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Catalyst again quickly introduced the three-channel CAT3643 and the four-channel CAT3644 Quad-Mode â„¢ fractional charge pump to take LED driver performance to a whole new level. Among them, the CAT3643 Quad-Mode â„¢ charge pump is the smallest and most efficient charge pump in the world. It is packaged in a 2.5mm x 2.5mm XQFN package with a thickness of 0.4mm and is more efficient than an ordinary charge with only three modes Pump increased by 10%. Only two months after the introduction of the groundbreaking Quad-Mode technology that drives six LED drivers, the CAT3636, Catalyst introduces the latest CAT3643, which can drive up to three LEDs. Thanks to the Quad-Mode architecture, the newly released CAT3643 and CAT3644 deliver up to 92% efficiency while saving board space and costs. The CAT3643 is currently the only charge-pump product in the XQFN miniature 2.5mm * 2.5mm, 0.4mm package, compared to the 0.8mm-high, 3mm x 3mm 16-pin TQFN package of traditional triple-mode charge pumps. Catalyst Semiconductor's innovative and patent-pending Quad-Mode charge pump architecture delivers the same high efficiency as inductive LED drivers while avoiding the problems of over-thickness and EMI interference with the inductor. Most current charge pump LED drivers provide three modes of operation based on the ratio of output voltage to input voltage: 1x, 1.5x and 2x. Quad-Mode architecture adds a fourth mode of operation - 1.33x and eliminates the need for additional capacitors, which is a reduction of at least two pins compared to 1.33x the rest of the company, allowing the device to be small and extremely small Pin XQFN package. The 1.33x mode of operation also effectively reduces the input switch current on the battery side, minimizing the system's input noise, which is an important factor in portable devices such as cell phones. In addition, the 1.33x mode of operation allows the output of the boost voltage as small as possible, which greatly reduces the device's useless power consumption and subsequent heat loss. Thanks to the smaller pin count XQFN package and high efficiency, the CAT3643 is the thinnest (only 0.4mm thick), fractional, fractional charge product (65% smaller than conventional products) in the world today. Using Catalyst's single-wire EZDim LED current programming interface with the triple-mode charge pump, the CAT3643 provides the flexibility to control LEDs and achieve brightness control. The EZDim LED current programming interface offers six different current ratio adjustments. Introduced in conjunction with the CAT3643, the CAT3644 is a quad-mode quad-mode chip that can drive up to 4 LEDs with up to 92% efficiency. CAT3643 and CAT3644 Product Features Quad-Mode â„¢ Switching Architecture for Patent Applications 4th Charge Pump Mode, 1.33x Step-Up Mode Requires Only Two Flying Capacitors for Up to 92% Efficiency Power LED Number CAT3643: Up to 3 CAT3644: Up to 4 Single Wire EZDim â„¢ LED Current Programming Interfaces Package: CAT3643: XQFN, 2.5mm x 2.5mm (0.4mm Thickness), 12-Pin TQFN, 3mm x 3mm (0.8mm Thickness), 12-Pin TQFN, 3mm x 3mm (0.8mm Thickness), 16-Pin CAT3644: TQFN, 3mm x 3mm (0.8mm Thickness), 16-Pin
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