Features

• Ultra low dropout regulated 3-channel current

sinks

 40mV typ. at 10mA per channel

• Programmable LED setting by I2C compatible

interface

• Individual channel control

 On/Off Interval Time Control

 Dimming Up/Down Time

 RGB LED Color Control

• 191 current level setting

 24mA max, 0.125mA step

 ±5 current matching at max current

• AutoBlinQ LED1 (D1 pin) mode

 Blinking period: 2s

 Current setting: 8mA

• 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

• -40°C to +85°C Temperature Range

Applications

• RGB indicator LEDs

• Mobile Phones and Handheld Devices

• Digital Cameras

Brief Description

The KTD2037/2037B is a fully programmable, constant

current RGB LED driver with a flexible control interface.

The device is ideally powered from one-cell lithiumion/

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

systems with 3.3V or 5V supplies. It provides three

independent programmable constant current sinks without

requiring any 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 control

interface with a built-in decoder allowing individual control

of the LED channels’ On/Off state and current level. A total

of 191 current levels are available for each channel from

0.125mA to 24mA with a 0.125mA step.

An AutoBlinQ mode automatically turns on and off LED1

(on D1 pin) at 8mA every 2s after EN pin goes high. In this

mode, a phone with a discharged battery connected to a

charger can have LED1 blink to notify that the battery is

charging.

In shutdown mode, the quiescent current is reduced to less

than 1μA.

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

1.5mm x 0.5mm Ultra-Thin DFN package. The package is

Pb-free and RoHS compliant.