MP3398LGS-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3398LGS-Z is a 4-output LED driver controller manufactured by Monolithic Power Systems Inc., designed for backlight applications requiring step-up (boost) topology DC-DC conversion. This Active product operates across a 4.5V to 28V supply range with 350mA per-channel output capability and supports both analog and PWM dimming control. The device is packaged in a 16-SOIC surface-mount configuration and is ROHS3 compliant.

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for LED driver controller applications, accounting for variations in supply voltage tolerance, output current capacity, frequency range, package form factor, and product lifecycle status.

Substiute Parts

MP3398LGS-Z

Monolithic Power Systems Inc.In Stock: 819MP3398LGS-Z Datasheet

Current PartRFQ

ISL97687IBZ-T

Renesas Electronics CorporationIn Stock: 1185ISL97687IBZ-T Datasheet

MFR RecommendedRFQ

SC5012QMLTRT

Semtech CorporationIn Stock: 16090SC5012QMLTRT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP3398LGS-Z is determined by the following critical parameters:

• Topology: Must be Step-Up (Boost) DC-DC controller
• Number of Outputs: Must be 4-output configuration
• Dimming Support: Must support Analog and PWM dimming
• Application: Must be suitable for backlight LED driver applications
• Supply Voltage Range: Must accommodate the operating supply voltage requirements
• Output Current: Must meet or exceed per-channel current delivery needs
• Package Type: Surface-mount packages acceptable; form factor variations permitted based on PCB layout compatibility
• Compliance: Must maintain ROHS3 or equivalent environmental compliance

The identified substitute parts (ISL97687IBZ-T and SC5012QMLTRT) satisfy these core functional and electrical requirements while operating within acceptable parameter tolerances for LED driver controller applications.

Parameter Comparison

Engineering Selection Recommendations

ISL97687IBZ-T (Renesas Electronics Corporation)

This part maintains Active product status and ROHS3 compliance. The minimum supply voltage requirement of 9V represents a constraint compared to the MP3398LGS-Z 4.5V minimum; applications requiring operation below 9V cannot use this substitute. Output current per channel is reduced to 160mA versus 350mA on the primary part. The 28-SOIC package requires PCB layout modification. Frequency range extends to 1.2MHz, providing operational flexibility. Operating temperature maximum is reduced to 105°C.

SC5012QMLTRT (Semtech Corporation)

This part carries a "Not For New Designs" product status designation, indicating it is in end-of-life phase. RoHS compliance is maintained. The 24-QFN (4x4) package differs significantly from the 16-SOIC form factor and requires redesigned PCB footprints. Output current per channel is 150mA, the lowest among the three options. Supply voltage range extends to 45V maximum with specified 65V output capability. Frequency range reaches 2.2MHz. MSL rating of 1 (Unlimited) provides superior moisture handling compared to alternatives.

For new designs, ISL97687IBZ-T is preferred due to Active status. SC5012QMLTRT substitution is acceptable only for legacy or end-of-life product support where new design constraints do not apply.

Frequently Asked Questions (FAQ)

Q: Can ISL97687IBZ-T replace MP3398LGS-Z in all applications?

A: No. ISL97687IBZ-T requires a minimum supply voltage of 9V, whereas MP3398LGS-Z operates from 4.5V. Applications with supply voltages between 4.5V and 9V cannot use ISL97687IBZ-T. Additionally, output current per channel is reduced from 350mA to 160mA, limiting use in high-current LED string applications.

Q: What are the package compatibility implications?

A: MP3398LGS-Z uses 16-SOIC packaging. ISL97687IBZ-T uses 28-SOIC, and SC5012QMLTRT uses 24-QFN (4x4). These are not pin-compatible. PCB redesign is required for either substitute, including new footprint layout, trace routing, and potentially different component placement strategies.

Q: Why is SC5012QMLTRT marked "Not For New Designs"?

A: This designation indicates the part is in end-of-life phase and Semtech does not recommend its use in new product development. It remains available for legacy product support and maintenance applications only.

Q: Are all three parts ROHS3 compliant?

A: MP3398LGS-Z and ISL97687IBZ-T are explicitly ROHS3 compliant. SC5012QMLTRT is RoHS compliant but not specifically designated as ROHS3. Verify compliance requirements for your specific application before selection.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: MSL ratings indicate moisture exposure limits during storage and handling. MP3398LGS-Z has MSL 2 (1 Year), ISL97687IBZ-T has MSL 3 (168 Hours), and SC5012QMLTRT has MSL 1 (Unlimited). Lower MSL numbers require shorter shelf life management and more careful handling protocols.

Q: Can output current requirements be met by any substitute?

A: No. If your application requires 350mA per channel, neither substitute is adequate. ISL97687IBZ-T provides 160mA and SC5012QMLTRT provides 150mA per channel. Parallel channel configuration or alternative controller selection is necessary for higher current demands.