KTD3122 High Efficiency Step-Up LED Driver with Integrated Power Diode Features Brief Description Wide input range: 2.7V to 5.5V KTD3122 is the ideal power solution for white LED Highly integrated solution with high efficiency backlighting used with small to medium size LCD panels. It Integrated 30V power diode is a highly integrated step-up converter accommodating Integrated 30V power MOSFET single cell lithium ion batteries or 5V regulated supply. Integrated 2-channel current sinks, up to KTD3122 integrates a 30V power diode and a 30V power 8-LEDs per string MOSFET as well as compensation and soft start circuitry, High accuracy up to 30mA/ch which results in a simpler and smaller solution with much 0.6% current matching at 20mA fewer external components. Adjustable switching 1.5% current accuracy at 20mA frequency (1MHz/500kHz) and OVP threshold (30V/24V) Dual dimming control scheme allow the use of a smaller inductor and capacitor to further 2 I C interface control with 256 steps reduce the solution size. Wide range PWM Dimming for CABC KTD3122 has two regulated current sinks up to 30mA per 100Hz to 100kHz Frequency string. With a maximum of 30V at the output of the step-up 0.1%~100% Duty Cycle at 10kHz converter, each string can connect up to 8 LEDs in series, Input PWM glitch filter 2 or up to 16 LEDs total. I C interface for various controls Programmable current sink ramp up/down time 2 KTD3122 is equipped with I C interface for various and shape (Exponential/Linear) controls. For additional flexibility, wide frequency (100Hz to Selectable 1MHz and 500kHz switching 100kHz) and duty cycle range (0.1% to 100% at 10kHz) frequency with frequency shift option PWM dimming control is included and can support Content Programmable OVP (30V/24V), current limit Adaptive Brightness Control (CABC). (1A/0.7A) and LX pin slew rate Various protection features are built into KTD3122, LED open/short protection including cycle-by-cycle input current limit protection, Pb-free Packages: TQFN33-16, WLCSP-12 output over-voltage protection, LED fault (open or short) -40C to +85C Temperature Range protection and thermal shutdown protection. Applications KTD3122 is available in a RoHS compliant and Green 16-lead 3mm x 3mm x 0.75mm Thin-QFN or 12-ball Smartphone/Tablet Backlight 1.21mm x 1.65mm x 0.62mm WLCSP package. PDA/GPS Backlight Typical Application L White LEDs Up to 8 in series VIN 10H 2.7V to 5.5V C IN C OUT 10F 1F LX VOUT VIN EN S1 PWM MCU S2 SDA SCL AGND PGND February 2016 Revision 04d Page 1 Company Confidential KTD3122 Pin Descriptions Pin Pin Name Function (TQFN33-16) (WLCSP-12) Bi-direction data pin of the IC interface. If IC interface is not used, 14 A1 SDA SDA should be connected to VIN. IC enable pin. An active logic high enables the device. There is an 16 A2 EN internal 400k pull-down resistor at this pin. PWM dimming input pin. There is an internal 400k pull-down resistor 15 A3 PWM at this pin. Clock input pin of the IC interface. If IC interface is not used, 13 B1 SCL SCL should be connected to VIN. 4 B2, C3 PGND Power Ground pin 2 B3 VIN Input supply pin for the device 10 C1 S2 Regulated output current sink 2 3 C2 AGND Analog Ground pin 9 D1 S1 Regulated output current sink 1 7 D2 VOUT Output pin of the step-up converter 5, 6 D3 LX Switching pin of the step-up converter 1, 8, 11,12 - NC Not internally connected Metal chassis. Connect to ground for electrical and thermal usage. MC - MC is internally connected to Analog Ground pin. TQFN33-16 WLCSP-12 (Top View) (Top View) 1 2 3 16 15 14 13 A SDA EN PWM 12 NC NC 1 B SCL PGND VIN 2 11 VIN NC MC XXYYZ 3 10 S2 AGND C S2 AGND PGND S1 PGND 4 9 D S1 VOUT LX 5 6 7 8 12-Bump 1.21mm x 1.65mm x 0.62mm WLCSP Package YYZ (Date Code and Assembly Code) XX = Device Code (Top Mask) February 2016 Revision 04d Page 2 Company Confidential LX EN LX PWM VOUT SDA NC SCL