IS31FL3197 CHARGE PUMP RGBW LED DRIVER WITH PROGRAMMABLE SELF-RUNNING PATTERNS August 2020 GENERAL DESCRIPTION FEATURES The IS31FL3197 is a charge pump LED driver with 2.0V to 3.3V supply voltage programmable sequence operation for automated Charge pump RGBW lighting effects. It is capable of driving 4 LEDs - 1x, 1.5x, 2x operating modes up to 10mA (adjustable in 256 current levels and 4096 - Highly efficient across battery state of charge PWM levels) from a small coin size battery supply. - 1MHz constant frequency The builtin charge pump structure will automatically Power saving operating toggle between 1x, 1.5x or 2x operation depending on - Quiescent operating current 700A (Typ.) the batterys state of charge. This DC/DC converter - Shutdown current 1A (Typ.) operates at a high switching frequency which enables Support four LEDs - RGBW the use of small external capacitors and achieves a - Resistor sets maximum 10mA output current per 90% peak efficiency. To conserve battery life, the LED charge pump goes into high impedance mode - Each LED has 8-bit programmable current levels whenever the IS31FL3197 is shutdown. - Each LED has 12-bit programmable PWM levels The IS31FL3197 can operate in either Current Level & LEDs operate with pre-established patterns PWM mode or Pattern mode. In Current Level & - Once programmed runs without micro PWM mode, the output current of each output is - OUT1~OUT3 have their own fade ON/OFF timing independently programmed and controlled in 4096 registers (TS~T4) with independent start/ steps to achieve color mixing and the PWM duty cycle stop/crossfade of each output is also independently programmed and - Fixed number of iterations or non-stop operation controlled in 4096 steps to simplify color mixing or for - Crossfade of one color to another smoothly diming control. In Pattern mode, the timing characteristics for RGB channels output can be Fast 400kHz I2C bus interface individually adjusted to maintain a pre-established - Automatic address increment function pattern sequence without requiring any additional MCU - 4 selectable I2C address locations interaction, thus saving valuable system resources. Over-temperature protection The IS31FL3197 is available in a small QFN-16 QFN-16 (4mm4mm) and WLCSP-16 (4mm4mm) and WLCSP-16 (1.88mm1.8mm, (1.88mm1.8mm, 0.45mm ball pitch, 0.2mm ball 0.45mm ball pitch, 0.2mm ball diameter) packages. It diameter) packages operates from 2.0V to 3.3V over the temperature range Operating temperature T = -40C ~ +85C A of -40C to +85C. APPLICATIONS With automated lighting effects and a DC/DC charge Internet-of-Things (IOT) pump, the small package IS31FL3197 is ideal for low power battery applications. Electronic Shelf Labeling (ESL) Low-power battery applications Hand-held devices requiring visual notifications Lumissil Microsystems www.lumissil.com 1 Rev. A, 07/28/2020 IS31FL3197 TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Lumissil Microsystems www.lumissil.com 2 Rev. A, 07/28/2020