特性 Features

? Drives up to 12 LEDs (4 RGBs)

? Multiplexed LED Current Driver Outputs

? Only 4 PCB Traces to the LEDs

? 20.8kHz MUX Frequency Prevents Audio Noise

? 14 Million Colors

? LED Current: 125μA to 24mA in 125μA Steps

? Night-Mode: 8μA to 1.5mA in 8μA Steps

? 5 Max. Current Accuracy & Matching

? 12 Independent Exponential Fade-Engines

? Ultra-Smooth 3072-Step (8μA) Fade Resolution

? 3-bit Programmable Fade-Rate

? Flexible Pattern Generator with Watchdog Counter

? Optional AutoBreathe? Mode (KTD2052B/D)

? Patented1 BrightExtend? Technology

? Maintains Color-Accuracy and PSRR for Battery-

Powered Applications with Low Vin

? Proprietary CoolExtend? Technology

? 2-bit Programmable Maximum Die-Temp

? 0.6μA Automatic Shutdown (Standby) Current

? 1MHz I2C Serial Interface

? 2.5V to 5.5V Operating Supply Voltage Range

? -40°C to +85°C Operating Temperature Range

? 8 pin UDFN 2x2mm (0.5mm pitch)

Applications

? AI Smart Speakers, Bluetooth / WiFi Loudspeakers

? Automotive Indicator and Ambiance Lighting

? IoT, Gaming, Toys, Indicator / Button Lighting

Brief Description

The KTD2052 is a fully programmable current regulator

for up to four RGB LEDs (12 LEDs total). The device is

ideally powered from a supply rail in the 3V to 5V

nominal range. A 4-wire bus is multiplexed to reduce

the pin-count and PCB traces to the LEDs. Each pin

on the bus integrates a switch to the input voltage and

a programmable low-dropout current sink regulator.

There are four versions: the KTD2052A/C are

defaulted disabled at initial power-up, while the

KTD2052B/D execute an AutoBreathe? pattern by

default at initial power-up or when reset. The

KTD2052A/B use 0x74 7-bit I2C slave address, while

the KTD2052C/D use 0x75. See the Ordering

Information section.

The I2C control interface is used to set the on/off status

and individual LED currents, as well as adjust the faderate.

An internal flexible pattern generator with

watchdog counter enables set-and-forget pattern

executions, while more complex patterns may be

executed from system firmware via the I2C interface.

BrightExtend? optionally reduces dropout when the

input voltage is too low for the forward voltage of the

LEDs. Programmable CoolExtend? prevents

excessive heat when the input voltage, current settings,

and ambient temperature are high.

The KTD2052 is packaged in RoHS and Green

compliant 2mm x 2mm UDFN package.