AS3490 Overview
The AS3490 is an inductive highly efficient DCDC boost converter. The DCDC converter operates at a fixed frequency of 2MHz and includes soft startup to allow easy integration into noise sensitive RF systems. A predictable startup is guaranteed even with very low duty cycle PWM input signals.
AS3490 Key Features
- 2 MHz DCDC Boost converter
- Small 4.7µH external coil
- Very high system efficiency of 86% (DCDC and current sources bined)
- Very low voltage changes on output to avoid acoustic noise on output capacitor even with PWM
- Smooth startup even under low duty cycle PWM conditions
- Three Current sources up to 25mA
- Low voltage pliance (150mV)
- High side current source to simplify layout and thermal management of the LEDs
- Automatically detect and disable failing or not used LEDs to keep efficiency high
- Current matching <4%