SP6685ER-L LED Driver IC Equivalent & Substitute Parts

Part Overview

The SP6685ER-L is a switched capacitor LED driver IC manufactured by MaxLinear, Inc., designed for high-current flash applications in backlight and camera flash systems. This part operates with a 700mA flash output capability and features integrated switching at 2.4MHz, supporting input voltages from 2.7V to 5.5V. The SP6685ER-L is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	SP6685ER-L
Manufacturer	MaxLinear, Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Switched Capacitor (Charge Pump)
Number of Outputs	1
Voltage - Supply (Min)	2.7V
Voltage - Supply (Max)	5.5V
Current - Output / Channel	700mA (Flash)
Frequency	2.4MHz
Applications	Backlight, Camera Flash
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	10-VFDFN Exposed Pad
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the SP6685ER-L is determined by the following critical parameters:

Topology: Switched Capacitor (Charge Pump) topology is the primary substitution criterion, as it directly impacts circuit design and external component requirements.
Supply Voltage Range: Input voltage compatibility (2.7V to 5.5V) must be maintained or exceeded.
Output Current Capability: Flash output current of 700mA or higher ensures functional equivalence for high-current flash applications.
Frequency: Operating frequency near 2.4MHz minimizes design changes to external filtering and timing components.
Applications: Backlight and camera flash applications define the intended use case.
Package Compatibility: Surface mount packages with similar form factors reduce PCB redesign requirements.
Product Status & Compliance: Active product status with RoHS compliance ensures long-term availability and regulatory alignment.

Substitute parts are grouped based on topology alignment and electrical parameter compatibility. Parts with identical or superior electrical specifications within the defined supply voltage and current ranges are considered direct substitutes.

Parameter Comparison

Parameter	SP6685ER-L	MP3214DQ-LF-Z	LT3591EDDB#TRPBF	MPQ4425MGQB-AEC1-Z	RT8476GS
Manufacturer	MaxLinear, Inc.	Monolithic Power Systems Inc.	Analog Devices Inc.	Monolithic Power Systems Inc.	Richtek USA Inc.
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Switched Capacitor (Charge Pump)	Switched Capacitor (Charge Pump)	Step-Up (Boost)	Step-Down (Buck)	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1	1	1	1	1
Voltage - Supply (Min)	2.7V	2.7V	2.5V	4V	4.5V
Voltage - Supply (Max)	5.5V	5.5V	12V	36V	40V
Current - Output / Channel	700mA (Flash)	500mA (Flash)	500mA (Switch)	1.5A	Not Specified
Frequency	2.4MHz	1.35MHz	1MHz	2.2MHz	Not Specified
Applications	Backlight, Camera Flash	Backlight, Camera Flash	Backlight	Lighting	Lighting, Signage
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Package / Case	10-VFDFN Exposed Pad	16-VFQFN Exposed Pad	8-WFDFN Exposed Pad	13-PowerVQFN	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Obsolete

Engineering Selection Recommendations

MP3214DQ-LF-Z is the primary substitute for SP6685ER-L applications. Both parts employ switched capacitor (charge pump) topology with identical supply voltage range (2.7V to 5.5V) and support backlight and camera flash applications. The MP3214DQ-LF-Z delivers 500mA flash output, which is lower than the SP6685ER-L's 700mA capability but maintains functional compatibility for most backlight and moderate flash applications. The part is active with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and manufacturing compatibility.

LT3591EDDB#TRPBF is suitable for backlight-only applications where boost topology is acceptable. This part operates across a wider supply voltage range (2.5V to 12V) and provides 500mA switch output. The step-up (boost) topology differs from the charge pump approach, requiring circuit redesign. This part is active with ROHS3 compliance and MSL 1 rating.

MPQ4425MGQB-AEC1-Z is applicable for lighting applications requiring higher current capability (1.5A) and extended supply voltage range (4V to 36V). The step-down (buck) topology differs fundamentally from the charge pump topology, necessitating significant circuit redesign. This part includes automotive qualification (AEC-Q100) and operates across an extended temperature range (-40°C to 125°C), making it suitable for automotive lighting applications. Product status is active with ROHS3 compliance and MSL 1 rating.

RT8476GS is not recommended for new designs. Although it supports both buck and boost topologies with a wide supply voltage range (4.5V to 40V), the part is obsolete with MSL 3 rating (168 hours), limiting manufacturing window and long-term availability. The internal switch specification is "No," indicating external switching requirements that differ from the SP6685ER-L architecture.

Frequently Asked Questions (FAQ)

Q: Can MP3214DQ-LF-Z directly replace SP6685ER-L in existing designs?

A: MP3214DQ-LF-Z is functionally compatible for most applications due to identical switched capacitor topology and supply voltage range (2.7V to 5.5V). However, the output current is reduced from 700mA to 500mA. Designs operating at or near the 700mA limit require current capability reassessment. The package changes from 10-DFN to 16-QFN, requiring PCB layout modification.

Q: Why does LT3591EDDB#TRPBF have a different topology?

A: LT3591EDDB#TRPBF uses step-up (boost) topology instead of switched capacitor (charge pump). Boost topology is suitable for backlight applications where output voltage exceeds input voltage. This topology requires different external component values and circuit design compared to charge pump implementations. Use this part only if boost topology is acceptable for your application.

Q: Is MPQ4425MGQB-AEC1-Z suitable for consumer backlight applications?

A: MPQ4425MGQB-AEC1-Z is designed for lighting applications with automotive qualification (AEC-Q100). While it provides higher current capability (1.5A) and extended temperature range (-40°C to 125°C), the step-down (buck) topology differs from SP6685ER-L's charge pump topology. This part is suitable for consumer applications but requires circuit redesign to accommodate buck topology.

Q: What is the impact of package changes when substituting parts?

A: Package changes require PCB layout redesign. SP6685ER-L uses 10-DFN (3x3), while MP3214DQ-LF-Z uses 16-QFN (3x3). Although both are 3x3mm packages, the pin count and pinout differ, necessitating schematic and layout modifications. LT3591EDDB#TRPBF uses 8-DFN (3x2), a smaller package requiring significant layout changes.

Q: Why is RT8476GS not recommended despite supporting multiple topologies?

A: RT8476GS is obsolete with MSL 3 rating (168 hours), limiting the manufacturing window for new production. Obsolete parts present supply chain risk and long-term availability concerns. Additionally, the internal switch specification is "No," indicating external switching architecture that differs from SP6685ER-L's integrated switch design.

Q: What compliance certifications should I verify for substitute parts?

A: All recommended active substitute parts (MP3214DQ-LF-Z, LT3591EDDB#TRPBF, MPQ4425MGQB-AEC1-Z) carry ROHS3 compliance and MSL 1 rating, matching or exceeding SP6685ER-L's RoHS compliance. MPQ4425MGQB-AEC1-Z includes automotive qualification (AEC-Q100) for applications requiring automotive-grade components.

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