White light driver

Micrel’s new white LED drivers target applications where LEDs provide LCD backlighting in colour display applications such as cellular phones, PDAs, and digital cameras.

Micrel’s MIC2292 and MIC2293 1.6MHz and 2MHz Pulse Width Modulated (PWM) DC/DC white LED drivers target applications where LEDs provide LCD backlighting in colour display applications such as cellular phones, PDAs, and digital cameras.

Only four external components are required to design a complete white LED driver solution – a tiny ceramic input and output capacitor, a small size inductor, and a tiny resistor to set the LED current level.

‘The newly available 1.6MHz and 2MHz high frequency options, featuring an internal Schottky diode, allow designers to minimise size and noise within a system while achieving up to 30% higher efficiency over charge pump based solutions,’ said Tony Grizelj, Micrel’s marketing manager for power products.

Built on Micrel’s proprietary in-house fabrication process, the devices also feature an internal 34V switch that can handle more than 0.5A of current. The high voltage and high power capabilities allow the devices to light three to six series LEDs powered from a LiIon battery.

The devices also sport internal current limit, thermal shutdown, and output over voltage protection, and are available in 2mm x 2mm MLF-8L packaging.

The chips are currently sampling with volume quantities available within 12 weeks. Chip pricing starts at $1.25 in 1K quantity. Lead-free packaging is also available.