LM2670 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
August 1998
LM2670 SIMPLE SWITCHER ® H...
LM2670 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage
Regulator with Sync
August 1998
LM2670 SIMPLE SWITCHER ® High Efficiency 3A Step-Down Voltage
Regulator with Sync
General Description
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 3A 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 3.3V, 5V and 12V and an adjustable 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 (260KHz) or from an externally provided clock in the range of 280KHz to 400Khz 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 spectrum positioning. 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 50µA quiescent current standby condition. The output voltage is guaranteed to a ± 2% tolerance.
Feature...