The LM2670 series of regulators are monolithic integrated circuits which provide all of
the active functions for a step-down (buck) switching regulator capable of driving up to 3-A loads
with excellent line and load regulation characteristics. High efficiency (>90%) is obtained
through the use of a low ON-resistance DMOS power switch. The series consists of fixed output
voltages of 3.3-V, 5-V, and 12-V output version.
The SIMPLE SWITCHER® concept provides
for a complete design using a minimum number of external components. The switching clock frequency
can be provided by an internal fixed frequency oscillator (260 kHz) or from an
externally provided clock in the range of 280 kHz to 400 kHz which allows the use of physically
smaller sized components. A family of standard inductors for use with the LM2670 are available from
several manufacturers to greatly simplify the design process. The external sync clock provides
direct and precise control of the output ripple frequency for consistent filtering or frequency
The LM2670 series also has built-in thermal shutdown, current limiting and an ON/OFF
control input that can power down the regulator to a low 50-µA quiescent current
standby condition. The output voltage is ensured to a ±2% tolerance.
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