CS1680-FZZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The CS1680-FZZ is an LED Driver IC manufactured by Cirrus Logic Inc., designed for offline AC/DC switching applications with triac dimming capability. This component operates as a step-down (buck) and step-up (boost) converter in the 11V to 17V supply range, delivering 15V output at 1.3kHz to 3.3kHz switching frequency.

The CS1680-FZZ is classified as obsolete. Identifying equivalent and substitute parts is essential for design continuity, production planning, and long-term product support where original components are no longer available from primary sources.

Key Parameters

Parameter	CS1680-FZZ
Manufacturer	Cirrus Logic Inc.
Category	Power Management (PMIC)
Type	AC DC Offline Switcher
Topology	Step-Down (Buck), Step-Up (Boost)
Dimming	Triac
Voltage - Supply (Min)	11V
Voltage - Supply (Max)	17V
Voltage - Output	15V
Frequency	1.3kHz ~ 3.3kHz
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the CS1680-FZZ is determined by the following critical parameters:

AC/DC Offline Switcher Type: All substitute parts must function as offline AC/DC switcher ICs for LED driver applications
Triac Dimming Capability: Triac dimming is a mandatory functional requirement for direct substitution
Supply Voltage Range: Substitute parts must accommodate the 11V to 17V input range or provide compatible operating conditions
Output Configuration: Single output LED driver topology
Switching Frequency: Operating frequency range must be compatible with existing circuit design
Package Compatibility: Surface mount packages with pin-compatible or functionally equivalent layouts
Operating Temperature Range: Must support -40°C to 125°C minimum junction temperature range
Product Status & Compliance: Active or available product status with current RoHS compliance preferred for new designs

The substitute parts identified below meet these criteria through equivalent functional specifications and compatible electrical parameters.

Parameter Comparison

Parameter	CS1680-FZZ	LNK409EG	LT3799EMSE-1#TRPBF	MP4000DS-LF	MP4088GJ-Z	TPS92001DR
Manufacturer	Cirrus Logic Inc.	Power Integrations	Analog Devices Inc.	Monolithic Power Systems Inc.	Monolithic Power Systems Inc.	Texas Instruments
Type	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher	AC DC Offline Switcher
Topology	Step-Down (Buck), Step-Up (Boost)	Flyback	Flyback	Step-Down (Buck)	Buck, Boost	Flyback, Step-Down (Buck)
Dimming	Triac	Triac	Triac	Analog, PWM	Triac	Triac
Voltage - Supply (Min)	11V	36V	-	8V	4.5V	-
Voltage - Supply (Max)	17V	725V	-	10.5V	5V	21V
Voltage - Output	15V	-	-	-	-	5V
Frequency	1.3kHz ~ 3.3kHz	66kHz	25kHz ~ 300kHz	110kHz	22kHz	100kHz
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 105°C (TJ)
Mounting Type	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-TSSOP	7-SSIP, 6 Leads, Exposed Pad, Formed Leads	16-TFSOP Exposed Pad	8-SOIC	SOT-23-5	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Last Time Buy
RoHS Status	-	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LNK409EG (Power Integrations): Active product status with RoHS compliance and unlimited MSL. Supports triac dimming and operates across a wide supply voltage range (36V to 725V). Topology is flyback rather than buck/boost. Through-hole package requires PCB layout modification. Suitable for new designs requiring long-term component availability.

LT3799EMSE-1#TRPBF (Analog Devices Inc.): Active product with ROHS3 compliance and unlimited MSL. Surface mount 16-TFSOP package maintains similar form factor to original. Supports triac dimming with adjustable frequency range (25kHz to 300kHz). Flyback topology. Recommended for designs prioritizing package compatibility and long-term support.

MP4000DS-LF (Monolithic Power Systems Inc.): Active product with ROHS3 compliance. Step-down (buck) topology matches original. Supports analog and PWM dimming rather than triac-only. Supply voltage range (8V to 10.5V) overlaps with original specification. 8-SOIC package requires layout modification. Automotive-grade component. Suitable for applications where PWM dimming is acceptable.

MP4088GJ-Z (Monolithic Power Systems Inc.): Active product with ROHS3 compliance and unlimited MSL. Buck/boost topology matches original functionality. Supports triac dimming. Supply voltage range (4.5V to 5V) is narrower than original. SOT-23-5 package is significantly smaller, requiring PCB redesign. Suitable for space-constrained applications.

TPS92001DR (Texas Instruments): Last Time Buy status with ROHS3 compliance and unlimited MSL. Supports triac dimming with flyback and buck topologies. Supply voltage maximum (21V) accommodates original range. 8-SOIC package requires layout modification. Limited future availability due to product status.

Frequently Asked Questions (FAQ)

Q: Can the LNK409EG directly replace the CS1680-FZZ without circuit modification?

A: No. The LNK409EG uses through-hole mounting (7-SSIP package) versus the original surface mount 16-TSSOP package. PCB layout and footprint redesign is required. Additionally, the flyback topology differs from the original buck/boost topology, requiring circuit topology evaluation.

Q: Which substitute part maintains the closest package compatibility?

A: The LT3799EMSE-1#TRPBF offers the closest package compatibility with a 16-pin surface mount configuration (16-TFSOP) similar to the original 16-TSSOP. This minimizes PCB layout modifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts carry RoHS or ROHS3 compliance status. The original CS1680-FZZ does not specify RoHS status.

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

A: The original CS1680-FZZ has MSL 3 (168-hour limit), requiring controlled storage conditions. All substitute parts have MSL 1 or 2, providing superior moisture tolerance and longer shelf life without special handling.

Q: Can the MP4000DS-LF substitute if the application uses PWM dimming instead of triac dimming?

A: Yes. The MP4000DS-LF supports both analog and PWM dimming modes. However, if the original design specifically requires triac dimming, this part requires circuit and firmware modification to implement PWM dimming control.

Q: Which substitute part has the longest guaranteed product availability?

A: The LT3799EMSE-1#TRPBF and MP4088GJ-Z both carry Active product status with unlimited MSL, indicating ongoing manufacturing and support. The TPS92001DR is Last Time Buy, indicating limited future availability.

Q: Does supply voltage range affect substitution suitability?

A: Yes. The original CS1680-FZZ operates at 11V to 17V. Substitute parts with narrower ranges (such as MP4088GJ-Z at 4.5V to 5V) require circuit redesign to accommodate different input voltage specifications. Parts with wider ranges (such as LNK409EG at 36V to 725V) may require additional design considerations for the original 11V to 17V application.

Q: What is the impact of switching frequency differences?

A: The original operates at 1.3kHz to 3.3kHz. Substitute parts operate at significantly higher frequencies (22kHz to 300kHz). Higher switching frequencies reduce component size but may require filter and EMI design adjustments. Circuit simulation and testing are necessary to confirm compatibility.

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