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CMD expands PhotonIC portfolio

Posted: 10 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:California Micro? CMD? PhotonIC? white LED? CM9130?

California Micro Devices has introduced additions to its PhotonIC portfolio of white LED drivers for wireless handset applications. After its acquisition of Arques Technology in April, CMD announced the integration of a differentiated family of fractional charge pump white LED drivers.

With increased demand for brighter and larger resolution displays, powerful camera flash capabilities for multi-megapixel sensor resolutions, and various types of LEDs to support keypad backlight and multimedia capabilities, wireless handset designers become increasingly concerned with the efficiency of the LED driver subsystem.

CMD'S PhotonIC family of white LED drivers now includes five current regulated fractional charge pump products&emdash;the CM9130, CM9132, CM9133, CM9140 and CM9142&emdash;that can drive up to six white LEDs as well as three voltage regulated products&emdash;the CM9153, CM9156A and CM9156B. These product lines feature a simple analog control interface as well as optimal efficiency in a compact footprint.

Current regulated products
The new regulated fractional charge pumps have the following drive capabilities: the CM9130 has one group of three matched white LEDs; the CM9132 has one group of three matched white LEDs and one group of two matched white LEDs; the CM9133 has one group of three matched white LEDs and one group of three matched white LEDs; the CM9140 has one group of four matched white LEDs; and the CM9142 has one group of four matched white LEDs and one group of two matched white LEDs.

The new products support an input voltage range of 2.9-6V, and feature an adaptive charge pump architecture of 1x and 1.5x (fractional) to achieve optimal efficiency and still be capable of driving up to 50mA on each output with a current matching of 2 percent. CMD explained that such solutions require no external ballast resistor or inductor, thus minimizing the footprint of the complete solution. The company added that designers can significantly reduce EMI by using this architecture.

Each group of LEDs is independently controlled through PWM and analog interfaces. These products operate at a switching frequency of 500kHz and feature over temperature protection, over current protection, and soft start circuit to prevent excessive in-rush current and a low shutdown current. Housed in 4-by-4mm QFP package, these white LED drivers are suitable for display backlights and keypad or camera flash LEDs.

Voltage regulated products
The three voltage regulated products have the following drive capabilities: the CM9153 with up to six white LEDs supports 650kHz; the CM9156A with up to six white LEDs supports four selectable frequencies; and the CM9156B with up to six white LEDs supports two selectable frequencies, DFN10 or MSOP10 packages.

These products feature a fixed output voltage of 4.5V with a low output ripple of less than 1 percent and an accuracy of 2 percent. Both the CM9156A and CM9156B offer selectable switching frequencies to allow further power savings.

The CM9153 is housed in DFN8 or MSOP8, and the CM9156A/B are offered in either DFN10 or MSOP10. These devices also feature OTP, OCP and soft start.

All product lines described are currently sampling and reference design kits are available. Pricing ranges from 60 cents to $1.20 for 1,000-unit quantities. Production is scheduled for Q2 2006.

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