MP3388SGR-P LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3388SGR-P is an active LED driver IC manufactured by Monolithic Power Systems Inc., designed for backlight applications requiring multiple output channels with PWM dimming capability. This device functions as a DC-DC step-up (boost) regulator with 8 independent outputs, each capable of delivering 20mA at up to 50V output voltage. The part is in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent functional performance is required due to inventory constraints, design flexibility, or application-specific parameter optimization within the allowed electrical and mechanical specifications for LED driver ICs in this category.

Substiute Parts

MP3388SGR-P

Monolithic Power Systems Inc.In Stock: 914MP3388SGR-P Datasheet

Current PartRFQ

ISL97678IRZ

Renesas Electronics CorporationIn Stock: 6599ISL97678IRZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ISL97678IRZ from Renesas Electronics Corporation qualifies as a substitute for the MP3388SGR-P based on the following alignment of critical electrical and mechanical parameters:

Functional Equivalence Criteria:

• Identical topology: Step-Up (Boost) DC-DC regulator
• Matching output channel count: 8 independent outputs
• Compatible dimming method: PWM
• Identical application category: Backlight LED driver
• Overlapping supply voltage range: Both accept 4.3V–26V input (ISL97678IRZ minimum 4.75V exceeds MP3388SGR-P minimum 4.3V)
• Output voltage capability: ISL97678IRZ 45V output meets or exceeds MP3388SGR-P 50V requirement within acceptable tolerance
• Internal switching topology: Both include integrated switches
• Surface mount configuration: Both are surface-mount devices
• Regulatory compliance: Both ROHS3 compliant and REACH unaffected

Parameter Variance Allowances:

• Current per channel: ISL97678IRZ provides 50mA versus MP3388SGR-P 20mA (higher capacity is acceptable for substitution)
• Operating frequency: ISL97678IRZ 500kHz–1.5MHz range encompasses MP3388SGR-P 1.25MHz fixed frequency
• Package size: ISL97678IRZ uses 32-QFN (5x5) versus MP3388SGR-P 24-QFN (4x4) (requires PCB layout verification)
• Operating temperature range: ISL97678IRZ -40°C to 85°C (TA) versus MP3388SGR-P -40°C to 125°C (TJ) (narrower range requires application verification)
• Moisture sensitivity: ISL97678IRZ MSL 3 (168 hours) versus MP3388SGR-P MSL 1 (unlimited) (stricter handling requirements)

Parameter Comparison

Engineering Selection Recommendations

MP3388SGR-P Selection Criteria:

• Applications requiring output voltage up to 50V
• Designs with operating temperature requirements above 85°C
• Unlimited moisture sensitivity handling preferred (MSL 1)
• Compact PCB layout with 24-QFN (4x4) package constraint
• Fixed 1.25MHz switching frequency requirement
• 20mA per-channel current specification

ISL97678IRZ Selection Criteria:

• Applications where 45V output voltage is sufficient
• Operating temperature range limited to -40°C to 85°C
• Higher per-channel current capacity (50mA) beneficial for application
• PCB layout accommodates 32-QFN (5x5) package footprint
• Flexible switching frequency within 500kHz–1.5MHz range acceptable
• Moisture-controlled storage environment available (MSL 3, 168-hour limit)
• Renesas Electronics supply chain preferred

Both parts maintain active production status and full RoHS3 compliance, supporting long-term design reliability and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can ISL97678IRZ directly replace MP3388SGR-P without PCB redesign?

A: No. The ISL97678IRZ uses a 32-QFN (5x5) package versus the MP3388SGR-P 24-QFN (4x4) package. PCB layout modification is required, including pad pattern changes, trace routing, and thermal management area adjustment. Pin-to-pin compatibility is not guaranteed.

Q: What is the impact of ISL97678IRZ's 45V maximum output versus MP3388SGR-P's 50V?

A: Applications requiring output voltages above 45V cannot use ISL97678IRZ. For designs operating at or below 45V, the ISL97678IRZ is suitable. Verify actual application voltage requirements before substitution.

Q: Does the higher current rating (50mA) of ISL97678IRZ affect compatibility?

A: Higher current capacity is not a compatibility issue. The ISL97678IRZ can deliver up to 50mA per channel, while MP3388SGR-P delivers 20mA per channel. Applications designed for 20mA operation will function correctly with ISL97678IRZ. No circuit modification is required for current compatibility.

Q: How does the operating temperature difference affect substitution?

A: MP3388SGR-P operates to 125°C (junction temperature), while ISL97678IRZ operates to 85°C (ambient temperature). Applications requiring operation above 85°C ambient or with junction temperatures exceeding 85°C must use MP3388SGR-P. Verify thermal conditions in your application before selecting ISL97678IRZ.

Q: What does MSL 3 (168 hours) mean for ISL97678IRZ handling?

A: MSL 3 requires that the component be used within 168 hours (7 days) of package opening in standard humidity conditions. MP3388SGR-P with MSL 1 has unlimited shelf life after opening. ISL97678IRZ requires controlled storage and faster assembly scheduling. Verify manufacturing and assembly timelines support this requirement.

Q: Are there pin-count differences between these parts?

A: Yes. MP3388SGR-P is 24-pin QFN; ISL97678IRZ is 32-pin QFN. Pin assignments differ. Schematic and PCB redesign is mandatory for substitution.

Q: Do both parts support PWM dimming identically?

A: Both parts support PWM dimming control. However, the different package sizes, pin counts, and control pin assignments require verification of dimming signal routing and control circuit compatibility during redesign.

Q: Which part should be selected for new designs?

A: For new designs, evaluate application requirements against the parameter comparison table. If output voltage must reach 50V or operating temperature exceeds 85°C, use MP3388SGR-P. If 45V output and 85°C maximum temperature are acceptable, ISL97678IRZ offers higher per-channel current capacity and Renesas supply chain availability.