The six-channel, high-efficiency CAT3649 Quad-Mode LED driver from On Semiconductor targets smart phones and other consumer handheld applications such as digital still cameras and portable media players. Coupled with Content Adaptive Brightness Control (CABC), the Quad-Mode architecture ensures market-leading efficiency in LED backlighting using only external capacitors, according to the company.

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The CAT3649 has a total of four charge-pump modes (1x, 1.33x, 1.5x, and 2x), while other LED drivers have three. The 1.33x mode increases its efficiency by up to 10% compared to traditional charge-pump LED drivers using 1.5x operation, On Semiconductor says, extending the battery life of the handheld products that incorporate it.

The charge pump supports a wide range of input voltages, from 2.4 to 5.5 V. The LED current can be adjusted by analog dimming in 32 linear increments via the 1-wire interface. Further adjustment can be carried out through pulse-width modulation (PWM). The PWM dimming control is compatible with CABC for PWM PWM signal frequencies from 100 Hz to 200 kHz.

The six-channel, high-efficiency CAT3649 Quad-Mode LED driver from On Semiconductor targets smart phones and other consumer handheld applications such as digital still cameras and portable media players.

The CAT3649 comes in a compact 3.0- by 3.0-mm, lead-free TQFN-16 (thin quad flat no-lead) package. It costs $0.49 each in 100,000-unit quantities.

On Semiconductor