7.1 Overview

The LM3102 Step-Down Switching Regulator features all required functions to implement a cost-effective, efficient buck power converter capable of supplying 2.5 A to a load. It contains Dual N-channel main and synchronous MOSFETs. The Constant ON-Time (COT) regulation scheme requires no loop compensation, results in fast load transient response and simple circuit implementation. The regulator can function properly even with an all ceramic output capacitor network, and does not rely on the ESR of the output capacitor for stability. The operating frequency remains constant with line variations due to the inverse relationship between the input voltage and the ON-time. The valley current limit detection circuit, with the limit set internally at 2.7 A, inhibits the main MOSFET until the inductor current level subsides.

The LM3102 can be applied in numerous applications and can operate efficiently for inputs as high as 42 V. Protection features include output overvoltage protection, thermal shutdown, V_CC UVLO, gate drive UVLO. The LM3102 is available in the thermally enhanced HTSSOP-20 package.