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

• IR LED Drivers

• Video Door Bells

• Security Cameras

• IRIS Recognition Cameras

Brief Description

The KTD2041 is an ideal power solution for IR 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.

It 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 KTD2041 has 9 built-in current sinks, which features

independent On/Off control and 6-bit independent

current dimming via I2C interface. The KTD2041 has

extensive built-in protection features including cycle-bycycle

current limit, input undervoltage Lockout (UVLO),

output over-voltage protection, LED fault (open or short)

protection and thermal shutdown protection.

The KTD2041 is available in a RoHS and Green

compliant 3mm x 3mm UQFN package.