LM2673T-3.3

• Up to 94% efficiency
• Easy-to-use design (using off-the-shelf external components)
• The resistor can be programmed to limit peak current from 2A to 5A.
• 150mΩ DMOS output switch
• Fixed output and adjustable (1.2V to 37V) versions of 3.3V, 5V and 12V
• Up to ± 2% output tolerance and load conditions across the line
• Wide 8V to 40V Input Voltage Range:
• Internal oscillator at fixed frequency at 260 kHz
• Soft-start capability
• Operating junction temperature range from -40 to +125 °C

illustrate

The LM2673 series of regulators are monolithic integrated circuits that are buck (buck) switching regulators capable of driving loads up to 3A with excellent line and load regulation characteristics. High efficiency (> 90%) is obtained by using a low on-resistance DMOS power switch. The series includes fixed output voltage and adjustable output versions of 3.3V, 5V and 12V.

THE SIMPLE SWITCHER CONCEPT PROVIDES A COMPLETE DESIGN USING A MINIMUM NUMBER OF EXTERNAL COMPONENTS. A higher fixed-frequency oscillator (260KHz) allows the use of smaller components. A family of standard inductors is supplied with LM2673 manufacturers, greatly simplifying the design process.

Other features include the addition of a soft-start sequencing capacitor to step on the regulator's ability to reduce input inrush current at power-up. The LM2673 series also features built-in thermal shutdown and resistor-programmable current limit protection devices and power MOSFET switches during load circuit fault conditions. The output voltage is guaranteed to a tolerance of ± 2%. The clock frequency is controlled to a tolerance of 11% ±.

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• Simple design, high efficiency (> 90%), step-down switching regulator
• Efficient system pre-regulator linear regulator
• Battery charger