MP1519DQ-LF-P LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP1519DQ-LF-P is an active LED Driver IC manufactured by Monolithic Power Systems Inc., designed for backlight applications requiring switched capacitor (charge pump) topology with analog dimming control. This 4-output DC-DC regulator operates across a 2.5V to 5.5V supply range and delivers 22mA per channel at 1.3MHz switching frequency in a compact 16-QFN (3x3) surface mount package.

Identifying equivalent and substitute parts becomes necessary when addressing supply chain constraints, inventory availability, or design flexibility requirements while maintaining functional compatibility with the original specification.

Substiute Parts

MP1519DQ-LF-P

Monolithic Power Systems Inc.In Stock: 5307MP1519DQ-LF-P Datasheet

Current PartRFQ

LM2794TL/NOPB

Texas InstrumentsIn Stock: 3104LM2794TL/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP1519DQ-LF-P is determined by the following critical parameters:

Core Functional Requirements:

• Topology: Switched Capacitor (Charge Pump)
• Number of Outputs: 4
• Supply Voltage Range: Minimum 2.5V, Maximum 5.5V
• Current Capacity: 22mA per channel
• Dimming Control: Analog capability
• Application: Backlight LED driver

Physical & Environmental Constraints:

• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C to 85°C
• Compliance: ROHS3, REACH Unaffected, EAR99

The LM2794TL/NOPB from Texas Instruments qualifies as a functional substitute based on matching topology, 4-output configuration, overlapping supply voltage range, and analog dimming capability. Package differences and minor parameter variations are documented in the comparison table below.

Parameter Comparison

Engineering Selection Recommendations

Both the MP1519DQ-LF-P and LM2794TL/NOPB maintain Active product status with full ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring long-term supply chain viability and regulatory alignment.

Selection between these parts should account for the following documented differences:

MP1519DQ-LF-P advantages: Higher minimum supply voltage tolerance (2.5V vs. 2.7V), higher per-channel current capacity (22mA vs. 20mA), higher switching frequency (1.3MHz vs. 515kHz), and wider operating temperature range (-40°C to 85°C vs. -30°C to 85°C).

LM2794TL/NOPB advantages: Dual dimming capability (Analog and PWM), specified output voltage (3.8V), and alternative package option (14-DSBGA vs. 16-QFN).

Package differences require PCB layout and assembly process evaluation. The 16-QFN (3x3) footprint of the MP1519DQ-LF-P differs from the 14-DSBGA footprint of the LM2794TL/NOPB, necessitating design modifications if substitution is implemented.

Frequently Asked Questions (FAQ)

Q: Can the LM2794TL/NOPB directly replace the MP1519DQ-LF-P without PCB modifications?

A: No. The LM2794TL/NOPB uses a 14-DSBGA package while the MP1519DQ-LF-P uses a 16-QFN (3x3) package. PCB layout and footprint redesign are required. Pin-to-pin compatibility cannot be assumed.

Q: What is the impact of the 2mA per-channel current difference?

A: The LM2794TL/NOPB delivers 20mA per channel versus 22mA for the MP1519DQ-LF-P. Applications requiring the full 22mA specification must verify that 20mA output meets brightness and performance requirements.

Q: Does the lower minimum supply voltage of the MP1519DQ-LF-P (2.5V vs. 2.7V) matter?

A: Yes, if your system operates at supply voltages between 2.5V and 2.7V. The MP1519DQ-LF-P supports this range; the LM2794TL/NOPB does not. Verify your actual supply voltage specification before substitution.

Q: What is the significance of the switching frequency difference (1.3MHz vs. 515kHz)?

A: Higher switching frequency (1.3MHz) typically enables smaller external component sizes and reduced EMI in the MP1519DQ-LF-P. The lower frequency (515kHz) of the LM2794TL/NOPB may require larger filtering components and could affect noise characteristics.

Q: Can I use PWM dimming with the MP1519DQ-LF-P?

A: The MP1519DQ-LF-P supports Analog dimming only. The LM2794TL/NOPB supports both Analog and PWM dimming. If PWM dimming is required, the MP1519DQ-LF-P is not suitable.

Q: Are both parts suitable for production use?

A: Yes. Both parts maintain Active product status with ROHS3 compliance, unlimited MSL ratings, and REACH unaffected status, confirming suitability for production applications.

Q: What temperature range considerations apply?

A: The MP1519DQ-LF-P operates from -40°C to 85°C, while the LM2794TL/NOPB operates from -30°C to 85°C. Applications requiring operation below -30°C must use the MP1519DQ-LF-P.