MP1518DJ-LF-Z Equivalent & Substitute Parts

Part Overview

The MP1518DJ-LF-Z is an LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This single-output DC-DC regulator features Step-Up (Boost) topology with internal switching capability, designed for backlight applications. The device operates from a 2.5V to 6V supply and delivers up to 350mA switch current with 25V output capability. It supports both Analog and PWM dimming at 1.3MHz switching frequency in a compact TSOT-23-6 surface mount package.

The MP1518DJ-LF-Z maintains Active product status and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Finding equivalent and substitute parts becomes necessary when the original packaging variant (Cut Tape) is unavailable, when alternative manufacturers' solutions are preferred for supply chain diversification, or when design requirements necessitate different electrical or mechanical characteristics.

Key Parameters

Parameter	Value
Manufacturer	Monolithic Power Systems Inc.
Part Number	MP1518DJ-LF-Z
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Package	SOT-23-6 Thin (TSOT-23-6)
Supply Voltage Range	2.5V to 6V
Output Voltage	25V
Output Current	350mA (Switch)
Switching Frequency	1.3MHz
Dimming Control	Analog, PWM
Operating Temperature	-40°C to 125°C (TJ)
Internal Switch	Yes
Number of Outputs	1
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the MP1518DJ-LF-Z is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) configuration
Supply voltage range compatibility: Minimum 2.5V input capability
Output current capability: Minimum 350mA switch current
Dimming control: Support for Analog and/or PWM dimming
Package form factor: Surface mount with compatible pinout
Operating temperature range: Support for -40°C minimum
Internal switching capability: Integrated switch required

Secondary Compatibility Factors:

Output voltage capability: 25V or higher
Switching frequency: 1MHz or higher
RoHS and REACH compliance status
Moisture sensitivity level and thermal characteristics

Substitute parts are grouped into two categories: parametric equivalents (same manufacturer, identical electrical specifications, different packaging) and manufacturer-recommended alternatives (different manufacturers, comparable or enhanced electrical performance, different package options).

Parameter Comparison

Parameter	MP1518DJ-LF-Z	MP1518DJ-LF-P	LT1937ES5#TRPBF	LT3491ESC8#TRPBF	IS31BL3508A-STLS2-TR	LM3530TMX-40/NOPB
Manufacturer	MPS	MPS	ADI	ADI	Lumissil	TI
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Supply Voltage (Min)	2.5V	2.5V	2.5V	2.5V	2.7V	2.7V
Supply Voltage (Max)	6V	6V	10V	12V	5.5V	5.5V
Output Voltage	25V	25V	36V	—	—	40V
Output Current (Switch)	350mA	350mA	320mA	350mA	1.6A	30mA
Switching Frequency	1.3MHz	1.3MHz	1.2MHz	2.3MHz	1MHz	500kHz
Dimming Control	Analog, PWM	Analog, PWM	Analog, PWM	PWM	Analog, PWM	PWM
Package	TSOT-23-6	TSOT-23-6	TSOT-23-5	SC-70-8	SOT-23-6	12-DSBGA
Operating Temperature	-40°C to 125°C (TJ)	-40°C to 125°C (TJ)	-40°C to 85°C (TA)	-40°C to 85°C (TA)	-40°C to 85°C (TA)	-40°C to 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: MP1518DJ-LF-P is the primary substitute for MP1518DJ-LF-Z. Both parts share identical electrical specifications, topology, and package form factor. The only difference is packaging format: MP1518DJ-LF-P is supplied in Tape & Reel (TR) configuration versus the original Cut Tape (CT) variant. This substitution requires no design changes and maintains full compatibility with existing PCB layouts and thermal characteristics.

Functional Equivalents with Design Considerations:

LT1937ES5#TRPBF (Analog Devices Inc.) provides comparable performance with extended supply voltage range (2.5V to 10V) and higher output voltage capability (36V). Operating temperature range is reduced to -40°C to 85°C. This part is suitable when higher input voltage tolerance or output voltage is required.

LT3491ESC8#TRPBF (Analog Devices Inc.) matches the 350mA switch current specification and supports PWM dimming. It operates across 2.5V to 12V input range with higher switching frequency (2.3MHz). Package differs as SC-70-8 versus TSOT-23-6, requiring PCB layout modification. Analog dimming control is not supported.

IS31BL3508A-STLS2-TR (Lumissil Microsystems) offers significantly higher output current capability (1.6A) in SOT-23-6 package with Analog and PWM dimming support. Supply voltage range is 2.7V to 5.5V. Moisture sensitivity level is MSL 3 (168 Hours) versus MSL 1, requiring controlled storage conditions.

LM3530TMX-40/NOPB (Texas Instruments) provides Step-Up topology with 40V output capability and PWM dimming. Output current is limited to 30mA, making this suitable only for lower-power backlight applications. Package is 12-DSBGA, requiring significant PCB redesign.

Product Status Compliance: All recommended substitutes maintain Active product status except BD60A00NUX-TR (Rohm Semiconductor), which is marked Not For New Designs. BD60A00NUX-TR should be avoided for new designs despite its availability.

All substitutes are ROHS3 compliant and REACH unaffected, matching the original part's regulatory compliance profile.

Frequently Asked Questions (FAQ)

Q: Can MP1518DJ-LF-P be used as a direct replacement for MP1518DJ-LF-Z without any design changes?

A: Yes. MP1518DJ-LF-P is a parametric equivalent with identical electrical specifications, topology, and package footprint. The only difference is packaging format (Tape & Reel versus Cut Tape). No PCB layout, schematic, or thermal design modifications are required.

Q: What is the key difference between the MP1518DJ-LF-Z and LT1937ES5#TRPBF?

A: Both are Step-Up LED driver ICs with similar output current (350mA vs 320mA). LT1937ES5#TRPBF supports higher input voltage (up to 10V vs 6V) and higher output voltage (36V vs 25V). Operating temperature range is reduced from -40°C to 125°C to -40°C to 85°C. Package differs: TSOT-23-5 versus TSOT-23-6, requiring PCB layout changes.

Q: Why does IS31BL3508A-STLS2-TR have higher output current (1.6A) than the original part (350mA)?

A: IS31BL3508A-STLS2-TR is designed for higher-power backlight applications. The increased switch current capability allows it to deliver more power to the load. This part is suitable only if the application requires higher current delivery. For designs requiring exactly 350mA, this part may introduce unnecessary cost and complexity.

Q: What does MSL 3 (168 Hours) mean for IS31BL3508A-STLS2-TR?

A: MSL 3 indicates the part requires controlled storage conditions with maximum 168 hours of floor life after moisture exposure. This is more restrictive than MSL 1 (Unlimited). The part must be stored in dry conditions and used within the specified timeframe after opening the moisture barrier bag. This affects supply chain handling and inventory management.

Q: Can LM3530TMX-40/NOPB replace the MP1518DJ-LF-Z in a backlight application?

A: LM3530TMX-40/NOPB is not suitable as a direct replacement. While it provides Step-Up topology and backlight application support, output current is limited to 30mA compared to 350mA required by the original design. This part is only appropriate for very low-power backlight applications. Additionally, the 12-DSBGA package requires complete PCB redesign.

Q: Why is BD60A00NUX-TR listed but not recommended?

A: BD60A00NUX-TR is marked as Not For New Designs by Rohm Semiconductor. While it provides Step-Up topology and backlight capability, its discontinued design status makes it unsuitable for new product development. Existing designs using this part should plan migration to active alternatives.

Q: What are the critical parameters that determine if a part can substitute for MP1518DJ-LF-Z?

A: The following parameters must be met: Step-Up (Boost) topology, minimum 2.5V input voltage support, minimum 350mA switch current capability, Analog and/or PWM dimming control, surface mount package compatibility, and -40°C minimum operating temperature. Output voltage should be 25V or higher. Deviations from these parameters require design validation.

Q: Does package type affect electrical performance?

A: Package type does not affect electrical performance but impacts PCB layout, thermal dissipation, and manufacturing processes. TSOT-23-6 and SOT-23-6 packages are mechanically similar and may share footprints. SC-70-8 and 12-DSBGA packages require different PCB layouts and cannot be used as direct pin-compatible replacements without redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original MP1518DJ-LF-Z. This ensures compatibility with environmental and safety regulations across all markets.

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