3 Bit 12V LED Driver CS8803 CS8803 3-Channel Constant-Current RGB LED Driver IC Product Description CS8803 is a 3-channel constant-current RGB LED driver IC, which is designed for LED lighting or display applications. At CS8803 output channel, 3-channel constant current value set is adjustable with three corresponding external resistors to match RGB color characteristics. CS8803 built in a voltage regulator, which provides supply voltage range form 5.0V to 12V, maintains constant current from 5mA to 60mA. Control signal (ENBO, LTO), data (SDO) and clock (CKO) buffer outputs are designed for cascading another chip. In addition, CS8803 guarantees to stand maximum 24V at the output channel. Features 3 constant current channels for RGB each Maximum output current capability: 60mA each channel Range of constant current for every channel: 5mA ~ 60mA Built-in buffers for cascading control signal (ENBO, LTO), data (SDO) and clock (CKO) to next driver IC Built-in voltage regulator working with supply voltage ranging from 5V ~ 12V Output current accuracy: Between channels: < +/- 6% (max.), and Between ICs : < +/- 6% (max.) Maximum output drain voltage: 24V For common anode LED application CMOS/TTL compatible input Applications LED decorative lighting Indoor/Outdoor LED video or message display Landscape lighting Neon lamp alternative Product Family CS8803BT ------- 20SSOP-150mil 1 Rev. 1.1 Chiplus reserves the right to change product or specification without notice. 3 Bit 12V LED Driver CS8803 Pin Assignment GNDA 1 20 VDD NC 2 19 NC REXT0 3 18 OUT0 REXT1 4 17 OUT1 REXT2 5 16 OUT2 ENB 6 15 ENBO LT 7 14 LTO CK 8 13 CKO SDI 9 12 SDO 10 11 CAP GNDD CS8803 Block Diagram 2 Rev. 1.1 Chiplus reserves the right to change product or specification without notice. 3 Bit 12V LED Driver CS8803 Pin Description Pin No. Pin Name Function 1 GNDA Analog ground 2 NC No used REXT0~REXT2 Input terminal used to connect an external resistor for setting up output 3~5 current for all output channels 6 ENB Output enable input terminal When ENB is active (low), the output ports are enabled; when ENB is inactive (high), all output ports are turned off (blanked) 7 LT Data strobe input terminal The data in shift register is transferred to the data latch when LT is high. The data is latched when LT goes low 8 CK Clock input terminal for data shift on rising edge 9 SDI Serial data input terminal to the shift register 10 GNDD Digital ground 11 CAP Connected to a compensated capacitor for the regulator output 12 SDO Serial data output terminal to be connected to the SDI of the next driver IC. SDO signal changes on falling edge of CK 13 CKO Clock output terminal, CK replica, connected to the next CK 14 LTO LT output terminal, LT replica, connected to the next LT 15 ENBO ENB output terminal, ENB replica, connected to the next ENB OUT2~OUT0 Constant current output terminal 19 NC No used 20 VDD Supply voltage terminal 16~18 3 Rev. 1.1 Chiplus reserves the right to change product or specification without notice. 3 Bit 12V LED Driver CS8803 Equivalent Circuits of I/O pins ENB pin CK, SDI pins LT pin SDO, ENBO, LTO, CKO pins Maximum Ratings Characteristic Symbol Rating Unit Supply Voltage VDD +15 V Input Voltage VIN -0.4~VDD+0.4 V Output Current per Output Channel IOUT +60 mA Sustaining Voltage at OUT port VDS 24.0 V GND Terminal Current IGND 1000 mA Power Dissipation at 25 PD 1.2 W Thermal Resistance Rth(j-a) 73.43 /W Operating Junction Temperature Tj,max 150 Operating Temperature Topr -40~+85 Storage Temperature Tstg -55~+150 4 Rev. 1.1 Chiplus reserves the right to change product or specification without notice. 3 Bit 12V LED Driver CS8803 Application Information Application Circuit Figure 4 Note 1. When the Rext is 590, the IOUT is 20mA. 2. C1~C6 are required. The values of the C1/C4 and C3/C6 are for reference only. The value of C2/C5 ranges from 4.7F/16V to 10F/16V. Tantalum capacitors or capacitors with ESR<2 are recommended. 3. C7~C22 and R7~R22 can modify the signal waveforms. Order information Part No. Package Type Lead Pitch CS8803BT 20SSOP(150mil) 0.64 mm 5 Rev. 1.1 Chiplus reserves the right to change product or specification without notice.