LP8550TLX-A/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP8550TLX-A/NOPB is a 6-output LED driver IC manufactured by Texas Instruments, designed for backlight and lighting applications. This step-up (boost) DC-DC regulator operates with PWM dimming control and delivers 450mA per channel output current. The device is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when design requirements allow for variations in output channel count, current delivery per channel, package form factor, or frequency characteristics, while maintaining core functional compatibility for LED driver applications.

Substiute Parts

LP8550TLX-A/NOPB

Texas InstrumentsIn Stock: 752LP8550TLX-A/NOPB Datasheet

Current PartRFQ

LP8551TLX-A/NOPB

Texas InstrumentsIn Stock: 848LP8551TLX-A/NOPB Datasheet

Parametric EquivalentRFQ

LT3598EFE#PBF

Analog Devices Inc.In Stock: 2298LT3598EFE#PBF Datasheet

MFR RecommendedRFQ

LT3598EUF#PBF

Analog Devices Inc.In Stock: 3751LT3598EUF#PBF Datasheet

MFR RecommendedRFQ

LT3598IFE#TRPBF

Analog Devices Inc.In Stock: 2206LT3598IFE#TRPBF Datasheet

MFR RecommendedRFQ

MP3387AGRT-Z

Monolithic Power Systems Inc.In Stock: 3025MP3387AGRT-Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP8550TLX-A/NOPB are classified into two categories based on allowed parameter variations:

Parametric Equivalent (Same Manufacturer): LP8551TLX-A/NOPB qualifies as a parametric equivalent when the design allows reduction from 6 outputs to 4 outputs. All other critical parameters remain identical: same supply voltage range (2.7V–22V), output voltage (40V), per-channel current (450mA), switching frequency (1.25MHz), PWM dimming, package type (25-DSBGA), and operating temperature range (-30°C to 85°C).

Manufacturer Recommended Alternatives (Cross-Manufacturer): LT3598EFE#PBF, LT3598EUF#PBF, and LT3598IFE#TRPBF (Analog Devices Inc.) and MP3387AGRT-Z (Monolithic Power Systems Inc.) are qualified substitutes when designs can accommodate:

• Different package form factors (24-TSSOP or 24-QFN instead of 25-DSBGA)
• Extended supply voltage range (3V–30V vs. 2.7V–22V)
• Higher output voltage capability (44V vs. 40V)
• Reduced per-channel current (30mA vs. 450mA)
• Wider frequency range (200kHz–2.5MHz vs. fixed 1.25MHz)
• Extended operating temperature range (-40°C to 125°C vs. -30°C to 85°C)
• Dual dimming capability (Analog and PWM for LT3598 series)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Functionality): LP8551TLX-A/NOPB is suitable when the application design permits reduction from 6 LED driver outputs to 4 outputs. This part maintains identical electrical performance, package footprint (25-DSBGA), and thermal characteristics. Both parts carry ROHS3 compliance and active product status.

For Alternative Topology Designs: LT3598 series parts (LT3598EFE#PBF, LT3598EUF#PBF, LT3598IFE#TRPBF) are suitable when PCB layout constraints require different package options (24-TSSOP or 24-QFN) and when application current requirements are lower (30mA per channel vs. 450mA). These parts support dual dimming modes (analog and PWM) and extended operating temperature range (-40°C to 125°C). All variants maintain ROHS3 compliance and active production status.

For Monolithic Power Systems Alternative: MP3387AGRT-Z is suitable when design flexibility allows for a different manufacturer platform with 24-TQFN packaging. This part maintains ROHS3 compliance and active product status.

All substitute parts listed carry ROHS3 compliance, MSL 1 rating, and active product status, confirming suitability for new designs and ongoing production applications.

Frequently Asked Questions (FAQ)

Q: Can LP8551TLX-A/NOPB replace LP8550TLX-A/NOPB in existing designs? A: LP8551TLX-A/NOPB is a parametric equivalent suitable for replacement only when the application design allows reduction from 6 LED driver outputs to 4 outputs. All other electrical and thermal parameters are identical. The package footprint (25-DSBGA) remains unchanged, allowing direct PCB substitution.

Q: What are the key differences between LP8550TLX-A/NOPB and LT3598 series parts? A: The primary differences are package type (25-DSBGA vs. 24-TSSOP or 24-QFN), per-channel current capacity (450mA vs. 30mA), supply voltage range (2.7V–22V vs. 3V–30V), and dimming control options (PWM only vs. analog and PWM). LT3598 series also supports extended operating temperature range (-40°C to 125°C vs. -30°C to 85°C).

Q: Are all substitute parts ROHS3 compliant? A: Yes. All parts listed—LP8551TLX-A/NOPB, LT3598EFE#PBF, LT3598EUF#PBF, LT3598IFE#TRPBF, and MP3387AGRT-Z—carry ROHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating.

Q: Which substitute part requires the least PCB redesign? A: LP8551TLX-A/NOPB requires no PCB redesign, as it uses the identical 25-DSBGA package and pinout. Substitution is limited only by the reduction from 6 to 4 output channels.

Q: Can LT3598 parts be used in high-current LED driver applications? A: LT3598 series parts deliver 30mA per channel, significantly lower than the LP8550TLX-A/NOPB (450mA per channel). These parts are suitable for lower-current LED applications or designs where multiple channels are paralleled. High-current applications requiring 450mA per channel should remain with LP8550TLX-A/NOPB or LP8551TLX-A/NOPB.

Q: What is the operating temperature difference between LP8550TLX-A/NOPB and LT3598 series? A: LP8550TLX-A/NOPB operates from -30°C to 85°C (ambient temperature). LT3598 series parts operate from -40°C to 125°C (junction temperature), providing extended low-temperature and high-temperature capability for demanding thermal environments.

Q: Are packaging options interchangeable between substitute parts? A: No. LP8550TLX-A/NOPB and LP8551TLX-A/NOPB use 25-DSBGA packaging. LT3598 series uses either 24-TSSOP or 24-QFN (4x4) packaging. MP3387AGRT-Z uses 24-TQFN (4x4) packaging. Each package type requires different PCB footprints and layout considerations.