AnalogicTech Debuts Six-Channel Backlight Charge Pump With Flash Capability

Advanced Analogic
Technologies Incorporated (AnalogicTech) (Nasdaq: AATI), a developer of power
management semiconductors for mobile consumer electronic devices, today
introduced the AAT2803, a multi-function, high efficiency, dual charge pump
that supports both white LED backlight and camera flash applications for
portable systems that run on lithium-ion/polymer batteries. The device offers
independent control of three separate LED banks (two for backlight and one for
camera flash) and features seven channels total (six for backlight and one for
camera flash). The AAT2803 delivers major power and space savings for handsets
featuring two displays, and adds a light load mode to minimize power
consumption when the handset display is active in standby mode.
(Logo: http://www.newscom.com/cgi-bin/prnh/20050829/SFTU089LOGO )
"Most of today's handsets feature two displays, either in a clamshell
design with a main display on the inside and a secondary display on the
outside or in a bar design with a main display and a keypad backlight," said
Kin Shum, Director of Strategic Marketing at AnalogicTech. "By combining
independent control of two separate banks of backlight LEDs with flash
capability and a light load mode in a single device, the AAT2803 charge pump
helps designers minimize power consumption while reducing component count and
package size."

Maximum Efficiency
The backlight charge pump is capable of driving up to six LEDs at a total
of 180mA. The device provides independent control of two groups of four and
two LEDs to backlight a primary and secondary display. The outputs can be
operated independently or in parallel.
The AAT2803 uses AnalogicTech's AS2Cwire(TM) (Advanced Simple Serial
Control(TM)) digital interface to enable, disable, and set current for each
backlight LED across a 16-level logarithmic scale. Four low-current settings
allow operation in light load mode down to 50uA (typical).
The backlight charge pump maximizes power efficiency by operating in 1X,
1.5X, and 2X modes. The mode of operation is automatically selected by
comparing the forward voltage of each LED with the input voltage. Optimized
current sinks minimize the voltage headroom required to drive each LED and
maximize power efficiency by increasing the amount of time the devices stays
in 1X mode before transitioning to 1.5X mode.
Unlike most of the integrated solutions available today, the AAT2803 uses
a dedicated charge pump to drive the backlight. As a result, backlight
operation is not affected by the photo flash, which is driven by a separate
charge pump engine.

Flash Function
For flash applications, the device integrates a charge pump with a
regulated output voltage. Delivering up to 120mA of continuous current or up
to 300mA of pulsed current, the circuit adds an independent enable pin to
maximize system flexibility.
The AAT2803 features built-in thermal protection, an integrated
auto-disable capability for load short-circuit conditions, and soft-start
circuitry to prevent excessive in-rush current during startup. The use of a
1MHz constant switching frequency allows designers to support the device with
extremely small ceramic capacitors.

Price and Availability
The AAT2803 is available in a Pb-free, thermally-enhanced, 24-pin QFN44
package and is rated over the -40 to +85 deg C temperature range. The device
sells for $1.97 in 1,000-piece quantities.

About AnalogicTech
Advanced Analogic Technologies Incorporated (AnalogicTech) is a supplier
of power management semiconductors for mobile consumer electronic devices,
such as wireless handsets, notebook and tablet computers, smartphones, digital
cameras, and digital audio players. The company focuses its design and
marketing efforts on the application-specific power management needs of
consumer, communications, and computing applications in these rapidly evolving
devices. AnalogicTech is headquartered in Sunnyvale, California, with offices
in Beijing, Hong Kong, Japan, Shanghai, Shenzhen, South Korea, Sweden, and
Taiwan, as well as a worldwide network of sales representatives and
distributors. For more information, please visit the AnalogicTech website:
http://www.analogictech.com. (AnalogicTech - G)

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