UCC3585M Equivalent & Substitute Parts

Part Overview

The UCC3585M is a buck regulator positive output step-down DC-DC controller IC manufactured by Texas Instruments in a 16-SSOP package. This device functions as a transistor driver for step-down topology applications with a single output phase. The UCC3585M is classified as obsolete, making identification of suitable substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in buck regulation topology while accommodating differences in packaging, operating parameters, and control features.

Substiute Parts

UCC3585M

Texas InstrumentsIn Stock: 2022UCC3585M Datasheet

Current PartRFQ

LM2745MTC/NOPB

Texas InstrumentsIn Stock: 24558LM2745MTC/NOPB Datasheet

MFR RecommendedRFQ

TPS53119RGTR

Texas InstrumentsIn Stock: 5990TPS53119RGTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UCC3585M are selected based on functional equivalence in buck regulator topology and compatibility across the following critical parameters:

• Output Type: Transistor Driver
• Function: Step-Down DC-DC Controller
• Topology: Buck
• Number of Outputs: 1
• Output Phases: 1
• Synchronous Rectifier: Yes
• RoHS Compliance: ROHS3 Compliant

The two identified substitute parts—LM2745MTC/NOPB and TPS53119RGTR—maintain these core functional characteristics. Variations in supply voltage range, switching frequency, duty cycle maximum, package type, operating temperature range, and control features are documented in the parameter comparison table below. These variations must be evaluated against specific application requirements during component selection.

Parameter Comparison

Engineering Selection Recommendations

Both LM2745MTC/NOPB and TPS53119RGTR are active products from Texas Instruments and represent viable substitutes for the obsolete UCC3585M. Selection between these alternatives depends on application-specific requirements:

LM2745MTC/NOPB offers the closest supply voltage compatibility (3V ~ 6V) to the original UCC3585M (3V ~ 5.5V) and provides an extended operating temperature range (-40°C ~ 125°C). This part includes additional control features such as Power Good, Tracking, and Clock Sync capability. The 14-TSSOP package differs from the original 16-SSOP, requiring PCB layout modification. Moisture sensitivity is rated at MSL 1 (Unlimited), providing superior handling characteristics.

TPS53119RGTR supports a wider supply voltage range (4.5V ~ 25V), accommodating applications requiring higher input voltages. The 16-VQFN package provides a smaller footprint compared to the original 16-SSOP. Operating temperature range is -20°C ~ 85°C. This part includes D-CAP+™ and Eco-Mode™ series features. Moisture sensitivity is rated at MSL 2 (1 Year), matching the original specification.

Both substitute parts maintain ROHS3 compliance and are manufactured by Texas Instruments, ensuring regulatory alignment and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LM2745MTC/NOPB directly replace UCC3585M without PCB modifications?

A: No. The LM2745MTC/NOPB uses a 14-TSSOP package versus the UCC3585M's 16-SSOP package. Pin count and pinout differ, requiring schematic and PCB redesign. Verify pin assignments and control feature compatibility before implementation.

Q: What is the primary difference between the two substitute options?

A: LM2745MTC/NOPB operates within 3V ~ 6V supply range with extended temperature capability (-40°C ~ 125°C) and includes Clock Sync and Power Good features. TPS53119RGTR supports 4.5V ~ 25V supply range with a smaller 16-VQFN package footprint. Select based on input voltage requirements and available PCB space.

Q: Are both substitutes suitable for low-voltage applications below 4.5V?

A: LM2745MTC/NOPB supports operation down to 3V and is suitable for low-voltage applications. TPS53119RGTR requires minimum 4.5V supply and is not suitable for applications below this threshold.

Q: How do duty cycle differences affect substitution?

A: UCC3585M supports 100% maximum duty cycle, while LM2745MTC/NOPB is limited to 86% and TPS53119RGTR to 90%. Applications requiring 100% duty cycle operation cannot use these substitutes without circuit topology modification.

Q: What packaging considerations apply to these substitutes?

A: UCC3585M uses 16-SSOP (0.154" width). LM2745MTC/NOPB uses 14-TSSOP (0.173" width), requiring different PCB footprint. TPS53119RGTR uses 16-VQFN (3x3), a smaller BGA-style package. Verify PCB layout compatibility and assembly capabilities before selection.

Q: Are moisture sensitivity differences significant?

A: LM2745MTC/NOPB has MSL 1 (Unlimited), providing superior moisture tolerance compared to UCC3585M and TPS53119RGTR, both rated MSL 2 (1 Year). For applications with extended storage or humid environments, LM2745MTC/NOPB offers handling advantages.