LM3552SD/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3552SD/NOPB 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 from a 2.7V to 5.5V supply. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. This reference provides engineering-grade alternatives based on strict electrical and mechanical parameter compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM3552SD/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply (Min)	2.7V
Voltage Supply (Max)	5.5V
Current Output / Channel	1A (Flash)
Frequency	1.25MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	14-WFDFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM3552SD/NOPB is determined by the following critical parameters:

Primary Compatibility Criteria:

Topology: Step-Up (Boost) regulator
Supply voltage range: 2.7V to 5.5V input
Output current capability: 1A or greater (flash mode)
Number of outputs: Single output
Internal switch: Required
Operating temperature range: Minimum -40°C to 85°C
Mounting type: Surface mount
Application focus: Camera flash or backlight

Secondary Considerations:

Frequency range: 1.2MHz to 1.45MHz preferred for similar switching characteristics
Package compatibility: 14-pin or smaller WSON/WFDFN packages
Dimming capability: Optional but beneficial
Product status: Active status preferred for long-term availability

The substitute parts listed below meet these core electrical parameters while offering various enhancements such as I2C control, improved current ratings, or extended temperature ranges. Selection depends on specific application requirements and PCB layout constraints.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min	Supply Max	Output Current	Frequency	Package	Status	Temp Range
LM3552SD/NOPB	Texas Instruments	Step-Up (Boost)	2.7V	5.5V	1A (Flash)	1.25MHz	14-WFDFN	Obsolete	-40°C ~ 85°C
LM3553SDX/NOPB	Texas Instruments	Step-Up (Boost)	2.7V	5.5V	1.2A (Flash)	1.2MHz	12-WFDFN	Active	-30°C ~ 85°C
ISL97634IRT14Z-T	Intersil	SEPIC, Step-Up (Boost)	2.4V	5.5V	70mA	1.45MHz	8-WFDFN	Active	-40°C ~ 85°C
MIC2871YMK-TR	Microchip Technology	Step-Up (Boost)	2.7V	5.5V	1.2A (Flash)	2MHz	14-WFDFN	Obsolete	-40°C ~ 125°C
MP1518DG-LF-Z	Monolithic Power Systems Inc.	Step-Up (Boost)	2.5V	6V	350mA (Switch)	1.3MHz	8-TFDFN	Active	-40°C ~ 125°C
MP3202DJ-LF-P	Monolithic Power Systems Inc.	Step-Up (Boost)	2.5V	6V	1.33A (Switch)	1.3MHz	TSOT-23-6	Active	-40°C ~ 85°C
NCP3066DR2G	onsemi	Step-Down (Buck), Step-Up (Boost)	3V	40V	1.5A (Switch)	150kHz	8-SOIC	Active	0°C ~ 85°C
STCF07PNR	STMicroelectronics	Step-Down (Buck), Step-Up (Boost)	2.7V	5.5V	1A (Flash)	1.8MHz	16-VFQFN	Obsolete	-40°C ~ 85°C

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Active Status, Highest Compatibility):

LM3553SDX/NOPB is the manufacturer-recommended successor from Texas Instruments. It maintains the same supply voltage range (2.7V to 5.5V), improves output current to 1.2A, and operates at 1.2MHz. The device is active and ROHS3 compliant. The primary trade-off is a reduced operating temperature minimum (-30°C versus -40°C) and smaller package footprint (12-WFDFN versus 14-WFDFN), which may require PCB layout adjustment.

MP3202DJ-LF-P offers the highest output current (1.33A switch current) among active boost regulators in this voltage class. It supports both analog and PWM dimming, operates across -40°C to 85°C, and is ROHS3 compliant. The TSOT-23-6 package is significantly smaller, suitable for space-constrained applications.

Tier 2 - Functional Equivalents (Active Status, Parameter Variations):

MP1518DG-LF-Z provides 350mA switch current with extended temperature range (-40°C to 125°C) and is ROHS3 compliant. Suitable for lower-current flash applications or where thermal performance is critical.

NCP3066DR2G supports both buck and boost topologies with 1.5A switch current and wide supply range (3V to 40V). Operating temperature is limited to 0°C to 85°C. This device offers flexibility for mixed-topology designs.

Tier 3 - Legacy Alternatives (Obsolete Status):

MIC2871YMK-TR and STCF07PNR are obsolete but remain in inventory. MIC2871YMK-TR matches the 1.2A flash current and 2.7V to 5.5V supply range with extended temperature operation (-40°C to 125°C). STCF07PNR provides dual-topology capability (buck/boost) with identical 1A flash current and supply range.

Compliance & Certification:

All listed substitutes are ROHS3 compliant and REACH unaffected. Moisture sensitivity levels range from MSL 1 (unlimited) to MSL 3 (168 hours), consistent with surface-mount LED driver standards.

Frequently Asked Questions (FAQ)

Q: Can LM3553SDX/NOPB directly replace LM3552SD/NOPB without PCB modification?

A: LM3553SDX/NOPB is electrically compatible but uses a smaller 12-WFDFN package versus the original 14-WFDFN. PCB footprint adjustment is required. The reduced operating temperature minimum (-30°C) must be verified against application requirements.

Q: What is the key difference between MP1518DG-LF-Z and MP3202DJ-LF-P?

A: MP3202DJ-LF-P delivers higher switch current (1.33A versus 350mA) and uses a smaller TSOT-23-6 package. MP1518DG-LF-Z offers extended temperature range (-40°C to 125°C) and larger 8-TFDFN package. Selection depends on current requirements and thermal constraints.

Q: Why does NCP3066DR2G have a lower operating temperature minimum (0°C)?

A: NCP3066DR2G is specified for 0°C to 85°C operation. Applications requiring -40°C operation must use alternatives such as LM3553SDX/NOPB, MP3202DJ-LF-P, or MIC2871YMK-TR.

Q: Is ISL97634IRT14Z-T suitable for camera flash applications?

A: ISL97634IRT14Z-T uses SEPIC topology with only 70mA output current, significantly lower than the LM3552SD/NOPB (1A flash). It is suitable for backlight applications but not recommended for camera flash requiring higher current delivery.

Q: What packaging considerations apply when switching from 14-WFDFN to TSOT-23-6?

A: TSOT-23-6 is substantially smaller than 14-WFDFN, reducing PCB area but requiring careful thermal management. Verify thermal pad design and trace routing for the smaller package. Pin count reduction (6 versus 14) may limit functionality or require external component changes.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Which substitute offers the widest supply voltage range?

A: NCP3066DR2G supports 3V to 40V input, the widest range among listed substitutes. However, this comes with reduced output current (1.5A switch) and lower operating temperature minimum (0°C).

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