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Product Detailed Parameters
- Description：IC LED DRV CTRL PWM 34.5MA 32QFN
- Series：-
- Mfr：Lumissil Microsystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：DC DC Controller
- Topology：-
- Internal Switch(s)：No
- Number of Outputs：18
- Voltage - Supply (Min)：2.7V
- Voltage - Supply (Max)：5.5V
- Voltage - Output：-
- Current - Output / Channel：34.5mA
- Frequency：-
- Dimming：PWM
- Applications：LED Lighting
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：32-WFQFN Exposed Pad
- Supplier Device Package：32-QFN (4x4)
- Grade：-
- Qualification：-
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Overview
The IS31FL3746B-QFLS4-TR is an LED matrix driver supporting up to 72 LEDs in a programmable 18xN configuration. It features a 12MHz SPI interface and 24kHz PWM dimming with 8-bit resolution for dot correction and global current control. The device operates on a 2.7V to 5.5V supply, delivering 34.5mA per channel. It includes VIO level shifting and de-ghosting capabilities. Packaged in a compact 32-QFN (4x4mm) surface-mount format, it supports I²C or SPI communication protocols for system integration.
Feature Summary
- Supports programmable matrix configurations up to 18x4 for flexible LED layout
- Integrates 8-bit PWM resolution for precise dot-to-dot brightness uniformity
- Includes hardware de-ghosting logic to eliminate visual artifacts during scanning
- Features VIO level shifting for compatibility with various logic voltage levels
Applications
- Automotive instrument cluster displays
- Infotainment system button backlights
- Dashboard status indicator matrices
- High-density LED graphic displays
Procurement Notes
Verify the specific suffix QFLS4-TR against the manufacturer's latest datasheet to confirm package dimensions and tape-and-reel specifications. Ensure the design supports the required 12MHz SPI clock speed and that the PCB footprint matches the 32-QFN (4x4mm) outline. Confirm thermal management requirements for the exposed pad under continuous operation conditions.
Selection Notes
Select this component when a high-pin-count LED matrix requires individual dot correction without external microcontrollers handling PWM timing. It is suitable for designs needing robust de-ghosting performance in automotive environments. Compare against the IS31FL3748 series if a different pin count or interface protocol is preferred. Ensure the application voltage range aligns with the 2.7V to 5.5V operating window.
Part Context
This part belongs to the Lumissil IS31FL37xx family of LED matrix drivers designed for automotive and industrial applications. It shares functional similarities with the IS31FL3741A and IS31FL3748 models but offers a specific 18xN matrix topology. The family emphasizes low power consumption and high reliability for safety-critical display systems.
Replacement Considerations
The IS31FL3746A may serve as a predecessor variant; verify electrical characteristics and pinout compatibility before substitution. No direct cross-model replacements are officially confirmed in public documentation.
