LP2985-29DBVR Equivalent & Substitute Parts

Part Overview

The LP2985-29DBVR is a linear voltage regulator IC from Texas Instruments, classified as a positive fixed output power management component in the SOT-23-5 package. This device delivers 150mA at a fixed 2.9V output with a maximum dropout voltage of 0.58V at rated current. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP2985-29DBVR
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	2.9V
Current - Output	150mA
Voltage - Input (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Package / Case	SC-74A, SOT-753 (SOT-23-5)
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP2985-29DBVR is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 2.9V fixed
Output current capability: minimum 150mA
Package type: SOT-23-5 (SC-74A, SOT-753)
Input voltage rating: 16V or higher
Operating temperature range: -40°C to 125°C
Mounting type: Surface Mount
Control features: Enable function
Protection features: Over Current, Over Temperature

Substitution Categories:

Direct Equivalents (Identical Specifications): Parts with matching 2.9V fixed output, 150mA current rating, and identical electrical characteristics. These are pin-compatible replacements with no design modifications required.

Parametric Equivalents (Enhanced Performance): Parts with 2.9V fixed output and equal or greater current capacity (150mA or higher), maintaining compatibility while offering improved performance characteristics such as lower dropout voltage or better PSRR.

Functional Alternatives (Different Output Type): Parts with adjustable output capability that can be configured to 2.9V, offering design flexibility for applications requiring voltage adjustment.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage (Max)	Quiescent Current	PSRR	Product Status	Package
LP2985-29DBVR	Texas Instruments	2.9V Fixed	150mA	0.58V @ 150mA	95 µA	45dB (1kHz)	Obsolete	SOT-23-5
LP2985IM5-2.9/NOPB	Texas Instruments	2.9V Fixed	150mA	0.58V @ 150mA	95 µA	45dB (1kHz)	Obsolete	SOT-23-5
LP2985A-29DBVR	Texas Instruments	2.9V Fixed	150mA	0.58V @ 150mA	95 µA	45dB (1kHz)	Active	SOT-23-5
LP2985AIM5-2.9/NOPB	Texas Instruments	2.9V Fixed	150mA	0.58V @ 150mA	95 µA	45dB (1kHz)	Obsolete	SOT-23-5
MIC5205-2.9YM5-TR	Microchip Technology	2.9V Fixed	150mA	0.35V @ 150mA	150 µA	75dB (100Hz)	Active	SOT-23-5
MIC5207-2.9YM5-TR	Microchip Technology	2.9V Fixed	180mA	0.4V @ 150mA	170 µA	Not Specified	Active	SOT-23-5
TPS7A2401DBVR	Texas Instruments	1.24V to 17.75V Adjustable	200mA	0.25V @ 200mA	4.5 µA	75dB ~ 62dB (10Hz ~ 1kHz)	Active	SOT-23-5

Engineering Selection Recommendations

For Direct Replacement (No Design Changes):

LP2985A-29DBVR is the primary recommended substitute. This part maintains identical electrical specifications to the LP2985-29DBVR while offering active product status, ensuring long-term availability and manufacturing support. Both parts are Texas Instruments products with matching performance characteristics and are fully pin-compatible.

For Enhanced Performance with Active Status:

MIC5205-2.9YM5-TR from Microchip Technology provides improved performance over the original part. It maintains the 2.9V fixed output and 150mA current rating while delivering lower dropout voltage (0.35V versus 0.58V) and superior PSRR (75dB versus 45dB). This part is currently active and suitable for new designs or production transitions.

MIC5207-2.9YM5-TR offers increased output current capacity (180mA versus 150mA) with improved dropout voltage (0.4V) while maintaining the 2.9V fixed output. This part provides design margin for applications approaching the original current limit.

For Adjustable Output Applications:

TPS7A2401DBVR is a functional alternative for applications requiring voltage adjustment capability. This part can be configured to output 2.9V through external resistor networks and offers superior performance metrics including lower dropout voltage (0.25V), significantly lower quiescent current (4.5 µA), and higher output current (200mA). This part is active and suitable for new designs requiring flexibility.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 classification, matching the regulatory profile of the original part. Moisture sensitivity level remains at MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can LP2985A-29DBVR be used as a direct replacement for LP2985-29DBVR?

A: Yes. LP2985A-29DBVR is a direct replacement with identical electrical specifications, pin configuration, and package type. The primary difference is product status: LP2985A-29DBVR is active while LP2985-29DBVR is obsolete. No circuit modifications are required.

Q: What is the difference between MIC5205-2.9YM5-TR and MIC5207-2.9YM5-TR?

A: Both parts maintain 2.9V fixed output and SOT-23-5 packaging. MIC5205 is rated for 150mA output current with 0.35V dropout voltage. MIC5207 provides higher output current (180mA) with 0.4V dropout voltage. Selection depends on application current requirements.

Q: Can TPS7A2401DBVR replace LP2985-29DBVR without circuit modifications?

A: TPS7A2401DBVR requires external resistor configuration to set output voltage to 2.9V, as it is an adjustable regulator. This necessitates circuit design changes. However, it offers superior performance characteristics and is recommended for new designs where voltage adjustment capability is beneficial.

Q: Are all substitute parts available in the same packaging?

A: Yes. All recommended substitutes use SOT-23-5 packaging (SC-74A, SOT-753), ensuring mechanical and electrical compatibility with the original footprint.

Q: What are the key performance improvements offered by Microchip alternatives?

A: MIC5205-2.9YM5-TR and MIC5207-2.9YM5-TR offer lower dropout voltage and higher PSRR compared to the original LP2985-29DBVR. MIC5205 matches the 150mA current rating with improved dropout (0.35V versus 0.58V). MIC5207 adds 30mA additional current capacity while maintaining improved dropout voltage.

Q: Which substitute is recommended for new production designs?

A: LP2985A-29DBVR is recommended for designs requiring direct compatibility. For new designs, MIC5205-2.9YM5-TR or MIC5207-2.9YM5-TR offer active status with enhanced performance. TPS7A2401DBVR is suitable for applications requiring adjustable output capability.

Q: Do all parts meet the same compliance standards?

A: Yes. All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels (MSL 1 - Unlimited), ensuring regulatory equivalence.

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