LDS8868 IXYS Corporation, LDS8868 Datasheet
LDS8868
Available stocks
Related parts for LDS8868
LDS8868 Summary of contents
Page 1
... Digital Still Cameras o PDAs and Smartphones o DESCRIPTION The LDS8868 is a high efficiency multi-mode fractional charge pump with ultra low dropout voltage that can drive up to six LEDs. Inclusion of an ultra low TYPICAL APPLICATION CIRCUIT © 2009 IXYS Corp. Characteristics subject to change without notice dropout PowerLite™ ...
Page 2
... LDS8868 ABSOLUTE MAXIMUM RATINGS Parameter V , LEDx, C1±, C2± voltage IN V voltage OUT EN/SET voltage Storage Temperature Range Junction Temperature Range Soldering Temperature RECOMMENDED OPERATING CONDITIONS Parameter V IN Ambient Temperature Range Typical application circuit with external components is shown on page 1. ELECTRICAL OPERATING CHARACTERISTICS ...
Page 3
... LDS8868 RECOMMENDED EN/SET TIMING For 2.7 V 5.5V, over full ambient temperature range -40 to +85ºC. IN Symbol Name t EN/SET setup from shutdown SETUP t EN/SET program low time LO t EN/SET program high time HI t EN/SET low time to shutdown OFF t EN/SET Delay to DATA DATADELAY t EN/SET Delay High to ADDRESS RESETDELAY Figure 1 ...
Page 4
... LDS8868 Table 3. REG2-5 Current Setting Registers Data Reg2-5 value LED Current, Pulses (binary) mA, IMODE = 0 0 000000 0.0 1 111111 3.75 2 111110 3.5 3 111101 3.25 4 111100 3 5 111011 2.75 6 111010 2.5 7 111001 2.25 8 111000 2 9 110111 1.75 10 110110 1.5 11 110101 1.25 12 110100 1 13 110011 0.75 14 110010 0.5 15 110001 0.25 16 110000 0.0 17 101111 18 101110 19 101101 20 101100 21 101011 22 101010 ...
Page 5
... LDS8868 PROGRAMMING EXAMPLES Programming 6 LEDs to 32mA Programming 6 LED to 1mA © 2009 IXYS Corp. Characteristics subject to change without notice 5 Doc. No. 8868_DS, Rev. N2.1 ...
Page 6
... LDS8868 TYPICAL CHARACTERISTICS V = 3.6V 120mA (6 LEDs at 20mA OUT Efficiency vs. Input Voltage Power-Up in 1.5x Mode EN/SET V OUT ILED 100mA/div Power-Down Delay (1x Mode) EN/SET V OUT ILED 100mA/div © 2009 IXYS Corp. Characteristics subject to change without notice = 0.22 μ 1μ 25°C unless otherwise specified ...
Page 7
... LDS8868 Operating Waveforms in 1.5x Mode OUT ILED 100mA/div © 2009 IXYS Corp. Characteristics subject to change without notice Operating Waveforms in 2x Mode OUT ILED 100mA/div 7 Doc. No. 8868_DS, Rev. N2.1 ...
Page 8
... LDS8868 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 ...
Page 9
... LED forward voltage V significantly increasing F driver’s efficiency. The LDS8868 monitors voltage drop Vd across PCR at every channel in ON state. If this voltage falls below 75 mV (typical) at any one channel, (channel with LED with highest forward voltage), the Mode Control Block changes charge pump mode to the next multiplication ratio ...
Page 10
... A test current is placed in the channel to sense when the channel moves below V address. If Protection Modes The LDS8868 has follow protection modes: Figure 3. Application circuit with 5 LEDs 1. LED short LED pin is shorted to V becomes as short circuit, or LED pin voltage is within from V OUT recognizes this condition as “ ...
Page 11
... The LDS8868 requires restart after die temperature falls below 130°C. 5. Input Voltage Under-Voltage Lockout If V falls below 2.2 V (typical value), LDS8868 IN enters shutdown mode and all registers data are cleared. Device requires restart when input voltage rises above 2 restart device, set EN/SET pin ...
Page 12
... LDS8868 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. ...
Page 13
... All packages are RoHS-compliant (Lead-free, Halogen-free). 2) The standard lead finish is Matte-Tin. 3) The device used in the above example is a LDS8868A 002–T2 (3x3 TQFN, Tape & Reel). 4) For additional package and temperature options, please contact your nearest IXYS Corp. Sales office. © 2009 IXYS Corp. ...
Page 14
... LDS8868 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 ...