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MP1528DK-LF-P LED Driver IC Equivalent & Substitute Parts
Part Overview
The MP1528DK-LF-P is an LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a DC-DC regulator with Step-Up (Boost) topology, delivering 950mA switch current output for single-channel LED backlight applications. The part is currently in Active product status with 1800 units in stock inventory.
Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges. Alternative models may be required due to supply constraints, manufacturing discontinuation, or design optimization needs.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MP1528DK-LF-P |
| Manufacturer | Monolithic Power Systems Inc. |
| 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 | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the MP1528DK-LF-P are grouped based on the following critical parameters that determine functional equivalence:
Primary Substitution Criteria:
- Topology: Step-Up (Boost) DC-DC Regulator
- Number of Outputs: Single channel (1 output)
- Internal Switch: Present
- Supply Voltage Range: Minimum 2.7V input capability
- Output Current Capability: 750mA or greater switch current
- Dimming Control: PWM or Analog/PWM capability
- Applications: Backlight LED driver functionality
- Operating Temperature Range: -40°C to 85°C minimum
- RoHS Compliance: ROHS3 Compliant
- Mounting Type: Surface Mount
Substitutes are organized into two categories based on output current capacity and voltage specifications:
Category A - High Current Output (750mA+): Parts with 750mA to 1.2A switch current, supporting supply voltages up to 5.5V output range. These include AP5725FDCG-7, AP5726FDCG-7, LT3465AES6#TRPBF, LT3591EDDB#TRMPBF, and MAX1553ETA+T.
Category B - Specialized Topology/Current: Parts with alternative topologies or lower current ratings, including AP8803WTG-7 (Step-Down), BD6072HFN-TR (35mA), LM3519MK-20/NOPB (20mA), LM3553SDX/NOPB (1.2A Flash), and LTC3490EDD#PBF (350mA).
Parameter Comparison
| Parameter | MP1528DK-LF-P | AP5725FDCG-7 | AP5726FDCG-7 | LT3465AES6#TRPBF | LT3591EDDB#TRMPBF | MAX1553ETA+T |
|---|---|---|---|---|---|---|
| Topology | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Min) | 2.7V | 2.7V | 2.7V | 2.7V | 2.5V | 2.7V |
| Voltage - Supply (Max) | 36V | 5.5V | 5.5V | 16V | 12V | 5.5V |
| Voltage - Output | 36V | 26V | - | 30V | - | 40V |
| Current - Output / Channel | 950mA (Switch) | 750mA (Switch) | 750mA (Switch) | 225mA (Switch) | 500mA (Switch) | 480mA (Switch) |
| Dimming | Analog, PWM | PWM | PWM | PWM | PWM | Analog, PWM |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TJ) | -40°C ~ 85°C (TA) |
| Package / Case | 8-TSSOP, 8-MSOP | 6-UDFN Exposed Pad | 6-UDFN Exposed Pad | SOT-23-6 Thin, TSOT-23-6 | 8-WFDFN Exposed Pad | 8-WDFN Exposed Pad |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
AP5725FDCG-7 and AP5726FDCG-7 from Diodes Incorporated maintain Step-Up topology with 750mA output current and matching -40°C to 85°C operating range. Both are Active status, ROHS3 compliant, and support PWM dimming. Supply voltage maximum is limited to 5.5V compared to the MP1528DK-LF-P's 36V specification. Package differs from 8-MSOP to 6-UDFN, requiring PCB layout modification.
LT3465AES6#TRPBF from Analog Devices Inc. provides Step-Up topology with 225mA output current, Active status, and ROHS3 compliance. Supply voltage range extends to 16V with 30V output capability. PWM dimming is supported. TSOT-23-6 package requires different footprint implementation.
LT3591EDDB#TRMPBF from Analog Devices Inc. delivers 500mA output current in Step-Up configuration with Active status and ROHS3 compliance. Supply voltage extends to 12V. 8-DFN package differs from original specification.
MAX1553ETA+T from Analog Devices Inc./Maxim Integrated offers 480mA output current with Step-Up topology, Active status, and ROHS3 compliance. Supports both Analog and PWM dimming modes. Supply voltage limited to 5.5V maximum with 40V output capability. 8-TDFN package requires footprint adjustment.
Secondary Substitutes (Specialized Applications):
AP8803WTG-7 from Diodes Incorporated employs Step-Down (Buck) topology with 1A output current, differing fundamentally from the Boost topology of the main part. Operating temperature extends to 125°C. This substitute applies only when Step-Down regulation is functionally acceptable.
BD6072HFN-TR from Rohm Semiconductor is marked "Not For New Designs" and provides only 35mA output current, making it unsuitable for equivalent substitution despite Step-Up topology.
LM3519MK-20/NOPB from National Semiconductor delivers 20mA output current, insufficient for equivalent substitution despite Step-Up topology and Active status.
LM3553SDX/NOPB from Texas Instruments provides 1.2A Flash current with I2C dimming control and Step-Up topology. MSL rating is 3 (168 Hours) versus MSL 1 for the main part. Operating temperature minimum is -30°C versus -40°C.
LTC3490EDD#PBF from Analog Devices Inc. operates with 1V to 3.2V supply input and 2.8V to 4V output range, fundamentally different from the MP1528DK-LF-P's 2.7V to 36V specification. Analog dimming only, no PWM support.
Frequently Asked Questions (FAQ)
Q: Can AP5725FDCG-7 or AP5726FDCG-7 directly replace MP1528DK-LF-P without PCB modification?
A: No. While both maintain Step-Up topology and matching operating temperature range, the package changes from 8-MSOP to 6-UDFN Exposed Pad. PCB footprint redesign is required. Additionally, maximum supply voltage is limited to 5.5V versus 36V on the original part.
Q: What is the primary limitation when substituting with LT3465AES6#TRPBF?
A: Output current capacity is reduced from 950mA to 225mA. This substitution is valid only when circuit design accommodates lower switch current. Package changes from 8-MSOP to TSOT-23-6, requiring footprint modification.
Q: Why is AP8803WTG-7 listed as a substitute if it uses Step-Down topology?
A: AP8803WTG-7 is included as a specialized alternative for applications where Step-Down (Buck) regulation is functionally acceptable. It is not a direct equivalent due to topology difference. This part is suitable only when input voltage exceeds desired output voltage.
Q: Is LM3553SDX/NOPB suitable for new designs requiring the MP1528DK-LF-P specification?
A: LM3553SDX/NOPB provides higher output current (1.2A Flash) and Step-Up topology with Active status. However, MSL rating differs (MSL 3 versus MSL 1), and minimum operating temperature is -30°C instead of -40°C. I2C dimming control differs from Analog/PWM modes. Evaluate moisture sensitivity and temperature requirements for your application.
Q: What are the key parameters that must match for valid substitution?
A: Valid substitutes must maintain Step-Up (Boost) topology, single output configuration, internal switch presence, minimum 2.7V supply input capability, PWM or Analog/PWM dimming support, -40°C to 85°C operating range, ROHS3 compliance, and Surface Mount mounting type. Output current should be 750mA or greater for equivalent performance.
Q: Can LTC3490EDD#PBF substitute for MP1528DK-LF-P?
A: No. LTC3490EDD#PBF operates with fundamentally different voltage specifications (1V to 3.2V input, 2.8V to 4V output) compared to MP1528DK-LF-P (2.7V to 36V input, 36V output). Analog dimming only is supported without PWM capability. This part is not functionally equivalent.
Q: What package considerations apply when selecting a substitute?
A: All listed substitutes employ different package types than the original 8-MSOP specification. Package changes require PCB layout redesign, including footprint modification, trace routing adjustment, and thermal management evaluation. Verify mechanical clearance and thermal performance in your specific application before implementation.
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