AP5725FDCG-7 Equivalent & Substitute Parts

Part Overview

The AP5725FDCG-7 is an LED Driver IC manufactured by Diodes Incorporated, functioning as a 1-output DC-DC regulator with step-up (boost) topology. This device integrates an internal switch and operates at 1.2MHz with PWM dimming capability, delivering up to 750mA output current. The part is actively produced and widely used in backlight applications requiring input voltage ranges from 2.7V to 5.5V with 26V output capability.

Substitute parts become necessary when the AP5725FDCG-7 reaches end-of-life status, inventory constraints occur, or application requirements demand alternative package configurations, output current ratings, or dimming control methods while maintaining functional equivalence in LED driver topology and performance characteristics.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP5725FDCG-7
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply (Min)	2.7V
Voltage Supply (Max)	5.5V
Voltage Output	26V
Current Output / Channel	750mA (Switch)
Frequency	1.2MHz
Dimming Control	PWM
Applications	Backlight
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	6-UDFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AP5725FDCG-7 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC regulator with internal switch
Number of Outputs: Single output configuration
Input Voltage Range: Minimum 2.7V supply capability
Output Voltage: 26V or higher capability
Dimming Method: PWM control compatibility
Current Rating: 750mA or greater switch current capacity
Applications: Backlight LED driver functionality
Operating Temperature: -40°C to 85°C minimum range
Compliance: ROHS3 and REACH requirements

Substitute parts may differ in package type (6-UDFN, 12-DSBGA, 9-DSBGA, SC-70 variants), switching frequency (500kHz to 4MHz), and specific output voltage ranges, provided they maintain the core boost topology and PWM dimming capability for backlight applications.

Parameter Comparison

Parameter	AP5725FDCG-7	LM3530TME-40/NOPB	LM3530TMX-40/NOPB	LM3642TLX-LT/NOPB	LT1937ESC6#TRMPBF	LT3491ESC8#TRMPBF
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1
Voltage Supply (Min)	2.7V	2.7V	2.7V	2.5V	2.5V	2.5V
Voltage Supply (Max)	5.5V	5.5V	5.5V	5.5V	10V	12V
Voltage Output	26V	40V	40V	5V	36V	Not Specified
Current Output / Channel	750mA (Switch)	30mA	30mA	1.5A (Flash)	320mA (Switch)	350mA (Switch)
Frequency	1.2MHz	500kHz	500kHz	4MHz	1.2MHz	2.3MHz
Dimming Control	PWM	PWM	PWM	I2C	Analog, PWM	PWM
Applications	Backlight	Backlight	Backlight	Camera Flash	Backlight	Backlight
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	6-UDFN Exposed Pad	12-WFBGA, DSBGA	12-WFBGA, DSBGA	9-WFBGA, DSBGA	6-TSSOP, SC-88, SOT-363	8-VFSOP
Product Status	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LM3530TME-40/NOPB and LM3530TMX-40/NOPB are direct functional equivalents for backlight applications. Both maintain identical electrical specifications with 2.7V to 5.5V input range, 40V output capability, and PWM dimming control. The primary difference is package configuration (12-DSBGA) versus the AP5725FDCG-7 (6-UDFN). Both parts are Active status with ROHS3 compliance and unlimited MSL rating. Current output is reduced to 30mA, suitable for lower-power backlight implementations.

LT1937ESC6#TRMPBF provides equivalent boost topology with PWM and analog dimming flexibility. Input range extends to 10V maximum, and output reaches 36V. Current capacity of 320mA supports moderate-power backlight circuits. Package is SC-70-6 (6-TSSOP variant). Active status with ROHS3 compliance and unlimited MSL rating.

LT3491ESC8#TRMPBF operates as a PWM-controlled boost regulator with 350mA switch current and 2.3MHz switching frequency. Input range extends to 12V maximum. SC-70-8 package (8-VFSOP) provides alternative form factor. Active status with ROHS3 compliance and unlimited MSL rating.

LM3642TLX-LT/NOPB differs in dimming control method (I2C instead of PWM) and primary application (camera flash). While topology is identical boost configuration with 1.5A flash current, this part is optimized for flash applications rather than continuous backlight operation. Active status with ROHS3 compliance.

All substitute parts maintain Active product status, ROHS3 compliance, and unlimited MSL ratings, ensuring long-term availability and environmental regulatory alignment with the original AP5725FDCG-7.

Frequently Asked Questions (FAQ)

Q: Can LM3530TME-40/NOPB directly replace AP5725FDCG-7 in existing PCB layouts?

A: Direct PCB replacement is not possible due to different package types. AP5725FDCG-7 uses 6-UDFN Exposed Pad, while LM3530TME-40/NOPB uses 12-DSBGA. PCB redesign and layout modification are required. However, electrical functionality is equivalent for backlight applications.

Q: What is the primary difference between LT1937ESC6#TRMPBF and LT3491ESC8#TRMPBF?

A: LT1937ESC6#TRMPBF supports both analog and PWM dimming control with 320mA switch current and 1.2MHz frequency. LT3491ESC8#TRMPBF supports PWM dimming only with 350mA switch current and 2.3MHz frequency. Both are boost regulators suitable for backlight applications. Package differs: SC-70-6 versus SC-70-8.

Q: Is LM3642TLX-LT/NOPB suitable as a substitute for backlight applications?

A: LM3642TLX-LT/NOPB is optimized for camera flash applications with I2C dimming control and 1.5A flash current capability. While it maintains boost topology and Active status, its primary design target is flash rather than continuous backlight operation. Electrical compatibility exists, but application requirements should be verified.

Q: What packaging options are available among substitute parts?

A: Substitute parts offer multiple package configurations: 6-UDFN (original), 12-DSBGA (LM3530 series), 9-DSBGA (LM3642), SC-70-6 (LT1937), and SC-70-8 (LT3491). Package selection depends on PCB space constraints, thermal requirements, and manufacturing capabilities. All are surface-mount configurations.

Q: Do all substitute parts meet the same compliance standards as AP5725FDCG-7?

A: All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the original AP5725FDCG-7 compliance profile. All carry unlimited MSL (Moisture Sensitivity Level) ratings, ensuring equivalent handling and storage requirements.

Q: What is the key limitation when substituting with lower current-rated parts?

A: LM3530TME-40/NOPB and LM3530TMX-40/NOPB provide only 30mA output current compared to AP5725FDCG-7's 750mA. These parts are suitable only for low-power backlight applications. Higher-current applications require LT1937ESC6#TRMPBF (320mA), LT3491ESC8#TRMPBF (350mA), or LM3642TLX-LT/NOPB (1.5A flash).

Q: Are there differences in switching frequency among substitute parts?

A: Switching frequencies vary: AP5725FDCG-7 operates at 1.2MHz, LM3530 series at 500kHz, LT1937 at 1.2MHz, LT3491 at 2.3MHz, and LM3642 at 4MHz. Higher frequencies reduce inductor and capacitor sizes but may increase EMI considerations. Application circuit design must account for frequency differences.

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