sp6887 Exar Corporation, sp6887 Datasheet
sp6887
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sp6887 Summary of contents
Page 1
... LED backlighting LCD Modules Handheld Devices The SP6887 is a 4-channel charge pump white LED driver, capable of driving LEDs connected in parallel. The device operates in either 1x mode or 1.5x fractional mode, and it can switch from 1x mode to 1.5x mode automatically when the input voltage decreases. Its internal 4 current sink regulators ensure both LED current matching and brightness uniformity ...
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... Logic high ( Logic low (or GND LED output off IN Rev. C – 10/31/2007 CTR0 LED4 LED3 Table 1: LED Enable Logic SP6887 4 Channel WLED Driver 2/10 BLOCK DIAGRAM LED Output LED2 LED1 - - © 2007 Exar Corporation ...
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... Storage Temperature Range .... -65ºC to +160ºC Lead Temperature ................................. 300ºC IN ESD Ratings – Human Body Model ........... 2000V IN Ambient Temperature ...............-40ºC to +85ºC ILED per LED ..............................0mA to 30mA Symbol θ SP6887 4 Channel WLED Driver 3/10 PIN DESCRIPTION Package Max Unit TQFN-16 34 ºC TQFN-16 2.9 W ...
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... O 1.5x Mode, I =100mA O I =15mA LED I =20mA LED On Inputs EN, CTR0, 1 & Inputs EN, CTR0, 1 & Inputs EN, CTR0, 1 & 2 =1µF, T =25ºC, unless otherwise noted Efficiency vs Output Current (4 LEDs) SP6887 4 Channel WLED Driver 4/10 Min Typ. Max Unit 2.7 5.5 V 0.05 1 µA 0.6 1 ...
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... LED Current vs Input Voltage (4 LEDs) 5. Ground Current vs Input Voltage 7. Output Voltage vs Input Voltage Rev. C – 10/31/2007 ELECTRICAL SPECIFICATIONS 4. Supply Current vs Input Voltage (4 LEDs) 6. Oscillator Frequency vs Input Voltage 8. Output Resistance vs Input Voltage SP6887 4 Channel WLED Driver 5/10 © 2007 Exar Corporation ...
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... LED Current Setting Using RSET 11. LED Current Setting Using a PWM Signal to EN Pin 12. LED Current Setting Using a PWM Signal to CTR0 Pin Rev. C – 10/31/2007 ELECTRICAL SPECIFICATIONS 10. LED Current Setting Using a DC Voltage to SP6887 4 Channel WLED Driver 6/10 RSET Pin © 2007 Exar Corporation ...
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... Detailed Description As shown in the block diagram on page 2, the main components within the SP6887 include a fractional charge pump, mode selection circuit, output selection logic, LED current setting detection circuit, and 4 current sense circuits. The fractional charge pump multiplies the input voltage a multiple of 1X and 1.5X times the input voltage ...
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... ILED. Frequency <100Hz can naturally cause the LEDs to blink visibly. circuit. PWM ILED (mA) 13.3 10.9 8.4 6.0 3.6 1.1 Figure 2: PWM Signal at CTR0 Pin for LED SP6887 4 Channel WLED Driver 8/10 THEORY OF OPERATION Control = ( LED_ON ON OFF PWM ...
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... A large via (metalized square pad provides a low impedance connection to the ground plane on the opposite side of the PCB and allows the heat dissipated by the driver IC to spread out resulting performance. SP6887 4 Channel WLED Driver 9/10 THEORY OF OPERATION mode, the 1MHz switching hole) centered in ...
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... Thin QFN-16 -40ºC to +85ºC Thin QFN-16 Exar Corporation Headquarters and Sales Offices 48720 Kato Road Fremont, CA 94538 – USA Tel.: +1 (510) 668-7000 Fax: +1 (510) 668-7030 www.exar.com SP6887 4 Channel WLED Driver 10/10 PACKAGE ORDERING INFORMATION Packing Marking Quantity 6887 ER4 - YWWX ...