MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX1582, the first white LED driver to power up to six white LEDs in series with a constant current.
It provides display backlighting for two displays (the larger main and the smaller sub) in cell phones, eliminating the need for ballast resistors, external switches, and factory calibration to match white LED brightness.
The proprietary dual-segment, step-up converter includes a 30V, low drain-source on-resistance, N-channel MOSFET switch to achieve 84% efficiency and maximum battery life.
The MAX1582 operates at constant 1MHz switching frequency, enabling use of a low-profile inductor and a tiny 0.1 microfarad output capacitor.
Other features include analog or direct-digital PWM brightness control, low 15 milivolt peak-to-peak input ripple, soft-start for zero inrush current, and overvoltage protection to eliminate a zener protection diode.
The MAX1582 is available in space-saving, 12-pin thin QFN (4mm x 4mm) and chip-scale (UCSP(TM)) (2.1mm x 2.1mm x 0.61mm) packages, and is screened for the extended-industrial temperature range (-40°C to +85°C).