The ADP1874/ADP1875 is a synchronous buck controller for a variety of power supply applications. The device features a constant on-time and valley current mode, wide input voltage range, low output voltage, low reference voltage, high accuracy, low power dissipation, low EMI, and high reliability.
The ADP1874 and ADP1875 are current‑mode, synchronous step‑down controllers that operate from 2.95 V to 20 V input and can regulate output voltages as low as 0.6 V. They are offered in a 16‑lead QSOP package with options for 300 kHz, 600 kHz or 1.0 MHz switching frequencies, and the ADP1875 includes a Power Saving Mode (PSM) for improved efficiency at light loads.
The document provides detailed specifications, absolute maximum ratings, pin‑out, typical performance curves, design equations, layout recommendations and ordering information, enabling designers to integrate the controller into telecom, server, set‑top box and DSP power supplies.
| Minimum Output Voltage | 0.6 V |
|---|---|
| Switching Frequency Options | 300 kHz, 600 kHz, 1.0 MHz |
| Thermal Shutdown Threshold | 155 °C |
| Package | 16‑lead QSOP |
PSM enables pulse‑skipping operation to keep the output regulated while improving system efficiency at light loads.
Connect an external capacitor from the SS pin to ground; use 10 nF for each millisecond of desired soft‑start delay.
The device operates from –40 °C to +125 °C junction temperature.
The controller is offered with 300 kHz, 600 kHz, and 1.0 MHz switching frequencies; the ADP1875 also supports the PSM option.