BD6155FVM-TR LED Driver IC Equivalent & Substitute Parts

Part Overview

The BD6155FVM-TR is an LED Driver IC manufactured by Rohm Semiconductor, classified as a Power Management PMIC. This device functions as a 1-output DC DC regulator utilizing switched capacitor (charge pump) topology with an 80mA output capability, designed for backlight applications. The part operates across a 2.9V to 5.5V supply range and delivers a fixed 5.6V output at 120kHz switching frequency.

The BD6155FVM-TR is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring similar functionality.

Key Parameters

Parameter	BD6155FVM-TR
Manufacturer	Rohm Semiconductor
Product Status	Obsolete
Type	DC DC Regulator
Topology	Switched Capacitor (Charge Pump)
Number of Outputs	1
Voltage - Supply (Min)	2.9V
Voltage - Supply (Max)	5.5V
Voltage - Output	5.6V
Current - Output / Channel	80mA
Frequency	120kHz
Package / Case	8-VSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature	-25°C ~ 75°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the BD6155FVM-TR is based on the following critical parameters:

Primary Substitution Criteria:

DC DC Regulator type with single output
Supply voltage range compatibility (minimum 2.9V to 5.5V overlap)
Output voltage in the 5V to 6V range
Output current capability of 80mA or greater
Switched capacitor (charge pump) topology preferred for direct equivalence
Surface mount packaging with 8-pin or smaller footprint
ROHS3 compliance and MSL rating of 1 or 2

Secondary Compatibility Factors:

Operating temperature range overlap with -25°C to 75°C
Active product status preferred over obsolete
Dimming capability (if application requires)
Switching frequency in the 100kHz to 1.2MHz range

The substitute parts listed below meet varying degrees of these criteria. Parts are grouped by topology alignment and functional compatibility.

Parameter Comparison

Parameter	BD6155FVM-TR	LTC3218EDDB#TRMPBF	FAN5341UMPX	LM3410YSDE/NOPB	A6213KLJTR-T	RT8476GS
Manufacturer	Rohm Semiconductor	Analog Devices Inc.	onsemi	Texas Instruments	Allegro MicroSystems	Richtek USA Inc.
Product Status	Obsolete	Active	Active	Active	Active	Obsolete
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Switched Capacitor (Charge Pump)	Switched Capacitor (Charge Pump)	Step-Up (Boost)	SEPIC, Step-Up (Boost)	Step-Down (Buck)	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	2.9V	2.9V	2.7V	2.7V	6V	4.5V
Voltage - Supply (Max)	5.5V	4.5V	5.5V	5.5V	48V	40V
Voltage - Output	5.6V	5.3V	6.2V ~ 17.5V	3V ~ 24V	-	-
Current - Output / Channel	80mA	150mA	25mA	2.8A (Switch)	3A	-
Frequency	120kHz	1MHz	1.2MHz	525kHz	-	-
Package / Case	8-VSSOP, 8-MSOP	10-WFDFN Exposed Pad	6-UDFN Exposed Pad	6-WDFN Exposed Pad	8-SOIC Exposed Pad	8-SOIC
Operating Temperature	-25°C ~ 75°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Closest Functional Equivalent: The LTC3218EDDB#TRMPBF from Analog Devices Inc. provides the highest degree of substitution compatibility. Both the BD6155FVM-TR and LTC3218EDDB#TRMPBF employ switched capacitor (charge pump) topology, operate within overlapping supply voltage ranges (2.9V to 4.5V), and deliver comparable output voltages (5.6V vs. 5.3V). The LTC3218EDDB#TRMPBF offers 150mA output current, exceeding the 80mA requirement. This part is currently active and ROHS3 compliant with MSL rating of 1. Operating temperature range extends to -40°C to 85°C, providing broader environmental coverage than the original part.

Alternative Topologies for Extended Supply Range: The FAN5341UMPX (onsemi) and LM3410YSDE/NOPB (Texas Instruments) employ boost converter topologies, enabling operation across the full 2.7V to 5.5V supply range with programmable output voltages. Both parts are active, ROHS3 compliant, and rated for -40°C to 85°C or higher. These alternatives suit applications requiring wider input voltage flexibility or higher output current capability.

Higher Current Applications: The A6213KLJTR-T (Allegro MicroSystems) and LM3410YSDE/NOPB deliver significantly higher output currents (3A and 2.8A respectively), accommodating designs requiring increased LED drive capability. Both are active products with extended temperature ratings and automotive-grade qualifications where applicable.

Obsolete Part Consideration: The RT8476GS shares obsolete status with the BD6155FVM-TR and is not recommended as a primary substitute. Selection of active products ensures long-term supply chain viability and ongoing manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the LTC3218EDDB#TRMPBF directly replace the BD6155FVM-TR in existing designs?

A: The LTC3218EDDB#TRMPBF is functionally compatible as both employ switched capacitor topology and operate within overlapping voltage ranges. However, package differences (10-DFN vs. 8-MSOP) require PCB layout modification. Output voltage tolerance (5.3V vs. 5.6V) must be evaluated against application requirements. Verify dimming control compatibility, as the LTC3218EDDB#TRMPBF does not specify dimming capability.

Q: What is the primary difference between charge pump and boost converter topologies?

A: Charge pump (switched capacitor) regulators use capacitive energy transfer and are optimized for low-current, fixed output voltage applications with minimal external components. Boost converters use inductive energy storage and support programmable output voltages with higher current capability. The BD6155FVM-TR uses charge pump topology; boost alternatives (FAN5341UMPX, LM3410YSDE/NOPB) provide greater flexibility at the cost of increased component count.

Q: Are there package compatibility concerns when substituting parts?

A: Yes. The BD6155FVM-TR uses 8-MSOP packaging. Substitute parts employ different packages: LTC3218EDDB#TRMPBF (10-DFN), FAN5341UMPX (6-UDFN), LM3410YSDE/NOPB (6-WDFN), A6213KLJTR-T (8-SOIC), and RT8476GS (8-SOIC). Pin counts and footprints differ, requiring PCB redesign. Verify pinout compatibility and thermal pad requirements before layout implementation.

Q: Which substitute part offers the best supply voltage range compatibility?

A: The FAN5341UMPX and LM3410YSDE/NOPB both support 2.7V minimum input, matching the BD6155FVM-TR's 2.9V specification. The LTC3218EDDB#TRMPBF operates down to 2.9V. The A6213KLJTR-T requires minimum 6V input, limiting its applicability to higher voltage systems. The RT8476GS requires 4.5V minimum, reducing low-voltage compatibility.

Q: What compliance certifications should be verified for automotive or industrial applications?

A: All listed parts are ROHS3 compliant and REACH unaffected. The A6213KLJTR-T carries AEC-Q100 automotive qualification. The RT8476GS is designated for automotive applications. For commercial and industrial lighting, the MP4033GSE and MP4601EF-LF provide additional dimming options (analog, PWM, TRIAC) and extended temperature ratings. Verify specific application standards and regional compliance requirements before final selection.

Q: How does MSL (Moisture Sensitivity Level) affect component handling?

A: MSL 1 (unlimited shelf life) parts like the BD6155FVM-TR, LTC3218EDDB#TRMPBF, and FAN5341UMPX require no special moisture control during storage or handling. MSL 3 parts (A6213KLJTR-T, RT8476GS) require controlled humidity storage and have 168-hour floor life after moisture exposure. Verify storage conditions and reflow procedures align with MSL requirements to prevent solder joint failures.

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