Pompe de charge fractionnée 1,5X fractionnaire haute efficacité pour applications à LED blanches

Numéro de référence fabricant :


Fabricant Skyworks


Description :

The AAT3194 is a low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low external parts count (two 1μF flying capacitors and two small bypass capacitors at IN and OUT) makes these devices ideally suited for small, battery-powered applications. Skyworks' Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. The AAT3194 has a thermal management system for protection in the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high switching frequency enables the use of small external capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3194 is available in a Pb-free 12-pin TSOPJW package.

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    • VIN Range: 2.7V to 5.5V
    • 20mA Full-Scale Current
    • Simple Serial Control (S2Cwire) Interface
    • 32-Position Logarithmic Scale with Digital Control
    • Low Noise Constant Frequency Operation
    • 33% Less Input Current Than Doubler Charge Pump
    • High Accuracy Brightness Matching
    • Small Application Circuit
    • Regulated Output Current
    • Automatic Soft Start
    • No Inductors
    • 600kHz Switching Frequency
    • IQ <1μA in Shutdown
    • Temperature Range: -40°C to 85°C
    • 12-Pin TSOPJW Package

    How wireless works

Caractéristiques Produits similaires
Courant Actif O/P Typ (µA) 20  

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Tension de Sortie (V) 4.2  
Courant au Repos Typ. (µA) < 1  
Gamme de Tension d'entrée (V) 2.7 to 5.5  
Type de Composant Regulated  
Température de Fonctionnement (°C) -40 to +85  
Boîtier TSOPJW-12