MIC4575-5.0BU Equivalent & Substitute Parts

Part Overview

The MIC4575-5.0BU is a buck and buck-boost switching regulator IC from Microchip Technology, delivering fixed 5V output at 1.7A (switch) in a TO-263-6 D2PAK package. The device operates across 4V to 24V input range with 200kHz switching frequency and supports both step-down and step-up/step-down topologies.

This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing status and current compliance certifications.

Key Parameters

Parameter	MIC4575-5.0BU
Manufacturer	Microchip Technology
Function	Step-Down, Step-Up/Step-Down
Output Voltage (Fixed)	5V
Output Current	1.7A (Switch)
Input Voltage Range	4V to 24V
Switching Frequency	200kHz
Package	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C to 85°C (TA)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Fixed output voltage of 5V
TO-263-6 D2PAK package (5 Leads + Tab)
Surface mount mounting type
Positive output configuration

Secondary Compatibility Parameters:

Input voltage range must encompass or exceed the original 4V minimum
Output current capability must meet or exceed 1.7A requirement
Operating temperature range must cover -40°C to 85°C minimum
Active product status and current RoHS3 compliance preferred

Substitute parts are grouped into two categories:

Direct Equivalent: MIC4575-5.0WU maintains identical electrical specifications and topology (buck and buck-boost) with active product status and RoHS3 compliance.

Functional Equivalents: Parts with buck topology only (AP1501-50K5G-13, LM2591 series, TL2575 series) provide 5V fixed output in the same package but with differing output current ratings, input voltage ranges, and switching frequencies. These parts satisfy the core functional requirement of 5V regulation in TO-263-6 packaging.

Parameter Comparison

Parameter	MIC4575-5.0BU	MIC4575-5.0WU	AP1501-50K5G-13	LM2591HVS-5.0/NOPB	LM2591HVSX-5.0/NOPB	TL2575-05IKTTR	TL2575-05IKTTRG3	TL2575HV-05IKTTR	TL2575HV-05QKTTRQ1
Manufacturer	Microchip	Microchip	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V	5V
Output Current	1.7A	1.7A	3A	1A	1A	1A	1A	1A	1A
Input Voltage (Min)	4V	4V	4.5V	4.5V	4.5V	4.75V	4.75V	4.75V	4.75V
Input Voltage (Max)	24V	24V	40V	60V	60V	40V	40V	60V	60V
Switching Frequency	200kHz	200kHz	150kHz	150kHz	150kHz	52kHz	52kHz	52kHz	52kHz
Topology	Buck, Buck-Boost	Buck, Buck-Boost	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Package	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-20°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	—	—	—	—	—	AEC-Q100

Engineering Selection Recommendations

MIC4575-5.0WU is the primary direct equivalent. It maintains identical electrical specifications, dual topology support (buck and buck-boost), and identical package. The part is active with ROHS3 compliance, making it the preferred replacement for obsolete MIC4575-5.0BU designs.

AP1501-50K5G-13 from Diodes Incorporated offers higher output current capability (3A) in the same package with active status and ROHS3 compliance. This part is suitable for designs where increased current headroom is acceptable and buck-only topology meets functional requirements. Input voltage range extends to 40V.

LM2591HVS-5.0/NOPB and LM2591HVSX-5.0/NOPB from Texas Instruments provide buck regulation with extended input voltage range (60V maximum) and wider operating temperature (-40°C to 125°C). Output current is rated at 1A, which is below the original 1.7A specification. These parts are active with ROHS3 compliance and suitable for applications where lower output current is acceptable.

TL2575-05IKTTR and TL2575-05IKTTRG3 deliver buck regulation with 52kHz switching frequency, lower than the original 200kHz. Input voltage range is 4.75V to 40V. Both parts are active with ROHS3 compliance. Packaging differs only in tape format (cut tape vs. tape & reel).

TL2575HV-05IKTTR and TL2575HV-05QKTTRQ1 extend input voltage capability to 60V maximum with 52kHz switching frequency. TL2575HV-05QKTTRQ1 carries AEC-Q100 automotive qualification. Both are active with ROHS3 compliance.

All substitute parts maintain TO-263-6 D2PAK packaging compatibility and positive 5V fixed output configuration. Selection should account for output current requirements, input voltage range needs, switching frequency implications for filtering, and temperature operating range constraints.

Frequently Asked Questions (FAQ)

Q: Can MIC4575-5.0WU directly replace MIC4575-5.0BU without circuit modifications?

A: Yes. MIC4575-5.0WU maintains identical electrical specifications, topology (buck and buck-boost), output voltage (5V), output current (1.7A), input voltage range (4V to 24V), switching frequency (200kHz), and TO-263-6 package. The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant original.

Q: Why do substitute parts show lower output current ratings (1A vs. 1.7A)?

A: The LM2591 and TL2575 series are rated at 1A output current, which is below the original 1.7A specification. These parts are functionally equivalent for applications requiring 5V regulation in the same package but cannot support the full 1.7A load. Design review is necessary to confirm whether reduced current capacity is acceptable.

Q: What is the significance of the 52kHz switching frequency in TL2575 parts versus the original 200kHz?

A: Lower switching frequency affects output filter design and EMI characteristics. The 52kHz frequency in TL2575 parts requires larger filter components compared to the 200kHz original. Circuit redesign may be necessary to maintain equivalent filtering performance and EMI compliance.

Q: Can I use AP1501-50K5G-13 if my application only requires 1.7A output?

A: Yes. AP1501-50K5G-13 is rated for 3A output current, which exceeds the 1.7A requirement. The higher current rating provides design margin. However, the part operates at 150kHz switching frequency and supports buck topology only, not buck-boost. Confirm that buck-only operation meets your application requirements.

Q: What is the difference between TL2575-05IKTTR and TL2575HV-05IKTTR?

A: Both parts operate at 52kHz with 1A output current and TO-263-6 packaging. The primary difference is maximum input voltage: TL2575-05IKTTR supports 40V maximum, while TL2575HV-05IKTTR supports 60V maximum. Select based on your input voltage range requirements.

Q: Is TL2575HV-05QKTTRQ1 suitable for automotive applications?

A: TL2575HV-05QKTTRQ1 carries AEC-Q100 automotive qualification, making it suitable for automotive-grade designs. It maintains identical electrical specifications to other TL2575HV variants (52kHz, 1A, 60V input maximum) with automotive-level reliability and testing.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All substitute parts listed are ROHS3 compliant. The original MIC4575-5.0BU is RoHS non-compliant. If RoHS compliance is a design requirement, MIC4575-5.0WU or any of the Texas Instruments or Diodes Incorporated alternatives satisfy this requirement.

Q: Can I use these parts interchangeably in existing PCB layouts?

A: All substitute parts use the TO-263-6 D2PAK package with identical pinout and footprint. PCB layout compatibility is maintained. However, circuit performance may differ due to variations in switching frequency, input voltage range, and output current rating. Electrical simulation and prototype testing are recommended to validate performance in your specific application.

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