ADP1874 Datasheet | Analog Devices

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 k Hz, 600 k Hz, and 1.0 MHz options No current-sense resistor required Power saving mode (PSM) for light loads (ADP1875 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 16-lead QSOP package APPLICATIONS Tele and networking systems Mid- to high-end servers Set-top boxes DSP core power supplies GENERAL DESCRIPTION The ADP1874/ADP1875 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. In addition, these devices offer optimum performance at low duty cycles by using a valley, current mode control architecture. This allows the ADP1874/ADP1875 to drive all N-channel power stages to regulate output voltages to as low as 0.6 V. The ADP1875 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the ADP1875 Power Saving Mode (PSM) section for more information). Available in three frequency options (300 k Hz, 600 k Hz, and 1.0 MHz, plus the PSM option), the ADP1874/ADP1875 are well suited for a wide range of applications that require a single-input power supply range from 2.95 V to 20 V. Low voltage biasing is supplied via a 5 V internal low dropout regulator (LDO). TYPICAL APPLICATIONS CIRCUIT VIN = 2.95V TO 20V CC CC2 VREG VOUT 10kΩ RTOP RBOT CVREG2 CVREG RRES ADP1874/ ADP1875 P...