LM27952SDX LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM27952SDX is a 4-output LED driver IC with integrated DC-DC regulator using switched capacitor (charge pump) topology for PWM dimming applications. Designed for backlight and LED driver applications, this component operates across a 3V to 5.5V supply range with 30mA per-channel output capability at 750kHz switching frequency.

The LM27952SDX is classified as obsolete. Equivalent and substitute parts are available from the same manufacturer family with identical or superior electrical and mechanical specifications, ensuring design continuity and supply chain flexibility.

Substiute Parts

LM27952SDX

Texas InstrumentsIn Stock: 23122LM27952SDX Datasheet

Current PartRFQ

LM27952SDX/NOPB

Texas InstrumentsIn Stock: 1511LM27952SDX/NOPB Datasheet

DirectRFQ

LM27951SD/NOPB

Texas InstrumentsIn Stock: 6268LM27951SD/NOPB Datasheet

Parametric EquivalentRFQ

LM27951SDX/NOPB

Texas InstrumentsIn Stock: 3296LM27951SDX/NOPB Datasheet

Parametric EquivalentRFQ

LM27952SD/NOPB

National SemiconductorIn Stock: 8348LM27952SD/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM27952SDX is determined by the following critical parameters:

• Electrical Compatibility: Identical supply voltage range (3V to 5.5V minimum), output voltage range (2.5V to 3.9V), current rating (30mA per channel), and switching frequency (750kHz)
• Functional Equivalence: 4-output configuration, switched capacitor topology, PWM dimming capability, and backlight application support
• Package Compatibility: 14-WFDFN Exposed Pad (14-WSON 4x3) surface mount package
• Mechanical Fit: Identical package dimensions and pin configuration

Substitute parts are classified into two categories:

1. Direct Manufacturer Substitutes: Parts with identical electrical specifications and active product status
2. Parametric Equivalents: Parts with compatible or superior electrical specifications from the same manufacturer family

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM27952SDX/NOPB

The LM27952SDX/NOPB is the direct manufacturer substitute with identical electrical and mechanical specifications. This part carries active product status and ROHS3 compliance, addressing the obsolescence of the original LM27952SDX. Pin-for-pin compatibility and functional equivalence ensure seamless integration into existing designs.

Secondary Recommendation: LM27951SD/NOPB or LM27951SDX/NOPB

The LM27951 series parts are parametric equivalents with extended minimum supply voltage capability (2.8V vs. 3V). These parts maintain all critical electrical parameters including 4-output configuration, 30mA per-channel current, 750kHz switching frequency, and PWM dimming control. Both variants carry active product status and ROHS3 compliance. The LM27951SDX/NOPB variant offers identical packaging to the original part.

Alternative Consideration: LM27952SD/NOPB

The LM27952SD/NOPB maintains electrical and mechanical compatibility with identical supply voltage range and output specifications. This part is available from National Semiconductor and carries active product status. Packaging and pin configuration remain consistent with the original design.

Frequently Asked Questions (FAQ)

Q: Can LM27951 series parts directly replace LM27952SDX in existing designs?

A: Yes. The LM27951SD/NOPB and LM27951SDX/NOPB maintain identical electrical specifications for supply voltage (within the 3V to 5.5V operating range), output voltage, current rating, switching frequency, and PWM dimming control. Package and pin configuration are identical. The extended minimum supply voltage (2.8V) of the LM27951 series provides additional design margin.

Q: What is the difference between LM27952SDX and LM27952SDX/NOPB?

A: The LM27952SDX/NOPB designation indicates a lead-free, halogen-free (NOPB) variant with ROHS3 compliance. Electrical and mechanical specifications are identical. The original LM27952SDX is RoHS non-compliant and obsolete, while LM27952SDX/NOPB carries active product status.

Q: Are there packaging differences between substitute parts?

A: All substitute parts listed maintain the 14-WFDFN Exposed Pad (14-WSON 4x3) surface mount package. Pin configuration, footprint, and mechanical dimensions are identical across all variants.

Q: Which substitute part offers the best supply voltage flexibility?

A: The LM27951 series (LM27951SD/NOPB and LM27951SDX/NOPB) extends the minimum supply voltage to 2.8V, compared to 3V for the LM27952 series. This provides additional operational margin in low-voltage applications while maintaining all other electrical specifications.

Q: What compliance certifications should I verify for new designs?

A: For new designs, specify parts with ROHS3 compliance and MSL 1 rating. The LM27952SDX/NOPB, LM27951SD/NOPB, and LM27951SDX/NOPB all meet these requirements. Verify REACH and ECCN compliance with your procurement department for your specific application and region.