Lumissil IS31FL3749

IS31FL3749 is a matrix LED driver with 24 high voltage (16V) constant current channels. It supports from one to four power scan to become a 24×n (n=1~4) matrix LED driver. Each LED can be pulse width modulated (PWM) with maximum 16-bit precision for smooth LED brightness control. In addition, each LED can be controlled by an 8-bit output current control register (Dot correction, current scale, SL), which allows fine tuning the current for rich RGB color mixing, e.g., a pure white color LED application. 

Key features

• 24*4 Channel, 16V LED matrix,16bit PWM, Interface – VSB (33MHz) or SPI (33MHz)
• 8+8-bit/8+4bit dithering method PWM, >20kHz scan frequency to avoid audible noise
• Built-in de-ghosting circuit, Reduced inactive LED reverse bias to improve LED reliability
• Programmable open/short LED detection, LED info stored in registers for easy debugging

Additional features

• Support 24 constant current channels, 60mA/ch
• Tolerate up to 20V, nominal operation voltage between 4.3V to 16V, multiple LED’s can be connected in series
• Built-in LDO to generate 4.8V supply for internal logic (option to float it and use external power)
• Interface - VSB (video serial bus, 33MHz) - SPI (33MHz)
• Reset register reset all the registers to default
• Support 8-bit, 16-bit, 8+4-bit dithering and 8+8bit dithering PWM mode
• Built-in Dot correction: 8-bit/dot
• 8-bit × 3 global current adjustment
• 4 groups delay to minimize the power ripple
• Support bi-directional read data output via DI
• PSW short protection
• Spread spectrum
• Programmable detection of open/short, detected LED and store detected LED information in registers for ease of manufacturing/debugging
• Low standby and sleep mode current
• For matrix scanning operation - Built-in de-ghosting circuit - Reduced inactive LED reverse bias to improve LED reliability
• Over temperature protection
• Operating temperature: -40°C to 125°C
• QFN-48 (6mm × 6mm) package
• RoHS & Halogen-Free compliance
• TSCA compliance

Applications

• Cluster display
• Mini LED back light
• LED back light
• Center information display