- Up to 92% conversion efficiency
- Easy-to-use design (using off-the-shelf external components)
- 120mΩ DMOS output switch
- Fixed output and adjustable (1.2V to 37V) versions of 3.3V, 5V and 12V
- When the standby current of 50μA is off,
- 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
- Operating junction temperature range from -40 to +125 °C
illustrate
The LM2678 series of regulators are monolithic integrated circuits that provide step-down switching regulators capable of driving excellent line and load regulation characteristics with 5A loads (buck) all the positive functions. 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. The LM2678 series for a standard inductor is available from several manufacturers, greatly simplifying the design process.
The LM2678 series also features built-in thermal shutdown, current limiting, an ON/OFF control input, and can adjust standby with a low quiescent current power of 50μA up and down. The output voltage is guaranteed to a tolerance of ± 2%. The clock frequency is controlled to a tolerance of 11% ±.
apply
- Simple design, high efficiency (> 90%), step-down switching regulator
- Efficient system pre-regulator linear regulator
- Battery charger
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