El circuito integrado TPS7A92 de Texas Instruments consiste en un regulador de tensión lineal de baja caída de tensión (LDO) con bajo nivel de ruido y capacidad de suministrar hasta 2 A de corriente con alta precisión. En este artículo se describen las principales características de este componente.

   Lanzado en julio de 2017, el TPS7A92 de Texas Instruments (disponible en Mouser Electronics en http://www.mouser.com/new/Texas-Instruments/ti- tps7a92-voltage-regulator/) consiste en un regulador lineal de tensión con alta precisión y baja caída de tensión con capacidad de suministrar corrientes hasta 2 A.

   El TPS7A92 tiene tensiones de salida que pueden ajustarse entre 0,8 V y 5,2 V y las tensiones de entrada pueden oscilar entre 1,4 V a 6,5 V.

   El ruido de salida es de sólo 4,6 uVrms (10 Hz - 100 kHz) y el rechazo de fuente es de 60 dB en DC, 40 dB a 100 kHz y 40 dB a 1 MHz.

   En el suministro de corrientes de 2 A a una carga, la caída de tensión es de apenas 180 mV y para el ajuste de la tensión de salida se hace con el uso de sólo dos resistores.

   La precisión del regulador es del 1% para la tensión de salida, y además produce el recurso de soft-start para reducir la corriente de brote.

   El TPS7A92 ha sido especialmente diseñado para alimentar componentes sensibles al ruido, como los usados ??en comunicación de alta velocidad, m vídeo, equipos médicos o de prueba y medición.

   La envoltura es de 10 pines, midiendo sólo 2,5 x 2,5 mm como se muestra en la figura 1.

 

Figura 1 - Envoltura DSK
Figura 1 - Envoltura DSK

 

   Se puede acceder al datasheet completo del TPS7A92 en: http://www.ti.com/lit/ds/symlink/tps7a92.pdf

   Un circuito típico de aplicación para una salida de 1,2 V se muestra en la figura 2, obtenido del propio datasheet del componente.

 

Figura 2
Figura 2

 

   Un gráfico interesante es el mostrado en la figura 3 en que tenemos la caída de tensión en el componente en función de la corriente de salida.

 

Figura 3
Figura 3

 

Varios otros gráficos con las características del componente están disponibles en el datasheet.

 

 

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