KTD2037/2037B 2 I C Programmable RGB LED Driver with AutoBlinQ Features Brief Description Ultra low dropout regulated 3-channel current The KTD2037/2037B is a fully programmable, constant sinks current RGB LED driver with a flexible control interface. 40mV typ. at 10mA per channel The device is ideally powered from one-cell lithium- 2 Programmable LED setting by I C compatible ion/polymer, 3-cell NiCd/NiMH/Alkaline batteries, or interface systems with 3.3V or 5V supplies. It provides three Individual channel control independent programmable constant current sinks without On/Off Interval Time Control requiring any external components. Dimming Up/Down Time With an on-chip timing control unit, LED blink rate, fade-in RGB LED Color Control and fade-out are user-adjustable resulting in unique color 191 current level setting lighting patterns. 24mA max, 0.125mA step 2 5% current matching at max current Ten internal registers are programmed via the I C control AutoBlinQ LED1 (D1 pin) mode interface with a built-in decoder allowing individual control Blinking period: 2s of the LED channels On/Off state and current level. A total Current setting: 8mA of 191 current levels are available for each channel from No noise, non-pulsating LED current 0.125mA to 24mA with a 0.125mA step. Fast, smooth start-up An AutoBlinQ mode automatically turns on and off LED1 VIN Range: 2.7V to 5.5V (on D1 pin) at 8mA every 2s after EN pin goes high. In this 0.1A Shutdown Current mode, a phone with a discharged battery connected to a Pb-free Package: UTDFN-8 1.5x1.5mm charger can have LED1 blink to notify that the battery is -40C to +85C Temperature Range charging. In shutdown mode, the quiescent current is reduced to less Applications than 1A. The device is available in a low profile 8-pin 1.5mm x RGB indicator LEDs 1.5mm x 0.5mm Ultra-Thin DFN package. The package is Mobile Phones and Handheld Devices Pb-free and RoHS compliant. Digital Cameras Typical Application V BATT C1 VIN 1.0uF GPIO D1 EN 2 I C Interface D2 AP SCL SDA D3 GND 3 channels In parallel Figure 1. Typical Application Circuit August 2017 Revision 04d Page 1 Company Confidential KTD2037/2037B Typical Application (continued) USB Connector Charger V V BATT BUS OVP IC System VBUS Device or PMIC DM KTS1680 Battery KTS1681 DP KTS1682 V BATT ID GND C1 VIN 1.0uF D1 EN 2 I C Interface D2 SCL AP SDA D3 GND 3 channels In parallel Figure 2. Application Circuit with External Charger and VBUS Detection USB Connector V V BUS BATT OVP VBUS System Switching Device Charger STAT DM KTS1680 Battery KTS1681 DP KTS1682 V BATT ID GND C1 VIN 1.0uF D1 EN 2 I C Interface D2 SCL AP SDA D3 GND 3 channels In parallel Figure 3. Application Circuit with Internal Charger IC Status Detection August 2017 Revision 04d Page 2 Company Confidential