Micrel Semi Intros MIC2287/MIC2289 Converters

Micrel Semiconductor Inc. (San Jose, CA), a leader in power management and high-speed communications integrated circuits, released two new small-sized, dc-dc boost converters, the MIC2287 and MIC2289, which are optimized for driving white LEDs in cellular, personal digital assistant, GPS, digital still camera and camcorder applications.

The MIC2289 offers a small, total-size, pulse-width modultion, dc-dc boost solution, and is available in a 2 mm x 2 mm, MLF-8L package. The MIC2289 requires only four external components to provide a complete white LED driver solution. The low component count is achieved by integrating the external Schottky diode normally required with boost regulators.

The MIC2287 is similar to the MIC2289, except that it operates with an external Schottky diode. The MIC2287 is best suited for higher-power applications that would benefit by sharing the integrated circuit power dissipation with an external Schottky diode. The MIC2287 is available in a 2 mm x 2 mm, MLF-8L package, as well as a low-profile, thin SOT23-5L package.

Both devices operate with a 2.5 V to 10 V input-voltage range, making them suitable for one-cell and two-cell, lithium-ion applications. The output voltage achieves up to 34 V, allowing the MIC2287/9 to power up to eight white LEDs in series. The devices have a high 500 mA switch current rating, allowing them to provide the higher current necessary in applications such as camera flash LED drivers.

The MIC2287 is available in 2 mm x 2 mm MLF-8L and thin SOT23-5L package options. The device is priced at $1.06 and $1.13 in 1,000-piece quantities, respectively. The MIC2289 is available in the 2 mm x 2 mm MLF-8L package. The device is priced at $1.22 in 1,000-piece quantities. Samples are available from stock, and production quantities are stock to 12 weeks ARO.