Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8645X/MAX8645Y miniature white-LED drivers
Edited by the Electronicstalk Editorial
Team on 12 April 2007
Miniature LED drivers for use in flip
phones
The MAX8645X/MAX8645Y are miniature white-LED drivers, suitable for use in flip, folder, and slide-style cell phones in which the LCD and camera module are located in the upper half of the phone.
Maxim Integrated Products' MAX8645X/MAX8645Y are miniature white-LED (WLED) drivers with two built-in LDOs for camera supply These charge pumps reduce total required area by 40% by integrating white-LED (backlight) drivers, camera-flash drivers, and camera power supplies into a single IC
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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These devices are suitable for flip, folder, and slide-style cell phones and smart phones in which the liquid-crystal display (LCD) and camera module are located in the upper half of the phone, and space is at a premium.
The MAX8645X/MAX8645Y integrate two programmable 200mA LDOs for powering the camera module.
These LDOs have low-noise (40uV RMS, typ) performance to ensure a clean, stable power source during image acquisition.
This is particularly important for minimising picture noise with the high-resolution cameras typically used in current and next-generation cell phones.
Two control pins allow for the selection of nine different output-voltage combinations, which simplifies ordering and stocking requirements.
The use of a charge-pump regulator enables the thinnest of designs, as no inductor is required.
The MAX8645X/MAX8645Y provide 1MHz fixed-frequency switching, which allows for tiny external components and further reduces total solution size.
These devices drive six WLEDs at 30mA/LED with 5bit dimming resolution and 0.2% (typ) current matching; they also drive two flash LEDs at 200mA/LED with 5bit resolution.
Dimming control can be accomplished using either a simple 2bit logic interface, or, for finer resolution, the logic pins can be connected together and used as a serial-pulse interface.
Other features include soft-start to reduce in-rush current and a proprietary thermal-derating function, which protects the LEDs by scaling back the drive current at high operating temperatures.
The MAX8645X/MAX8645Y are available in tiny, 4 x 4 x 0.8mm TDFN packages, and they are fully specified over the extended temperature range (-40 to +85C).
Prices start at US $2.81 (1000-up).
An evaluation kit is available to speed designs.
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