NCP1593AGEVB ON Semiconductor

DN05024/D Design Note DN05024/D Evaluation Boards for NCP1593 Synchronous Buck Regulator PCB Device Input Output Output Topology I/O Voltage Voltage Current Isolation NCP1593AGEVB NCP1593A Synchronous 4.0 to 5.5 V 1.2 V 3 A NONE DC DC NCP1593AGEVB NCP1593B Buck Characteristic MinTypMaxUnit Output Voltage 1.05 3.3 V Output Current 0 2 3 A Oscillator Frequency 1.0 MHz Peak Efficiency 96 % PCB Layers 4 DC-DC Converter Dimensions 1.8 X 2.6 Circuit Description The NCP1593 is a fixed 1 MHz, highoutput current, synchronous PWM converter that integrates a lowresistance, highside P channel MOSFET and a lowside Nchannel MOSFET. The NCP1593 utilizes internally compensated current mode control to provide good transient response, ease of implementation and excellent loop stability. It regulates input voltages from 4.0 V to 5.5 V down to an output voltage as low as 0.6 V and is able to supply up to 3 A of load current. The NCP1593 includes an internally fixed switching frequency, and an internal softstart to limit inrush current. Other features include cyclebycycle current limiting, 100% duty cycle operation, short circuit protection, power saving mode and thermal shutdown. November 2011, Rev.0 www.onsemi.com 1 DN05024/D Top Figure 1: Schematic and TOP Layer with Silkscreen November 2011, Rev.0 www.onsemi.com 2