MP1528DQ-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP1528DQ-LF-Z is an active LED Driver IC manufactured by Monolithic Power Systems, designed for backlight applications. This single-output DC-DC regulator features a step-up (boost) topology with internal switching capability, delivering up to 950mA output current with both analog and PWM dimming control. The device operates across a wide supply voltage range of 2.7V to 36V and is housed in a 6-QFN (3x3) package. With ROHS3 compliance and unlimited moisture sensitivity rating, this component is suitable for industrial and consumer lighting applications requiring high current output and flexible dimming options.

Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative packaging or performance requirements while maintaining functional compatibility within LED driver applications.

Key Parameters

Parameter	MP1528DQ-LF-Z
Manufacturer	Monolithic Power Systems
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply (Min)	2.7V
Voltage Supply (Max)	36V
Voltage Output	36V
Current Output / Channel	950mA (Switch)
Dimming	Analog, PWM
Applications	Backlight
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	6-VDFN Exposed Pad
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MP1528DQ-LF-Z are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Up (Boost) configuration with internal switching
Output capability: Single output channel
Dimming support: Analog and/or PWM dimming functionality
Supply voltage range: Minimum 2.7V input capability
Output voltage: 26V or higher to support 36V output requirement
Current output: 350mA or higher to meet or exceed 950mA requirement
Operating temperature: -40°C to 85°C range
Compliance: ROHS3 compliant, MSL 1 or 2 rating
Mounting: Surface mount technology

Substitutes are grouped into two categories based on current output capability:

Group A - High Current Output (≥500mA): Parts suitable for direct replacement in applications requiring maximum current delivery comparable to the MP1528DQ-LF-Z.

Group B - Lower Current Output (<500mA): Parts suitable for applications with reduced current requirements or where output current is not the limiting design factor.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min	Supply Max	Output Voltage	Current Output	Dimming	Package	Frequency
MP1528DQ-LF-Z	Monolithic Power Systems	Step-Up (Boost)	2.7V	36V	36V	950mA	Analog, PWM	6-QFN (3x3)	—
MAX1561ETA+T	Analog Devices Inc./Maxim Integrated	Step-Up (Boost)	2.6V	5.5V	26V	950mA	Analog, PWM	8-TDFN (3x3)	1MHz
LT3591EDDB#TRPBF	Analog Devices Inc.	Step-Up (Boost)	2.5V	12V	—	500mA	PWM	8-DFN (3x2)	1MHz
LT1932ES6#TRMPBF	Analog Devices Inc.	Step-Up (Boost)	1V	10V	36V	40mA	PWM	TSOT-23-6	1.2MHz
LTC3490ES8#TRPBF	Analog Devices Inc.	Step-Up (Boost)	1V	3.2V	2.8V ~ 4V	350mA	Analog	8-SO	1.3MHz
LT3498EDDB#TRMPBF	Analog Devices Inc.	Step-Up (Boost)	2.5V	12V	32V	20mA	Analog, PWM	12-DFN (3x2)	2.3MHz
AP5724WG-7	Diodes Incorporated	Step-Up (Boost)	2.7V	5.5V	—	750mA	PWM	SOT-23-6	1.2MHz
LM3530UMX-25A/NOPB	Texas Instruments	Step-Up (Boost)	2.7V	5.5V	40V	30mA	PWM	12-DSBGA	500kHz
TPS61042DRBR	Texas Instruments	Step-Up (Boost)	1.8V	6V	27.5V	60mA	PWM	8-SON (3x3)	1MHz
MAX8901AETA+T	Analog Devices Inc./Maxim Integrated	Step-Up (Boost)	2.6V	5.5V	26V	25mA	PWM	8-TDFN-EP (2x2)	750kHz
LT3474EFE-1#TRPBF	Analog Devices Inc.	Step-Down (Buck)	4.6V	36V	—	1A	PWM	16-TSSOP-EP	200kHz ~ 2MHz

Engineering Selection Recommendations

Direct Replacement Candidate:

MAX1561ETA+T is the closest functional equivalent to the MP1528DQ-LF-Z. Both devices deliver 950mA output current, support analog and PWM dimming, operate across overlapping supply voltage ranges (2.6V to 5.5V for MAX1561ETA+T versus 2.7V to 36V for MP1528DQ-LF-Z), and are housed in similar 8-pin DFN packages with exposed pads. Both are ROHS3 compliant with MSL 1 rating. The primary design consideration is the reduced maximum supply voltage (5.5V versus 36V) and output voltage (26V versus 36V) of the MAX1561ETA+T, which may limit application scope in high-voltage backlight systems.

High Current Alternatives (≥500mA):

LT3591EDDB#TRPBF provides 500mA output current in an 8-DFN package with PWM dimming support. Supply voltage range is 2.5V to 12V. This part is suitable for applications where current requirements are moderate and supply voltage does not exceed 12V.

AP5724WG-7 from Diodes Incorporated delivers 750mA output current with PWM dimming in a compact SOT-23-6 package. Supply voltage range is 2.7V to 5.5V, matching the MP1528DQ-LF-Z minimum specification. This part is appropriate for designs with constrained board space and supply voltages below 5.5V.

Lower Current Alternatives (<500mA):

LT1932ES6#TRMPBF, LTC3490ES8#TRPBF, LT3498EDDB#TRMPBF, LM3530UMX-25A/NOPB, TPS61042DRBR, and MAX8901AETA+T are suitable for backlight applications with reduced current requirements (20mA to 60mA range). These parts maintain step-up topology and backlight application focus but are not recommended as direct replacements for high-current LED driver requirements.

Topology Exception:

LT3474EFE-1#TRPBF employs step-down (buck) topology rather than step-up (boost) configuration. This part is not functionally equivalent for boost converter applications and is included only for reference in the provided substitute list.

All recommended substitutes maintain ROHS3 compliance and MSL 1 or 2 ratings, ensuring regulatory and environmental compatibility with the original MP1528DQ-LF-Z specification.

Frequently Asked Questions (FAQ)

Q: Can MAX1561ETA+T replace MP1528DQ-LF-Z in all applications?

A: MAX1561ETA+T is functionally compatible for backlight applications operating within its supply voltage range of 2.6V to 5.5V and output voltage of 26V. Applications requiring supply voltages above 5.5V or output voltages above 26V require alternative parts. Both devices deliver 950mA output current and support analog/PWM dimming, making them suitable for equivalent performance in compatible voltage domains.

Q: What is the significance of the supply voltage range difference?

A: The MP1528DQ-LF-Z accepts supply voltages from 2.7V to 36V, while most substitutes operate within narrower ranges (typically 2.5V to 12V or 2.6V to 5.5V). This difference is critical for applications powered by high-voltage sources. Designs using 12V, 24V, or 36V supply rails must verify substitute part specifications before selection.

Q: Are lower current parts suitable for MP1528DQ-LF-Z replacement?

A: Lower current parts (20mA to 60mA output) are not suitable direct replacements for applications requiring 950mA output. These parts are appropriate only when design requirements permit reduced current delivery. Substitution requires complete circuit redesign and validation.

Q: What packaging considerations apply to substitution?

A: The MP1528DQ-LF-Z uses 6-QFN (3x3) packaging. Substitutes employ various packages including 8-TDFN, 8-DFN, SOT-23-6, 12-DSBGA, 8-SON, and 16-TSSOP. Package differences affect PCB layout, thermal management, and board space requirements. Verify footprint compatibility and thermal performance before design implementation.

Q: Does dimming capability affect substitution suitability?

A: The MP1528DQ-LF-Z supports both analog and PWM dimming. Substitutes offer varying dimming support: some provide both modes (MAX1561ETA+T, LT3498EDDB#TRMPBF), while others support PWM only (LT3591EDDB#TRPBF, AP5724WG-7, LM3530UMX-25A/NOPB, TPS61042DRBR, MAX8901AETA+T) or analog only (LTC3490ES8#TRPBF). Application dimming requirements must align with substitute part capabilities.

Q: Why is LT3474EFE-1#TRPBF included if it uses different topology?

A: LT3474EFE-1#TRPBF employs step-down (buck) topology rather than step-up (boost). This part is not functionally equivalent for boost converter applications. It is included in the reference list only because it appears in the provided substitute data. Buck converters require different circuit design and are not suitable replacements for boost applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All parts listed maintain ROHS3 compliance and MSL 1 or 2 ratings, ensuring regulatory and environmental compatibility with the original MP1528DQ-LF-Z specification.

Q: What operating temperature range do substitutes support?

A: All substitutes maintain the -40°C to 85°C operating temperature range specified for the MP1528DQ-LF-Z, ensuring thermal compatibility across industrial and consumer applications.

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