特性 Features

? Ultra low dropout regulated current sinks

? 3-Channels: KTD2026

? 4-Channels: KTD2027

? 40mV typical at 10mA per channel

Programmable LED setting using I2C control

? Individual channel control

? On/Off Interval Time Control

? Dimming Up/Down Time

? Current Level Setting

? RGB or RGBW LED Color Control

? 192 current levels: 24mA max, 0.125mA step

? ±5 current matching for max current

? Low supply current of 200μA typ.

? No noise, non-pulsating LED current

? Fast, smooth start-up

? VIN Range: 2.7V to 5.5V

? 0.1μA Shutdown Current

? Pb-free Package: UTDFN-8 1.5x1.5mm

? RoHS and Green Compliant

? -40°C to +85°C Temperature Range

Applications

? RGB indicator LEDs

? Flashing LEDs

? Mobile Phones

? Handheld Devices

? Digital Cameras

Brief Description

The KTD2026/7 are fully programmable, constant current

RGB or RGBW LED drivers with a flexible control interface.

The devices are ideally powered from one-cell lithiumion/

polymer, 3-cell NiCd/NiMH/Alkaline batteries, or

systems with 3.3V or 5V supplies. The independent

programmable constant current sinks operate without

external components.

With an on-chip timing control unit, LED blink rate, fade-in

and fade-out are user-adjustable resulting in unique color

lighting patterns.

Ten internal registers are programmed via the I2C interface

with a built-in decoder allowing individual control of the

three/four LED channels’ On/Off state and current level. A

total of 192 current levels are available for each channel

from 0.125mA to 24mA with a 0.125mA step.

In shutdown mode, the quiescent current is reduced to less

than 1μA.

The driver is available in a low profile 8-pin 1.5mm x 1.5mm

x 0.5mm Ultra-Thin DFN package. The packages are Pbfree,

RoHS and Green compliant.