t KTD2026/KTD2027 2 Constant Current RGB/White LED Driver with I C Control Features Brief Description Ultra low dropout regulated current sinks The KTD2026/7 are fully programmable, constant current 3-Channels: KTD2026 RGB or RGBW LED drivers with a flexible control interface. 4-Channels: KTD2027 The devices are ideally powered from one-cell lithium- 40mV typical at 10mA per channel ion/polymer, 3-cell NiCd/NiMH/Alkaline batteries, or 2 Programmable LED setting using I C control systems with 3.3V or 5V supplies. The independent Individual channel control programmable constant current sinks operate without On/Off Interval Time Control external components. Dimming Up/Down Time With an on-chip timing control unit, LED blink rate, fade-in Current Level Setting and fade-out are user-adjustable resulting in unique color RGB or RGBW LED Color Control lighting patterns. 192 current levels: 24mA max, 0.125mA step 2 5% current matching for max current Ten internal registers are programmed via the I C interface Low supply current of 200A typ. with a built-in decoder allowing individual control of the No noise, non-pulsating LED current three/four LED channels On/Off state and current level. A Fast, smooth start-up total of 192 current levels are available for each channel VIN Range: 2.7V to 5.5V from 0.125mA to 24mA with a 0.125mA step. 0.1A Shutdown Current In shutdown mode, the quiescent current is reduced to less Pb-free Package: UTDFN-8 1.5x1.5mm than 1A. -40C to +85C Temperature Range The driver is available in a low profile 8-pin 1.5mm x 1.5mm x 0.5mm Ultra-Thin DFN package. The packages are Pb- Applications free and RoHS compliant. RGB indicator LEDs Flashing LEDs Mobile Phones Handheld Devices Digital Cameras Typical Application VIN VIN VIN 2.7V to 5.5V 2.7V to 5.5V 2.7V to 5.5V C1 C1 C1 1.0uF 1.0F 1.0F D1 D2 D3 D1 D2 D3 D1 D2 D3 D4 VIN VIN VIN 2 I C Control SCL SCL KTD2026 Enable EN KTD2022 KTD2027 2 SCL SDA I C Control SDA ExpressWire Control CTRL 2 I C Control SDA Status Output Status Output ST ST GGNDND GND October 2017 Revision 04g Page 1 Company Confidential t KTD2026/KTD2027 Pin Descriptions UTDFN 1.5x1.5, 8-pin Package Pin Name Function KTD2026 KTD2027 Status open-drain logic output stays low (on state) during first half of the flash period 1 -- ST (50% duty cycle) then goes to high-impedance (off) during second half of the flash period. An optional pull-up resistor can be connected from this pin to the supply. Regulated output current sink D4. Current level and ON/OFF selections are controlled -- 1 D4 by serial interface. Regulated output current sink D3. Current level and ON/OFF selections are controlled 2 2 D3 by serial interface. Regulated output current sink D2. Current level and ON/OFF selections are controlled 3 3 D2 by serial interface. Regulated output current sink D1. Current level and ON/OFF selections are controlled 4 4 D1 by serial interface. 5 5 VIN Input power for the IC. 6 6 SCL Clock of the IC interface. 7 7 SDA Data of the IC interface. 8 8 GND Ground pin. KTD2026 KTD2027 (Top View) (Top View) ST 1 8 GND D4 1 8 GND D3 2 7 SDA D3 2 7 SDA D2 3 6 SCL D2 3 6 SCL D1 VIN D1 4 5 VIN 4 5 October 2017 Revision 04g Page 2 Company Confidential KTD2026 KTD2027