Maxim launches high efficiency high brightness LED driver

Maxim launched MAX16819/MAX16820, LED drive, for driving high brightness light-emitting diode (HB LED), suitable for construction, industrial and automotive lighting applications. MAX16819/MAX16820 HB LED driver requires only a few external MOSFET and passive devices to drive up to 3A current LED. Each device can drive up to 6 series LED, from 1W to 25W above the output power, efficiency of up to 94%. The device uses a miniature 3mm x TDFN package with the smallest size in the same device as the 3mm. At the same time, high voltage current sense amplifiers and switching frequencies up to 2MHz can further reduce the number of space and component requirements. This series of highly integrated devices, can greatly reduce the power consumption and improve reliability, but also reduce the production cost, is ideal for MR16 LED (instead of the traditional MR16 halogen lamp light source) and automobile front and rear lights (RCL, DRL and fog). Unlike the general buck control architecture that drives the HB LED, the MAX16819/MAX16820 driver uses hysteresis control. Using this drive control technology, can ensure the fast transient period during the PWM dimming response and fast on-off control, PWM dimming technology to achieve a wide dimming range by special DIM input (up to 5000:1) or high dimming switch frequency (up to 20kHz). Hysteresis control has a high input power rejection ratio, and can quickly respond to LED dimming. The device does not need to control the loop compensation, simplifies the design and reduces the number of components.

The wide input voltage range MAX16819/MAX16820 (4.5V to 28V) of the device is optimized and can be used for buildings, lighting and other different input voltage standard equipment, and meet the cold start and load rejection requirements for automotive applications. The series LED driver operates from -40 C to +125 DEG C automotive temperature range using a miniature, 3mm x 3mm, 6 lead TDFN package with a bare pad. The price of the device is $0.58 (1000 chips, us FOB).