Topic: Technology
Maxim Integrated Products has introduced the MAX8647 negative charge pump. This negative charge pump architecture eliminates line impedance from the battery to the LED. When the battery is discharged, the circuit delays mode switching between 1 and 1.5 times the voltage. The proprietary adaptive mode switching technology independently controls six white or RGB LEDs. Therefore, even with a large mismatch in LED forward voltage drop (VF), the MAX8647 can still achieve a significant 12% increase in efficiency.
The MAX8647/8648 are available in a tiny 16-pin TQFN package (3mm x 3mm, filial 0.8mm high, maximum). The device operates over the extended temperature range of -40°C to +85°C. An evaluation board (MAX8648EVKIT) is available to speed up the design process.
Maxim Integrated Products has introduced the MAX8647 negative charge pump. This negative charge pump architecture eliminates line impedance from the battery to the LED. When the battery is discharged, the circuit delays mode switching between 1 and 1.5 times the voltage. The proprietary adaptive mode switching technology independently controls six white or RGB LEDs. Therefore, even with a large mismatch in LED forward voltage drop (VF), the MAX8647 can still achieve a significant 12% increase in efficiency.
The MAX8647/8648 are available in a tiny 16-pin TQFN package (3mm x 3mm, filial 0.8mm high, maximum). The device operates over the extended temperature range of -40°C to +85°C. An evaluation board (MAX8648EVKIT) is available to speed up the design process.
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