40x9(360 LED) Matrix LED Driver IC for High-Performance LED Display Applications
The IS31FL3758 supports a configurable matrix ranging from 48 channels (48ch) up to a 40×9 matrix, consisting of 48 constant current sinks and 9 gate drivers (SW1-SW9) for external PMOS transistors. This new design allows for improved thermal management by offloading power dissipation to the external PMOS transistors outside the device package, enabling efficient heat dissipation in high-power applications. It supports flexible matrix configurations such as 48ch, 47×1, 46×2, 45×3, down to 40×8 and 40×9, offering designers significant flexibility in LED array layouts.
Each of the 48 constant current sinks supports a maximum output current of 60mA, adjustable via three 8-bit global current control registers (GCCR, GCCG, GCCB) for grouped channels (e.g., CS1, CS4, CS7…CS46 for GCCR; CS2, CS5, CS8…CS47 for GCCG; CS3, CS6, CS9…CS48 for GCCB). This grouped control optimizes current adjustment precision while reducing bus bandwidth requirements. The communication interface supports either a high-speed 12MHz SPI or a 1MHz I2C bus, ensuring seamless integration with a wide range of microcontrollers and system design needs. The device also features an SDB pin rising edge bus reset for either the SPI or I2C interface, enhancing operational reliability.
The IS31FL3758 incorporates advanced features to minimize power supply ripple and electromagnetic interference (EMI). Its 137kHz PWM frequency (in 8-bit mode) with spread spectrum technology (±5% to ±30% range options), combined with 6-group phase delay functionality, significantly reduces power bus noise and improves overall system performance. Additional noise reduction is achieved through proprietary algorithms that mitigate the impact of passive components like MLCC decoupling capacitors. These features make the IS31FL3758 suitable for applications requiring clean power and low EMI, such as high-end appliance control panels and gaming machines.
Additional features include 8-bit or 6+2-bit dithering PWM dimming with 256-step precision for smooth brightness or color mixing control, programmable open/short detection with fault storage registers for enhanced reliability and ease of manufacturing/debugging, and a built-in de-ghosting circuit to eliminate LED ghosting artifacts in matrix scanning operations. The device operates over a wide voltage range of 2.7V to 5.5V and an industrial temperature range of -40°C to +125°C. It also offers robust protection features, including thermal shutdown (160°C with 25°C hysteresis), over-current protection (configurable at 90mA or 120mA), and under-voltage lockout. The minimum headroom voltage of 200mV (typical) at 40mA ensures efficient operation, while current accuracy is maintained at ±7% bit-to-bit and ±6% device-to-device at 40mA.
The IS31FL3758 is available now in a compact 7×7mm QFN-60 package, with a thermal resistance (θ_JA) of 32.6°C/W, supporting a maximum power dissipation of approximately 3.07W at 25°C ambient temperature (per JESD 51-2A standards). It is RoHS and Halogen-Free compliant, with ordering information for part number IS31FL3758-QFLS4-TR (2500 units per reel).
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