Sunnyvale, Calif. Maxim Integrated Products says its MAX16821 high-power, synchronous high-brightness LED (HB-LED) driver with rapid current pulsing is the first to drive common-anode LEDs. This device is suitable for front-projection, rear-projection TV (RPTV), and pocket projector applications that require very fast LED dimming capabilities.
The MAX16821 operates from 5.4 V to 28 V with a LED current-sense voltage of 0.03 V, providing the lowest dissipation of power. (Other current-sense voltage versions are also available.) The device also offers several unique features including a driver architecture that allows HB-LEDs to be mounted in the common-anode configuration, and a unique pin configuration capability that allows the device to be operated in either synchronous buck or synchronous boost mode for high efficiency operation.
In addition, the wide switching frequency range of 125 kHz to 1.5 MHz allows small inductors and filter capacitors to be used in applications such as pocket projectors where system designers are faced with tight space constraints. For systems requiring multiple drivers, the MAX16821 also features a clock output with 180-degree phase delay that can control a second, out-of-phase LED driver. This feature can be used to minimize LED current ripple, thereby reducing the size and cost of the input and output filter capacitors even further, said Maxim.
Other features include programmable hiccup, over-voltage protection, reverse current limit, and an output-enable function. The MAX16821 operates over the automotive temperature range of -40° to +125° and is available in a lead-free, 5 x 5 x 0.8 mm, 28-pin TQFN package with an exposed pad.
Pricing: Starts at $1.82 (1000-up, FOB USA).
Maxim Integrated Products, 1-800-998-8800, www.maxim-ic.com