General Description nThe LM2672 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version. nRequiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947), fixed frequency oscillator, external shutdown, soft-start, and frequency synchronization.nFeatures n■ Efficiency up to 96% n■ Available in SO-8, 8-pin DIP and LLP packages n■ Computer Design Software LM267X Made Simple version 6.0 n■ Simple and easy to design with n■ Requires only 5 external components n■ Uses readily available standard inductors n■ 3.3V, 5.0V, 12V, and adjustable output versions n■ Adjustable version output voltage range: 1.21V to 37V n■ ±1.5% max output voltage tolerance over line and load conditions n■ Guaranteed 1A output load current n■ 0.25Ω DMOS Output Switch n■ Wide input voltage range: 8V to 40V n■ 260 kHz fixed frequency internal oscillator n■ TTL shutdown capability, low power standby mode n■ Soft-start and frequency synchronization n■ Thermal shutdown and current limit protectionnTypical Applications n■ Simple High Efficiency (>90%) Step-Down (Buck) Regulator n■ Efficient Pre-Regulator for Linear Regulators
