LM2705MFX-ADJ LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM2705MFX-ADJ is a LED Driver IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device functions as a 1-output DC-DC regulator with step-up (boost) topology, delivering 150mA output current for LED backlight applications. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM2705MFX-ADJ
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply Range	2.2V to 7V
Output Voltage	20V
Output Current	150mA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 85°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM2705MFX-ADJ are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC Regulator
Output Configuration: Single output
Supply Voltage Range: Minimum 2.2V input capability
Output Current Capability: 150mA or greater
Package Type: Surface mount with compatible pinout
Application: LED backlight driver
Internal Switch: Required

Substitution Categories:

Parametric Equivalents (Direct Replacements) – Parts with identical electrical specifications and compatible packaging
Manufacturer Recommended Alternatives – Parts with enhanced specifications or different topologies suitable for LED driver applications

Parameter Comparison

Parameter	LM2705MFX-ADJ	LM2705MF-ADJ/NOPB	LM2705MFX-ADJ/NOPB	BD6069GUT-E2	LT3477EUF#TRPBF	LT3592EDDB#TRMPBF	MIC3289-24YML-TR	STCF05TBR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	ROHM Semiconductor	Analog Devices Inc.	Analog Devices Inc.	Microchip Technology	STMicroelectronics
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Flyback, SEPIC, Buck, Boost	Step-Down (Buck)	Step-Up (Boost)	Step-Up (Boost)
Supply Voltage (Min)	2.2V	2.2V	2.2V	2.7V	2.5V	3.6V	2.5V	2.5V
Supply Voltage (Max)	7V	7V	7V	5.5V	25V	36V	6.5V	5.5V
Output Voltage	20V	20V	20V	18V	Not specified	30V	Not specified	10.2V
Output Current / Switch Current	150mA	150mA	150mA	270mA (Switch)	3A (Switch)	50mA, 500mA	1.2A (Switch)	400mA (Flash)
Package Type	SOT-23-5	SOT-23-5	SOT-23-5	8-WFBGA, CSPBGA	20-QFN (4x4)	10-DFN (3x2)	8-MLF® (2x2)	25-TFBGA (3x3)
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-30°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 85°C
Product Status	Obsolete	Active	Active	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Frequency	Not specified	Not specified	Not specified	1MHz	200kHz to 4.6MHz	400kHz to 2.2MHz	1.2MHz	1.8MHz

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

LM2705MF-ADJ/NOPB and LM2705MFX-ADJ/NOPB are parametric equivalents of the obsolete LM2705MFX-ADJ. Both parts maintain identical electrical specifications (2.2V to 7V input, 20V output, 150mA current) and package compatibility (SOT-23-5). Both are currently in active product status and ROHS3 compliant, providing a straightforward migration path for existing designs.

Alternative Selections Based on Application Requirements:

For designs requiring enhanced current capability or extended temperature range, the following active parts provide suitable alternatives:

MIC3289-24YML-TR (Microchip Technology): Maintains step-up boost topology with 2.5V to 6.5V input range and 1.2A switch current. Offers extended operating temperature to 125°C and ROHS3 compliance. Suitable for backlight applications requiring higher current capacity.
LT3477EUF#TRPBF (Analog Devices Inc.): Provides multi-topology capability (Flyback, SEPIC, Buck, Boost) with 2.5V to 25V input range and 3A switch current. Offers extended frequency range (200kHz to 4.6MHz) and ROHS3 compliance. Suitable for designs requiring topology flexibility.
STCF05TBR (STMicroelectronics): Step-up boost topology with 2.5V to 5.5V input and 400mA flash current. Designed for camera flash applications with 10.2V output. ROHS3 compliant and active product status.

Parts with obsolete status (BD6069GUT-E2) should be avoided for new designs despite functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can LM2705MF-ADJ/NOPB directly replace LM2705MFX-ADJ?

A: Yes. Both parts are parametric equivalents with identical electrical specifications and SOT-23-5 packaging. The primary difference is packaging format (Tape & Reel vs. Cut Tape/Digi-Reel). Both are ROHS3 compliant and in active product status, making LM2705MF-ADJ/NOPB the recommended direct replacement.

Q: What is the difference between LM2705MFX-ADJ and LM2705MFX-ADJ/NOPB?

A: Both parts are electrically identical with identical packaging (SOT-23-5). The "/NOPB" suffix indicates the part is supplied without lead (Pb) plating, confirming ROHS3 compliance. Both are suitable replacements for the obsolete LM2705MFX-ADJ.

Q: Can I use MIC3289-24YML-TR as a substitute if my design requires higher current?

A: Yes, if your circuit design can accommodate the higher switch current (1.2A vs. 150mA). The MIC3289-24YML-TR maintains step-up boost topology and similar input voltage range (2.5V to 6.5V). However, circuit redesign may be necessary to utilize the increased current capability and different package format (8-MLF vs. SOT-23-5).

Q: Why is BD6069GUT-E2 listed as an alternative if it is obsolete?

A: BD6069GUT-E2 is included for reference as a manufacturer-recommended alternative with compatible topology and application. However, it is currently obsolete and should not be selected for new designs. Active alternatives such as MIC3289-24YML-TR or LT3477EUF#TRPBF are preferred.

Q: What are the package compatibility considerations?

A: The LM2705MFX-ADJ uses SOT-23-5 packaging. Direct replacements (LM2705MF-ADJ/NOPB and LM2705MFX-ADJ/NOPB) maintain this package format. Alternative parts use different packages: MIC3289-24YML-TR (8-MLF), LT3477EUF#TRPBF (20-QFN), STCF05TBR (25-TFBGA), and LT3592EDDB#TRMPBF (10-DFN). PCB layout redesign is required when switching to alternative packages.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original LM2705MFX-ADJ is RoHS non-compliant. Migration to any active substitute part ensures compliance with current environmental regulations.

Q: Can LT3592EDDB#TRMPBF replace LM2705MFX-ADJ?

A: LT3592EDDB#TRMPBF uses step-down (buck) topology, which differs from the step-up (boost) topology of LM2705MFX-ADJ. While both are LED driver regulators, the different topologies require different circuit designs and are not direct substitutes. This part is suitable only if your application can accommodate buck topology operation.

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