SC4620MLTRT Equivalent & Substitute Parts

Part Overview

The SC4620MLTRT is a buck switching regulator IC manufactured by Semtech Corporation, designed for positive adjustable output applications with 2.5A output current capability in a 20-VFQFN exposed pad package. This device operates across an input voltage range of 2.3V to 5.5V with adjustable output from 0.5V to 5.5V and a switching frequency range of 200kHz to 2MHz. The product is currently obsolete, making equivalent substitute parts necessary for new designs or production continuity.

Substiute Parts

SC4620MLTRT

Semtech CorporationIn Stock: 718SC4620MLTRT Datasheet

Current PartRFQ

LTC3310SIV#PBF

Analog Devices Inc.In Stock: 4224LTC3310SIV#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SC4620MLTRT are qualified based on the following critical parameters:

• Topology & Function: Buck switching regulator with step-down configuration
• Output Configuration: Positive adjustable output
• Voltage Specifications: Input range 2.3V to 5.5V minimum, output adjustable from 0.5V to 5.5V
• Output Current Capability: Minimum 2.5A required
• Synchronous Rectification: Must include integrated synchronous rectifier
• Switching Frequency: Operational range must encompass or exceed the original 200kHz to 2MHz specification
• Package Compatibility: Surface mount with exposed pad design
• Compliance: RoHS compliance required

The LTC3310SIV#PBF from Analog Devices Inc. meets these substitution criteria with enhanced specifications in output current (10A), operating temperature range (-40°C to 125°C), and switching frequency (2MHz fixed), while maintaining compatibility with the core functional requirements.

Parameter Comparison

Engineering Selection Recommendations

The LTC3310SIV#PBF is the qualified substitute for the obsolete SC4620MLTRT based on functional equivalence and enhanced specifications. Key selection factors include:

• Product Status: The LTC3310SIV#PBF is an active product with ongoing manufacturer support, whereas the SC4620MLTRT is obsolete and subject to availability constraints.
• Compliance: Both devices meet RoHS requirements. The LTC3310SIV#PBF carries ROHS3 compliance, representing current regulatory standards.
• Performance Margin: The LTC3310SIV#PBF provides 4x output current capability (10A vs. 2.5A), enabling designs with greater power delivery headroom.
• Temperature Range: Extended operating temperature range (-40°C to 125°C junction temperature) provides improved thermal performance margin.
• Package Transition: The shift from 20-VFQFN to 18-TFQFN requires PCB layout modification but maintains exposed pad thermal management and surface mount compatibility.

Frequently Asked Questions (FAQ)

Q: Can the LTC3310SIV#PBF directly replace the SC4620MLTRT without design changes?

A: Functional substitution is possible due to matching topology, output configuration, and voltage specifications. However, package geometry differs (20-VFQFN vs. 18-TFQFN), requiring PCB footprint redesign. Pin-to-pin compatibility must be verified against detailed datasheets before implementation.

Q: What are the key compatibility criteria for substitution?

A: Substitution is valid when the replacement device maintains buck topology, positive adjustable output configuration, input voltage range of 2.3V to 5.5V minimum, output adjustable from 0.5V to 5.5V, output current capability of at least 2.5A, integrated synchronous rectification, and surface mount exposed pad packaging.

Q: Does the higher output current rating of the LTC3310SIV#PBF affect circuit design?

A: The 10A output current rating of the LTC3310SIV#PBF is a performance enhancement that does not negatively impact designs originally specified for 2.5A. Thermal management and PCB current distribution should be evaluated based on actual application current requirements.

Q: Are there compliance or certification differences between these devices?

A: Both devices are RoHS compliant. The LTC3310SIV#PBF carries ROHS3 certification, reflecting current regulatory standards. Both devices are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: What is the impact of the fixed 2MHz switching frequency in the LTC3310SIV#PBF versus the variable 200kHz to 2MHz range in the SC4620MLTRT?

A: The LTC3310SIV#PBF operates at a fixed 2MHz switching frequency. Applications requiring lower switching frequencies must evaluate whether this fixed frequency meets EMI, efficiency, and component selection requirements.