LP8551TLE-A/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP8551TLE-A/NOPB is a 4-output LED Driver IC manufactured by Texas Instruments, functioning as a Step-Up (Boost) DC DC Regulator with integrated switching capability. This component is classified as a Power Management PMIC and is currently in Active product status with 1014 units in stock. The device supports I2C and PWM dimming control, operating across a 2.7V to 22V supply range with 40V output capability, and is designed for LED lighting applications. Substitute parts are necessary when addressing supply constraints, package compatibility requirements, or specific application demands that align with the electrical and mechanical parameters of this device category.

Substiute Parts

LP8551TLE-A/NOPB

Texas InstrumentsIn Stock: 1046LP8551TLE-A/NOPB Datasheet

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A8519KLPTR-T

Allegro MicroSystemsIn Stock: 2031A8519KLPTR-T Datasheet

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ISL97684IRTZ

Renesas Electronics CorporationIn Stock: 4238ISL97684IRTZ Datasheet

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ISL97692IRTZ-TK

Renesas Electronics CorporationIn Stock: 44249ISL97692IRTZ-TK Datasheet

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LT3599EFE#PBF

Analog Devices Inc.In Stock: 1940LT3599EFE#PBF Datasheet

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LT3599EUH#TRPBF

Analog Devices Inc.In Stock: 1949LT3599EUH#TRPBF Datasheet

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LT3599IFE#PBF

Analog Devices Inc.In Stock: 27339LT3599IFE#PBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP8551TLE-A/NOPB are selected based on strict alignment with the following critical parameters: 4-output configuration, Step-Up (Boost) topology with internal switching, supply voltage range compatibility, output voltage capability, dimming control methods (I2C and/or PWM), and surface mount packaging. All identified substitutes maintain the core functional architecture of a 4-output LED driver IC with boost regulation topology. Substitution validity is determined by whether the alternative part operates within the specified electrical envelope and supports equivalent control interfaces. Package form factor differences are noted but do not disqualify substitution when electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the LP8551TLE-A/NOPB. Selection among substitutes depends on specific application constraints:

A8519KLPTR-T (Allegro MicroSystems) operates within the 40V output specification and supports 4-output boost regulation with PWM dimming. This part qualifies for automotive applications under AEC-Q100 qualification and extends the operating temperature range to -40°C ~ 125°C. Package form factor is 20-TSSOP-EP, differing from the original 25-DSBGA.

ISL97684IRTZ (Renesas Electronics) provides 4-output boost regulation with 45V output capability and PWM dimming control. Operating temperature range is -40°C ~ 85°C. Package is 16-TQFN (3x3), representing a significant size reduction from the original part.

ISL97692IRTZ-TK (Renesas Electronics) operates at reduced supply voltage (2.4V minimum) and output voltage (26V maximum), limiting substitution to applications within this narrower envelope. This part is available in high inventory (44,200 units) and uses 16-TQFN (3x3) packaging.

LT3599EFE#PBF and LT3599IFE#PBF (Analog Devices Inc.) both provide 4-output boost regulation with 44V output capability, supporting both Analog and PWM dimming control. Operating temperature extends to -40°C ~ 125°C (TJ). Both use 28-TSSOP-EP packaging. LT3599IFE#PBF has significantly higher inventory (27,328 units).

LT3599EUH#TRPBF (Analog Devices Inc.) offers identical electrical specifications to the LT3599 series with 44V output and dual dimming control, packaged in 32-QFN (5x5) format with tape and reel packaging option.

Frequently Asked Questions (FAQ)

Q: Can the A8519KLPTR-T replace the LP8551TLE-A/NOPB in all applications?

A: The A8519KLPTR-T maintains 4-output boost regulation with 40V output and PWM dimming capability. However, it lacks I2C dimming control present in the original part. Substitution is valid only for applications using PWM dimming exclusively. The extended supply voltage range (4.5V to 40V maximum) differs from the original (2.7V to 22V), requiring verification that the application supply voltage falls within both ranges.

Q: What is the impact of package differences between substitutes?

A: Package form factor changes require PCB layout redesign. The original LP8551TLE-A/NOPB uses 25-DSBGA, while substitutes range from 16-TQFN to 32-QFN formats. Thermal performance, board space, and routing complexity differ significantly. Electrical functionality remains equivalent when parameters align.

Q: Which substitute offers the best inventory availability?

A: ISL97692IRTZ-TK provides the highest inventory level at 44,200 units. LT3599IFE#PBF offers 27,328 units. Both are suitable for high-volume production planning.

Q: Are all substitutes suitable for automotive applications?

A: Only A8519KLPTR-T carries AEC-Q100 qualification for automotive use. Other substitutes are not specified with automotive qualification and should not be selected for automotive applications without additional qualification review.

Q: What dimming control differences exist among substitutes?

A: The original LP8551TLE-A/NOPB supports both I2C and PWM dimming. Renesas ISL97684IRTZ and ISL97692IRTZ-TK support PWM only. Allegro A8519KLPTR-T supports Analog and PWM. Analog Devices LT3599 series supports Analog and PWM. Applications requiring I2C control cannot use Renesas or Allegro alternatives.

Q: How do output voltage specifications affect substitution?

A: The LP8551TLE-A/NOPB provides 40V output. ISL97684IRTZ reaches 45V, LT3599 series reaches 44V, and ISL97692IRTZ-TK is limited to 26V. Substitution is valid when the application output voltage requirement does not exceed the substitute's maximum rating. ISL97692IRTZ-TK is unsuitable for applications requiring output voltages above 26V.

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

A: LP8551TLE-A/NOPB carries MSL 1 (Unlimited shelf life). Most substitutes carry MSL 2 or MSL 3, requiring controlled storage conditions. MSL 3 parts (ISL97684IRTZ, ISL97692IRTZ-TK) have 168-hour floor life limits after moisture exposure.