LM27965SQ LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM27965SQ is a LED Driver IC manufactured by Texas Instruments, designed for backlight applications. This device functions as a 9-output DC-DC regulator utilizing switched capacitor (charge pump) topology with I2C-based dimming control. The main part number LM27965SQ is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and procurement planning. Active alternatives with identical or compatible electrical specifications are available from the same manufacturer.

Substiute Parts

LM27965SQ

Texas InstrumentsIn Stock: 2471LM27965SQ Datasheet

Current PartRFQ

LM27965SQ/NOPB

Texas InstrumentsIn Stock: 16321LM27965SQ/NOPB Datasheet

DirectRFQ

LM27965SQ-M/NOPB

National SemiconductorIn Stock: 9781LM27965SQ-M/NOPB Datasheet

Parametric EquivalentRFQ

LM27965SQX/NOPB

Texas InstrumentsIn Stock: 4597LM27965SQX/NOPB Datasheet

Parametric EquivalentRFQ

LM27966SQ/NOPB

Texas InstrumentsIn Stock: 1485LM27966SQ/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM27965SQ is determined by the following critical parameters:

• Number of Outputs: Must be 9 outputs for direct functional replacement
• Voltage Supply Range: Must support 2.7V to 5.5V input
• Output Voltage Range: Must support 2V to 4V output
• Current per Channel: Must support 30mA per output
• Switching Frequency: Must operate at 1.27MHz
• Dimming Control: Must support I2C interface
• Package Type: Must be 24-WQFN with exposed pad
• Topology: Must use switched capacitor (charge pump) topology

Parts are classified into two substitution categories:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications with differences only in packaging format (Tape & Reel vs. Bulk) or product status (Active vs. Obsolete).

Parametric Equivalents maintain all critical electrical parameters but may differ in specific package dimensions, output count, or compliance certifications while remaining functionally compatible for the intended application.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM27965SQ/NOPB

This part is the direct active equivalent of the obsolete LM27965SQ. It maintains identical electrical specifications and package dimensions while offering ROHS3 compliance and active product status. The only difference is packaging format (Tape & Reel vs. Bulk), which does not affect electrical performance. This is the preferred choice for new designs and production procurement.

Secondary Recommendation: LM27965SQX/NOPB

This variant maintains all critical electrical parameters and offers active status with ROHS3 compliance. The package dimension differs slightly (4x5 vs. 4x4), which may require PCB layout verification but does not affect electrical functionality. This option is suitable when the specific package footprint is compatible with existing designs.

Alternative: LM27965SQ-M/NOPB

Manufactured by National Semiconductor, this part provides identical electrical specifications and bulk packaging format. Active product status ensures long-term availability. Compliance certifications are not specified in available documentation. This option is viable when supply from Texas Instruments is constrained.

Not Recommended for Direct Substitution: LM27966SQ/NOPB

While this part shares identical electrical characteristics and topology, it provides only 6 outputs instead of 9. This part is suitable only for applications requiring fewer LED channels and should not be used as a direct replacement for 9-output designs.

Frequently Asked Questions (FAQ)

Q: Can LM27965SQ/NOPB be used as a direct replacement for the obsolete LM27965SQ?

A: Yes. LM27965SQ/NOPB is electrically and mechanically identical to the obsolete part. The only difference is packaging format (Tape & Reel vs. Bulk). Both use the same 24-WQFN (4x4) package and maintain identical electrical specifications.

Q: What is the difference between LM27965SQX/NOPB and LM27965SQ/NOPB?

A: Both parts are electrically identical with 9 outputs, identical voltage ranges, and 1.27MHz switching frequency. The difference is package dimension: LM27965SQX/NOPB uses 24-WQFN (4x5) while LM27965SQ/NOPB uses 24-WQFN (4x4). PCB layout compatibility must be verified before substitution.

Q: Why is LM27966SQ/NOPB listed as a substitute if it has only 6 outputs?

A: LM27966SQ/NOPB is a parametric equivalent sharing identical electrical specifications, topology, and package type. It is suitable only for applications requiring 6 LED channels. For designs requiring 9 outputs, this part is not compatible.

Q: Are all substitute parts ROHS3 compliant?

A: LM27965SQ/NOPB and LM27965SQX/NOPB are ROHS3 compliant. LM27965SQ-M/NOPB compliance status is not specified in available documentation. The original obsolete LM27965SQ is non-compliant.

Q: Can I use LM27965SQ-M/NOPB from National Semiconductor instead of the Texas Instruments version?

A: Yes, provided compliance certifications meet your application requirements. LM27965SQ-M/NOPB maintains identical electrical specifications and 24-WQFN (4x4) package. Verify that National Semiconductor's product documentation aligns with your design requirements before implementation.

Q: What inventory levels are available for each substitute?

A: LM27965SQ/NOPB has 16,300 units in stock. LM27965SQX/NOPB has 4,534 units. LM27965SQ-M/NOPB has 9,700 units. LM27966SQ/NOPB has 1,395 units. Verify current availability with your supplier before finalizing procurement decisions.