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Two-string HB LED driver targets automotive apps

Posted: 04 Feb 2010     Print Version  Bookmark and Share

Keywords:LED driver  LCD  automotive 

MAX16838 HD LED driver

Maxim Integrated's MAX16838 two-string HB LED drivers is able to optimise conversion efficiency and provide complete fault protection and allow a 5000:1 dimming range.

The device integrates a boost or SEPIC switching converter, two linear current sinks, and all necessary power MOSFETs. The MAX16838 is able to optimise conversion efficiency, provide complete fault protection, and allow a 5000:1 dimming range without any external components. The HB LED driver is well-suited for LCD backlighting applications, particularly in automotive displays.

The MAX16838 optimises conversion efficiency by automatically adjusting the switching converter's output voltage to the voltage supply required by the LEDs. A patent-pending architecture allows the device to dim LEDs over a very wide 5000:1 range at 200Hz, while its 200kHz to 2MHz switching frequency can be synchronised to an external clock for improved EMC performance. Additionally, the MAX16838 includes a complete set of protections including LED fault, over-temperature, and over-voltage. If an LED fails open or short, the driver automatically disables the affected string while keeping the others working, thus improving system reliability.

Capable of delivering up to 150mA per string, the MAX16838 operates over the -40°C to +125°C automotive temperature range and accepts a wide, 4.75V to 40V input range. It is available in thermally enhanced, 4mm x 4mm, 20-pin TQFN and TSSOP packages. Prices start at Rs.66.96 ($1.45) (1000-up, FOB USA).

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