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.