ISL97691IRTZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The ISL97691IRTZ is a 4-output LED driver IC manufactured by Renesas Electronics Corporation, designed for backlight applications. It functions as a step-up (boost) DC-DC regulator with analog and PWM dimming capabilities, delivering up to 60mA per channel at 26V output. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance.

Substiute Parts

ISL97691IRTZ

Renesas Electronics CorporationIn Stock: 985ISL97691IRTZ Datasheet

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ISL97692IRTZ-T

Renesas Electronics CorporationIn Stock: 17141ISL97692IRTZ-T Datasheet

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ADP5520ACPZ-RL

Analog Devices Inc.In Stock: 894ADP5520ACPZ-RL Datasheet

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LP8551TLX/NOPB

Texas InstrumentsIn Stock: 784LP8551TLX/NOPB Datasheet

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LP8553TLE/NOPB

Texas InstrumentsIn Stock: 1161LP8553TLE/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISL97691IRTZ is determined by the following critical parameters:

Primary Compatibility Criteria:

• 4-output LED driver topology (step-up/boost DC-DC regulator)
• Supply voltage range: 2.4V to 5.5V minimum compatibility
• Output voltage capability: 26V or higher
• Current delivery: 60mA per channel or higher
• Dimming control method: Analog or PWM
• Surface mount package with 16-pin or compatible pin count
• Operating temperature range: -40°C to 85°C
• RoHS3 compliance and MSL rating compatibility

Substitute parts are grouped based on their ability to meet these electrical and mechanical specifications while maintaining functional equivalence in backlight driver applications.

Parameter Comparison

Engineering Selection Recommendations

ISL97692IRTZ-T (Renesas Electronics Corporation)

This is the primary substitute for the ISL97691IRTZ. Both parts share identical electrical specifications except for output current per channel (40mA vs. 60mA). The ISL97692IRTZ-T is in active production status, ensuring long-term availability and supply chain stability. It maintains the same supply voltage range (2.4V to 5.5V), output voltage (26V), package format (16-TQFN 3x3), operating temperature range (-40°C to 85°C), and RoHS3 compliance. The reduced current rating may require design verification if the original application demands the full 60mA per channel.

ADP5520ACPZ-RL (Analog Devices Inc.)

This substitute offers active product status and compatible electrical performance with output voltage of 27V and current delivery of 14mA or 30mA per channel. The primary distinction is the control interface: the ADP5520ACPZ-RL uses I2C dimming control instead of analog/PWM. The package format differs (24-LFCSP-VQ 4x4 vs. 16-TQFN 3x3), requiring PCB layout modifications. Supply voltage range (2.7V to 5.5V) is compatible with the original specification. This option is suitable for applications where I2C control integration is feasible.

LP8551TLX/NOPB (Texas Instruments)

This substitute provides active product status with 4-output boost topology and PWM dimming control. Output voltage capability is 40V, exceeding the original 26V specification. Current per channel is 50mA, slightly below the original 60mA. Supply voltage range extends to 22V maximum, providing broader input compatibility. The package format is 25-DSBGA, requiring different PCB design considerations. Operating temperature range is -30°C to 85°C (narrower lower bound than original). MSL rating is 1 (Unlimited), offering superior moisture handling compared to the original MSL 3 rating.

LP8553TLE/NOPB (Texas Instruments)

This substitute is in active production with 4-output boost topology and PWM dimming control. It delivers 450mA per channel, significantly exceeding the original 60mA specification, making it suitable for higher-current backlight applications. Output voltage is 40V. Supply voltage range extends to 22V. Package format is 25-DSBGA. Operating temperature range is -30°C to 85°C. MSL rating is 1 (Unlimited). This option is appropriate when higher current delivery is required or beneficial for system design.

Frequently Asked Questions (FAQ)

Q: Can the ISL97692IRTZ-T directly replace the ISL97691IRTZ without design changes?

A: The ISL97692IRTZ-T is electrically compatible with the ISL97691IRTZ in the same package format (16-TQFN 3x3). The primary difference is reduced output current per channel (40mA vs. 60mA). If the original design operates at or below 40mA per channel, direct substitution is feasible. If the design requires the full 60mA per channel, circuit validation is necessary to confirm performance margins.

Q: Why do the Texas Instruments substitutes (LP8551TLX/NOPB and LP8553TLE/NOPB) have higher output voltage ratings?

A: The LP8551 and LP8553 series are designed for broader application ranges, including higher-voltage backlight systems. The 40V output capability provides design flexibility for applications requiring higher LED string voltages. If the original design specifies 26V output, the higher rating does not create incompatibility; the regulator can be configured to deliver the required voltage through external component selection.

Q: What are the package implications of switching to the ADP5520ACPZ-RL?

A: The ADP5520ACPZ-RL uses a 24-LFCSP-VQ (4x4) package instead of the 16-TQFN (3x3) format. This requires PCB layout redesign, including different pin assignments, trace routing, and thermal management considerations. The larger package footprint may impact board space allocation.

Q: How does the I2C control interface of the ADP5520ACPZ-RL differ from the analog/PWM control of the ISL97691IRTZ?

A: The ISL97691IRTZ uses analog voltage or PWM signals for brightness dimming control. The ADP5520ACPZ-RL uses I2C serial communication for dimming and configuration. This requires firmware or microcontroller changes to implement I2C protocol communication instead of direct analog or PWM signal generation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are RoHS3 compliant, matching the original ISL97691IRTZ specification. This ensures environmental and regulatory compatibility across all options.

Q: What is the significance of MSL rating differences between the original part and substitutes?

A: The ISL97691IRTZ has MSL 3 (168 hours), while the Texas Instruments substitutes (LP8551TLX/NOPB and LP8553TLE/NOPB) have MSL 1 (Unlimited). MSL rating indicates moisture sensitivity during storage and handling. MSL 1 provides superior moisture tolerance, reducing risk of moisture-induced failures during extended storage or humid environments. The Renesas ISL97692IRTZ-T maintains MSL 3, matching the original specification.

Q: Which substitute is recommended for new designs?

A: The ISL97692IRTZ-T is recommended as the primary choice for designs requiring direct compatibility with the ISL97691IRTZ footprint and control interface. For new designs with flexibility in package format and control method, the LP8553TLE/NOPB offers higher current capability and superior MSL rating. The ADP5520ACPZ-RL is suitable when I2C control integration aligns with system architecture.