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FAN5610 Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor |
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FAN5610 Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor |
1 / 10 page www.fairchildsemi.com REV. 1.0.2 10/28/03 Features • LED Driver for 4 Parallel-connected LEDs • Low Voltage Drop (<350mV) to Support Direct Li-ion Applications with Low VF LEDs • Independent Control Loop for Each LED • Regulated, Matched Constant Current in LEDs • No External Components • No EMI, No Switching Noise • Built-in DAC for Digital and PWM Brightness Control • Up to 91% Maximum Efficiency • Up to 84mA (21mA/LED) Bias Current • 2.7V to 5.5V Input Voltage Range •ICC < 1µA in Shutdown Mode • 3mmX3mm MLP-8 Package Applications • Cell Phones • Handheld Computers • PDA, DSC, MP3 Players • LCD Display Modules • Keyboard Backlight • LED Displays Description The FAN5610 generates matched current source drives for a maximum of four LEDs. Since each LED current source has its own self-regulating loop, precise current matching is maintained even if there is a substantial forward voltage spread among the LEDs. LED pre-selection therefore is not required. In order to minimize voltage drop, and maximize efficiency, the value of the internal current sense resistors connected in series with the LEDs is very low (10 Ω). This is an important consideration for direct DC-driven white LEDs in battery-powered systems. The LEDs’ current can be set to 0mA (OFF Mode), 7mA, 14mA, and 21mA with a built-in two-bit digital-to-analog converter. Customized current settings can also be used. When the control bits are set to zero, the internal circuitry is disabled and the quiescent current drops below 1µA. Both digital input lines (A, B) can be pulse-width-modulated (PWM). Using PWM, any value of average LED current can be obtained within the 1 to 20 mA range. The FAN5610 is available in an 8-lead 3X3 MLP package. FAN5610 LED Driver for White, Blue or any Color LED Typical Application D1 D2 D3 D4 V IN V IN GND FAN5610 IN B IN A D A C |
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