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FAN5617 Folha de dados(PDF) 1 Page - Fairchild Semiconductor |
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FAN5617 Folha de dados(HTML) 1 Page - Fairchild Semiconductor |
1 / 10 page April 2007 © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5617 Rev. 1.0.1 FAN5617 High-Efficiency, Constant-Current LED Driver with TinyWire™ Brightness Control Features Three-Channel Parallel LED Driver for a Large Range of Forward Voltages TinyWire™ Single-Wire Digital Brightness Control 32 Static Brightness Levels with 5-Bit Internal DAC Adaptive VOUT Adjustment to the Highest Diode Forward Voltage Matched LED Currents; Matched or Unmatched LEDs Built-in Charge Pump with Three Modes of Operation: 1x (linear), 1.5x, and 2x Up to 90% Efficiency Low EMI, Low Ripple Up to 90mA Total Output Current Drives up to Three LEDs at 30mA Each External Resistor Sets Maximum (100%) LED Current 2.7V to 5.5V Input Voltage Range 1MHz Operating Frequency Shutdown Isolates Output from Input, Typically <1µA Protections: Short-Circuit; Soft-Start Limits Inrush Current Minimal External Components Required 3x3mm 16-Lead MLP Package Applications Portable Handheld Backlight PDAs, DVD players, Pagers, Camcorder Backlights Portable Medical Diagnostic Equipments Display MP3 Player Displays Digital Still Camera Backlight Description The FAN5617 is a low-ripple, low-EMI, high-efficiency, constant-current LED driver that drives three LEDs in parallel. The LED brightness control is programmable through Fairchild’s proprietary single-wire digital interface, TinyWire™. The charge pump DC/DC converter operates in three modes: 1X, 1.5X, and 2X over the entire input voltage range of 2.7V to 5.5V. The adaptive nature of the built-in charge pump eliminates the need for LED pre-selection (matching) and delivers high output efficiency. FAN5617 is capable of driving up to 90mA total output current, 30mA per channel. The driver’s built-in, proprietary auto-sense circuit ensures the same efficiency regardless of the number of LEDs connected. When the input voltage is insufficient to sustain the LEDs programmable current level, the FAN5617 reconfigures itself to operate as a linear regulator and the charge pump circuit turns off. The FAN5617 features Fairchild’s TinyWire™ single- wire digital interface for LED brightness control. The built-in 5-bit DAC provides selection of 32 dimming levels, where each level is a percentage of the maximum LED current set by the external resistor, RSET. The FAN5617 includes shutdown, short-circuit, and thermal protection circuitry. Minimal external components are required: two bucket capacitors (2µF and 1µF), a 4.7µF input capacitor, and a 1µF output capacitor are needed for proper operation. The FAN5617 is available in a 3x3mm, 16-lead, molded leadless package (MLP). Ordering Information Part Number Pb-Free Operating Temperature Range Package Packing Method FAN5617MPX Yes 0°C to 85°C MLP-16 3x3mm Tape and Reel TinyWire™ is a trademark of Fairchild Semiconductor Corporation. |
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