This is a datasheet for ADP1878/ADP1879 chip. It is a synchronous buck controller with constant on time and valley current mode. It supports 2.95V to 20V power input voltage range, minimum output voltage of 0.6V. The chip has ±1.0% accuracy, supports all N-channel MOSFET power stages. It provides 300kHz, 600kHz and 1.0MHz options, no current sense resistor required. It has light load power saving mode (only ADP1879), resistor programmable current limit, internal pull-up resistor power good, programmable soft start, thermal overload protection, short circuit protection, standalone precision enable input, integrated bootstrap diode, precharged output and 14-lead LFCSP_WD package.
This document describes the ADP1878 and ADP1879 synchronous step‑down controllers, covering their features, electrical specifications, and typical application circuits. It includes detailed pin configurations, performance characteristics, and design guidelines for implementing the devices in power supply designs.
The datasheet also outlines thermal protection, power‑saving mode (PSM) for the ADP1879, and ordering information for the various frequency and package options. It is intended for design engineers needing precise data for circuit integration.
| Input voltage range | 2.95 V to 20 V |
|---|---|
| Minimum output voltage | 0.6 V |
| Quiescent current | 1.1 mA |
| Shutdown current | 140 pA to 225 pA |
| Thermal shutdown threshold | 155 °C |
| Operating temperature range | -40 °C to +125 °C |
| Package | 14‑lead LFCSP_WD |
| Switching frequency options | 300 kHz, 600 kHz, 1.0 MHz |
The devices operate with an input voltage from 2.95 V up to 20 V.
Both parts can regulate the output down to 0.6 V.
Yes, the ADP1879 includes a Power Saving Mode (PSM) that enables pulse‑skipping for improved efficiency at light loads.
Thermal shutdown triggers when the junction temperature rises to 155 °C.