in 10‑lead MSOP and LFCSP packages and are suited for telecom, networking, servers, set‑top boxes, and DSP core power supplies. The datasheet includes detailed specifications, pin descriptions, typical performance curves, and design guidelines such as component selection and layout considerations.
| Power input voltage range | 2.95 V to 20 V |
|---|---|
| Minimum output voltage | 0.6 V |
| Switching frequency options | 300 kHz, 600 kHz, 1.0 MHz |
| Thermal shutdown threshold | 155 °C |
| Package types | 10‑lead MSOP and LFCSP |
The controller operates with a power input voltage from 2.95 V up to 20 V.
It can regulate the output down to 0.6 V.
Yes, the ADP1871 is the power‑saving mode (PSM) version that uses pulse‑skipping for light loads.
They are offered in 10‑lead MSOP and lead‑frame chip‑scale (LFCSP) packages.