MP3391EY-LF-Z Equivalent & Substitute Parts

Part Overview

The MP3391EY-LF-Z is an LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This 28-SOIC surface mount device functions as an 8-output DC-DC controller with step-up (boost) topology, delivering 120mA per channel output current at 280kHz PWM dimming frequency. The device operates across a 9V to 35V supply voltage range and is designed for backlight applications with an operating temperature range of -20°C to 85°C. The part maintains active product status and ROHS3 compliance.

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter tolerances for LED driver controller applications, particularly where supply voltage ranges, output current capabilities, dimming control methods, and package compatibility align with system requirements.

Substiute Parts

MP3391EY-LF-Z

Monolithic Power Systems Inc.In Stock: 99229MP3391EY-LF-Z Datasheet

Current PartRFQ

LT3760IFE#PBF

Analog Devices Inc.In Stock: 2525LT3760IFE#PBF Datasheet

MFR RecommendedRFQ

TPS61199PWPR

Texas InstrumentsIn Stock: 6364TPS61199PWPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MP3391EY-LF-Z are qualified based on the following critical parameters that define functional equivalence in LED driver controller applications:

• Topology: Step-Up (Boost) DC-DC controller architecture
• Output Configuration: 8-output LED driver capability
• Supply Voltage Range: Overlap or compatibility with 9V-35V input specification
• Output Current: Per-channel current delivery capability
• Dimming Control: PWM or analog/PWM dimming support
• Package Type: Surface mount configuration with pin-compatible or functionally equivalent packaging
• Compliance: ROHS3 compliance and active product status
• Application: Backlight LED driver functionality

The identified substitutes (LT3760IFE#PBF and TPS61199PWPR) maintain the core boost topology and 8-output LED driver functionality. Variations in supply voltage ranges, output current per channel, switching frequency, package form factor, and operating temperature ranges are documented to enable informed selection based on specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance, qualifying them for use in applications requiring regulatory adherence and long-term supply availability.

LT3760IFE#PBF (Analog Devices Inc.) extends the minimum supply voltage to 6V and maximum to 40V, providing broader input range coverage. The device supports both analog and PWM dimming control, offering additional flexibility in dimming implementation. Operating temperature range extends to -40°C to 125°C, suitable for extended environmental conditions. Output current per channel is 100mA, representing a 17% reduction from the MP3391EY-LF-Z. Package form factor differs (28-TSSOP-EP versus 28-SOIC), requiring PCB layout modification. Moisture sensitivity level is 1 (Unlimited), indicating superior moisture tolerance compared to the main part's MSL 3.

TPS61199PWPR (Texas Instruments) operates within a narrower supply voltage range (8V to 30V), with the lower bound closer to the MP3391EY-LF-Z minimum. Output current per channel is 70mA, representing a 42% reduction from the main part. Switching frequency range is 500kHz to 800kHz. Package configuration is 20-PowerTSSOP, differing in both pin count and form factor from the 28-SOIC main part. Operating temperature range matches the main part at -40°C to 85°C. Moisture sensitivity level is 2 (1 Year).

Selection between substitutes depends on specific circuit requirements regarding supply voltage range, required output current per channel, dimming control methodology, and PCB layout constraints imposed by package differences.

Frequently Asked Questions (FAQ)

Q: Can the LT3760IFE#PBF directly replace the MP3391EY-LF-Z on the same PCB?

A: Direct PCB replacement is not possible due to package differences. The MP3391EY-LF-Z uses 28-SOIC packaging (0.295" width), while the LT3760IFE#PBF uses 28-TSSOP-EP packaging (0.173" width). PCB layout redesign is required, including footprint modification and potential trace routing changes.

Q: What is the impact of reduced output current in the TPS61199PWPR?

A: The TPS61199PWPR delivers 70mA per channel compared to the MP3391EY-LF-Z at 120mA per channel. This 42% reduction in current capability may limit the number or brightness of LED strings that can be driven per output channel. Circuit design must account for this reduced current capacity.

Q: Are there dimming control differences between the substitutes?

A: The MP3391EY-LF-Z and TPS61199PWPR both support PWM dimming only. The LT3760IFE#PBF supports both analog and PWM dimming, providing additional control flexibility. System firmware or hardware dimming implementation must align with the selected part's dimming capabilities.

Q: How do supply voltage ranges affect part selection?

A: The MP3391EY-LF-Z operates from 9V to 35V. The LT3760IFE#PBF extends this to 6V to 40V, accommodating lower and higher input voltages. The TPS61199PWPR operates from 8V to 30V, with a lower minimum but reduced maximum. Circuit power supply specifications must fall within the selected part's operating range.

Q: What are the package-related considerations for substitution?

A: The MP3391EY-LF-Z uses 28-SOIC (0.295" width). The LT3760IFE#PBF uses 28-TSSOP-EP (0.173" width), and the TPS61199PWPR uses 20-PowerTSSOP (0.173" width). Different packages require PCB redesign. The TPS61199PWPR also has fewer pins (20 versus 28), potentially affecting circuit connectivity and requiring schematic modification.

Q: Do operating temperature ranges differ significantly?

A: The MP3391EY-LF-Z operates from -20°C to 85°C. The LT3760IFE#PBF extends to -40°C to 125°C, suitable for wider environmental conditions. The TPS61199PWPR operates from -40°C to 85°C. Application environment specifications must align with the selected part's temperature rating.