Maxim Integrated Products introduces the MAX14515, a DC-to-AC liquid lens driver for autofocus (AF) camera modules. The MAX14515 features a high-voltage differential output controlled through an I2C interface. It employs a charge-pump topology to reduce the number of external components typically used for autofocus drivers in camera modules. The I2C interface and the charge-pump topology are combined in a tiny 2mm x 1mm WLP, making the MAX14515 the industry's smallest liquid lens driver. The device is ideal for tiny cell-phone camera modules that use the newest autofocus technologies.
TRADITIONAL SOLUTIONS TOO LARGE FOR SHRINKING CAMERA MODULES
The traditional liquid lens drivers available on the market require components typically found in boost topologies, which minimally include a large inductor, diode, and high-voltage capacitor. Meanwhile, other charge-pump-based drivers are large and require many capacitors. When the numerous other supporting discrete components are added to the design, the size of these discrete solutions requires a large footprint, one that can no longer be accommodated inside the shrinking autofocus camera modules.
HIGH INTEGRATION AND HIGH PERFORMANCE FOR TINY CAMERA MODULES
The MAX14515 needs at most two small external capacitors: one low-voltage capacitor and a tiny bypass capacitor. The device integrates an 8-bit monotonic DAC with a single-differential high-voltage output controlled by a 2-wire I2C interface to set the amplitude. The high-voltage output delivers up to 42Vrms into a 200pF liquid lens load at 1.1kHz.With its 2mm^2 footprint, which is at least 60% smaller than the market's available drivers, the MAX14515 liquid lens driver easily fits inside the camera module. The unique combination of smallest footprint, I2C interface, and low shutdown current make the MAX14515 ideal for enabling today's newest high-performance, autofocus camera modules.
Maxim Integrated Products, www.maxim-ic.com.
