Maxim
Integrated Products has introduced a high-efficiency WLED driver with an
integrated boost converter and five GPIO ports that can be used to drive LEDs
(powered from an alternate power supply) in parallel.
Capable
of driving up to six LEDs in series, the MAX6948B boost converter allows PWM
control of the boost voltage to maximize power efficiency. The
I2C-programmable, 10-bit PWM signal enables 1024 levels of WLED intensity, thus
providing precise control over display brightness. These power-saving features
make the MAX6948B an ideal backlighting solution for portable applications in
which battery life is critical.
To
save space, the boost converter features a 2 MHz switching frequency to
minimize the size and cost of external components. The device can supply up to
30 mA of load current under all conditions.
Additionally,
the five GPIO ports can function as extra logic ports or as constant-current
sink drivers. Capable of accurate current control on parallel LEDs, they
feature multiple levels of constant-current drive and are PWM programmable.
The
ports are ESD protected up to 8 kV HBM to eliminate the need for external
ESD-protection circuitry.
Pricing
The
MAX6948B is fully specified over the -40 to +105 degrees Celsius temperature
range. It is available in 25-bump WLP (wafer-level package). Prices start at
1.70 US Dollars (1000-up, FOB USA).
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