Linear Technology presentó a través de Mouser Electronics en el enlace https://www.mouser.com/pdfdocs/Linear_LDO_2014brochure_10_163.pdf  un folleto en el que sus soluciones para reguladores lineales con baja caída de tensión (LDO) se abordan de forma amplia. Son 16 páginas con componentes, características y muy circuitos prácticos. Si el lector suele utilizar este tipo de componente en sus proyectos y requiere soluciones de alto rendimiento, sugerimos que baja el folleto y mantenga en su biblioteca. En este artículo hablamos un poco de los circuitos encontrados.

    Linear Technology, cuyos productos son distribuidos por Mouser Electronics, ofrece una amplia gama de LDOs, reguladores lineales de tensión con características de baja caída de tensión en la conducción.

   Esta línea tiene desde componentes de alta tensión, reguladores simples, controladores y fuentes de corrientes, todos abordados en esta documentación.

   Hemos escogido algunos circuitos como ejemplo, dando una idea de lo que el lector puede obtener en la documentación completa.

 

Regulador lineal de 50 mA con tensión de 3 V a 80 V

    Este circuito tiene una caída de tensión máxima de 300 mV (corriente de 50 mA) y hace uso del regulador de tensión integrado LT3011 de Linear. (figura 1)

 

Figura 1
Figura 1

 

   

Regulador de 250 mA con entrada de 4 V a 80 V

   La base de este circuito es el regulador LT3013 de Linear con una salida de 5 V con una corriente máxima de 250 mA. La caída de tensión máxima es de 400 mV. El circuito se muestra en la figura 2.

 

Figura 2
Figura 2

 

  

Regulador Rail to Rail de 1,5 A

   El circuito mostrado en la figura 3 tiene como base el regulador LT3066 usando transistor PNP. El circuito tiene una compensación para caída de tensión en el cable y su salida es de 5 V. En el datasheet de este componente, que puede obtenerse en el sitio de Mouser más información sobre este circuito se pueden obtener, así como en el propio documento que sugerimos que lector descargar. El circuito se muestra en la figura 3.

 

Figura 3
Figura 3

 

   

Regulador de micropotencia de 20 mA

   En la figura 4 tenemos un circuito de micropotencia con sólo 3 uA de corriente quiescente. La entrada de este circuito puede variar entre 3,8 V y 45 V y la corriente máxima es de 20 mA para una salida de 3,3 V. El circuito integrado utilizado es el LT3007-3.3 de Linear.

 

Figura 4
Figura 4

 

  

Regulador doble de 750 mA y 250 mA con el LT3030

   El circuito de la figura 5, sugerido por Linear utiliza como base el LDO LT3030 doble, proporcionando salidas de 1,8 y 1,8 V con corrientes de 750 mA y 250 mA respectivamente. La caída de tensión es baja.

 

Figura 5
Figura 5

 

  

Regulador simétrico de 5 V con 150 mA

   La base del circuito mostrado en la figura 6 es el regulador de baja caída de tensión (LDO) LT3032 de Linear. La corriente máxima es de 150 mA y la tensión de salida doble es de 5 V. El circuito tiene bajo ruido, indicado en el diagrama y la tensión de entrada puede oscilar entre 5,4 V y 20 V.

 

Figura 6
Figura 6

 

   

Regulador con tensión ajustada por 1 resistor

   El circuito mostrado en la figura 7 es sugerido por Linear en su documentación del circuito integrado LT3083. La corriente máxima de salida es de 3 A y la tensión de salida de 0,9 V.

 

Figura 7
Figura 7

 

 

Regulador de alta corriente con respuesta rápida LT1584

   El circuito mostrado en la figura 8 es sugerido por Linear Technology haciendo uso del LT1584 y otros equivalentes según la tensión de salida deseada. El circuito tiene una baja caída de tensión (LDO) y una respuesta positiva rápida que puede operar en el modo ajustable.

 

Figura 8
Figura 8

 

  

Regulador Negativo 600 mA con el LT3090

   En la figura 9 tenemos un regulador que proporciona tensión negativa de -2,5 V bajo corriente de hasta 600 mA a partir de entrada de -3 a -10 V. El circuito tiene una entrada para limitación programada de corriente.

 

Figura 9
Figura 9

 

 

 

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