FAN5608MPX
FAN5608MPX Datasheet
FAN5608
| Part | Datasheet |
|---|---|
FAN5608MPX |
FAN5608MPX (pdf) |
| Related Parts | Information |
|---|---|
FAN5608HMPX |
FAN5608HMPX |
FAN5608DMPX |
FAN5608DMPX |
FAN5608DHMPX |
FAN5608DHMPX |
| PDF Datasheet Preview |
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| Preliminary Data Sheet FAN5608 Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter • Two Independent Channels Drive up to Six LEDs per Channel • Adaptive Output Voltage Drive to Maximize Efficiency • PWM/PFM Mode of Operation of the boost circuit • Up to 85% Efficiency • Up to 2 x 20mA Output • Two Built-in DACs for Independent Digital Brightness Control for Both Channels • LED’s Current Can be Duty-Cycle-Modulated between 0 to 20mA • Digital, analog, and PWM brightness control • 2.7V to 5V Input Voltage Range • 0.5MHz Operating Frequency 8MHz internal clock • Soft Start • Low Shutdown Current ICC < 1µA • LED Short Circuit Protection • Minimal External Components Needed • Available in an 8-lead MLP and a 12-lead MLP Package • Cell Phones • Handheld Computers • PDAs, DSCs, MP3 Players • Keyboard Backlights • LED Displays The FAN5608 LED driver generates regulated output currents from a battery with input voltage varying between 2.7V to 5V. An internal NMOS switch drives an external inductor, and a Schottky diode delivers the inductor’s stored energy to the load. Proprietary internal circuitry continuously monitors each LED current string and automatically adjusts the generated output DC voltage to the lowest minimum value required by the LED’s string with the highest summarized forward voltage. This adaptive nature of the FAN5608 ensures operation at the highest possible efficiency. Soft start circuitry prevents excessive current drawn from the supply during power on. Any number of LEDs can be connected in series as long as the summed forward voltages do not lead to exceeding the specified operating output voltage range. Although it is not required to have an equal number of LEDs connected in series within each branch, the highest efficiency and best current regulation is always achieved when an equal number of LEDs are serially connected. In the FAN5608 device, two internal two-bit D/A converters provide independent programmability of each output channel current. Analog programming of the output current is also possible in the FAN5608. To do this, ground the "B" pins and connect a resistor between the "A" pins and a fixed supply Analog or Digital Brightness Control FAN5608DHMPX FAN5608HMPX 2.7V to 5V L = 4.7µH VOUT VOUT 4.7µF A1 DAC Input For CH1 DAC Input For CH2 B2 NNCN 2.7V to 5V L = 4.7µH VOUT DAC Input For CH1 NC 4.7µF DAC Input For CH2 4X4mm MLP-12 Package with internal Schottky diode Order Code FAN5608DHMPX 4X4mm MLP-12 Package with external Schottky diode Order Code FAN5608HMPX FAN5608 Preliminary Data Sheet voltage. The output current can then be programmed to any desired value within its specified range. The FAN5608DMPX/FAN5608MPX version uses a single external resistor to set the current, and to turn the device ON and OFF. The FAN5608DMPX/FAN5608MPX is available in an 8-lead MLP package with or without an internal Schottky diode. The FAN5608DHMPX is available in a 12-lead MLP package with an internal Schottky diode. Typical Application Continued Analog Brightness Control 2.7V TO 5V L = 4.7µH IINNDD VEXTERNAL VOUT GND CH2 CH1 4.7µF FAN5608DMPX FAN5608MPX Ordering Information Product Number FAN5608 Package Type 12-Lead MLP 4x4mm 8-Lead MLP 3x3mm Schottky Diode Internal External Internal External FAN5608 Order Code FAN5608DHMPX FAN5608HMPX FAN5608DMPX FAN5608MPX DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. PRELIMINARY INFORMATION DESCRIBES PRODUCTS THAT ARE NOT IN FULL PRODUCTION AT THE TIME OF PRINTING. SPECIFICATIONS ARE BASED ON SIMULATION AND LIMITED CHARACTERIZATION. THEY MAY CHANGE WITHOUT NOTICE. CONTACT FAIRCHILD SEMICONDUCTOR FOR CURRENT INFORMATION. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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