LM2670

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Input Supply Voltage ...............................................45V
ON/OFF Pin Voltage .....................................−0.1V to 6V
Switch Voltage to Ground .............................−1V to VIN
Boost Pin Voltage ...........................................VSW + 8V
Feedback Pin Voltage ................................−0.3V to 14V
Power Dissipation Internally Limited
ESD (Note 2) ............................................................2 kV
Storage Temperature Range............... −65°C to 150°C
Soldering Temperature
       Wave ..................................................4 sec, 260°C
       Infrared ............................................10 sec, 240°C
       Vapor Phase .....................................75 sec, 219°C

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 50A quiescent current standby condition. The output voltage is guaranteed to a ±2% tolerance.