AS3665 Smartlight LED Driver

ams' AS3665 9-channel advanced command driven RGB/white LED driver

Image of AMS' AS3665 Smartlight LED DriverThe ams AS3665 is a capacitive low noise charge pump with 9 current sources. The charge pump automatically switches between 1:1 and 1:1.5 modes. The connected current sources have a very low voltage compliance to improve the efficiency of the entire system. Three current sources have the possibility to operate either from VBAT or VCP (especially useful for red LEDs).

The internal control is done by command based pattern generators implemented by three sequencers. These commands are optimized for lighting applications (e.g. to ramp up brightness logarithmically). It includes high level commands including conditionals, jumps, and variables.

Any of the three sequencers can be dynamically mapped to any of the nine PWM generators for the LEDs. The AS3665 supports an audio input and sophisticated light patterns can be controlled by internal digital filters.

The AS3665 is controlled by I²C mode. Synchronization over several AS3665 devices is possible via the TRIG pin. The AS3665 is available in a space-saving WL-CSP-25 (2.5 mm x 2.5 mm) 0.5 mm pitch and operates over the -30°C to +85°C temperature range.

Features and Benefits
  • High efficiency capacitive 150 mA charge pump with 1:1, 1:1.5, and 1:2 modes with automatic mode switching; 1:2 mode can be disabled
  • 9-channel high side 20 mA current sources
    • Less than 50 mV at 10 mA dropout voltage
    • LED 7, 8, and 9 either powered by VBAT or VCP
  • Advanced command based pattern generator
    • 96 x 16 bits program memory
    • Dedicated lighting commands like logarithmic fade
    • Programming control and conditional jumps
  • Audio controlled lighting with internal digital filters
  • I²C interface with dedicated EN pin
  • Available in WL-CSP-25 (2.5 mm x 2.5 mm) 0.5 mm pitch
  • Three sequencers
    • Dynamically mapped to nine PWM generators
    • Internal/external synchronization
  • Nine PWM generators (12-bit resolution)
    • Dynamically mapped to nine PWM generators


ImageManufacturer Part NumberDescriptionTypeTopologyAvailable Quantity
IC LED DRIVER RGLTR DIM 25WLCSPAS3665-ZWLT-500IC LED DRIVER RGLTR DIM 25WLCSPDC DC RegulatorSwitched Capacitor (Charge Pump)47 - Immediate
AS3665-ZWLT-500 product page link
Published: 2013-07-02