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Product Detailed Parameters
- Description：IC LED DRVR CTRLR PWM 28HTSSOP
- Series：-
- Mfr：Rohm Semiconductor
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：DC DC Controller
- Topology：Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s)：No
- Number of Outputs：4
- Voltage - Supply (Min)：4.5V
- Voltage - Supply (Max)：35V
- Voltage - Output：-
- Current - Output / Channel：120mA
- Frequency：200kHz ~ 2.2MHz
- Dimming：PWM
- Applications：-
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：28-VSSOP (0.173", 4.40mm Width) Exposed Pad
- Supplier Device Package：28-HTSSOP-B
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The BD81A44EFV-ME2 is a four-channel LED driver IC from Rohm Semiconductor, designed for automotive applications. It features a buck-boost topology with an input voltage range of 4.5 V to 35 V and supports up to 40 V output. Each channel delivers a maximum current of 120 mA, totaling 480 mA across all outputs. The device operates at a switching frequency between 200 kHz and 2.2 MHz and includes PWM dimming capabilities. It is housed in a 28-pin HTSSOP-B package and meets AEC-Q100 Grade 1 standards for operation between -40°C and +125°C.
Feature Summary
- Integrates a buck-boost DC/DC controller with four independent constant-current channels for stable LED drive under varying input voltages.
- Supports high-resolution PWM dimming control for precise brightness adjustment in automotive lighting systems.
- Includes comprehensive protection mechanisms such as over-voltage, over-current, thermal shutdown, and LED open/short detection.
Applications
- Automotive LCD backlight driving
- High-brightness white LED illumination
- Vehicle interior lighting systems
Procurement Notes
Verify the specific suffix ME2 against the official Rohm datasheet to confirm pinout and packaging details. Ensure the design accounts for the AEC-Q100 Grade 1 qualification requirements for automotive reliability. Confirm that the 28-pin HTSSOP-B package thermal characteristics meet the system's heat dissipation needs within the specified operating temperature range.
Selection Notes
Select this component when a buck-boost topology is required to handle wide input voltage fluctuations in automotive environments. It is suitable for designs needing four isolated current channels with integrated protection. Consider the 2.2 MHz maximum switching frequency for EMI management and external component size optimization compared to lower-frequency alternatives.
Part Context
This part belongs to the BD81A series of automotive-grade LED drivers. It shares functional similarities with models like the BD81A74EFV-ME2 but differs in specific electrical ratings and package configurations. The series is characterized by its integration of power switches and control logic for simplified PCB layout in display backlight applications.
Replacement Considerations
The BD81A74EFV-ME2 is a documented alternative within the same family, offering similar four-channel functionality. Verify compatibility regarding the specific voltage limits and package dimensions before substitution.
