MP4689DN-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4689DN-LF-Z is a Power Management IC (PMIC) manufactured by Monolithic Power Systems Inc., classified as an LED Driver Regulator with PWM dimming capability. This device functions as a Step-Down (Buck) DC-DC regulator with 1A output current capacity, designed for lighting applications. The part carries a "Not For New Designs" status, making identification of active equivalent and substitute components essential for ongoing production support and design continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP4689DN-LF-Z
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	95V
Current - Output / Channel	1A
Frequency	1MHz
Dimming	PWM
Applications	Lighting
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type	Surface Mount
Product Status	Not For New Designs
RoHS Status	ROHS3 Compliant
Grade	Automotive

Substitute Part Grouping Explanation

Substitution eligibility for the MP4689DN-LF-Z is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Down (Buck) DC-DC Regulator
Output Current: 1A minimum capability
Supply Voltage Range: Minimum 4.5V, Maximum ≥65V
Dimming Method: PWM support
Operating Temperature: -40°C to 125°C (TJ)
Applications: Lighting
Internal Switch: Yes (integrated)
Number of Outputs: 1

Secondary Compatibility Factors:

RoHS3 Compliance
Automotive Grade (preferred for equivalent functionality)
Surface Mount packaging

Substitute parts are grouped into two categories based on topology alignment and electrical parameter compatibility:

Category A - Direct Buck Topology Substitutes (Highest Compatibility): Parts maintaining Step-Down (Buck) topology with 1A output current and extended supply voltage range (≥65V), supporting PWM dimming for lighting applications.

Category B - Alternative Topology Substitutes (Functional Equivalents): Parts with different topologies (Switched Capacitor, Step-Up) or reduced current ratings that may serve specific application requirements but require design verification for parameter compatibility.

Parameter Comparison

Parameter	MP4689DN-LF-Z	LM3402HVMMX/NOPB	LM3414HVSD/NOPB	TPS92512DGQT	TPS92511DDAR	LM3405AXMKE/NOPB	PAM2804AAB010
Manufacturer	MPS	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Diodes Inc.
Topology	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)
Voltage - Supply (Min)	4.5V	6V	4.5V	4.5V	4.5V	3V	2.5V
Voltage - Supply (Max)	95V	75V	65V	42V	65V	22V	6V
Current - Output / Channel	1A	500mA	1A	2.5A (Switch)	500mA	1A	1A
Frequency	1MHz	1MHz	500kHz	2MHz	500kHz	1.6MHz	1.5MHz
Dimming	PWM	PWM	Analog, PWM	PWM	Analog, PWM	PWM	-
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC Exposed Pad	8-VSSOP	8-WSON (3x3)	10-HVSSOP	8-SO PowerPad	TSOT-23-6	TSOT-23-5
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Automotive	-	Automotive	-	-	-	-

Engineering Selection Recommendations

Tier 1 - Highest Compatibility Substitutes (Active Status, Extended Supply Range):

LM3402HVMMX/NOPB and LM3414HVSD/NOPB represent the closest functional equivalents. Both maintain Step-Down (Buck) topology, support PWM dimming for lighting applications, operate across -40°C to 125°C, and carry ROHS3 compliance. LM3414HVSD/NOPB additionally provides Automotive Grade certification matching the original part specification. Supply voltage range extends to 65-75V, accommodating the MP4689DN-LF-Z's 95V maximum requirement within acceptable design margins for most lighting applications.

Tier 2 - Compatible Substitutes (Active Status, Reduced Supply Range):

TPS92512DGQT and TPS92511DDAR are Active status parts with Step-Down (Buck) topology and PWM dimming support. TPS92512DGQT provides higher output current (2.5A switch current) but operates to 42V maximum supply. TPS92511DDAR maintains 500mA output with 65V maximum supply. Both support the full -40°C to 125°C operating temperature range and ROHS3 compliance.

Tier 3 - Functional Alternatives (Active Status, Design Verification Required):

LM3405AXMKE/NOPB operates with reduced supply voltage range (3V to 22V) and 1A output current, suitable for lower voltage lighting applications. PAM2804AAB010 provides 1A output but operates only to 6V maximum supply and lacks specified PWM dimming capability, limiting applicability to specific low-voltage designs.

Compliance and Certification: All recommended substitutes maintain ROHS3 compliance. Automotive Grade certification is available with LM3414HVSD/NOPB for applications requiring automotive-qualified components.

Frequently Asked Questions (FAQ)

Q: Can LM3402HVMMX/NOPB directly replace MP4689DN-LF-Z in existing designs?

A: LM3402HVMMX/NOPB is functionally compatible as a Step-Down (Buck) LED driver with PWM dimming, 1MHz frequency, and -40°C to 125°C operation. However, output current is rated at 500mA versus the original 1A specification. Package differs (8-VSSOP vs. 8-SOIC), requiring PCB layout modification. Design verification is necessary to confirm current requirements and thermal performance.

Q: What is the primary limitation of PAM2804AAB010 as a substitute?

A: PAM2804AAB010 operates with maximum supply voltage of 6V, significantly below the MP4689DN-LF-Z's 95V specification. This part is suitable only for low-voltage lighting applications. Additionally, dimming capability is not specified, limiting its use in PWM-controlled lighting designs.

Q: Why does LM3414HVSD/NOPB carry Automotive Grade certification while others do not?

A: LM3414HVSD/NOPB is specifically qualified for automotive applications, meeting additional reliability and environmental testing requirements. The original MP4689DN-LF-Z also carries Automotive Grade certification. For automotive lighting applications, LM3414HVSD/NOPB is the preferred substitute.

Q: How does package difference affect substitution feasibility?

A: The MP4689DN-LF-Z uses 8-SOIC (0.154", 3.90mm Width) Exposed Pad packaging. Substitute parts employ different packages: LM3402HVMMX/NOPB (8-VSSOP), LM3414HVSD/NOPB (8-WSON 3x3), TPS92512DGQT (10-HVSSOP), and LM3405AXMKE/NOPB (TSOT-23-6). PCB layout redesign is required for any package change. Pin configuration and thermal pad placement must be verified against schematic requirements.

Q: Is TPS92512DGQT suitable for applications requiring 1A output current?

A: TPS92512DGQT provides 2.5A switch current capability, exceeding the 1A requirement. However, maximum supply voltage is limited to 42V, below the original 95V specification. This part is suitable for lighting applications operating within 4.5V to 42V supply range.

Q: What thermal considerations apply when substituting with different packages?

A: Package thermal characteristics vary significantly. The original 8-SOIC Exposed Pad and substitute packages (8-WSON, 8-VSSOP, 10-HVSSOP) have different thermal resistance values. Thermal analysis is required to confirm adequate heat dissipation at 1A output current, particularly for extended temperature operation (-40°C to 125°C).

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all recommended substitute parts carry ROHS3 Compliant certification, matching the original MP4689DN-LF-Z specification.

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