LTC3829IFE#WPBF Equivalent & Substitute Parts

Part Overview

The LTC3829IFE#WPBF is a 3-phase synchronous buck DC-DC controller manufactured by Analog Devices Inc. within the PolyPhase® series. This active product functions as a step-down regulator with positive output configuration, designed for applications requiring multi-phase power delivery with integrated transistor driver output. The device operates across a wide input voltage range of 4.5V to 38V with switching frequencies between 250kHz and 770kHz, incorporating advanced control features including current limiting, frequency control, power good monitoring, soft start, and output tracking.

Equivalent and substitute parts are identified to address inventory availability, design flexibility, and application-specific requirements while maintaining electrical and mechanical compatibility within the buck regulator controller category.

Key Parameters

Parameter	Value
Manufacturer	Analog Devices Inc.
Category	Power Management (PMIC)
Function	Step-Down Buck Regulator Controller
Output Type	Transistor Driver
Output Configuration	Positive
Voltage Supply Range (Vcc/Vdd)	4.5V ~ 38V
Switching Frequency Range	250kHz ~ 770kHz
Maximum Duty Cycle	94% - 95%
Synchronous Rectifier	Yes
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package Type	38-TFSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LTC3829IFE#WPBF are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Matching Parameters:

Topology: Buck (step-down)
Output Type: Transistor Driver
Output Configuration: Positive
Package: 38-TFSOP with Exposed Pad
Voltage Supply Range: 4.5V ~ 38V
Switching Frequency Range: 250kHz ~ 770kHz
Synchronous Rectifier: Yes
Operating Temperature: -40°C ~ 125°C
Compliance: ROHS3, MSL 1, REACH Unaffected

Substitution Categories:

Category 1 - Direct Parametric Equivalents (3-Phase Output): Parts with identical output phase configuration (3 phases) and all critical electrical parameters matching the main part. These include LTC3829EFE#PBF and LTC3829IFE#PBF, differing only in temperature grade designation within the same base product number.

Category 2 - Functional Equivalents (2-Phase Output): Parts with 2-phase output configuration instead of 3-phase, including LTC3855IFE#PBF, LTC3856EFE#PBF, LTC3865EFE#PBF, and LTC3865IFE#PBF. These maintain all core electrical specifications but operate with reduced phase count, suitable for applications where phase reduction is acceptable or beneficial.

Parameter Comparison

Part Number	Manufacturer	Base Product	Output Phases	Vcc/Vdd Range	Switching Frequency	Max Duty Cycle	Sync Rectifier	Temp Range	Package	Inventory (Pcs)
LTC3829IFE#WPBF	Analog Devices Inc.	LTC3829	3	4.5V ~ 38V	250kHz ~ 770kHz	94%	Yes	-40°C ~ 125°C	38-TFSOP-EP	1200
LTC3829EFE#PBF	Analog Devices Inc.	LTC3829	3	4.5V ~ 38V	250kHz ~ 770kHz	94%	Yes	-40°C ~ 125°C	38-TFSOP-EP	1083
LTC3829IFE#PBF	Analog Devices Inc.	LTC3829	3	4.5V ~ 38V	250kHz ~ 770kHz	94%	Yes	-40°C ~ 125°C	38-TFSOP-EP	804
LTC3855IFE#PBF	Analog Devices Inc.	LTC3855	2	4.5V ~ 38V	250kHz ~ 770kHz	95%	Yes	-40°C ~ 125°C	38-TFSOP-EP	876
LTC3856EFE#PBF	Analog Devices Inc.	LTC3856	2	4.5V ~ 38V	250kHz ~ 770kHz	94%	Yes	-40°C ~ 125°C	38-TFSOP-EP	947
LTC3865EFE#PBF	Analog Devices Inc.	LTC3865	2	4.5V ~ 38V	250kHz ~ 770kHz	95%	Yes	-40°C ~ 125°C	38-TFSOP-EP	2298
LTC3865IFE#PBF	Analog Devices Inc.	LTC3865	2	4.5V ~ 38V	250kHz ~ 770kHz	95%	Yes	-40°C ~ 125°C	38-TFSOP-EP	2528

Engineering Selection Recommendations

For Direct Replacement (3-Phase Applications):

LTC3829EFE#PBF and LTC3829IFE#PBF are direct parametric equivalents to LTC3829IFE#WPBF. Both maintain identical electrical specifications and 3-phase output configuration. Selection between these variants depends on temperature grade requirements and inventory availability. All three variants are Active products with ROHS3 compliance and MSL 1 rating, ensuring equivalent regulatory and environmental performance.

For Phase-Reduced Designs (2-Phase Applications):

LTC3855IFE#PBF, LTC3856EFE#PBF, LTC3865EFE#PBF, and LTC3865IFE#PBF operate with 2-phase output instead of 3-phase. These parts maintain all core electrical parameters including voltage supply range, switching frequency capability, and synchronous rectification. The 2-phase configuration results in slightly higher maximum duty cycle (95% versus 94%) in LTC3855IFE#PBF, LTC3865EFE#PBF, and LTC3865IFE#PBF. All substitute parts are Active products with identical compliance certifications (ROHS3, MSL 1, REACH Unaffected).

Inventory Considerations:

LTC3865IFE#PBF and LTC3865EFE#PBF offer the highest inventory availability (2528 and 2298 units respectively), providing supply chain flexibility for 2-phase applications. LTC3829IFE#PBF maintains 804 units for 3-phase requirements.

Frequently Asked Questions (FAQ)

Q: Can LTC3829IFE#WPBF be replaced with a 2-phase controller like LTC3865IFE#PBF?

A: Substitution is possible if the application design accommodates 2-phase operation instead of 3-phase. The electrical specifications (voltage range, switching frequency, duty cycle, synchronous rectification) are compatible. Circuit topology and PCB layout modifications may be required to implement 2-phase interleaving instead of 3-phase.

Q: What is the difference between LTC3829IFE#WPBF, LTC3829EFE#PBF, and LTC3829IFE#PBF?

A: All three parts share identical electrical specifications and 3-phase output configuration. The suffix designations (WPBF, EFE#PBF, IFE#PBF) indicate different temperature grade and packaging variants within the LTC3829 base product family. Selection depends on specific temperature operating requirements and packaging preferences.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use the 38-TFSOP package with exposed pad (0.173" width, 4.40mm). This ensures mechanical compatibility and identical PCB footprint for direct board-level substitution where electrical specifications align.

Q: Do all substitute parts support the same control features?

A: All substitute parts support current limit, enable, frequency control, power good, soft start, and tracking features. LTC3855IFE#PBF, LTC3856EFE#PBF, LTC3865EFE#PBF, and LTC3865IFE#PBF additionally include phase control capability, which is not listed for the 3-phase LTC3829 variants.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and are REACH Unaffected. These certifications ensure equivalent environmental and regulatory compliance across all listed alternatives.

Q: Can LTC3829IFE#WPBF be used in applications designed for LTC3855IFE#PBF?

A: Direct substitution is not recommended without design review. While both parts share the same package, voltage range, and switching frequency capability, the LTC3829IFE#WPBF operates with 3-phase output versus 2-phase for LTC3855IFE#PBF. Circuit topology, gate driver connections, and interleaving logic differ between these configurations.

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