MSL1064AW LED Driver IC Equivalent & Substitute Parts

Part Overview

The MSL1064AW is a 6-output LED driver IC manufactured by Microchip Technology, designed for backlight applications with a Step-Up (Boost) topology. This device operates from a 4.75V to 36V supply and delivers 48V output at 30mA per channel with analog and PWM dimming capabilities in a 24-TQFN (5x5) package.

The MSL1064AW is classified as obsolete. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications requiring LED driver functionality with comparable electrical and mechanical specifications.

Substiute Parts

MSL1064AW

Microchip TechnologyIn Stock: 835MSL1064AW Datasheet

Current PartRFQ

LM27966SQ/NOPB

Texas InstrumentsIn Stock: 1485LM27966SQ/NOPB Datasheet

MFR RecommendedRFQ

LP8557IAYFQR

Texas InstrumentsIn Stock: 26155LP8557IAYFQR Datasheet

MFR RecommendedRFQ

MPQ3387LGRT-P

Monolithic Power SystemsIn Stock: 663MPQ3387LGRT-P Datasheet

MFR RecommendedRFQ

TPS61181RTET

Texas InstrumentsIn Stock: 2091TPS61181RTET Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MSL1064AW are evaluated based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Number of Outputs: 6 channels required
• Topology: Step-Up (Boost) converter preferred for voltage elevation capability
• Dimming Control: Analog and/or PWM dimming support
• Output Voltage Range: Capability to reach or exceed 48V
• Current per Channel: Minimum 25mA to 30mA per output
• Package Type: Surface mount with exposed pad configuration
• Operating Temperature Range: Support for -40°C to 85°C or equivalent
• RoHS Compliance: ROHS3 Compliant

Substitution Groups:

Group 1 - Direct Topology Match (Step-Up Boost): LP8557IAYFQR, TPS61181RTET, and MPQ3387LGRT-P maintain the Step-Up (Boost) topology with 6 outputs and PWM dimming capability. These parts support comparable output voltage levels and current ratings.

Group 2 - Alternative Topology (Switched Capacitor): LM27966SQ/NOPB uses Switched Capacitor (Charge Pump) topology with 6 outputs and I2C dimming control. This topology differs fundamentally from the boost converter but serves LED driver applications with different voltage and current characteristics.

Parameter Comparison

Engineering Selection Recommendations

LP8557IAYFQR (Texas Instruments)

Status: Active. This part maintains Step-Up (Boost) topology with 6 outputs and PWM dimming. Output voltage of 28V is lower than the MSL1064AW's 48V specification. Current per channel is 25mA versus 30mA. Package is 16-DSBGA, which differs from the 24-TQFN form factor. MSL rating of 1 (Unlimited) provides superior moisture handling compared to MSL 3. ROHS3 compliant.

LM27966SQ/NOPB (Texas Instruments)

Status: Active. This part uses Switched Capacitor (Charge Pump) topology, fundamentally different from the boost converter approach. Output voltage range of 2V to 4V is incompatible with the 48V requirement. Dimming control is I2C-based rather than analog/PWM. Current per channel matches at 30mA. Package is 24-WFQFN (4x4), similar form factor to the original. MSL rating of 1 (Unlimited) and ROHS3 compliant. This part is suitable only for applications with significantly different voltage and control requirements.

MPQ3387LGRT-P (Monolithic Power Systems)

Status: Active. This part maintains Step-Up (Boost) topology with 6 outputs and analog/PWM dimming control. Output voltage of 45V closely matches the 48V specification. Current per channel is 45mA, exceeding the 30mA requirement. Operating frequency range of 24kHz to 27.5kHz differs from the 1.1MHz of the original. Package is 24-TQFN (4x4), similar to the original 24-TQFN form factor. Includes AEC-Q100 automotive qualification. MSL rating of 1 (Unlimited) and ROHS3 compliant.

TPS61181RTET (Texas Instruments)

Status: Active. This part maintains Step-Up (Boost) topology with 6 outputs and PWM dimming. Output voltage of 38V is lower than the 48V specification. Current per channel is 25mA versus 30mA. Operating frequency is 1MHz, closely matching the 1.1MHz of the original. Package is 16-WQFN (3x3), a smaller form factor than the 24-TQFN original. Operating temperature range of -40°C to 85°C matches the original. MSL rating of 2 (1 Year) and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can LP8557IAYFQR directly replace MSL1064AW in existing designs?

A: LP8557IAYFQR shares the Step-Up (Boost) topology and 6-output configuration with PWM dimming. However, the output voltage of 28V is significantly lower than the MSL1064AW's 48V, and the 16-DSBGA package differs from the 24-TQFN form factor. PCB layout redesign is required.

Q: What is the primary difference between LM27966SQ/NOPB and the other substitutes?

A: LM27966SQ/NOPB uses Switched Capacitor (Charge Pump) topology instead of Step-Up (Boost). This topology is fundamentally different and produces output voltages of 2V to 4V, making it unsuitable for applications requiring 48V output. Dimming control is I2C-based rather than analog/PWM.

Q: Which substitute offers the closest electrical match to MSL1064AW?

A: MPQ3387LGRT-P provides the closest match with Step-Up (Boost) topology, 6 outputs, analog/PWM dimming, and output voltage of 45V (versus 48V). Current per channel is 45mA, exceeding the 30mA requirement. The 24-TQFN (4x4) package is similar to the original form factor.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts—LP8557IAYFQR, LM27966SQ/NOPB, MPQ3387LGRT-P, and TPS61181RTET—are ROHS3 compliant.

Q: What are the moisture sensitivity considerations for these substitutes?

A: MSL1064AW has MSL rating of 3 (168 Hours). Substitutes offer improved moisture handling: LP8557IAYFQR and LM27966SQ/NOPB have MSL 1 (Unlimited), MPQ3387LGRT-P has MSL 1 (Unlimited), and TPS61181RTET has MSL 2 (1 Year). Lower MSL ratings indicate better moisture resistance and longer shelf life.

Q: Does TPS61181RTET support analog dimming like the MSL1064AW?

A: No. TPS61181RTET supports PWM dimming only. The MSL1064AW supports both analog and PWM dimming. If analog dimming is required, MPQ3387LGRT-P is the appropriate substitute, as it supports both analog and PWM dimming modes.

Q: What package considerations apply when selecting a substitute?

A: MSL1064AW uses 24-TQFN (5x5). MPQ3387LGRT-P uses 24-TQFN (4x4), requiring minimal PCB layout adjustment. TPS61181RTET uses 16-WQFN (3x3), a significantly smaller package requiring substantial redesign. LP8557IAYFQR uses 16-DSBGA, a ball grid array package requiring different assembly processes.

Q: Is MPQ3387LGRT-P suitable for automotive applications?

A: Yes. MPQ3387LGRT-P includes AEC-Q100 automotive qualification, making it suitable for automotive-grade LED driver applications. Other substitutes do not carry automotive qualification.