- Up to 92% conversion efficiency
- Easy-to-use design (using off-the-shelf external components)
- 100MΩDMOS 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:
- External Synchronous Clock Function (280KHz to 400kHz)
- Internal oscillator at fixed frequency at 260 kHz
- Operating junction temperature range from -40 to +125 °C
illustrate
The LM2677 series of regulators are monolithic integrated circuits that provide buck switching regulators capable of driving all the positive features of a 5A load (buck) with excellent line and load regulation. 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. The clock switching frequency can be provided by an internal fixed frequency oscillator (260KHz) or an externally supplied clock in the range of 280KHz to 400kHz, allowing the use of smaller components. A standard inductor used in the LM2677 series is available from several manufacturers, greatly simplifying the design process. An external synchronous clock provides direct and precise control of output ripple frequencies for consistent filtering or spectral positioning.
The LM2677 series also features built-in thermal shutdown, current limiting, and an ON/OFF control input that can adjust standby with a low quiescent current of 50μA up and down. The output voltage is guaranteed to a tolerance of ± 2%.
apply
- Simple design, high efficiency (> 90%), step-down switching regulator
- Efficient system pre-regulator linear regulator
- Battery charger
- Radio equipment for communication and synchronization of clock frequencies, voltage regulators
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