MC34845CEPR2 Equivalent & Substitute Parts

Part Overview

The MC34845CEPR2 is a LED Driver IC with 6 outputs, featuring a DC DC Step-Up (Boost) regulator topology with PWM dimming capability. Manufactured by NXP USA Inc., this device delivers 2.3A switch current and operates across a 5V to 21V supply range with output voltage capability of 8V to 60V. The part is designed for backlight applications and is housed in a 24-QFN-EP (4x4) package.

The MC34845CEPR2 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	MC34845CEPR2
Manufacturer	NXP USA Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	6
Voltage Supply (Min)	5V
Voltage Supply (Max)	21V
Voltage Output	8V ~ 60V
Current Output / Channel	2.3A (Switch)
Frequency	600kHz
Dimming	PWM
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	24-UFQFN Exposed Pad
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MC34845CEPR2 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC DC Regulator
Number of Outputs: 6 outputs (primary requirement)
Dimming Capability: PWM dimming support
Supply Voltage Range: Overlap with 5V to 21V input specification
Output Voltage Range: Capability to reach 8V to 60V output
Package Type: Surface mount QFN or BGA variants
Compliance: ROHS3 compliant

Secondary Compatibility Factors:

Operating temperature range (-40°C to 85°C preferred)
Internal switch presence for integrated power delivery
Application alignment: Backlight LED driver functionality

The substitute parts listed below maintain the core functional requirements of the MC34845CEPR2 while offering active product status and improved availability. Variations in current output per channel, package dimensions, and frequency specifications are noted but do not preclude functional substitution when circuit design accommodates these differences.

Parameter Comparison

Parameter	MC34845CEPR2	ISL78171ARZ-T7A	ISL97694AIRTZ-TK	LP8552TLE-E04/NOPB	LP8556SQ-E09/NOPB	LP8556SQX-E00/NOPB	LP8556TME-E05/NOPB	MPQ3386DR-LF-Z	MPQ3387LGRT-P	TPS61181ARTER	TPS61181RTER
Manufacturer	NXP USA Inc.	Renesas Electronics	Renesas Electronics	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Monolithic Power Systems	Monolithic Power Systems	Texas Instruments	Texas Instruments
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	6	6	6	6	6	5	6	6	6	6	6
Voltage Supply (Min)	5V	4.5V	2.4V	2.7V	2.7V	2.7V	2.7V	4.5V	3V	4.5V	5V
Voltage Supply (Max)	21V	26.5V	5.5V	22V	20V	20V	20V	25V	25V	24V	24V
Voltage Output	8V ~ 60V	40V	26V	40V	7V ~ 43V	7V ~ 43V	7V ~ 43V	50V	45V	38V	38V
Current Output / Channel	2.3A (Switch)	50mA	30mA	450mA	50mA	50mA	50mA	-	45mA	30mA	25mA
Frequency	600kHz	600kHz, 1.2MHz	400kHz ~ 1.5MHz	-	312kHz, 625kHz, 1250kHz	312kHz, 625kHz, 1250kHz	312kHz, 625kHz, 1250kHz	1.25MHz	24kHz ~ 27.5kHz	1MHz	1MHz
Dimming	PWM	Analog, I2C, PWM	PWM	PWM	PWM	PWM	-	PWM	Analog, PWM	PWM	PWM
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-30°C ~ 85°C (TA)	-30°C ~ 85°C (TA)	-30°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	24-UFQFN Exposed Pad	20-VFQFN Exposed Pad	20-VFQFN Exposed Pad	25-WFBGA, DSBGA	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	20-WFBGA, DSBGA	24-VFQFN Exposed Pad	24-WFQFN Exposed Pad	16-WFQFN Exposed Pad	16-WFQFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status, ensuring long-term availability and supply chain continuity compared to the obsolete MC34845CEPR2. All candidates are ROHS3 compliant and meet the same environmental and regulatory requirements.

Primary Substitutes (Highest Compatibility):

LP8556SQ-E09/NOPB and LP8556SQX-E00/NOPB represent the closest functional alignment, offering 6-output Step-Up topology with PWM dimming in 24-pin QFN packages. LP8556SQ-E09/NOPB maintains 6 outputs with output voltage range of 7V to 43V, while LP8556SQX-E00/NOPB provides 5 outputs. Both support multiple frequency options and are actively produced by Texas Instruments.

LP8552TLE-E04/NOPB offers higher current capability (450mA per channel) in a 25-DSBGA package, suitable for applications requiring increased power delivery within the 2.7V to 22V supply range and 40V maximum output.

Secondary Substitutes (Functional Equivalence with Design Considerations):

ISL78171ARZ-T7A (Renesas) and ISL97694AIRTZ-TK (Renesas) provide 6-output Step-Up regulation with PWM dimming. ISL78171ARZ-T7A extends operating temperature to 105°C and includes automotive qualification (AEC-Q100). ISL97694AIRTZ-TK operates from lower supply voltages (2.4V minimum) but limits output to 26V.

MPQ3386DR-LF-Z and MPQ3387LGRT-P (Monolithic Power Systems) both include automotive qualification and extended temperature ranges. MPQ3386DR-LF-Z operates to 125°C junction temperature. MPQ3387LGRT-P supports analog and PWM dimming with lower frequency operation (24kHz to 27.5kHz).

TPS61181ARTER and TPS61181RTER (Texas Instruments) provide 6-output Step-Up regulation in compact 16-pin QFN packages with PWM dimming, though with reduced current per channel (30mA and 25mA respectively) and lower maximum output voltage (38V).

Design Transition Notes:

Current output per channel varies significantly across substitutes. Applications designed for the MC34845CEPR2's 2.3A switch current must evaluate whether substitute parts with lower per-channel current (25mA to 450mA range) meet load requirements or require circuit topology modifications.

Output voltage ranges differ across candidates. Designs requiring the full 8V to 60V output capability of the MC34845CEPR2 should prioritize LP8556 variants (7V to 43V) or MPQ3386DR-LF-Z (50V maximum).

Package transitions from 24-UFQFN to alternative QFN, BGA, or DSBGA formats require PCB layout re-evaluation and thermal management assessment.

Frequently Asked Questions (FAQ)

Q: Can LP8556SQ-E09/NOPB directly replace MC34845CEPR2 in existing designs?

A: LP8556SQ-E09/NOPB maintains 6-output Step-Up topology with PWM dimming and operates within overlapping supply voltage ranges (2.7V to 20V vs. 5V to 21V). However, output voltage capability is limited to 7V to 43V compared to the MC34845CEPR2's 8V to 60V range. Current per channel is significantly lower (50mA vs. 2.3A switch current). PCB layout changes are required due to package differences (24-WQFN vs. 24-UFQFN). Circuit validation is necessary to confirm compatibility with specific load requirements.

Q: Why do substitute parts show lower current ratings than the MC34845CEPR2?

A: The MC34845CEPR2 specifies 2.3A switch current, which represents the internal switching element capability rather than per-channel output current. Substitute parts list per-channel output current (25mA to 450mA), which reflects the maximum continuous current delivered to individual LED strings. These are different specifications. Applications must evaluate total power delivery requirements against substitute part capabilities.

Q: Which substitute offers the best temperature performance?

A: MPQ3386DR-LF-Z operates to 125°C junction temperature (TJ) and includes automotive qualification (AEC-Q100). ISL78171ARZ-T7A extends ambient temperature operation to 105°C (TA) and also carries AEC-Q100 qualification. Both exceed the MC34845CEPR2's -40°C to 85°C range. Selection depends on whether junction or ambient temperature specification is critical for the application.

Q: Are all substitutes automotive-qualified?

A: No. ISL78171ARZ-T7A, MPQ3386DR-LF-Z, and MPQ3387LGRT-P carry AEC-Q100 automotive qualification. Remaining substitutes are industrial-grade components. Automotive applications must select from qualified alternatives.

Q: What package considerations apply when transitioning from MC34845CEPR2?

A: The MC34845CEPR2 uses 24-UFQFN (4x4) packaging. Substitutes employ 24-WQFN, 24-VFQFN, 20-QFN, 16-WQFN, 25-DSBGA, or 20-DSBGA packages. Each package variant has different footprint dimensions, thermal characteristics, and PCB routing requirements. BGA packages (DSBGA) require via-in-pad design considerations. QFN packages with exposed pads require thermal vias for heat dissipation. Layout re-qualification is mandatory.

Q: Do all substitutes support PWM dimming?

A: Most substitutes support PWM dimming. LP8556TME-E05/NOPB does not specify dimming capability. ISL78171ARZ-T7A and MPQ3387LGRT-P support both analog and PWM dimming, offering additional control flexibility. Verify dimming method compatibility with existing control circuitry.

Q: Which substitute best matches the MC34845CEPR2's output voltage range?

A: No substitute fully matches the 8V to 60V output range. MPQ3386DR-LF-Z reaches 50V maximum output. LP8556 variants (SQ-E09, SQX-E00, TME-E05) provide 7V to 43V output. ISL78171ARZ-T7A is limited to 40V. Applications requiring output voltages above 43V must evaluate circuit modifications or alternative topologies.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the MC34845CEPR2's environmental compliance status.

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