LDS8726 LED Driver IC Equivalent & Substitute Parts

Part Overview

The LDS8726 is an LED Driver IC manufactured by IXYS Integrated Circuits Division, designed as a 1-output DC-DC regulator with step-up (boost) topology, PWM dimming capability, and 1.9A switch current rating in an 8-TDFN (2x3) surface mount package. The device operates across a 2.7V to 5.5V supply range and is optimized for backlight applications.

The LDS8726 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

LDS8726

IXYS Integrated Circuits DivisionIn Stock: 771LDS8726 Datasheet

Current PartRFQ

LM3406HVQMHXQ1

Texas InstrumentsIn Stock: 7096LM3406HVQMHXQ1 Datasheet

MFR RecommendedRFQ

LM36011YKBR

Texas InstrumentsIn Stock: 125355LM36011YKBR Datasheet

MFR RecommendedRFQ

LT3592IMSE#PBF

Analog Devices Inc.In Stock: 2063LT3592IMSE#PBF Datasheet

MFR RecommendedRFQ

MP24875DN-LF-Z

Monolithic Power Systems Inc.In Stock: 55307MP24875DN-LF-Z Datasheet

MFR RecommendedRFQ

MP3309GQG-Z

Monolithic Power Systems Inc.In Stock: 63925MP3309GQG-Z Datasheet

MFR RecommendedRFQ

MP4689DN-LF

Monolithic Power SystemsIn Stock: 705MP4689DN-LF Datasheet

MFR RecommendedRFQ

MPQ2483ADS-LF-Z

Monolithic Power Systems Inc.In Stock: 886MPQ2483ADS-LF-Z Datasheet

MFR RecommendedRFQ

NCP5030MTTXG

onsemiIn Stock: 16921NCP5030MTTXG Datasheet

MFR RecommendedRFQ

PAM2841GR

Diodes IncorporatedIn Stock: 3343PAM2841GR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the LDS8726 is based on the following critical parameters:

Primary Matching Criteria:

• Topology: Step-Up (Boost) DC-DC regulator with internal switch
• Supply voltage range: 2.7V to 5.5V minimum compatibility
• Output current capability: 1.5A or higher switch current
• Dimming capability: PWM support
• Package type: Surface mount, small form factor (8-pin or equivalent)
• Operating temperature range: -40°C to 85°C minimum

Acceptable Variations:

• Topology may include dual-mode (buck-boost) capability, provided boost mode meets specifications
• Output current may exceed 1.9A
• Operating temperature range may extend beyond -40°C to 85°C
• Package may differ if pin count and functionality remain compatible
• Frequency may vary within typical LED driver ranges (400kHz to 1MHz)

Substitutes are grouped into two categories:

1. Direct Boost Topology Substitutes (PAM2841GR, MP3309GQG-Z): Maintain step-up (boost) topology with matching supply voltage range and PWM dimming.

2. Buck Topology Substitutes (LM3406HVQMHXQ1, MP24875DN-LF-Z, MP4689DN-LF): Provide step-down (buck) regulation for applications where input voltage exceeds output requirements. These are suitable only when circuit topology permits buck conversion.

3. Dual-Mode Substitutes (MPQ2483ADS-LF-Z, NCP5030MTTXG): Support both buck and boost topologies, offering maximum design flexibility.

4. Linear Topology Substitute (LM36011YKBR): Constant-current linear driver for applications requiring precise LED current control without switching regulation.

5. Specialized Substitute (LT3592IMSE#PBF): Buck topology with extended voltage range and lower current rating, suitable for specific lighting applications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Boost Topology, 2.7V–5.5V Supply):

PAM2841GR is the primary equivalent substitute. It maintains identical topology (step-up boost), supply voltage range (2.7V–5.5V), package type (8-WFDFN), and PWM dimming capability. Current rating is 1.5A versus 1.9A; applications requiring the full 1.9A must be evaluated for thermal and current margin. PAM2841GR is active status with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and manufacturing compatibility.

MP3309GQG-Z provides an alternative boost topology substitute with higher current capability (1.5A) and extended operating temperature range (-40°C to 125°C). The 10-QFN package differs from the original 8-TDFN, requiring PCB layout modification. MP3309GQG-Z supports both analog and PWM dimming, offering enhanced flexibility. Product status is active with ROHS3 compliance.

For Buck Topology Applications (Input Voltage > Output Voltage):

MP24875DN-LF-Z is recommended for designs where step-down regulation is acceptable. It provides 1.5A switch current, PWM dimming, and automotive-grade qualification (AEC-Q100). Supply range is 4.5V–55V. The 8-SOIC package is compatible with standard PCB layouts. Product status is active with automotive qualification.

MP4689DN-LF offers 1A current capability in an 8-SOIC package with extended supply range (4.5V–95V) and automotive qualification. Operating temperature extends to 125°C. This device is suitable for lower-current LED driver applications.

For Dual-Mode Flexibility (Buck or Boost):

MPQ2483ADS-LF-Z supports both buck and boost topologies with 2.5A current capability, exceeding the original 1.9A specification. Supply range is 4.5V–55V with automotive qualification. The 14-SOIC package accommodates additional control features. Product status is active with ROHS3 compliance.

NCP5030MTTXG provides dual-mode (buck-boost) operation with 2.7V–5.5V supply range matching the original device. Current capability is 900mA, below the 1.9A specification; this device is suitable only for lower-power applications. Product status is obsolete; use only if supply chain constraints require it.

For Linear Constant-Current Applications:

LM36011YKBR is a linear constant-current driver without internal switching topology. It operates across 2.5V–5.5V supply range with 1.5A output current and supports both analog and PWM dimming. The 8-DSBGA package is significantly smaller than the original 8-TDFN. This device is suitable for precision LED current control in mobile communications and portable lighting applications. Product status is active with high inventory availability (125,300 pcs).

For Extended Voltage Range Applications:

LM3406HVQMHXQ1 is a buck-topology device with extended supply range (6V–75V) and automotive qualification (AEC-Q100). Operating temperature extends to 150°C. The 14-PowerTSSOP package is larger than the original 8-TDFN. This device is suitable for automotive and industrial lighting applications requiring higher input voltages. Product status is active.

LT3592IMSE#PBF is a buck-topology device with 3.6V–36V supply range and 50mA/500mA current options. The 10-MSOP package accommodates additional functionality. This device is suitable for specialized lighting applications with specific current requirements. Product status is active.

Compliance and Certification Summary:

All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification, matching the original LDS8726 regulatory status. Moisture sensitivity levels range from MSL 1 (unlimited) to MSL 2A (4 weeks); designs using MSL 2 devices require appropriate storage and handling protocols. Automotive-grade substitutes (MP24875DN-LF-Z, MP4689DN-LF, MPQ2483ADS-LF-Z, LM3406HVQMHXQ1) include AEC-Q100 qualification for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can PAM2841GR directly replace LDS8726 in all applications?

A: PAM2841GR is the closest functional equivalent, maintaining boost topology, 2.7V–5.5V supply range, 8-WFDFN package, and PWM dimming. The current rating is 1.5A versus 1.9A; applications operating near maximum current must be re-evaluated for thermal performance and current margin. Pin-for-pin compatibility requires verification against the original schematic.

Q: What is the difference between boost and buck topology substitutes?

A: Boost (step-up) topology increases voltage from input to output and is suitable when input voltage is lower than required output voltage. Buck (step-down) topology decreases voltage and is suitable when input voltage exceeds output requirements. The LDS8726 uses boost topology; buck substitutes require circuit redesign and are only applicable if the application permits step-down conversion.

Q: Why is NCP5030MTTXG listed as obsolete?

A: NCP5030MTTXG is classified as obsolete by the manufacturer, indicating discontinued production. Although 16,900 pcs remain in inventory, long-term availability is not guaranteed. This device should be used only as a temporary solution when other active-status alternatives are unavailable.

Q: Can I use LM36011YKBR as a direct replacement?

A: LM36011YKBR is a linear constant-current driver, not a switching regulator. It operates on fundamentally different principles than the LDS8726 boost converter. Use LM36011YKBR only if the application requires constant-current LED control rather than voltage regulation. The 8-DSBGA package is significantly smaller and requires PCB redesign.

Q: What are the package compatibility considerations?

A: The LDS8726 uses 8-WFDFN (2x3) package. Direct package-compatible substitutes are PAM2841GR (8-WFDFN) and NCP5030MTTXG (12-WFDFN). Other substitutes use different packages (10-QFN, 14-SOIC, 14-PowerTSSOP, 8-DSBGA, 10-MSOP) requiring PCB layout modification. Verify pinout and thermal pad requirements before redesign.

Q: Are automotive-grade substitutes necessary for non-automotive applications?

A: Automotive-grade devices (AEC-Q100 qualified) include enhanced reliability testing and extended operating temperature ranges. For non-automotive applications, standard-grade devices are acceptable. Automotive-grade substitutes offer additional margin and are suitable for harsh-environment or high-reliability applications.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL 1 (unlimited) devices have no moisture sensitivity restrictions and can be stored indefinitely under normal conditions. MSL 2 devices require controlled storage (1 year for MSL 2, 4 weeks for MSL 2A) and must be baked before reflow soldering if storage limits are exceeded. Verify storage conditions and handling protocols when selecting MSL 2 devices.

Q: Can MPQ2483ADS-LF-Z operate in both boost and buck modes?

A: Yes, MPQ2483ADS-LF-Z supports dual-mode operation (buck and boost). The topology is selectable through external component configuration. This flexibility allows single-device solutions for applications requiring either step-up or step-down conversion. Refer to the device datasheet for mode selection and external component requirements.

Q: What is the current availability status of substitute parts?

A: PAM2841GR (3,250 pcs), MP3309GQG-Z (63,900 pcs), LM3406HVQMHXQ1 (6,991 pcs), LM36011YKBR (125,300 pcs), LT3592IMSE#PBF (2,000 pcs), MP24875DN-LF-Z (55,200 pcs), MP4689DN-LF (689 pcs), MPQ2483ADS-LF-Z (780 pcs), and NCP5030MTTXG (16,900 pcs) are currently in stock. Inventory levels are subject to change; confirm availability with your component supplier before design commitment.