RT8450BGCP LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT8450BGCP is an active LED Driver IC manufactured by Richtek USA Inc., designed for power management applications requiring step-down (buck) and step-up (boost) topology with PWM dimming capability. This device integrates a 1.5A internal switch and operates across a 4.5V to 40V supply range, making it suitable for backlight and lighting applications. The part is housed in a 16-TSSOP-EP package and maintains ROHS3 compliance with MSL-3 moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching functional topology, output configuration, dimming capability, and thermal operating range. Substitutes may vary in package form factor, current rating, and supply voltage specifications while maintaining core LED driver functionality.

Key Parameters

Parameter	RT8450BGCP
Manufacturer	Richtek USA Inc.
Type	DC DC Regulator
Topology	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Internal Switch(s)	Yes
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	40V
Current - Output / Channel	1.5A (Switch)
Frequency	500kHz
Dimming	Analog, PWM
Applications	Backlight, Lighting
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the RT8450BGCP are categorized based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Topology: Step-Down (Buck), Step-Up (Boost) configuration
Number of Outputs: Single output (1)
Internal Switch: Integrated switch requirement
Dimming Capability: Analog and/or PWM dimming support
Supply Voltage Range: Minimum 4.5V to maximum 40V overlap
Current Rating: 1.5A or higher switch current
Operating Temperature: -40°C to 85°C or wider range
Applications: Backlight and/or Lighting use cases

Secondary Considerations:

Package form factor (surface mount variants acceptable)
RoHS3 compliance and MSL rating
Product status (active preferred)

Substitutes are grouped into two categories: Full Topology Matches (buck-boost capable) and Topology-Specific Matches (boost-only or buck-only with equivalent electrical performance for the intended application).

Parameter Comparison

Part Number	Manufacturer	Topology	Current (A)	Supply Min (V)	Supply Max (V)	Dimming	Frequency (MHz)	Temp Range (°C)	Package	Status
RT8450BGCP	Richtek USA Inc.	Buck, Boost	1.5	4.5	40	Analog, PWM	0.5	-40 ~ 85	16-TSSOP-EP	Active
MP2483DQ-LF-P	Monolithic Power Systems Inc.	Buck, Boost	2.5	4.5	55	Analog, PWM	0.5	-40 ~ 85	10-QFN (3x3)	Active
NCP3066MNTXG	onsemi	Buck, Boost	1.5	3	40	Analog, PWM	0.15	0 ~ 85	8-DFN (4x4)	Active
LT3592EMSE#PBF	Analog Devices Inc.	Buck	0.5	3.6	36	—	0.4 ~ 2.2	-40 ~ 125	10-MSOP-EP	Active
ST1CC40PUR	STMicroelectronics	Buck	3	3	18	—	0.85	-40 ~ 150	8-VFQFPN (4x4)	Active
SP6699EK-L/TR	MaxLinear, Inc.	Boost	0.5	2.5	16	PWM	1	-40 ~ 85	SOT-23-6	Obsolete
LT3491ESC8#TRPBF	Analog Devices Inc.	Boost	0.35	2.5	12	PWM	2.3	-40 ~ 85	SC-70-8	Active
AP5725WUG-7	Diodes Incorporated	Boost	0.75	2.7	5.5	PWM	1.2	-40 ~ 85	TSOT-23-6	Active
MIC2291YD5-TR	Microchip Technology	Boost	1.2	2.5	10	Analog, PWM	1.2	-40 ~ 125	TSOT-23-5	Active
MP3301GJ-Z	Monolithic Power Systems Inc.	Boost	1	2.5	6	Analog, PWM	1.3	-40 ~ 125	TSOT-23-5	Active
MCP1643-I/MC	Microchip Technology	Boost	0.55	0.5	5	PWM	1	-40 ~ 85	8-DFN (2x3)	Active

Engineering Selection Recommendations

Full Topology Equivalents (Buck-Boost Capable):

MP2483DQ-LF-P and NCP3066MNTXG provide the closest functional match to RT8450BGCP. Both devices support integrated buck-boost topology with 1.5A switch current, analog and PWM dimming, and -40°C to 85°C operating range. MP2483DQ-LF-P offers higher current capability (2.5A) and extended supply voltage range (55V maximum), suitable for higher-power lighting applications. NCP3066MNTXG maintains identical 1.5A rating and 40V maximum supply, with lower operating temperature minimum (0°C vs. -40°C). Both are ROHS3 compliant and active products.

Buck-Only Alternatives:

LT3592EMSE#PBF and ST1CC40PUR are step-down regulators suitable for applications where boost functionality is not required. LT3592EMSE#PBF operates across 3.6V to 36V with extended temperature range (-40°C to 125°C) and is ROHS3 compliant. ST1CC40PUR provides 3A current capability with -40°C to 150°C operating range, ideal for high-temperature lighting environments. Both lack PWM dimming capability; selection depends on application requirements.

Boost-Only Alternatives:

MIC2291YD5-TR, MP3301GJ-Z, and LT3491ESC8#TRPBF are step-up regulators for applications requiring voltage elevation. MIC2291YD5-TR offers 1.2A current with analog and PWM dimming across -40°C to 125°C. MP3301GJ-Z provides 1A current with dual dimming modes and 36V output capability. LT3491ESC8#TRPBF delivers 350mA with 2.3MHz frequency in compact SC-70-8 package. All three are ROHS3 compliant and active products.

Obsolete Part Consideration:

SP6699EK-L/TR is marked obsolete and should not be selected for new designs despite functional similarity. Active alternatives with equivalent specifications are available.

Frequently Asked Questions (FAQ)

Q: Can RT8450BGCP be directly replaced with a boost-only device like MIC2291YD5-TR?

A: Direct replacement is possible only if the application requires boost functionality exclusively. RT8450BGCP supports both buck and boost topologies; applications utilizing step-down regulation cannot use boost-only substitutes. Verify circuit topology requirements before substitution.

Q: What is the significance of the 16-TSSOP-EP package versus 10-QFN or SOT-23 packages in substitute parts?

A: Package form factor affects PCB layout, thermal dissipation, and board space. 16-TSSOP-EP provides larger exposed pad for heat transfer compared to smaller packages. Substitutes with different packages (10-QFN, SOT-23-5, SOT-23-6) may require circuit board redesign. Verify thermal requirements and available board space before selecting alternative packages.

Q: Does MSL-3 rating of RT8450BGCP affect substitute selection?

A: MSL-3 indicates 168-hour moisture sensitivity; most active substitutes carry MSL-1 (unlimited) rating, offering superior moisture tolerance. This represents an improvement over the original part. No compatibility issues arise from lower MSL ratings.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification, matching the original RT8450BGCP specification.

Q: Can MP2483DQ-LF-P replace RT8450BGCP in a 1.5A application?

A: Yes. MP2483DQ-LF-P supports 2.5A switch current, exceeding the 1.5A requirement. It maintains buck-boost topology, dual dimming modes, and identical 500kHz frequency. Supply voltage range (4.5V to 55V) encompasses RT8450BGCP specifications (4.5V to 40V). Operating temperature range (-40°C to 85°C) matches exactly. Substitution is electrically valid; verify package compatibility with circuit board layout.

Q: What distinguishes NCP3066MNTXG from MP2483DQ-LF-P as substitutes?

A: NCP3066MNTXG matches RT8450BGCP current rating (1.5A) and maximum supply voltage (40V) precisely, with lower switching frequency (150kHz vs. 500kHz). MP2483DQ-LF-P provides higher current capability (2.5A) and extended supply range (55V maximum). Selection depends on application current requirements and frequency constraints. Both support identical dimming modes and temperature range.

Q: Is LT3592EMSE#PBF suitable for applications requiring PWM dimming?

A: No. LT3592EMSE#PBF lacks dimming capability (dimming field marked as "—"). This device is suitable only for fixed-output lighting applications. For PWM or analog dimming requirements, select MIC2291YD5-TR, MP3301GJ-Z, or full-topology alternatives like MP2483DQ-LF-P or NCP3066MNTXG.

Q: Why is SP6699EK-L/TR listed if it is obsolete?

A: SP6699EK-L/TR is documented as an obsolete part for reference purposes only. It should not be selected for new designs. Active alternatives with equivalent or superior specifications are available from the substitute list.

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