Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8901A/MAX8901B
Edited by the Electronicstalk Editorial Team on 07 September 2007
WLED drivers offer small solution size
Designed to drive two to six WLEDs for backlighting, the MAX8901A/MAX8901B are ideal for the 1.5 to 4-inch LCDs used in battery-operated devices.
Maxim Integrated Products has released the MAX8901A/MAX8901B high-efficiency white-LED (WLED) drivers These devices achieve up to 92% efficiency while driving a string of two to six WLEDs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Designed to drive two to six WLEDs for backlighting, the MAX8901A/MAX8901B are ideal for the 1.5 to 4-inch LCDs used in battery-operated devices such as smartphones, PDAs, portable media players, GPS devices and digital still cameras.
The MAX8901A/MAX8901B provide a single input to enable the IC and to control LED intensity.
With the LED current proportional to the PWM duty cycle, the MAX8901A uses a direct-PWM input to regulate LED intensity.
In contrast, the MAX8901B uses single-wire, serial-pulse dimming that reduces LED intensity in 32 linear steps.
Full-scale LED current for serial-pulse dimming is 24.75mA, and each step is 0.75mA.
In addition to providing flexible dimming control, the MAX8901A/MAX8901B integrate robust protection features: internal soft-start to eliminate inrush currents during startup, input overvoltage protection, LED overvoltage protection, undervoltage lockout, and thermal shutdown.
To conserve battery power, these WLED drivers consume only 0.1uA (typ) in shutdown mode.
The MAX8901A/MAX8901B are available in a space-saving, thermally enhanced, 2 x 2mm, eight-pin TDFN package that is fully specified over the -40C to +85C extended temperature range.
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