LDS8865 IXYS Corporation, LDS8865 Datasheet
LDS8865
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LDS8865 Summary of contents
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... Digital Still Cameras o Handheld Devices o DESCRIPTION The LDS8865 is a high efficiency multi-mode fractional charge pump with ultra low feedback TYPICAL APPLICATION CIRCUIT © 2009 IXYS Corp. Characteristics subject to change without notice voltage that can drive up to six LEDs. The ultra low dropout PowerLite Current Regulator increases device’ ...
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... LDS8865 ABSOLUTE MAXIMUM RATINGS Parameter Vin, LEDx, C1±, C2± voltage Vout voltage PWM1, PWM2 voltage Storage Temperature Range Junction Temperature Range Lead Temperature RECOMMENDED OPERATING CONDITIONS Parameter Vin Ambient Temperature Range ELECTRICAL OPERATING CHARACTERISTICS (Over recommended operating conditions unless specified otherwise) Vin = 3.6V 0.22 µF, C 25° ...
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... LDS8865 PIN DESCRIPTION Pin # Name 1 LEDC2 LEDC2 cathode terminal 2 LEDC1 LEDC1 cathode terminal 3 LEDB2 LEDB2 cathode terminal 4 LEDB1 LEDB1 cathode terminal 5 LEDA2 LEDA2 cathode terminal 6 LEDA1 LEDA1 cathode terminal 7 V Charge pump output connected to the LED anodes OUT 8 V Charge pump input, connect to battery or supply ...
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... LDS8865 TYPICAL CHARACTERISTICS Vin = 3.6V 120mA (6 LEDs at 20mA), C OUT Efficiency vs. Input Voltage Power-Up in 1.5x Mode Ch1 – PWM, PWM2, Ch2 – Vout, Ch3 – Output current (100mA/div) Power-Down Delay (1x Mode) Ch1 – PWM, PWM2, Ch2 – Vout, Ch3 – Output current (100mA/div) © 2009 IXYS Corp. ...
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... LDS8865 Switching Waveforms in 1.5x Mode Ch1 – Vin (AC coupled), Ch2 – Vout (AC coupled), Ch3 – Output current (AC coupled 20mA/div) Switching Waveforms at 1kHz PWM mode Ch1 – PWM, PWM2, Ch2 – Vout, Ch3 – Output current (100mA/div) Switching Waveforms at 50kHz PWM mode Ch1 – PWM, PWM2, Ch2 – Vout, Ch3 – ...
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... LED with highest forward © 2009 IXYS Corp. Characteristics subject to change without notice Figure 2. LDS8865 Functional Block Diagram voltage), the Mode Control Block changes charge pump mode to the next multiplication ratio Charge Pump Output Resistance at given mode, Iout is sum of all LED currents, and charge pump’ ...
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... Operation of PWM-based LED Current Control The maximum current value in each of the LDS8865’s three LED banks is factory preset; to set each ILED below this value, a PWM (a duty cycle based) control signal can be applied at the PWM1/PWM2 pins. ...
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... LED current regulation are not affected because the LEDs are off during this time. If the PWM1/PWM2 pins are held high or low longer than 30ms (Time to Shutdown), the LDS8865 turns LEDs off. If PWM1/PWM2 pins are low, shutdown mode is enabled and the supply current drops to 1 µA or less ...
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... LDS8865 LED Selection LEDs with forward voltages (V ) ranging from 1 3.6 V may be used. Charge pumps operate in highest efficiency when V voltage is close multiplied by switching mode, i.e. V and so on. If the power source is a Li-ion battery, LEDs with VF = 2.7V - 3.3V are recommended to achieve highest efficiency performance and extended operation on a single battery charge ...
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... LDS8865 PACKAGE DRAWING AND DIMENSIONS 16-PIN TQFN (HV3), 3mm x 3mm, 0.5mm PITCH SYMBOL MIN NOM A 0.70 0.75 A1 0.00 0.02 A2 0.178 0.203 b 0.20 0.25 D 2.95 3.00 D1 1.65 1.70 E 2.95 3.00 E1 1.65 1.70 e 0.50 typ L 0.325 0.375 m 0.150 typ n 0.225 typ Note: 1. All dimensions are in millimeters 2. Complies with JEDEC Standard MO-220 © 2009 IXYS Corp. ...
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... The standard lead finish is Matte-Tin. 3) The device used in the above example is a LDS8865 002–T2 ( 3x3 TQFN, Tape & Reel, 32/25/10.5 mA maximum current per LED bank 4) For additional package and temperature options, please contact your nearest IXYS Corp. Sales office. © 2009 IXYS Corp. ...
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... LDS8865 Warranty and Use IXYS CORP. MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES ...