LP8556TME-E07/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP8556TME-E07/NOPB is an active-status LED Driver IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device functions as a 6-output DC-DC Step-Up (Boost) regulator with integrated PWM and I2C dimming control, designed for backlight applications. The part is supplied in a 20-DSBGA package and maintains RoHS3 compliance with MSL Level 1 rating. Substitute parts are identified when equivalent functional specifications, output configurations, and electrical operating ranges are available from alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Substiute Parts

LP8556TME-E07/NOPB

Texas InstrumentsIn Stock: 1141LP8556TME-E07/NOPB Datasheet

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ISL97671AIRZ

Renesas Electronics CorporationIn Stock: 23430ISL97671AIRZ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP8556TME-E07/NOPB are identified based on the following critical parameters that define functional equivalence:

Core Functional Requirements:

• DC-DC Step-Up (Boost) topology with internal switching capability
• 6 independent output channels
• 50mA output current per channel
• Backlight application suitability
• Surface mount technology

Electrical Operating Range Compatibility:

• Input voltage supply range overlap or compatibility with 2.7V to 20V specification
• Output voltage capability within or exceeding 7V to 43V range
• Switching frequency operation in the 300kHz to 1.25MHz band

Control Interface Compatibility:

• PWM dimming capability (mandatory for all substitutes)
• I2C interface support (preferred but not mandatory for basic substitution)

Compliance and Reliability:

• Active product status
• RoHS3 compliance
• Suitable moisture sensitivity level for intended application

The ISL97671AIRZ from Renesas Electronics Corporation meets the core functional requirements of 6-output boost regulation with 50mA per-channel capability and PWM dimming control. Differences in input voltage range, output voltage specification, switching frequency, and package type are documented in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

LP8556TME-E07/NOPB Selection Criteria:

The LP8556TME-E07/NOPB is the primary choice when the following conditions apply:

• Input voltage supply range must include operation below 4.5V (down to 2.7V minimum)
• I2C digital dimming interface is required for system integration
• Moisture-sensitive applications require MSL Level 1 rating
• DSBGA package footprint is specified in PCB design
• Operating temperature range must extend to -30°C minimum

ISL97671AIRZ Selection Criteria:

The ISL97671AIRZ from Renesas Electronics serves as a functional substitute when:

• Input voltage supply operates within 4.5V to 26.5V range
• PWM dimming control is sufficient for application requirements
• Higher input voltage ceiling (26.5V vs. 20V) provides design margin
• QFN package format is compatible with PCB layout
• Extended operating temperature range (-40°C to 85°C) is beneficial
• Higher inventory availability (23,400 pcs vs. 1,034 pcs) supports procurement needs

Compliance Alignment:

Both parts maintain active product status and RoHS3 compliance, ensuring long-term supply viability and regulatory conformance. The ISL97671AIRZ carries REACH Unaffected status and EAR99 ECCN classification, providing additional regulatory clarity for international applications.

Frequently Asked Questions (FAQ)

Q1: Can the ISL97671AIRZ directly replace the LP8556TME-E07/NOPB in all applications?

A: Direct replacement is possible only when the application does not require I2C dimming control and input voltage remains above 4.5V. The ISL97671AIRZ supports PWM dimming exclusively. If I2C interface is mandatory, the LP8556TME-E07/NOPB must be retained. Package differences (DSBGA vs. QFN) require PCB redesign.

Q2: What is the impact of the different input voltage ranges?

A: The LP8556TME-E07/NOPB operates from 2.7V minimum, while the ISL97671AIRZ requires 4.5V minimum. Applications powered by single-cell lithium batteries or low-voltage sources below 4.5V cannot use the ISL97671AIRZ. The ISL97671AIRZ supports higher input voltage (26.5V vs. 20V), providing additional headroom for higher-voltage supply designs.

Q3: Are the package types interchangeable?

A: No. The LP8556TME-E07/NOPB uses 20-DSBGA (2.04x1.78mm) while the ISL97671AIRZ uses 20-VFQFN (3x4mm). Different footprints, pin layouts, and solder pad configurations require complete PCB redesign. Package selection is determined by PCB space constraints and manufacturing capabilities.

Q4: What is the significance of MSL rating differences?

A: The LP8556TME-E07/NOPB carries MSL Level 1 (unlimited shelf life), while the ISL97671AIRZ carries MSL Level 3 (168-hour limit after moisture exposure). For high-volume manufacturing with extended component storage, the LP8556TME-E07/NOPB offers lower risk of moisture-related failures. The ISL97671AIRZ requires stricter moisture control and shorter time-to-assembly windows.

Q5: How do dimming control differences affect system design?

A: The LP8556TME-E07/NOPB supports both I2C and PWM dimming, enabling digital brightness control via microcontroller I2C bus or analog PWM signals. The ISL97671AIRZ supports PWM dimming only, requiring dedicated PWM signal generation. Systems requiring digital I2C brightness adjustment must use the LP8556TME-E07/NOPB.

Q6: What are the switching frequency implications?

A: The LP8556TME-E07/NOPB offers three selectable frequencies (312kHz, 625kHz, 1.25MHz), while the ISL97671AIRZ operates at 600kHz or 1.14MHz. Higher switching frequencies reduce inductor and capacitor sizes but increase switching losses. Frequency selection impacts PCB layout, EMI performance, and component thermal management.

Q7: Is the extended temperature range of the ISL97671AIRZ (-40°C vs. -30°C) significant?

A: The ISL97671AIRZ supports -40°C minimum operation, providing 10°C additional margin for cold-environment applications. The LP8556TME-E07/NOPB is rated to -30°C. For automotive or outdoor applications requiring operation below -30°C, the ISL97671AIRZ offers superior temperature coverage.