LM2753SD LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM2753SD is a LED Driver IC manufactured by Texas Instruments, designed for camera flash applications. It functions as a 1-output DC DC regulator using switched capacitor (charge pump) topology with PWM dimming capability, rated for 400mA flash current output. The main part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2753SD
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Switched Capacitor (Charge Pump)
Number of Outputs	1
Voltage Supply Range	3V to 5.5V
Output Voltage	4.75V to 5.25V
Output Current	400mA (Flash)
Switching Frequency	725kHz
Dimming Method	PWM
Package	10-WFDFN Exposed Pad (10-SON 3x3)
Operating Temperature	-40°C to 85°C (TA)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the LM2753SD is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Switched Capacitor (Charge Pump) with 1 output
Input voltage range: 3V to 5.5V minimum compatibility
Output voltage: 4.75V to 5.25V range
Output current capability: Minimum 400mA (Flash)
Dimming method: PWM support
Package compatibility: 10-SON (3x3) or equivalent surface mount
Operating temperature: -40°C to 85°C minimum

Direct Equivalents maintain identical topology (switched capacitor charge pump), electrical specifications, and package form factor. These are pin-compatible and functionally interchangeable.

Parametric Equivalents match the core electrical specifications (input/output voltage, current rating, dimming capability) but may use alternative topologies (step-up/boost or step-down/buck) or different package sizes. These require circuit redesign evaluation.

Manufacturer-Recommended Alternatives are suggested by component suppliers based on functional similarity but may have different topologies, current ratings, or package configurations. These require full application review.

Parameter Comparison

Part Number	Manufacturer	Topology	Vin Min (V)	Vin Max (V)	Vout (V)	Iout (mA)	Frequency (kHz)	Dimming	Package	Status	RoHS
LM2753SD	Texas Instruments	Switched Capacitor	3.0	5.5	4.75-5.25	400	725	PWM	10-SON (3x3)	Obsolete	Non-compliant
LM2753SD/NOPB	Texas Instruments	Switched Capacitor	3.0	5.5	4.75-5.25	400	725	PWM	10-SON (3x3)	Active	ROHS3 Compliant
LM2753SDX/NOPB	Texas Instruments	Switched Capacitor	3.0	5.5	4.75-5.25	400	725	PWM	10-SON (3x3)	Active	ROHS3 Compliant
NCP5603MNR2G	onsemi	Switched Capacitor	2.7	5.5	4.75-5.25	200	—	PWM	10-DFN (3x3)	Obsolete	ROHS3 Compliant
MIC2297-15YML-TR	Microchip Technology	Step-Up (Boost)	2.5	10.0	—	1200	600	PWM	10-MLF (3x3)	Active	ROHS3 Compliant
AP5726FDCG-7	Diodes Incorporated	Step-Up (Boost)	2.7	5.5	—	750	1200	PWM	6-UDFN	Active	ROHS3 Compliant
RT9285CGQW	Richtek USA Inc.	Step-Up (Boost)	2.7	5.5	—	400	1000	PWM	8-WDFN (2x2)	Active	ROHS3 Compliant
BD6072HFN-TR	Rohm Semiconductor	Step-Up (Boost)	2.7	5.5	18.0	35	1000	PWM	8-HSON	Not For New Designs	ROHS3 Compliant
AL8861MP-13	Diodes Incorporated	Step-Down (Buck)	4.5	40.0	36.0	1500	1000	Analog, PWM	8-MSOP-EP	Active	ROHS3 Compliant
LT3478IFE-1#PBF	Analog Devices Inc.	Step-Down/Step-Up	2.8	36.0	42.0	4500	200-2250	PWM	16-TSSOP-EP	Active	ROHS3 Compliant
MP4689DN-LF	Monolithic Power Systems	Step-Down (Buck)	4.5	95.0	—	1000	1000	PWM	8-SOIC-EP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Pin-Compatible, Functionally Identical):

LM2753SD/NOPB and LM2753SDX/NOPB are direct replacements for the obsolete LM2753SD. Both maintain identical topology (switched capacitor charge pump), electrical specifications, package configuration (10-SON 3x3), and application suitability for camera flash. The primary distinction is product status: both are active components with ROHS3 compliance, addressing the RoHS non-compliance limitation of the original part. LM2753SDX/NOPB has higher inventory availability (4900 units) compared to LM2753SD/NOPB (2100 units).

Parametric Equivalents (Functional Substitution with Design Considerations):

MIC2297-15YML-TR (Microchip Technology) provides higher output current capability (1200mA switch current) using step-up (boost) topology. Input voltage range extends to 10V maximum, offering broader supply compatibility. Package is 10-MLF (3x3), mechanically similar to the original. This part requires circuit redesign to accommodate boost topology instead of charge pump topology.

RT9285CGQW (Richtek USA Inc.) matches the 400mA output current specification using step-up (boost) topology with 2.7V to 5.5V input range. Package is 8-WDFN (2x2), smaller than the original 10-SON. This part is suitable for applications where boost topology is acceptable and space constraints favor smaller packages.

AP5726FDCG-7 (Diodes Incorporated) provides 750mA switch current with step-up (boost) topology and 2.7V to 5.5V input compatibility. Package is 6-UDFN, the smallest option. This part is recommended for space-constrained designs requiring higher current capability than the original specification.

Not Recommended for New Designs:

BD6072HFN-TR (Rohm Semiconductor) is classified as "Not For New Designs" and should not be selected for new applications despite functional similarity. NCP5603MNR2G (onsemi) is obsolete with only 200mA output current, insufficient for the 400mA flash requirement.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant, addressing regulatory requirements not met by the original LM2753SD. Moisture sensitivity levels are consistent across all options (MSL 1 or MSL 2A), with no additional handling requirements introduced by substitution.

Frequently Asked Questions (FAQ)

Q: Can LM2753SD/NOPB be used as a direct replacement for LM2753SD?

A: Yes. LM2753SD/NOPB is electrically and mechanically identical to LM2753SD, with the same topology, specifications, and package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between LM2753SD/NOPB and LM2753SDX/NOPB?

A: Both parts are functionally identical with matching topology, electrical specifications, and package configuration. The difference is inventory availability and internal device variant designation (X suffix). Both are active, ROHS3-compliant alternatives to the obsolete LM2753SD.

Q: Why would I choose a boost topology substitute instead of a direct replacement?

A: Boost topology substitutes (MIC2297-15YML-TR, RT9285CGQW, AP5726FDCG-7) offer higher output current capability, extended input voltage ranges, or smaller package sizes. These advantages require circuit redesign to accommodate the different topology but may be necessary for applications with higher current demands or space constraints.

Q: Is the NCP5603MNR2G suitable as a substitute?

A: No. Although NCP5603MNR2G uses the same switched capacitor topology and 10-DFN package, its 200mA output current rating is insufficient for the LM2753SD's 400mA flash requirement. Additionally, NCP5603MNR2G is obsolete.

Q: What package compatibility considerations apply to substitution?

A: The original LM2753SD uses 10-SON (3x3) package. Direct replacements (LM2753SD/NOPB, LM2753SDX/NOPB) maintain this package. Parametric equivalents use alternative packages: MIC2297-15YML-TR uses 10-MLF (3x3) with similar footprint; RT9285CGQW uses 8-WDFN (2x2), smaller; AP5726FDCG-7 uses 6-UDFN, smallest. PCB layout modifications may be required for non-identical packages.

Q: Are all recommended substitutes ROHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance of the original LM2753SD. This compliance status is maintained across all recommended alternatives.

Q: What is the operating temperature range for substitute parts?

A: All recommended substitutes maintain the -40°C to 85°C operating temperature range of the original LM2753SD, with the exception of LT3478IFE-1#PBF, which extends to -40°C to 125°C (TJ). Temperature range compatibility is not a limiting factor for substitution.

Q: Can I use AL8861MP-13 or MP4689DN-LF as substitutes?

A: These parts use step-down (buck) topology, fundamentally different from the LM2753SD's switched capacitor (charge pump) topology. While both are LED driver regulators, buck topology requires different circuit design and input voltage requirements (4.5V minimum vs. 3V minimum). These are not recommended as direct substitutes without significant circuit redesign.

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