LP3952RL/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP3952RL/NOPB is a 6-output LED driver IC with integrated DC-DC step-up (boost) regulator manufactured by Texas Instruments. This device is designed for backlight applications with PWM dimming capability, operating from a 3V to 5.5V supply and delivering 5.3V output at 40mA per channel. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Substiute Parts

LP3952RL/NOPB

Texas InstrumentsIn Stock: 2068LP3952RL/NOPB Datasheet

Current PartRFQ

ISL97693IRTZ-TK

Renesas Electronics CorporationIn Stock: 770ISL97693IRTZ-TK Datasheet

MFR RecommendedRFQ

ISL97694AIRTZ

Renesas Electronics CorporationIn Stock: 2031ISL97694AIRTZ Datasheet

MFR RecommendedRFQ

LT3598EFE#PBF

Analog Devices Inc.In Stock: 2298LT3598EFE#PBF Datasheet

MFR RecommendedRFQ

MPQ3387LGRT-P

Monolithic Power SystemsIn Stock: 663MPQ3387LGRT-P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3952RL/NOPB is determined by the following critical parameters:

• Topology: Step-Up (Boost) DC-DC regulator with 6 outputs
• Supply Voltage Range: 3V to 5.5V input compatibility
• Output Voltage: Capable of delivering 5.3V or higher
• Current per Channel: Minimum 40mA output capability
• Dimming Method: PWM dimming support
• Application: LED backlight driver
• Mounting: Surface mount package
• Compliance: ROHS3 compliant

The substitute parts listed below meet these core functional requirements while accommodating variations in package type, frequency range, and extended operating temperature ranges. All substitutes maintain the 6-output LED driver architecture and step-up topology essential for backlight applications.

Parameter Comparison

Engineering Selection Recommendations

ISL97693IRTZ-TK and ISL97694AIRTZ (Renesas Electronics): Both devices are active products with 6-output step-up topology and PWM dimming. The ISL97693IRTZ-TK uses a 16-TQFN package, while the ISL97694AIRTZ uses a 20-QFN package. Both support the 3V to 5.5V supply range and deliver higher output voltage (26V) than the original part. Current per channel is 30mA, which is lower than the LP3952RL/NOPB. These parts are suitable for applications where the higher output voltage and active product status are advantageous.

LT3598EFE#PBF (Analog Devices Inc.): This active product offers extended supply voltage range (3V to 30V) and higher output voltage capability (44V). It supports both analog and PWM dimming, providing greater flexibility. Operating temperature extends to 125°C (TJ). The 24-TSSOP package differs from the original BGA package. Current per channel is 30mA. This part is recommended for designs requiring extended temperature range and higher output voltage capability.

MPQ3387LGRT-P (Monolithic Power Systems): This active product features 45mA per channel output current, exceeding the LP3952RL/NOPB specification. It supports both analog and PWM dimming and includes automotive-grade qualification (AEC-Q100). The 24-TQFN package provides a different form factor. Supply voltage range is 3V to 25V with 45V output capability. This part is suitable for automotive backlight applications requiring higher current delivery.

All substitute parts maintain ROHS3 compliance and are currently in active production status, ensuring long-term availability compared to the obsolete LP3952RL/NOPB.

Frequently Asked Questions (FAQ)

Q: Can ISL97693IRTZ-TK or ISL97694AIRTZ directly replace the LP3952RL/NOPB?

A: Both Renesas parts maintain the 6-output step-up topology and PWM dimming required for backlight applications. However, the output current per channel is 30mA versus 40mA on the original part. Package differences (16-TQFN and 20-QFN versus 36-DSBGA) require PCB layout redesign. Output voltage capability is higher (26V versus 5.3V), which may require output voltage adjustment in the application circuit.

Q: What is the primary difference between LT3598EFE#PBF and the original LP3952RL/NOPB?

A: The LT3598EFE#PBF supports extended supply voltage (up to 30V versus 5.5V) and higher output voltage (44V versus 5.3V). It offers both analog and PWM dimming versus PWM-only on the original part. Operating temperature range extends to 125°C. The 24-TSSOP package requires PCB redesign. Output current per channel is 30mA.

Q: Why does MPQ3387LGRT-P have higher output current than the original part?

A: The MPQ3387LGRT-P is rated for 45mA per channel, exceeding the LP3952RL/NOPB specification of 40mA. This higher current capability provides design margin and is suitable for applications requiring increased LED brightness or additional LED strings per channel.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (ISL97693IRTZ-TK, ISL97694AIRTZ, LT3598EFE#PBF, and MPQ3387LGRT-P) are ROHS3 compliant, matching the compliance status of the original LP3952RL/NOPB.

Q: What packaging considerations apply when switching from LP3952RL/NOPB to a substitute?

A: The LP3952RL/NOPB uses a 36-DSBGA package. Substitute parts use different packages: ISL97693IRTZ-TK (16-TQFN), ISL97694AIRTZ (20-QFN), LT3598EFE#PBF (24-TSSOP), and MPQ3387LGRT-P (24-TQFN). Each package change requires PCB layout redesign, including trace routing, decoupling capacitor placement, and thermal management considerations.

Q: Which substitute part is recommended for automotive applications?

A: The MPQ3387LGRT-P includes automotive-grade qualification (AEC-Q100), making it the appropriate choice for automotive backlight applications. This part also delivers the highest output current per channel (45mA) among the substitutes.

Q: Do all substitute parts support PWM dimming?

A: Yes. All substitute parts support PWM dimming. Additionally, LT3598EFE#PBF and MPQ3387LGRT-P support both analog and PWM dimming, providing additional flexibility for dimming control implementation.