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RT8482GS LED Driver Controller - Equivalent & Substitute Parts
Part Overview
The RT8482GS is an active LED driver controller IC manufactured by Richtek USA Inc., designed for backlight and lighting applications. This 16-SOP surface mount device integrates a DC-DC controller with step-down (buck) and step-up (boost) topology, supporting both analog and PWM dimming at 350kHz switching frequency. With a supply voltage range of 4.5V to 36V and 48V output capability, the RT8482GS serves as a versatile power management solution for LED driver circuits. Substitute parts are identified for applications requiring alternative package formats, extended voltage ranges, or different thermal specifications while maintaining functional equivalence in LED driver control topology.
Substiute Parts
Key Parameters
| Parameter | RT8482GS |
|---|---|
| Manufacturer | Richtek USA Inc. |
| Category | Power Management (PMIC) |
| Type | DC DC Controller |
| Topology | Step-Down (Buck), Step-Up (Boost) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 4.5V |
| Voltage - Supply (Max) | 36V |
| Voltage - Output | 48V |
| Frequency | 350kHz |
| Dimming | Analog, PWM |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitute parts for the RT8482GS are selected based on functional equivalence in LED driver control topology and core electrical parameters. The primary substitution criteria are:
Topology Compatibility: All substitute parts maintain step-down (buck) and/or step-up (boost) DC-DC controller functionality for LED driver applications.
Dimming Capability: Substitute parts support PWM dimming as a minimum requirement, with some offering additional analog dimming support matching the RT8482GS feature set.
Supply Voltage Range: Substitute parts operate within overlapping or extended supply voltage windows. The RT8482GS operates 4.5V–36V; substitutes range from 4V–100V depending on the specific part.
Output Voltage: Substitute parts are rated for output voltages of 48V–60V, compatible with the RT8482GS 48V output specification.
Switching Frequency: Substitute parts operate at frequencies from 100kHz to 2MHz, encompassing the RT8482GS 350kHz baseline.
Package and Thermal: Substitutes are available in alternative surface mount packages (28-HTSSOP, 28-TSSOP, 28-QFN) with thermal ratings from -40°C to 150°C, accommodating different PCB layout and thermal management requirements.
Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, matching the RT8482GS regulatory status.
Parameter Comparison
| Parameter | RT8482GS | BD8381EFV-ME2 | LT3763EFE#PBF | LT3796HFE#PBF | LT8391AEUFD#PBF |
|---|---|---|---|---|---|
| Manufacturer | Richtek USA Inc. | ROHM Semiconductor | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Type | DC DC Controller | DC DC Controller | DC DC Controller | DC DC Controller | DC DC Controller |
| Topology | Buck, Boost | Buck, Boost | Buck | SEPIC, Buck, Boost | Buck, Boost |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Min) | 4.5V | 5V | 6V | 6V | 4V |
| Voltage - Supply (Max) | 36V | 30V | 60V | 100V | 60V |
| Voltage - Output | 48V | — | 55V | — | 60V |
| Frequency | 350kHz | 200kHz–600kHz | 200kHz–1MHz | 100kHz–1MHz | 600kHz–2MHz |
| Dimming | Analog, PWM | PWM | PWM | Analog, PWM | Analog, PWM |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 125°C (TJ) |
| Package / Case | 16-SOIC | 28-VSSOP | 28-TSSOP | 28-TSSOP | 28-WFQFN |
| Product Status | Active | Not For New Designs | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
LT8391AEUFD#PBF (Recommended Primary Substitute): This Analog Devices part is active and offers the broadest supply voltage range (4V–60V), encompassing the RT8482GS specification. It supports both analog and PWM dimming, matching the RT8482GS feature set. The 28-QFN package provides superior thermal performance with MSL-1 rating. Automotive grade qualification adds robustness for demanding applications.
LT3796HFE#PBF (Extended Temperature Alternative): This active Analog Devices controller extends the operating temperature to 150°C and supports SEPIC topology in addition to buck and boost modes. The 100V maximum supply voltage accommodates high-voltage LED driver applications beyond the RT8482GS range. MSL-1 rating and analog/PWM dimming support provide design flexibility.
LT3763EFE#PBF (Buck-Only Topology): This active part is suitable for step-down applications where boost functionality is not required. The 60V output rating and 200kHz–1MHz frequency range provide adequate performance for standard LED driver circuits. MSL-1 rating ensures reliability in moisture-sensitive environments.
BD8381EFV-ME2 (Legacy Consideration): This ROHM part carries "Not For New Designs" status and should be avoided for new development. The 30V maximum supply voltage is below the RT8482GS 36V rating, limiting applicability. Retained only for legacy system maintenance where existing designs mandate this specific part number.
Frequently Asked Questions (FAQ)
Q: Can I directly replace RT8482GS with LT8391AEUFD#PBF without PCB redesign?
A: Direct pin-for-pin replacement is not possible due to package differences (16-SOIC vs. 28-QFN). However, functional substitution is valid if your application can accommodate the larger 28-QFN footprint and associated layout changes. Verify control pin assignments and feedback network compatibility in the respective datasheets.
Q: Which substitute part best matches the RT8482GS supply voltage range?
A: LT8391AEUFD#PBF provides the closest match with 4V–60V range, covering the RT8482GS 4.5V–36V specification. LT3796HFE#PBF extends this to 100V for high-voltage applications.
Q: Does BD8381EFV-ME2 remain suitable for new designs?
A: No. BD8381EFV-ME2 carries "Not For New Designs" status from ROHM Semiconductor. This part should be used only for legacy system support or maintenance. All new designs should select from active-status alternatives: LT8391AEUFD#PBF, LT3796HFE#PBF, or LT3763EFE#PBF.
Q: What is the significance of MSL rating differences?
A: RT8482GS carries MSL-3 (168 hours), while LT8391AEUFD#PBF, LT3796HFE#PBF, and LT3763EFE#PBF are MSL-1 (unlimited). MSL-1 parts tolerate extended storage and higher humidity without baking requirements, reducing manufacturing complexity and cost.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts—BD8381EFV-ME2, LT3763EFE#PBF, LT3796HFE#PBF, and LT8391AEUFD#PBF—are ROHS3 compliant and REACH unaffected, matching the RT8482GS regulatory status.
Q: Which substitute supports the widest dimming capability?
A: LT8391AEUFD#PBF and LT3796HFE#PBF both support analog and PWM dimming, matching the RT8482GS. LT3763EFE#PBF supports PWM dimming only. BD8381EFV-ME2 also supports PWM dimming only.
Q: What is the thermal advantage of the 28-QFN package in LT8391AEUFD#PBF?
A: The 28-QFN (4x5) package with exposed pad provides superior thermal coupling to the PCB compared to the 16-SOIC package, enabling better heat dissipation and potentially lower junction temperatures under identical power dissipation conditions.
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