Brief Description

The KTD2042 is an ideal power solution for RGBW LED

driver with an integrated buck regulator. It has 9 highprecision

current sinks that can be independently

controlled via I2C interface.

The buck regulator has an input voltage operating range

from 2.7V to 5.5V to accommodate 1-cell lithium-ion

batteries or 5V voltage rail. It has adaptive output

voltage control based on the headroom voltages of the

LED current sinks to minimize the power consumption.

has integrated high-side and low-side power FET. The

buck regulator features advanced adaptive On-Time

control with 1MHz switching frequency, which minimizes

external component counts and allows the use of a very

small inductor and capacitor.

The KTD2042 has 9 built-in current sinks, which features

independent On/Off control and 6-bit independent

current dimming via I2C interface. The KTD2042 has

extensive built-in protection features including cycle-bycycle

current limit, input undervoltage Lockout (UVLO),

output over-voltage protection, LED fault (open)

protection and thermal shutdown protection.

The KTD2042 is available in a RoHS and Green

compliant 3mm x 3mm UQFN package.

Features

• 2.7V to 5.5V Input Voltage Operating Range

• Nine High-Precision Current Sinks

 LED Current Up to 32mA per Channel

 ±1 Typical Current Matching

 ±2 Typical Current Accuracy at 32mA

 6-bit Current Dimming Control with I2C

 Independent On/Off Control

 Supports both Independent and Global Dimming

• High Efficiency Buck Regulator

 Integrated 200mΩ / 100mΩ High / Low-Side FET

 Adaptive On-Time Control with default 1MHz

Switching Frequency, with factory programmable

1.5MHz, 2MHz, and 2.5MHz options.

 Adaptive VOUT Control Based on the Headroom

Voltages of the LED Current Sinks.

 Selectable Auto-Skip Mode or Forced-PWM mode

at Light Loads

• 140μA Typical No-Load Supply Current

• Open-Drain ̅F̅̅A̅̅U̅̅L̅̅T̅ Signal Output and Fault Reset

• Extensive Fault Diagnostics

• -40°C - 85°C Operating Ambient Temperature Range

• Small UQFN-20 (3mm x 3mm) Package

Applications

• RGBW LED Drivers

• Video Door Bells

• Security Cameras

• IRIS Recognition Cameras