LM3552SD LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3552SD is a Texas Instruments LED Driver IC designed for camera flash applications. It functions as a 1-output DC-DC Step-Up (Boost) regulator with 1A flash current capability, operating across a 2.7V to 5.5V supply range. The device is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. Alternative parts must maintain functional equivalence in topology, output configuration, and application suitability while accommodating modern component availability and compliance standards.

Substiute Parts

LM3552SD

Texas InstrumentsIn Stock: 2555LM3552SD Datasheet

Current PartRFQ

A6217KLJTR-1-T

Allegro MicroSystemsIn Stock: 2000A6217KLJTR-1-T Datasheet

MFR RecommendedRFQ

ADP1655ACBZ-R7

Analog Devices Inc.In Stock: 2317ADP1655ACBZ-R7 Datasheet

MFR RecommendedRFQ

LT3593ES6#TRMPBF

Analog Devices Inc.In Stock: 2083LT3593ES6#TRMPBF Datasheet

MFR RecommendedRFQ

MIC2298-15YML-TR

Microchip TechnologyIn Stock: 15634MIC2298-15YML-TR Datasheet

MFR RecommendedRFQ

MP2483DS-LF-Z

Monolithic Power Systems Inc.In Stock: 63839MP2483DS-LF-Z Datasheet

MFR RecommendedRFQ

PAM2803AAF095

Diodes IncorporatedIn Stock: 41155PAM2803AAF095 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3552SD is determined by the following critical parameters:

Primary Substitution Criteria:

• Topology: Step-Up (Boost) regulator configuration
• Number of Outputs: Single output only
• Supply Voltage Range: Minimum 2.7V to 5.5V compatibility
• Current Capability: Minimum 1A output current (flash mode)
• Operating Temperature: -40°C to 85°C range
• Application Suitability: Camera flash or equivalent high-current pulse applications

Secondary Considerations:

• Switching Frequency: 1MHz to 2MHz range acceptable
• Dimming Control: Optional (PWM, I2C, or analog acceptable)
• Package Form Factor: Surface mount only
• Compliance Status: Active product status preferred for long-term availability

The substitute parts listed below meet the primary substitution criteria with varying degrees of parameter alignment. Parts are grouped by functional equivalence rather than exact specification matching, as the obsolete status of the original part necessitates functional alternatives rather than pin-for-pin replacements.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Highest Functional Equivalence:

ADP1655ACBZ-R7 (Analog Devices Inc.) provides the closest functional match to the LM3552SD. Both devices operate as Step-Up (Boost) regulators within the 2.7V to 5.5V supply range and target camera flash applications. The ADP1655 operates at 2MHz with 500mA flash current capability, representing a 50% reduction in output current but maintaining the same supply voltage envelope and operating temperature range. Active product status and ROHS3 compliance ensure long-term availability and regulatory alignment.

MIC2298-15YML-TR (Microchip Technology) offers superior current handling at 4.6A switch current with Step-Up (Boost) topology and camera flash application suitability. The extended operating temperature range (-40°C to 125°C) and ROHS3 compliance support demanding environments. Supply voltage compatibility spans 2.5V to 10V, providing broader input range flexibility.

Tier 2 - Functional Alternatives with Trade-offs:

PAM2803AAF095 (Diodes Incorporated) functions as a Step-Up (Boost) regulator with 750mA output current and camera flash application focus. The exceptionally low minimum supply voltage (0.9V) enables operation from ultra-low battery states. ROHS3 compliance and active product status support modern design requirements.

LT3593ES6#TRMPBF (Analog Devices Inc.) operates as a Step-Up (Boost) regulator with 45mA output current, suitable for lower-power backlight applications rather than full-power camera flash. The compact TSOT-23-6 package offers space-constrained design advantages. ROHS3 compliance and active status ensure availability.

Tier 3 - Topology Variants:

MP2483DS-LF-Z (Monolithic Power Systems Inc.) provides dual-topology capability (Step-Down/Step-Up) with 2.5A output current and extended supply voltage range (4.5V to 55V). PWM and analog dimming options support flexible control schemes. Automotive-grade qualification and ROHS3 compliance indicate robust design validation. This part suits applications requiring input voltage flexibility beyond the original 2.7V to 5.5V specification.

A6217KLJTR-1-T (Allegro MicroSystems) operates as a Step-Down (Buck) regulator with 1.5A output current and extended supply voltage range (6V to 48V). Automotive-grade qualification and AEC-Q100 certification indicate high-reliability design. This part is suitable only for applications where step-down topology is acceptable and input voltage exceeds 6V.

Frequently Asked Questions (FAQ)

Q: Can the ADP1655ACBZ-R7 directly replace the LM3552SD in camera flash applications?

A: The ADP1655ACBZ-R7 provides functional equivalence for camera flash applications within the 2.7V to 5.5V supply range. However, the 500mA flash current output is 50% lower than the LM3552SD's 1A capability. Circuit redesign may be necessary if the original design requires the full 1A output current. The I2C dimming interface differs from the LM3552SD's dimming architecture, requiring firmware or control logic adaptation.

Q: What is the primary difference between Step-Up (Boost) and Step-Down (Buck) topologies for LED driver selection?

A: Step-Up (Boost) regulators increase input voltage to achieve higher output voltage, suitable for camera flash applications requiring voltage multiplication from low battery inputs. Step-Down (Buck) regulators reduce input voltage, suitable for applications where input voltage already exceeds the required output voltage. The LM3552SD uses Step-Up topology; substitutes maintaining this topology (ADP1655ACBZ-R7, PAM2803AAF095, LT3593ES6#TRMPBF, MIC2298-15YML-TR) are preferred for direct functional replacement. MP2483DS-LF-Z and A6217KLJTR-1-T offer alternative topologies requiring application-specific evaluation.

Q: Why is RoHS compliance important when selecting a substitute part?

A: RoHS3 compliance indicates adherence to current environmental and hazardous substance restrictions. The original LM3552SD is RoHS non-compliant, reflecting its obsolete status. All recommended substitute parts are ROHS3 compliant, ensuring compatibility with modern manufacturing standards, supply chain requirements, and regulatory frameworks. This compliance status supports long-term product viability and eliminates potential procurement restrictions.

Q: Can the MP2483DS-LF-Z replace the LM3552SD despite different topology?

A: The MP2483DS-LF-Z offers dual-topology capability (Step-Down/Step-Up) with higher current output (2.5A) and extended supply voltage range (4.5V to 55V). While it can function as a Step-Up regulator within the LM3552SD's supply range, the 14-SOIC package differs from the 14-WSON package, requiring PCB layout redesign. The higher current capability and dual-topology flexibility make this part suitable for applications requiring input voltage flexibility beyond 2.7V to 5.5V, but direct pin-compatible replacement is not possible.

Q: What package considerations apply when selecting a substitute part?

A: The LM3552SD uses a 14-WSON (4x4) package. Substitute parts employ different packages: ADP1655ACBZ-R7 (12-WLCSP), PAM2803AAF095 (SOT-23-6), LT3593ES6#TRMPBF (TSOT-23-6), MIC2298-15YML-TR (12-MLF), MP2483DS-LF-Z (14-SOIC), and A6217KLJTR-1-T (8-SOIC-EP). Package differences require PCB layout redesign, including trace routing, thermal management, and component placement modifications. Smaller packages (SOT-23-6, TSOT-23-6) offer space savings but may present thermal management challenges for high-current applications. Larger packages (14-SOIC, 12-MLF) provide improved thermal performance and easier assembly handling.

Q: Which substitute part offers the best thermal performance for sustained high-current operation?

A: MIC2298-15YML-TR provides the highest current capability (4.6A switch current) with a 12-MLF (3x3) package featuring exposed pad thermal design. The extended operating temperature range (-40°C to 125°C) supports demanding thermal environments. For applications requiring sustained high-current operation, this part offers superior thermal performance compared to lower-current alternatives. MP2483DS-LF-Z (2.5A, 14-SOIC) provides secondary thermal performance with dual-topology flexibility.

Q: Are there inventory considerations when selecting a substitute part?

A: All recommended substitute parts maintain substantial inventory levels: ADP1655ACBZ-R7 (2,252 pcs), PAM2803AAF095 (41,100 pcs), LT3593ES6#TRMPBF (2,051 pcs), MIC2298-15YML-TR (15,597 pcs), MP2483DS-LF-Z (63,800 pcs), and A6217KLJTR-1-T (1,930 pcs). MP2483DS-LF-Z offers the highest inventory availability. All parts maintain active product status, ensuring continued supply and support. Inventory levels support both prototype development and production-scale deployment.