SP7685ER-L LED Driver IC Equivalent & Substitute Parts

Part Overview

The SP7685ER-L is a discontinued LED Driver IC manufactured by MaxLinear, Inc., designed for switched capacitor (charge pump) topology with 1.2A flash output capability. This part operates across a 2.7V to 5.5V supply range and is optimized for backlight and camera flash applications. Due to its discontinued status at DiGi Electronics, equivalent substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and legacy system support.

Key Parameters

Parameter	SP7685ER-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	1.2A (Flash)
Frequency	2.4MHz
Dimming	PWM
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 SP7685ER-L is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Switched Capacitor (Charge Pump) — maintains identical power conversion architecture
Supply Voltage Range: 2.7V to 5.5V — ensures compatibility with source power specifications
Output Current: Minimum 1.2A (Flash) — guarantees sufficient drive capability
Dimming Control: PWM or compatible control method — preserves application functionality
Operating Temperature: -40°C to 85°C minimum — maintains thermal operating envelope
Package Type: Surface mount with exposed pad — ensures PCB layout compatibility
RoHS Compliance: Required for regulatory adherence

Substitute Categories:

Category A — Direct Topology Match (Switched Capacitor): Parts maintaining identical charge pump topology with compatible electrical specifications. These provide the closest functional equivalence.

Category B — Alternative Topology (Step-Up/Boost): Parts using step-up (boost) topology with overlapping supply voltage and output current ranges. These offer functional alternatives for camera flash applications where topology flexibility exists.

Category C — Flexible Topology (Multi-Mode): Parts supporting multiple topologies including charge pump operation, providing design flexibility for various application requirements.

Parameter Comparison

Parameter	SP7685ER-L	LM2759SD/NOPB	MP3214DQ-LF-P	LM3565TLX/NOPB	MAX8607ETD+T	MIC2289-34YML-TR
Manufacturer	MaxLinear	Texas Instruments	Monolithic Power Systems	Texas Instruments	Analog Devices/Maxim	Microchip Technology
Topology	Switched Capacitor	Switched Capacitor	Switched Capacitor	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Voltage - Supply (Min)	2.7V	2.7V	2.7V	2.5V	2.7V	2.5V
Voltage - Supply (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	10V
Current - Output / Channel	1.2A (Flash)	1A (Flash)	500mA (Flash)	930mA (Flash)	1.5A (Flash)	750mA (Switch)
Frequency	2.4MHz	1MHz	1.35MHz	4MHz	1MHz	1.2MHz
Dimming	PWM	I2C	—	PWM	—	Analog, PWM
Operating Temperature	-40°C ~ 85°C	-30°C ~ 85°C	-40°C ~ 85°C	-30°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	10-VFDFN	12-WFDFN	16-VFQFN	16-WFBGA	14-WFDFN	8-VFDFN
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation — LM2759SD/NOPB (Texas Instruments)

This part maintains identical switched capacitor topology and supply voltage range (2.7V–5.5V) as the SP7685ER-L. Output current of 1A (Flash) meets the 1.2A requirement for most camera flash applications. Active product status ensures long-term availability. ROHS3 compliance and MSL 1 rating provide regulatory and manufacturing process compatibility. The 12-WSON package requires PCB layout adjustment from the original 10-DFN footprint.

Secondary Recommendation — MP3214DQ-LF-P (Monolithic Power Systems)

Maintains switched capacitor topology with 2.7V–5.5V supply compatibility. Output current of 500mA (Flash) is suitable for lower-power backlight applications but falls below the 1.2A specification for full-power flash operation. Active product status and ROHS3 compliance ensure availability. The 16-QFN package requires significant PCB redesign.

Alternative for Boost Topology Applications — LM3565TLX/NOPB (Texas Instruments)

Step-up (boost) topology with 2.5V–5.5V supply range and 930mA (Flash) output current. Suitable for camera flash applications where boost topology is acceptable. Active product status and ROHS3 compliance confirmed. Operating temperature range extends to -30°C minimum (versus -40°C). The 16-DSBGA package requires BGA assembly capability.

Extended Supply Voltage Option — MIC2289-34YML-TR (Microchip Technology)

Step-up (boost) topology with extended supply range (2.5V–10V) and 750mA (Switch) output current. Suitable for backlight applications with variable input voltage. Operating temperature range extends to -40°C to 125°C (TJ), providing superior thermal margin. ROHS3 compliance and MSL 1 rating confirmed. The 8-MLF package is the smallest footprint option.

High-Current Alternative — MAX8607ETD+T (Analog Devices/Maxim)

Step-up (boost) topology with 1.5A (Flash) output current, exceeding the SP7685ER-L specification. Supply range 2.7V–5.5V matches original part. Active product status and ROHS3 compliance confirmed. Operating temperature -40°C to 85°C matches original specification. The 14-TDFN package requires moderate PCB layout adjustment.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SP7685ER-L with LM2759SD/NOPB without PCB modifications?

A: No. While both parts use switched capacitor topology and share identical supply voltage specifications (2.7V–5.5V), the package differs: SP7685ER-L uses 10-VFDFN while LM2759SD/NOPB uses 12-WSON. PCB footprint redesign is required. Pin-to-pin compatibility must be verified against detailed datasheets before layout changes.

Q: Why do some substitute parts use boost topology instead of charge pump?

A: Boost topology provides functional equivalence for camera flash applications within the 2.7V–5.5V supply range. While topology differs, output current and dimming control capabilities meet application requirements. Boost converters offer advantages in certain designs, such as lower component count or improved efficiency at specific operating points.

Q: Is the MP3214DQ-LF-P suitable for full 1.2A flash applications?

A: No. MP3214DQ-LF-P provides 500mA (Flash) output current, which is 58% below the SP7685ER-L specification of 1.2A. This part is suitable only for reduced-power backlight applications or designs where flash current can be limited to 500mA.

Q: What is the impact of different operating temperature ranges?

A: The SP7685ER-L operates from -40°C to 85°C (TA). Substitute parts like LM3565TLX/NOPB and LM2759SD/NOPB have minimum operating temperatures of -30°C, reducing cold-temperature margin by 10°C. For applications requiring full -40°C operation, verify substitute part performance at this temperature or select alternatives with matching -40°C minimum (MAX8607ETD+T, MP3214DQ-LF-P, MIC2289-34YML-TR).

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification, matching or exceeding the RoHS Compliant status of the SP7685ER-L. All parts are suitable for applications requiring RoHS adherence.

Q: What package considerations apply when selecting a substitute?

A: The SP7685ER-L uses 10-VFDFN (3x3mm). Substitute parts use various packages: 12-WSON, 16-QFN, 16-DSBGA, 14-TDFN, and 8-MLF. Each requires different PCB footprint, via placement, and thermal management approaches. DSBGA packages require BGA assembly capability. Smaller packages (8-MLF) reduce board area but may increase thermal density. Verify manufacturing capability before package selection.

Q: Can I use HV9918K7-G as a substitute despite different topology?

A: HV9918K7-G uses step-down (buck) topology with 4.5V–40V supply range, which does not overlap the SP7685ER-L's 2.7V minimum requirement. This part is not suitable for direct substitution in designs requiring low-voltage operation below 4.5V.

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

A: SP7685ER-L and most substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling. LM2759SD/NOPB carries MSL 3 (168 Hours), requiring controlled humidity storage and limiting shelf life to 168 hours after moisture exposure. For high-volume production with extended storage, MSL 1 parts are preferred.

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