RT8452GS LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The RT8452GS is an LED driver controller IC manufactured by Richtek USA Inc., designed for power management applications requiring step-down (buck) and step-up (boost) topologies. This single-output DC-DC controller operates across a 4.5V to 36V supply range with analog and PWM dimming capabilities, making it suitable for backlight and lighting applications. The device is packaged in a 16-SOP surface mount configuration and maintains active product status with 2,150 units in current inventory.

Equivalent and substitute parts are identified based on matching functional topology, dimming control methods, output configuration, and thermal operating range. Substitutes may differ in package type, supply voltage range, frequency specifications, and temperature grades while maintaining core LED driver controller functionality.

Key Parameters

Parameter	RT8452GS Value
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
Applications	Backlight, Lighting
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the RT8452GS are selected based on the following core substitution criteria:

Primary Matching Parameters:

Type: DC DC Controller
Topology: Step-Down (Buck), Step-Up (Boost) or compatible subset
Number of Outputs: 1
Dimming Control: Analog, PWM, or PWM
Applications: Lighting or Backlight
Operating Temperature Range: Minimum -40°C, Maximum ≥125°C
RoHS Status: ROHS3 Compliant
Product Status: Active or equivalent

Secondary Compatibility Factors:

Supply voltage range overlap with 4.5V to 36V
Surface mount packaging
Frequency operation within practical LED driver range (100kHz to 2MHz)

Substitutes may vary in package type (16-SOIC, 28-TSSOP, 28-QFN, 20-HTSSOP, 38-TSSOP), maximum supply voltage (up to 100V), frequency range, and temperature grade (standard or automotive) while maintaining functional equivalence for LED driver applications.

Parameter Comparison

Parameter	RT8452GS	LT3791IFE#PBF	LT3796EFE#PBF	LT8391AHFE#PBF	LT8391AHUFD#TRPBF	LT8391EUFD#PBF	TPS61197DR	TPS92692PWPT
Manufacturer	Richtek USA Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments
Type	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller
Topology	Buck, Boost	Buck, Boost	SEPIC, Buck, Boost	Buck, Boost	Buck, Boost	Buck, Boost	Boost	Buck, Boost
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	4.5V	4.7V	6V	4V	4V	4V	8V	4.5V
Voltage - Supply (Max)	36V	60V	100V	60V	60V	60V	30V	65V
Dimming	Analog, PWM	Analog, PWM	Analog, PWM	Analog, PWM	Analog, PWM	Analog, PWM	PWM	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active	Active	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility):

LT3791IFE#PBF, LT8391AHUFD#TRPBF, LT8391AHFE#PBF, and LT8391EUFD#PBF are active products from Analog Devices Inc. with buck-boost topology, dual dimming control (analog and PWM), and operating temperature ranges meeting or exceeding the RT8452GS specification. These parts maintain ROHS3 compliance and support lighting applications. Package differences (38-TSSOP, 28-QFN, 28-TSSOP) require PCB layout modification but do not affect functional equivalence.

Extended Range Substitute:

LT3796EFE#PBF offers SEPIC topology in addition to buck-boost operation, supporting supply voltages up to 100V with ROHS3 compliance and active product status. This part is suitable for applications requiring extended input voltage range beyond the RT8452GS 36V maximum.

Alternative Substitute (Limited Application):

TPS92692PWPT from Texas Instruments provides buck-boost topology with dual dimming control across a 4.5V to 65V supply range. This part is active and ROHS3 compliant but operates at a lower maximum temperature (125°C TA vs. 125°C TJ for RT8452GS). Suitable for lighting and signage applications.

Not Recommended for New Designs:

TPS61197DR carries "Not For New Designs" status and is therefore not suitable for new product development, despite offering boost topology and PWM dimming. This part is included for reference only in legacy system maintenance scenarios.

Frequently Asked Questions (FAQ)

Q: Can LT8391AHUFD#TRPBF directly replace RT8452GS in existing designs?

A: LT8391AHUFD#TRPBF is functionally equivalent in topology, dimming control, and thermal range but uses a 28-QFN package versus the 16-SOIC of RT8452GS. PCB layout and footprint redesign is required. Pin configuration and control signal compatibility must be verified against device datasheets.

Q: What is the key difference between LT3791IFE#PBF and LT3796EFE#PBF?

A: LT3791IFE#PBF supports buck-boost topology with maximum 60V supply. LT3796EFE#PBF adds SEPIC topology capability and extends maximum supply voltage to 100V. Both maintain identical dimming control and temperature specifications. SEPIC topology provides additional flexibility for applications with wide input voltage variation.

Q: Why does TPS61197DR show "Not For New Designs" status?

A: TPS61197DR is a legacy product no longer recommended for new development. While functionally capable of boost conversion with PWM dimming, Analog Devices and Texas Instruments recommend using active alternatives such as LT8391 or TPS92692 series for new designs to ensure long-term supply availability and support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory status of RT8452GS.

Q: What packaging options are available among substitutes?

A: Substitutes are available in 16-SOIC (RT8452GS original), 28-TSSOP, 28-QFN, 38-TSSOP, and 20-HTSSOP packages. Package selection depends on PCB space constraints and thermal management requirements. Smaller packages (28-QFN, 28-TSSOP) offer space savings; larger packages (38-TSSOP) may provide improved thermal performance.

Q: Do all substitutes support both analog and PWM dimming?

A: LT3791IFE#PBF, LT3796EFE#PBF, LT8391AHFE#PBF, LT8391AHUFD#TRPBF, LT8391EUFD#PBF, and TPS92692PWPT support both analog and PWM dimming. TPS61197DR supports PWM dimming only and is not recommended for new designs.

Q: What is the inventory status of substitute parts?

A: LT3791IFE#PBF (2,200 pcs), LT3796EFE#PBF (2,900 pcs), LT8391AHFE#PBF (782 pcs), LT8391AHUFD#TRPBF (6,042 pcs), LT8391EUFD#PBF (2,360 pcs), TPS61197DR (3,326 pcs), and TPS92692PWPT (89,288 pcs) are available in current inventory. LT8391AHUFD#TRPBF and TPS92692PWPT offer the highest stock levels.

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