- Up to 96% conversion efficiency
- Available in SO-8 packages, 8-pin DIP and LLP packages
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Computer design software The LM267X makes it simple (Version 6.0)
- Simple and easy to use design with
- Only 5 external components are required
- Use off-the-shelf standard inductors
- 3.3V, 5.0V, 12V and adjustable output versions
- Adjustable version output voltage range from 1.21V to 37V
- ± 1.5% maximum output exceeds line voltage tolerance and load conditions
- 500mA output load current is guaranteed
- 0.25Ω DMOS output switch
- Wide 8V to 40V Input Voltage Range:
- Internal oscillator at fixed frequency at 260 kHz
- TTL shutdown capability, low-power standby mode
- Thermal shutdown and current limit protection
illustrate
La serie LM2674 de reguladores son circuitos integrados monolíticos con un proceso LMDMOS incorporado. Estos reguladores proporcionan a todos los reguladores de conmutación buck (buck) una excelente regulación de línea y carga a 500 mA con función positiva de corriente de carga. Estos dispositivos están disponibles en voltajes de salida fijos de 3.3V, 5.0V, 12V, versiones de salida ajustables.
Al requerir un número mínimo de componentes externos, estos reguladores son fáciles de usar, incluida la compensación de frecuencia interna patentada (5382918 y 5514947 patentada) y osciladores de frecuencia fija.
La serie LM2674 conmuta en una operación de frecuencia 260 kHz This allows for a small size ratio with the lower frequency switching regulator required for the filter assembly. Due to its very high efficiency (> 90%), copper traces of the printed circuit board are the only heat dissipation required.
Un inductor estándar LM2674 de uso doméstico está disponible de varios fabricantes diferentes. This feature greatly simplifies the design of switching power supplies using these advanced integrated circuit supplies. Also included in the datasheet is a guide to selecting diodes and capacitors designed to operate in switch-mode power supplies.
Other features include a guaranteed tolerance of 1.5% of the output voltage specified in the ± and output load conditions for the input voltage and output load conditions, and a ± 10% of the oscillator frequency. External shutdown with a typical standby current of 50μA. The output switch includes current limit, thermal shutdown, and full protection during fault conditions.
Para simplificar el proceso de diseño del regulador reductor LM2674, existe un software de diseño informático, The LM267X makes it simple (Version 6.0).
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