Product Overview

California Micro Devices introduces FlexBoost™, a breakthrough power saving technology forming a new family of inductor boost WLED drivers as part of CMD's growing PhotonIC™ portfolio of LED drivers. These innovative products enable display designers to drive several strings of WLEDs off a single chip using a single inductor and outputting the appropriate voltage on each channel. This technology is unique, and products based on FlexBoost™ feature unique differentiation from system efficiency and power consumption standpoints. CMD’s FlexBoost™ architecture can improve efficiency by up to 40 percent when driving backlight displays from a single WLED driver solution.
California Micro Devices’ PhotonIC™ product portfolio now includes four inductor boost products (CM93xx) based on FlexBoost™. These products feature analog control interfaces and the capability of driving several strings of WLEDs, most likely asymmetrical, as well as an OLED display in the most efficient manner in a compact footprint. Using one of these products allows wireless handset designers to significantly extend battery life at the lowest bill of materials in the smallest footprint.

Product Features
The CM93xx family consists of four inductor boost products based on FlexBoost™ technology. Their respective driving capabilities are summarized in the following table:

Product	Driving Capabilities
CM9330	Three (asymmetrical) strings of WLEDs with FlexBoost™ using single inductor
CM9321	Two (asymmetrical) strings of WLEDs + One channel for OLED panel with FlexBoost™ using single inductor
CM9320	Two (asymmetrical) strings of WLEDs with FlexBoost™ using single inductor
CM9311	One string of WLEDs + One channel for OLED panel with FlexBoost™ using single inductor

Each of the products can operate with input voltages ranging from 2.7V to 6V. Current can be set independently for each output using an external resistor or can be controlled by an analog voltage and PWM input. The output voltage and current ripple are less than 1 percent. They operate at a 1MHz switching frequency, allowing the use of a smaller inductor, and feature input undervoltage lockout and output overvoltage protection.

FlexBoost™ Benefits
The CM93xx family utilizes the breakthrough FlexBoost™ technology that allows driving multiple asymmetrical WLED strings in the most efficient way. Unlike existing boost WLED drivers, products based on FlexBoost™ technology can supply the appropriate voltage to each string instead of the highest voltage to all strings. A typical example is using the CM9330 to drive one string for the main display backlight with up to five WLEDs, a second string for three WLEDs and a third output for a single WLED. The required voltages in this case are 18V, 11.2V and 4.2V, respectively. Instead of supplying 18V to all channels, the CM9321 supplies the appropriate voltage to each string, resulting in a significant increase in efficiency.

Applications and Deliverables
This product family is a perfect fit to drive backlight, keypad and camera flash LED sub systems in the most efficient way by leveraging FlexBoost™ technology in a compact footprint and at the lowest bill of materials cost. Reference design kits are available to customers to allow a rapid evaluation of the advantages and benefits of this product portfolio.

Sampling, Pricing and Availability
The CM9330 and CM9321 are housed in a low profile QFN16 package, and the CM9320 and CM9311 in a 3mm x 3mm DFN10. All of the products described are currently sampling and reference design kits are available. Pricing ranges from $1.20 to $1.60 in 1,000 unit quantities. Production is scheduled for Q2 2006.