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Product Detailed Parameters
- Description：IC LED DRVR RGLTR PWM 50MA 32QFN
- Series：-
- Mfr：Renesas Electronics Corporation
- Package：Tape & Reel (TR)
- Type：DC DC Regulator
- Topology：Step-Up (Boost)
- Internal Switch(s)：Yes
- Number of Outputs：8
- Voltage - Supply (Min)：4.75V
- Voltage - Supply (Max)：26V
- Voltage - Output：45V
- Current - Output / Channel：50mA
- Frequency：500kHz ~ 1.5MHz
- Dimming：PWM
- Applications：Backlight
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：32-VFQFN Exposed Pad
- Supplier Device Package：32-QFN (5x5)
- Grade：-
- Qualification：-
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Overview
The ISL97678IRZ-T is an eight-channel PWM dimming LED driver designed for LCD backlight applications. It operates from a supply voltage range of 4.75V to 26V and supports up to 96 LEDs at 50mA each, provided the total forward voltage remains below the 45V maximum output limit. The device features dynamic headroom control to minimize power loss and maintains ±1% current matching across all channels. It supports external PWM dimming frequencies up to 30kHz with a duty cycle range of 0.4% to 100%. The boost switching frequency is adjustable between 600kHz and 1.5MHz. It is housed in a 32-lead QFN package measuring 5mm x 5mm.
Feature Summary
- Eight independent voltage-controlled current sources with high precision matching
- Dynamic headroom control for optimized efficiency in multi-string configurations
- Wide-range PWM dimming capability with adjustable frequency parameters
- Integrated protection mechanisms including open/short circuit detection and thermal shutdown
Applications
- Notebook display WLED backlighting
- RGB LED backlighting systems
- LCD monitor backlight drivers
Procurement Notes
Verify component authenticity through authorized Renesas distributors or certified partners. Confirm the specific suffix designation matches the required reel packaging configuration. Ensure compliance with RoHS directives and check for moisture sensitivity level requirements during storage and handling procedures prior to assembly.
Selection Notes
Select this driver when designing systems requiring precise current regulation across multiple LED strings. Consider the adjustable switching frequency for EMI management and the wide input voltage range for flexibility in power supply design. Evaluate the thermal performance within the specified operating temperature range to ensure reliability under continuous load conditions.
Part Context
This component belongs to the ISL97678 series of LED drivers manufactured by Renesas Electronics Corporation. It is part of a broader portfolio of power management solutions focused on display technologies. The series is engineered to provide efficient and reliable driving capabilities for modern liquid crystal display backlights, ensuring uniform brightness and color consistency.
Replacement Considerations
Consult official Renesas documentation for verified cross-reference part numbers. Ensure any substitute component matches the pinout, electrical specifications, and thermal characteristics of the original device to maintain system integrity.
