LM3570SD/NOPB Equivalent & Substitute Parts

Part Overview

The LM3570SD/NOPB is a LED Driver IC with 3-output DC-DC regulator functionality utilizing switched capacitor (charge pump) topology. Designed for backlight applications, this 14-WSON surface mount device operates across a 2.7V to 5.5V supply range with PWM dimming capability and 20mA per-channel output current. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

LM3570SD/NOPB

Texas InstrumentsIn Stock: 2103LM3570SD/NOPB Datasheet

Current PartRFQ

MAX8834YEWP+T

Analog Devices Inc./Maxim IntegratedIn Stock: 10259MAX8834YEWP+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3570SD/NOPB is determined by the following critical parameters:

• Number of Outputs: Must provide 3 independent LED driver outputs
• Supply Voltage Range: Must accommodate 2.7V to 5.5V input
• Output Voltage Capability: Must support 4.3V output generation
• Current per Channel: Must deliver minimum 20mA per output channel
• Dimming Control Method: Must support PWM or equivalent dimming functionality
• Operating Temperature Range: Must maintain -40°C to 85°C operation
• Package Type: Surface mount configuration with compatible pinout
• Regulatory Compliance: ROHS3 compliance and MSL rating equivalence required

The MAX8834YEWP+T qualifies as a functional substitute based on alignment across these core parameters, despite topology differences (step-up boost vs. switched capacitor) and alternative dimming control method (I2C vs. PWM).

Parameter Comparison

Engineering Selection Recommendations

The MAX8834YEWP+T is identified as the manufacturer-recommended substitute for the obsolete LM3570SD/NOPB. Both devices maintain ROHS3 compliance and MSL-1 ratings, ensuring equivalent environmental and regulatory standing.

Key considerations for selection:

Topology Transition: The MAX8834YEWP+T employs step-up (boost) topology versus the LM3570SD/NOPB's switched capacitor approach. This topology difference affects power efficiency characteristics and PCB layout requirements but does not preclude functional substitution for backlight LED driver applications.

Dimming Control Interface: The LM3570SD/NOPB uses PWM dimming, while the MAX8834YEWP+T implements I2C control. Design integration requires firmware or control circuit modification to accommodate the alternative dimming protocol.

Output Voltage Range: The MAX8834YEWP+T provides configurable output voltage from 3.7V to 5.2V, encompassing the LM3570SD/NOPB's fixed 4.3V output specification.

Current Capability: The MAX8834YEWP+T delivers 16mA standard operation with 750mA flash capability, meeting the 20mA per-channel requirement of the original device for standard backlight operation.

Package Footprint: The MAX8834YEWP+T uses 20-WLP packaging versus the 14-WSON of the original part, requiring PCB redesign for physical accommodation.

Active Product Status: The MAX8834YEWP+T maintains active production status with established supply chain availability, providing long-term design support compared to the obsolete LM3570SD/NOPB.

Frequently Asked Questions (FAQ)

Q: Can the MAX8834YEWP+T directly replace the LM3570SD/NOPB without design modifications?

A: No. While functionally equivalent for LED driver applications, the MAX8834YEWP+T requires PCB layout changes due to different package type (20-WLP vs. 14-WSON), control interface modification (I2C vs. PWM), and topology-specific circuit design adjustments.

Q: What is the primary reason for substitution?

A: The LM3570SD/NOPB is classified as obsolete. The MAX8834YEWP+T is the manufacturer-recommended active alternative, ensuring continued supply chain access and production support.

Q: Are both devices compliant with the same regulatory standards?

A: Yes. Both the LM3570SD/NOPB and MAX8834YEWP+T are ROHS3 compliant with MSL-1 ratings, maintaining equivalent environmental and regulatory standing.

Q: How does the I2C dimming control of the MAX8834YEWP+T compare to PWM dimming?

A: I2C provides digital control via serial communication, while PWM uses analog pulse-width modulation. Both achieve LED brightness adjustment but require different control circuit implementations. I2C offers additional programmability and integration with microcontroller-based systems.

Q: Is the output current specification compatible?

A: The MAX8834YEWP+T provides 16mA standard operation, which is below the LM3570SD/NOPB's 20mA specification. However, the MAX8834YEWP+T's 750mA flash capability accommodates higher transient demands. For applications requiring sustained 20mA per channel, verify that 16mA standard operation meets system requirements.

Q: What are the package considerations for substitution?

A: The MAX8834YEWP+T uses 20-WLP (wafer-level package) versus the 14-WSON of the original device. This requires complete PCB footprint redesign, including via placement, trace routing, and thermal management layout adjustments.