LM2754SQ LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM2754SQ is a 4-output LED driver IC manufactured by Texas Instruments, utilizing switched capacitor (charge pump) topology for camera flash applications. This device operates with a 200mA flash current capability and is housed in a 24-WQFN package. The LM2754SQ is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across power supply voltage ranges, output voltage specifications, and thermal operating conditions while accommodating packaging and topology variations.

Substiute Parts

LM2754SQ

Texas InstrumentsIn Stock: 9356LM2754SQ Datasheet

Current PartRFQ

LM2754SQ/NOPB

Texas InstrumentsIn Stock: 1597LM2754SQ/NOPB Datasheet

DirectRFQ

LT3599IUH#PBF

Analog Devices Inc.In Stock: 1402LT3599IUH#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2754SQ are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Number of outputs: 4 channels required
• Supply voltage range: Minimum 2.8V input capability
• Output voltage capability: Ability to generate 4.7V ~ 5.1V
• Current capacity: Minimum 200mA per channel for flash applications
• Mounting type: Surface mount configuration
• Internal switching capability: Integrated switch(es) required

Substitution Categories:

Direct Equivalent (Same Topology): LM2754SQ/NOPB maintains identical electrical specifications, topology (switched capacitor charge pump), and package configuration. This part is functionally interchangeable with the obsolete LM2754SQ, with the primary distinction being product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard).

Functional Equivalent (Alternative Topology): LT3599IUH#PBF provides 4-output LED driver functionality with different topology (Step-Up Boost) and package size (32-QFN vs. 24-WQFN). This substitute accommodates wider supply voltage ranges and higher operating temperatures but operates at reduced per-channel current (120mA vs. 200mA) and requires design-level integration considerations due to topology differences.

Parameter Comparison

Engineering Selection Recommendations

LM2754SQ/NOPB (Direct Substitute - Recommended for Pin-Compatible Replacement)

The LM2754SQ/NOPB is the primary substitute for obsolete LM2754SQ applications. This part maintains identical electrical specifications, topology, and package footprint, enabling direct board-level substitution without circuit redesign. The LM2754SQ/NOPB is classified as Active product status, ensuring long-term availability and supply chain continuity. This part achieves ROHS3 compliance, meeting current regulatory requirements for new designs and production. The packaging format difference (Tape & Reel vs. standard) does not affect electrical performance or PCB integration.

LT3599IUH#PBF (Functional Substitute - For Design Flexibility)

The LT3599IUH#PBF serves as a functional equivalent for applications requiring extended supply voltage range (up to 30V) or higher operating temperature capability (up to 125°C junction temperature). This substitute employs Step-Up (Boost) topology rather than switched capacitor charge pump, requiring circuit-level design modifications. The reduced per-channel current specification (120mA vs. 200mA) necessitates application review for flash current requirements. The larger package footprint (32-QFN vs. 24-WQFN) requires PCB layout changes. This part is Active status and ROHS3 compliant. Selection of this substitute is appropriate only when design specifications explicitly require the extended operating parameters provided by the LT3599IUH#PBF topology and voltage range.

Frequently Asked Questions (FAQ)

Q: Can LM2754SQ/NOPB be used as a direct replacement for LM2754SQ?

A: Yes. The LM2754SQ/NOPB is electrically and functionally identical to the LM2754SQ. Both parts share the same topology (switched capacitor charge pump), output configuration (4 channels), voltage specifications (2.8V ~ 5.5V supply, 4.7V ~ 5.1V output), current rating (200mA flash), and package footprint (24-WFQFN). The primary differences are product status (Active vs. Obsolete) and packaging format (Tape & Reel). No circuit modifications are required.

Q: What are the key differences between LM2754SQ and LT3599IUH#PBF?

A: The LT3599IUH#PBF differs in three critical areas: (1) Topology—Step-Up Boost vs. Switched Capacitor Charge Pump, requiring different circuit design; (2) Current capacity—120mA per channel vs. 200mA, limiting flash current capability; (3) Package size—32-QFN (5x5) vs. 24-WQFN (4x4), requiring PCB layout redesign. The LT3599IUH#PBF provides extended supply voltage range (up to 30V) and higher operating temperature (up to 125°C), which may be beneficial for specific applications.

Q: Is the LM2754SQ/NOPB packaging difference significant?

A: No. The packaging format difference (Tape & Reel vs. standard) affects only supply chain logistics and handling procedures. Electrical performance, PCB footprint, and functional characteristics remain identical. Tape & Reel packaging is standard for high-volume production and does not impact component selection or circuit design.

Q: Can LT3599IUH#PBF replace LM2754SQ in existing designs without modification?

A: No. The LT3599IUH#PBF requires circuit-level design modifications due to topology differences (Step-Up Boost vs. Switched Capacitor Charge Pump), reduced per-channel current (120mA vs. 200mA), and different package footprint (32-QFN vs. 24-WQFN). Design review and validation are necessary before implementation.

Q: What compliance advantages does LM2754SQ/NOPB provide?

A: The LM2754SQ/NOPB achieves ROHS3 compliance, meeting current regulatory requirements for electronic components in regulated markets. The obsolete LM2754SQ is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

Q: Are there inventory considerations for substitute selection?

A: Yes. The LM2754SQ/NOPB (1550 Pcs in stock) provides active product status with ongoing availability. The LT3599IUH#PBF (1355 Pcs in stock) is also available. The obsolete LM2754SQ (9300 Pcs in stock) represents existing inventory but lacks long-term supply assurance. For new designs and production continuity, selection of active-status substitutes is recommended.