LP8550TLX/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP8550TLX/NOPB is an active, production-status LED driver IC manufactured by Texas Instruments, designed for high-efficiency backlight applications. This 6-output DC-DC regulator operates as a step-up (boost) converter with PWM dimming capability, delivering 50mA per channel at up to 40V output. The device is packaged in a 25-pin wafer-level ball grid array (25-WFBGA) in tape & reel format and maintains full RoHS3 compliance with MSL Level 1 (unlimited moisture sensitivity).

Equivalent and substitute parts are identified when design requirements necessitate alternative packaging formats, different supply voltage ranges, or alternative sourcing due to inventory constraints while maintaining functional compatibility for LED backlight driver applications.

Substiute Parts

LP8550TLX/NOPB

Texas InstrumentsIn Stock: 4925LP8550TLX/NOPB Datasheet

Current PartRFQ

LP8550TLE/NOPB

National SemiconductorIn Stock: 2230LP8550TLE/NOPB Datasheet

Parametric EquivalentRFQ

ISL97671AIRZ

Renesas Electronics CorporationIn Stock: 23430ISL97671AIRZ Datasheet

MFR RecommendedRFQ

MP3387LGRT-P

Monolithic Power SystemsIn Stock: 1490MP3387LGRT-P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP8550TLX/NOPB are qualified based on the following critical parameters that define functional equivalence for LED backlight driver applications:

• Topology: Step-up (boost) DC-DC converter with internal switching capability
• Output Configuration: 6 independent LED driver outputs
• Dimming Method: PWM-based brightness control
• Supply Voltage Compatibility: Minimum 2.7V input capability for low-battery operation
• Output Voltage Capability: Minimum 40V output for LED string driving
• Current Rating: 50mA per channel for standard LED backlight loads
• Mounting Technology: Surface mount packages suitable for automated assembly
• Compliance: RoHS3 and REACH compliance for regulated markets

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications with different packaging) and manufacturer-recommended alternatives (functionally compatible with minor parameter variations).

Parameter Comparison

Engineering Selection Recommendations

LP8550TLE/NOPB (Parametric Equivalent)

This part is a direct parametric equivalent to the LP8550TLX/NOPB, sharing identical electrical specifications and the same 25-WFBGA package. The primary difference is packaging format (bulk versus tape & reel). Selection is appropriate when tape & reel format is not required or when bulk packaging offers supply or cost advantages. Both parts maintain active production status and identical operating parameters.

ISL97671AIRZ (Manufacturer-Recommended Alternative)

This Renesas Electronics part provides functional compatibility with the following considerations: supply voltage range extends to 4.5V minimum (versus 2.7V) and 26.5V maximum (versus 22V), and output voltage capability reaches 45V (versus 40V). The package format changes to 20-VFQFN, reducing board footprint. Operating temperature range extends to -40°C. MSL rating is 3 (168 hours), requiring controlled storage conditions. Selection is appropriate for applications with higher supply voltage availability and where reduced package size is beneficial.

MP3387LGRT-P (Manufacturer-Recommended Alternative)

This Monolithic Power Systems part offers extended operating temperature range (-40°C to 125°C junction temperature) and dual dimming capability (analog and PWM). Supply voltage range is 3V to 25V. Current per channel is rated at 45mA (versus 50mA). Package format is 24-WFQFN. MSL rating is 1 (unlimited). Selection is appropriate for applications requiring higher temperature operation or where analog dimming control provides design advantages.

All substitute parts maintain RoHS3 compliance, REACH compliance, and active production status, ensuring regulatory compliance and long-term availability for LED backlight driver applications.

Frequently Asked Questions (FAQ)

Q: Can LP8550TLE/NOPB be used as a direct replacement for LP8550TLX/NOPB?

A: Yes. Both parts are parametrically identical with matching electrical specifications, operating temperature range, and package type (25-WFBGA). The difference is packaging format: LP8550TLX/NOPB is supplied in tape & reel format, while LP8550TLE/NOPB is supplied in bulk. PCB layout and design remain unchanged.

Q: What are the key differences between ISL97671AIRZ and the LP8550TLX/NOPB?

A: The ISL97671AIRZ has a higher minimum supply voltage (4.5V versus 2.7V), extended maximum supply voltage (26.5V versus 22V), higher output voltage capability (45V versus 40V), and a different package format (20-VFQFN versus 25-WFBGA). Operating temperature extends to -40°C. MSL rating is 3, requiring controlled storage. These differences may affect PCB layout and thermal management.

Q: Is MP3387LGRT-P suitable for applications requiring 50mA per channel?

A: The MP3387LGRT-P is rated at 45mA per channel, which is 5mA lower than the LP8550TLX/NOPB. For applications requiring the full 50mA specification, verify that 45mA per channel meets load requirements. The part offers extended temperature operation (-40°C to 125°C) and dual dimming control (analog and PWM).

Q: What packaging considerations apply when switching from LP8550TLX/NOPB to ISL97671AIRZ?

A: The ISL97671AIRZ uses a 20-VFQFN package versus the 25-WFBGA package of the LP8550TLX/NOPB. This represents a significant footprint reduction and requires PCB layout redesign. Pin assignments and signal routing will differ. Thermal characteristics and via placement strategies may also require adjustment.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LP8550TLE/NOPB, ISL97671AIRZ, and MP3387LGRT-P are all RoHS3 compliant. All parts are REACH compliant and classified as EAR99 for export control purposes.

Q: Which substitute part has the best moisture sensitivity rating?

A: Both LP8550TLE/NOPB and MP3387LGRT-P have MSL Level 1 (unlimited moisture sensitivity), requiring no special storage conditions. ISL97671AIRZ has MSL Level 3 (168 hours), requiring controlled humidity storage and bake-out procedures before reflow soldering.