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.