RT8480GS LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The RT8480GS is an active LED driver controller IC manufactured by Richtek USA Inc., designed for power management applications requiring DC-DC conversion with PWM dimming capability. This 16-SOP surface mount device operates across a 4.5V to 36V supply range and supports SEPIC and Step-Up (Boost) topologies for backlight and lighting applications. With 25,200 units in current inventory and active product status, the RT8480GS remains a primary selection for new designs. Substitute parts are identified when supply constraints, packaging preferences, or specific topology requirements necessitate alternative component selection.

Substiute Parts

RT8480GS

Richtek USA Inc.In Stock: 25280RT8480GS Datasheet

Current PartRFQ

LT3756IMSE#PBF

Analog Devices Inc.In Stock: 4893LT3756IMSE#PBF Datasheet

SimilarRFQ

MP4008GS

Monolithic Power Systems Inc.In Stock: 1130MP4008GS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT8480GS are selected based on functional equivalence within the following criteria:

Primary Substitution Parameters:

• DC-DC controller topology supporting SEPIC and/or Step-Up (Boost) configurations
• Single output channel
• No internal switch requirement
• PWM and/or Analog dimming capability
• Operating temperature range of -40°C to 125°C (TJ)
• Surface mount packaging
• Active product status
• ROHS3 compliance

Secondary Compatibility Factors:

• Supply voltage range overlap with RT8480GS (4.5V–36V minimum requirement)
• Switching frequency in the range of 100kHz to 1MHz
• 16-pin package variants (SOIC, MSOP, or equivalent pin count)

The identified substitutes meet these criteria while accommodating variations in package form factor, supply voltage ceiling, and frequency specification.

Parameter Comparison

Engineering Selection Recommendations

RT8480GS (Primary Selection) Recommended for designs requiring the specified 4.5V minimum supply voltage and 16-pin SOIC package footprint. Active product status with 25,200 units in inventory ensures supply continuity. ROHS3 compliance and MSL-3 rating support standard manufacturing environments.

LT3756IMSE#PBF (Topology-Extended Substitute) Suitable when designs require extended supply voltage range (up to 100V) or additional topology flexibility (Flyback, Buck capability). The 16-TFSOP package with exposed pad provides thermal performance advantages in high-power applications. Frequency range of 100kHz–1MHz accommodates broader design specifications. MSL-1 rating indicates superior moisture resistance. Pin-to-pin compatibility requires verification against specific application requirements.

MP4008GS (Compact Substitute) Applicable for space-constrained designs accepting 8-pin SOIC packaging and PWM-only dimming. Supply voltage range (9V–28V) limits use to applications within this window. Lower switching frequency (180kHz) suits applications with relaxed EMI requirements. MSL-2 rating requires controlled storage conditions (1 Year).

All substitutes maintain active product status, ROHS3 compliance, and identical operating temperature range, ensuring regulatory and environmental consistency with the primary part.

Frequently Asked Questions (FAQ)

Q: Can LT3756IMSE#PBF replace RT8480GS in all applications? A: LT3756IMSE#PBF is functionally compatible for applications within the overlapping supply voltage range (6V–36V). The LT3756 supports additional topologies (Flyback, Buck) and higher maximum supply voltage (100V). However, the 16-TFSOP package differs from the 16-SOIC footprint of the RT8480GS, requiring PCB layout modification. Analog dimming capability is preserved in both devices.

Q: Is MP4008GS suitable for 4.5V minimum supply applications? A: No. MP4008GS specifies a 9V minimum supply voltage, making it incompatible with applications requiring 4.5V operation. This substitute is limited to designs operating within the 9V–28V range.

Q: What are the package differences between these three parts? A: RT8480GS uses 16-SOIC (0.154" width), LT3756IMSE#PBF uses 16-TFSOP with exposed pad (0.118" width), and MP4008GS uses 8-SOIC (0.154" width). Pin count and footprint differ; direct socket compatibility does not exist. PCB redesign is required for package substitution.

Q: Do all three parts support both Analog and PWM dimming? A: RT8480GS and LT3756IMSE#PBF support both Analog and PWM dimming. MP4008GS supports PWM dimming only. Applications requiring Analog dimming must use RT8480GS or LT3756IMSE#PBF.

Q: What is the significance of MSL ratings for these parts? A: MSL (Moisture Sensitivity Level) indicates storage and handling requirements. RT8480GS (MSL-3, 168 hours) requires controlled humidity storage. LT3756IMSE#PBF (MSL-1, Unlimited) has no moisture sensitivity restrictions. MP4008GS (MSL-2, 1 Year) requires annual reflow or baking. Selection depends on manufacturing environment and inventory management practices.

Q: Are all three parts ROHS3 compliant? A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.