KTD2801/A/B 36V/30V/24V Step-Up LED Driver with Internal Diode and Serial Control Features Brief Description Wide V input range: 2.7V to 5.5V IN The KTD2801/A/B is a versatile constant current LED Wide output range: up to 10 series LEDs driver with a high efficiency DC-DC step up boost Integrated 40V high current switch (0.52A limit) converter architecture. The low-side power MOSFET and High efficiency boost converter (up to 85%) high-side diode are integrated in the device, minimizing the Highly integrated solution total number of external components. Unique technology Integrated diode and high 0.52A current limit allow KTD2801 to drive up to Internal compensation and soft start 36V output (10 LEDs in series), or KTD2801A 30V output TM ExpressWire interface dual method dimming (8 LEDs in series) or KTD2801B 24V output (6 LEDs). with single pin (CTRL) Alternatively, the KTD2810 can deliver 40mA total current 256-step Serial dimming control for two parallel strings of up to 6 series LEDs. It can also High resolution PWM dimming maximize the current capability while achieving high High accuracy across full load range conversion efficiency. The optimized 1MHz switching LED open-circuit (OVP) protection frequency results in small external component size. The KTD2801 : 36V driver is equipped with an internal decoder that allows KTD2801A : 30V digital FB control dimming for 256-step (8-bit) current KTD2801B : 24V programming and can also be used for PWM dimming with Low 200mV feedback voltage a one-line control signal. 1MHz High switching frequency Various protection features are built into the KTD2801/A/B, Simple, small solution size including cycle-by-cycle input current limit protection, LED < 1 A shutdown current open-circuit (output over voltage) protection and thermal Small TDFN22-6 and Thin SOT23 package shutdown protection. The leakage current in shutdown RoHS and Green compliant mode is less than 1A. -40C to +85C Temperature Range The device is available in a RoHS compliant 6-lead TDFN22 package and 6-lead Thin SOT-23 package Applications LED backlighting Mobile Phones, Handheld Devices Digital Photo Frames, Automotive Navigation Typical Application VIN 2.7V to 5.5V L 22H C C OUT IN 0.47F 10F Up to 10 LEDs in series VIN LX or up to 2P6S VOUT Brightness Control: TM ExpressWire or CTRL FB PWM dimming GND R1 10 April 2017 Revision 04b Page 1 Company Confidential KTD2801/A/B Pin Descriptions Pin Name Function TDFN22-6 TSOT-23-6 IC control pin. Can be used to enable/disable the IC, as well as to program the 1 4 CTRL output current using ExpressWire Control or PWM dimming. 2 6 VIN Input supply pin for the IC 3 5 VOUT Output voltage pin 4 3 FB Feedback voltage pin 5 2 GND Converter/IC ground 6 1 LX Switching node of the step-up converter Metal chassis. Connect to ground for electrical and thermal usage. MC - MC (TDFN22-6 PKG only) TDFN22-6 PKG (Top View) CTRL 1 6 LX 2 5 VIN MC GND 3 4 VOUT FB TSOT-23-6 PKG (Top View) 6 LX 1 VIN 2 5 GND VOUT 3 FB 4 CTRL April 2017 Revision 04b Page 2 Company Confidential