Products, Materials + Tools | May 18, 2011

Marvell Introduces Ultra Small DC/DC PWM Buck Driver for Small Footprint PCB and High Design Flexibility

More and more, people are committed to find impactful ways to conserve energy in their homes and businesses. And yet simple solutions, such as LED lighting, have been cost-prohibitive, and thus out of reach for the mainstream consumer. With Marvell's single-chip, unique mixed-signal LED driver architecture, lighting designers can more easily build energy-efficient, superior lighting features and controls into lower cost mainstream professional and consumer products, enabling more widespread adoption of eco-friendly LED lighting.

The 88EM8801 supports a wide range of applications from professional luminares to consumer light bulbs.

Applications:
• Down lights and recessed lights
• PAR lamps including PAR20, PAR30, and PAR38
• A lamps
• MR, AR, and GU lamps
• LED modules

Features:
• Dual-string high efficiency LED driver with synchronous buck topology LEDs for reduced system cost
• Up to 1000 mA LED output current for first string and 500 mA for second string
• Up to 40V input voltage
• Selectable buck switching frequency, within 200kHz and 800kHz range
• Flexible OTP memory configuration capability for compensating the dieto-die light output variation
• 10-bit PWM dimming resolution.
• Up to 0.1% deep dimming capability
• PWM dimming input control
• TWSI (I2C compatible) interface with ZigBee, PLC, WiFi
• Input ripple cancellation
• Soft startup
• Over current protection
• Over temperature protection
• Under voltage lock-out

Benefits:
• Independent LED string current calibration allows using loosely binned
• Independent control of two LED strings enables mixing of red LEDs with cool white or bluish green LEDs to achieve warmer color and higher CRI with higher efficacy
• High efficiency up to 95%
• Digital interface for Networked lighting control
• High integration requires only inductors and few other discrete components for reduced BOM cost and PCB space
• Minimize design effort by built-in intelligence

The 88EM8801 device controls two LED strings using PWM current control. Intelligent digital control allows for 10bit PWM dimming resolution and up to 0.1% deep dimming capability. The incorporated OTP memory block further allows the calibration of each string to its respective target LED current, during the final light fixture manufacturing. As a result, the 88EM8801 device enables the mass production of consistent light output, without using tight, hence expensive, binning LEDs. Moreover, the 88EM8801 device enables high quality light output in terms of warm CCT (correlated color temperature) and high CRI (color rendering index) by mixing red LEDs with cool white LEDs or bluish green LEDs. The 88EM8801 device integrates I2C compatible Two Wire Serial Interface (TWSI) which can connect with different communication units, such as ZigBee®, PLC, Wi-Fi or others, for dimming and on/off control, enabling further energy efficiency through networked lighting control.

For additional information please visit Marvell or download the Marvell 88EM8801 Product Brief

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