GENERAL DESCRIPTION

The ADP1878/ADP1879 are versatile current-mode, synchronous step-down controllers. They provide superior transient response, optimal stability, and current-limit protection by using a constant on time, pseudo fixed frequency with a programmable current-limit, current control scheme. These devices offer optimum performance at low duty cycles by using a valley, current-mode control architecture allowing the ADP1878/ADP1879 to drive all N-channel power stages to regulate output voltages to as low as 0.6 V.

FEATURES

Power input voltage range: 2.95 V to 20 V

On-board bias regulator

Minimum output voltage: 0.6 V

0.6 V reference voltage with ±1.0 accuracy

Supports all N-channel MOSFET power stages

Available in 300 kHz, 600 kHz, and 1.0 MHz options

No current sense resistor required

Power saving mode (PSM) for light loads (ADP1879 only)

Resistor programmable current limit

Power good with internal pull-up resistor

Externally programmable soft start

Thermal overload protection

Short-circuit protection

Standalone precision enable input

Integrated bootstrap diode for high-side drive

Starts into a precharged output

Available in a 14-lead LFCSP_WD package

APPLICATIONS

Telecommunications and networking systems

Mid-to-high end servers

Set-top boxes

DSP core power supplies