FAN5608HMPX_NL Fairchild Semiconductor, FAN5608HMPX_NL Datasheet
FAN5608HMPX_NL
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FAN5608HMPX_NL Summary of contents
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... Keyboard backlights LED displays Ordering Information Part Number Pb-Free FAN5608DHMPX © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Description The FAN5608 is an integrated Schottky diode LED driver, which generates regulated output currents from a battery input voltage of 2.7V to 5V. An internal MOS switch and the external inductor deliver the necessary ...
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... Block Diagram Pin Configuration © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Figure 1. Block Diagram TOP-VIEW NC V INDB OUT GND INDA 1 9 CH2 CH1 4x4mm 12-Lead MLP(QUAD) (Internal Schottky Diode) FAN5608DHMPX Figure 2. FAN5608M MLP package 2 www ...
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... Avoid positive polarity ESD stress at the cathode of the internal Schottky diode (Schottky diode cathode <1.5kV). Recommended Operating Conditions Parameter Supply Voltage V IN Output Voltage Range Ambient Temperature ( © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 HBM (1,2) CDM Conditions P <0.6W, 2 channels evenly loaded OUT 3 Min ...
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... Typical Application Digital Brightness Control C IN 2.7V to 5.5V DAC Input For CH1 DAC Input For CH2 Analog Brightness Control 4.7µH 2.7V to 5.5V V EXTERNAL © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/ 4.7µH INDA INDB GND FAN5608DHMPX B1 CH2 CH1 A2 B2 Figure 3. FAN5608 Digital Brightness Circuit ...
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... DAC inputs to logic LOW. If the external output capacitor V shorted to GND, the internal Schottky diode can be damaged, a condition which should be avoided. © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Conditions A input LOW, B input LOW A input HIGH, B input HIGH ...
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... V EXT Figure 7. Analog Control © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 PWM Control in Digital Dynamic Mode In Digital Dynamic Mode, if inputs A1 and/or A2 are externally driven by an open-drain output, the pull-up resistance should be less than 10kΩ to ensure less than 0.7V dropout; VA > (V ...
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... Proportionally select the duty cycle to achieve a typical LED current from 1mA to 4mA. 6. Maximum PWM frequency can be 30KHz. 7. Proportionally select the duty cycle to achieve a typical LED current from 1mA to 19mA. © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 (average) – 5mA, where s is the duty cycle LED 30% 1KHz (average) – ...
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... FAN5608 operates in discontinuous conduction mode, resulting in higher inductor current ripple. To ensure proper operation of the current regulator over the entire range of conditions, select the inductor based © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 =4.7uF, 3-LEDs/CH OUT on the maximum output power (P ...
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... V EXT Figure 15. Analog Brightness Control © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 The current feeding the string of LEDs is the sum of the currents programmed for each channel in digital or > 3.5V to analog mode. Using all four inputs in digital mode, the IN LED current can be programmed within the 0 to 40mA range, according to the following table: > ...
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... Figure 18. FAN5608 with six LEDs L = 4.7µH 2.7V to 5.5V INDB DAC Input for CH1 FAN5608DHMPX A2 B1 DAC Input for CH2 B2 Figure 20. FAN5608 with eight LEDs © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 INDA V OUT V OUT 4.7µF GND CH2 CH1 NC Figure 17. FAN5608 efficiency with four LEDs INDA ...
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... Figure 22. FAN5608 with ten LEDs L = 2.7µH 2.7V to 5.5V INDB DAC Input for CH1 FAN5608DHMPX A2 B1 DAC Input for CH2 B2 Figure 24. FAN5608 with twelve LEDs © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 INDA V OUT V OUT 4.7µF GND CH2 CH1 NC Figure 23. FAN5608 efficiency with ten LEDs INDA ...
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... Dimensional Outline Drawings Dimensions are in millimeters unless otherwise noted. © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Figure 26. 4x4mm 12-Lead MLP 12 www.fairchildsemi.com ...
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... TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended exhaustive list of all such trademarks. ACEx™ GlobalOptoisolator™ ActiveArray™ GTO™ Bottomless™ HiSeC™ 2 Build it Now™ I C™ CoolFET™ ...