●General Description
●The LM2854 PowerWise® SIMPLE SWITCHER® buck regulator is a 500 kHz or 1 MHz step-down switching voltage regulator capable of driving up to a 4A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LM2854 can accept an input voltage rail between 2.95V and 5.5V and deliver an adjustable and highly accurate output voltage as low as 0.8V. Externally established soft-start with a small capacitor facilitates controlled start-up, and the LM2854 is capable of starting gracefully into a pre-biased output voltage. Partial internal compensation reduces the number of external passive components and PC board space typically necessary in a voltage mode buck converter application, yet preserving flexibility to deal with ceramic and/or electrolytic based load capacitors.
●Features
●■ Input voltage range of 2.95V to 5.5V
●■ Maximum load current of 4A
●■ Wide bandwidth voltage mode control loop, partial internal compensation
●■ Fixed switching frequency of 500 kHz or 1 MHz
●■ 35 mΩ integrated MOSFET switches
●■ Adjustable output voltage down to 0.8V
●■ Optimized reference voltage initial accuracy and temperature drift
●■ External soft-start control with tracking capability
●■ Enable pin with hysteresis
●■ Low standby current of 230 µA
●■ Pre-biased load startup capability
●■ Integrated UVLO, OCP and thermal shutdown
●■ 100% duty cycle capability
●■ eTSSOP-16 exposed pad package
●Applications
●■ Low Voltage POL Regulation from 5V or 3.3V Rail
●■ Local Solution for FPGA/DSP/ASIC/µP Core or I/O Power
●■ Broadband Networking and Communications Infrastructure
●■ Portable Computing
