LP8551TLX-B Equivalent & Substitute Parts

Part Overview

The LP8551TLX-B is an active LED Driver IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device functions as a 4-output DC-DC regulator with step-up (boost) topology, designed for LED lighting applications. The part integrates an internal switch and supports both I2C and PWM dimming control methods, operating across a supply voltage range of 2.7V to 22V with a maximum output voltage of 40V.

The LP8551TLX-B is currently in active product status with 12,300 units available in inventory. Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements such as alternative packaging formats, operating temperature ranges, or automotive qualification levels.

Substiute Parts

LP8551TLX-B

Texas InstrumentsIn Stock: 12363LP8551TLX-B Datasheet

Current PartRFQ

A8514KLPTR-T

Allegro MicroSystemsIn Stock: 25598A8514KLPTR-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP8551TLX-B are identified based on functional equivalence within the LED driver IC category. The substitution logic is strictly based on the following key parameters:

Functional Equivalence Criteria:

• Device Type: DC-DC Regulator with step-up (boost) topology
• Output Configuration: 4-output LED driver
• Internal Switch: Integrated switching element
• Dimming Control: PWM capability (primary control method for LED applications)
• Applications: LED lighting or backlight control

Allowed Parameter Variations:

• Supply voltage range may differ (substitute may have different Min/Max specifications)
• Output voltage specification may be unspecified in substitute
• Current output per channel may be specified differently
• Operating frequency range may vary
• Operating temperature range may extend beyond the main part
• Package format may differ (alternative surface-mount packages acceptable)
• Automotive qualification and AEC-Q100 certification are additional qualifications, not disqualifying factors

The A8514KLPTR-T qualifies as a substitute based on matching functional topology (4-output boost regulator with PWM dimming), internal switch integration, and surface-mount configuration. Differences in supply voltage range, package type, and automotive qualification represent acceptable variations for substitute classification.

Parameter Comparison

Engineering Selection Recommendations

Main Part Selection (LP8551TLX-B):

• Select when I2C dimming control is required for advanced LED driver functionality
• Preferred for applications requiring lower minimum supply voltage (2.7V)
• Suitable for designs with space constraints favoring BGA packaging
• Appropriate for consumer-grade LED lighting applications
• Product status: Active with established supply (12,300 units in stock)

Substitute Part Selection (A8514KLPTR-T):

• Select when PWM-only dimming control is acceptable
• Preferred for automotive applications requiring AEC-Q100 qualification
• Suitable for designs requiring extended operating temperature range (-40°C to 125°C)
• Appropriate for backlight applications with specified 80mA per-channel current
• Preferred when TSSOP packaging is compatible with board layout
• Product status: Active with higher inventory availability (25,584 units in stock)
• Acceptable for designs where minimum supply voltage of 5V is compatible

Both parts maintain ROHS3 compliance and active product status, supporting long-term design viability.

Frequently Asked Questions (FAQ)

Q: Can the A8514KLPTR-T directly replace the LP8551TLX-B in an existing design?

A: Direct replacement requires verification of three factors: (1) Supply voltage compatibility—the A8514KLPTR-T requires minimum 5V input versus 2.7V for the LP8551TLX-B; (2) Dimming control method—the A8514KLPTR-T supports PWM only, while the LP8551TLX-B supports both I2C and PWM; (3) Package compatibility—the A8514KLPTR-T uses 20-TSSOP-EP versus 25-DSBGA for the main part, requiring PCB layout modification.

Q: What are the key differences in operating temperature ranges?

A: The LP8551TLX-B operates from -30°C to 85°C, while the A8514KLPTR-T operates from -40°C to 125°C. The substitute part provides extended low-temperature performance and higher maximum operating temperature, making it suitable for automotive and industrial environments requiring AEC-Q100 qualification.

Q: How do the supply voltage ranges differ between these parts?

A: The LP8551TLX-B accepts input voltage from 2.7V to 22V, while the A8514KLPTR-T requires 5V to 40V input. Applications using battery-powered or low-voltage sources below 5V must use the LP8551TLX-B. The A8514KLPTR-T accommodates higher input voltages up to 40V.

Q: What is the significance of the MSL (Moisture Sensitivity Level) difference?

A: The LP8551TLX-B has MSL 1 (unlimited shelf life without baking), while the A8514KLPTR-T has MSL 2 (1-year shelf life requiring baking before reflow if stored longer). This affects component handling and storage procedures in manufacturing environments.

Q: Are both parts suitable for LED lighting applications?

A: Both parts function as 4-output LED drivers with boost topology. The LP8551TLX-B is specified for LED Lighting applications, while the A8514KLPTR-T is specified for Backlight applications. Both support PWM dimming control for LED current regulation. Application-specific requirements should determine final selection.

Q: What packaging considerations apply when substituting?

A: The LP8551TLX-B uses 25-DSBGA (ball grid array) packaging, while the A8514KLPTR-T uses 20-TSSOP-EP (thin shrink small outline package with exposed pad). BGA packages require different PCB design, assembly equipment, and inspection methods compared to TSSOP packages. PCB layout and manufacturing capability must be evaluated before substitution.

Q: Does the A8514KLPTR-T's AEC-Q100 qualification affect its use in non-automotive applications?

A: No. AEC-Q100 qualification is an additional qualification that does not restrict use in non-automotive applications. It indicates the part meets automotive reliability standards and can be used in any application where those reliability levels are acceptable or required.