LDS8724 LED Driver IC Equivalent & Substitute Parts

Part Overview

The LDS8724 is an LED Driver IC manufactured by IXYS Integrated Circuits Division, designed for backlight applications. It functions as a 1-output DC-DC Step-Up (Boost) regulator with PWM dimming capability, delivering 1.9A switch current in an 8-TDFN package. The device operates across a 2.7V to 5.5V supply range with 1MHz switching frequency and -40°C to 85°C temperature range.

The LDS8724 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring LED driver functionality with similar electrical and mechanical characteristics.

Key Parameters

Parameter	LDS8724 Specification
Manufacturer	IXYS Integrated Circuits Division
Product Status	Obsolete
Package Type	8-TDFN (2x3)
Topology	Step-Up (Boost)
Supply Voltage Range	2.7V to 5.5V
Output Current (Switch)	1.9A
Switching Frequency	1MHz
Dimming Control	PWM
Operating Temperature	-40°C to 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LDS8724 is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC regulator with internal switch
Supply voltage compatibility: 2.7V to 5.5V input range
Output current capability: Minimum 1.5A switch current (750mA minimum for reduced-current applications)
Dimming method: PWM or Analog/PWM control
Package type: Surface mount with exposed pad (8-TDFN, 8-DFN, or TSOT-23-6)
Operating temperature: -40°C to 85°C
Compliance: ROHS3 compliant, MSL 1 or equivalent

Secondary Considerations:

Switching frequency: 1MHz nominal (range 1MHz to 2.2MHz acceptable)
Application: Backlight LED driver
Certifications: REACH unaffected, EAR99 classification

Substitute parts are grouped into two categories based on current handling capability and package density:

Group A - High Current (1.5A to 1.9A): PAM2841GR, AP5724WUG-7, TPS61500PWP Group B - Reduced Current (20mA to 80mA): STLA02PUR, BU90030G-TR Group C - Alternative Topology/Application: LM3556TME/NOPB, MP24875DN-LF, MP46885DN-LF-Z, MP3416GJ-P

Parameter Comparison

Parameter	LDS8724	PAM2841GR	AP5724WUG-7	STLA02PUR	BU90030G-TR	TPS61500PWP	LM3556TME/NOPB
Manufacturer	IXYS	Diodes Inc.	Diodes Inc.	STMicroelectronics	Rohm Semi.	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Switched Capacitor	Step-Up (Boost)	Step-Up (Boost)
Supply Voltage (Min)	2.7V	2.7V	2.7V	2.5V	2V	2.9V	2.5V
Supply Voltage (Max)	5.5V	5.5V	5.5V	18V	4V	18V	5.5V
Output Current (Switch)	1.9A	1.5A	750mA	20mA	80mA	3A	1.5A (Flash)
Switching Frequency	1MHz	1MHz	1.2MHz	2MHz	1.5MHz	200kHz-2.2MHz	4MHz
Dimming Control	PWM	Analog, PWM	PWM	PWM	—	Analog, PWM	I2C
Package Type	8-TDFN (2x3)	8-DFN (2x2)	TSOT-23-6	6-DFN (2x2)	6-SSOP	14-HTSSOP	16-DSBGA
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-35°C to 85°C	-40°C to 85°C	-40°C to 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

PAM2841GR and AP5724WUG-7 are the closest functional equivalents to the LDS8724. Both are active products from established manufacturers with ROHS3 compliance and MSL 1 ratings. PAM2841GR delivers 1.5A switch current in an 8-DFN package with dual dimming control (Analog/PWM), matching the LDS8724's supply voltage range and operating temperature. AP5724WUG-7 provides 750mA in a smaller TSOT-23-6 package, suitable for lower-power backlight applications.

Secondary Substitutes (Conditional Use):

TPS61500PWP is an active Texas Instruments product offering 3A switch current with extended supply voltage range (2.9V to 18V) and flexible frequency control. Its 14-HTSSOP package is larger than the LDS8724 but provides superior current handling for demanding backlight applications. STLA02PUR and BU90030G-TR are suitable only for reduced-current LED driver applications (20mA and 80mA respectively) and should not be used as direct replacements for 1.9A applications.

Alternative Topology Substitutes:

LM3556TME/NOPB is an active Texas Instruments product with I2C dimming control and 1.5A flash current, designed for camera flash applications rather than backlight. MP24875DN-LF, MP46885DN-LF-Z, and MP3416GJ-P employ different topologies (Step-Down Buck or alternative boost configurations) and are suitable only for specialized lighting applications with different supply voltage requirements.

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 classification. Current inventory availability ranges from 685 to 3,250 pieces across active substitute options, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can AP5724WUG-7 directly replace LDS8724 in all applications?

A: AP5724WUG-7 is functionally compatible for backlight applications but delivers 750mA versus the LDS8724's 1.9A. Use AP5724WUG-7 only when application current requirements do not exceed 750mA. For full 1.9A capability, select PAM2841GR or TPS61500PWP.

Q: What is the primary difference between PAM2841GR and AP5724WUG-7?

A: PAM2841GR provides 1.5A switch current in an 8-DFN (2x2) package with dual dimming control. AP5724WUG-7 provides 750mA in a smaller TSOT-23-6 package. PAM2841GR is the preferred choice for applications requiring higher current density.

Q: Why is BU90030G-TR listed as a substitute if it uses Switched Capacitor topology instead of Step-Up Boost?

A: BU90030G-TR is included as a substitute for ultra-low-current backlight applications (80mA maximum). Its Switched Capacitor topology and 4V fixed output make it unsuitable for general LDS8724 replacement but acceptable for specific low-power LED driver designs.

Q: Are there package compatibility concerns when substituting LDS8724?

A: Yes. The LDS8724 uses 8-TDFN (2x3) packaging. PAM2841GR uses 8-DFN (2x2), AP5724WUG-7 uses TSOT-23-6, and TPS61500PWP uses 14-HTSSOP. PCB layout modifications are required for any package change. Verify footprint compatibility before design implementation.

Q: Can LM3556TME/NOPB replace LDS8724 in backlight applications?

A: LM3556TME/NOPB is designed for camera flash applications with I2C dimming control and 1.5A flash current. While it shares Step-Up topology and similar supply voltage range, its application focus and I2C interface differ from the LDS8724's PWM backlight control. Use only if I2C dimming control is required and application supports 16-DSBGA packaging.

Q: What is the impact of switching frequency differences between LDS8724 (1MHz) and substitutes?

A: Switching frequency affects inductor selection, output ripple, and EMI characteristics. Substitutes ranging from 1MHz to 2.2MHz are acceptable for backlight applications. Higher frequencies (TPS61500PWP at 2.2MHz maximum, LM3556TME/NOPB at 4MHz) reduce inductor size but may increase switching losses. Verify inductor and capacitor specifications for each substitute.

Q: Are all substitutes available in the same MSL rating as LDS8724?

A: LDS8724 has MSL 1 (Unlimited). Most substitutes (PAM2841GR, AP5724WUG-7, STLA02PUR, BU90030G-TR, LM3556TME/NOPB) maintain MSL 1. TPS61500PWP has MSL 2 (1 Year), requiring controlled storage conditions. Verify MSL requirements for your manufacturing environment.

Q: Which substitute offers the best current handling for high-brightness backlight applications?

A: TPS61500PWP delivers 3A switch current, exceeding the LDS8724's 1.9A capability. It is the optimal choice for high-brightness backlight designs requiring maximum current capacity. Its 14-HTSSOP package is larger than LDS8724 but provides superior thermal performance.

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