LM2660MX Equivalent & Substitute Parts

Part Overview

The LM2660MX is a charge pump switching regulator IC manufactured by Texas Instruments, designed for power management applications requiring positive or negative fixed output voltage configurations. This device operates as a ratiometric regulator with a single output capable of delivering 100mA across input voltage ranges of 1.5V to 5.5V. The LM2660MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives from both Texas Instruments and Analog Devices Inc./Maxim Integrated provide direct functional replacement with enhanced product status and compliance certifications.

Key Parameters

Parameter	LM2660MX
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Topology	Charge Pump
Output Configuration	Positive or Negative
Output Type	Fixed
Number of Outputs	1
Voltage - Input (Min)	1.5V
Voltage - Input (Max)	5.5V
Voltage - Output (Min/Fixed)	-Vin, 2Vin, Vin/2
Current - Output	100mA
Frequency - Switching	5kHz, 40kHz
Operating Temperature	-40°C ~ 85°C (TJ)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM2660MX is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Charge Pump
Output Configuration: Positive or Negative
Output Type: Fixed
Number of Outputs: 1
Current - Output: 100mA
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Voltage Compatibility Parameters:

Voltage - Input (Min): 1.5V minimum
Voltage - Input (Max): 5.5V maximum
Voltage - Output (Min/Fixed): Must support -Vin, 2Vin, Vin/2 configurations

All substitute parts listed maintain identical or compatible electrical specifications within these parameters. Variations in switching frequency, operating temperature range, and RoHS compliance status do not preclude substitution when core electrical and mechanical parameters align.

Parameter Comparison

Parameter	LM2660MX	LM2660MX/NOPB	LTC660CS8#PBF	LTC660CS8#TRPBF	MAX660CSA+	MAX660CSA+T	MAX660ESA+	MAX660ESA+T
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Topology	Charge Pump	Charge Pump	Charge Pump	Charge Pump	Charge Pump	Charge Pump	Charge Pump	Charge Pump
Output Configuration	Positive or Negative	Positive or Negative	Positive or Negative	Positive or Negative	Positive or Negative	Positive or Negative	Positive or Negative	Positive or Negative
Output Type	Fixed	Fixed	Fixed	Fixed	Fixed	Fixed	Fixed	Fixed
Number of Outputs	1	1	1	1	1	1	1	1
Voltage - Input (Min)	1.5V	1.5V	1.5V, 2.5V	1.5V, 2.5V	1.5V	1.5V	1.5V	1.5V
Voltage - Input (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Voltage - Output (Min/Fixed)	-Vin, 2Vin, Vin/2	-Vin, 2Vin, Vin/2	-Vin, 2Vin, Vin/2	-Vin, 2Vin, Vin/2	-Vin, 2Vin	-Vin, 2Vin	-Vin, 2Vin	-Vin, 2Vin
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Frequency - Switching	5kHz, 40kHz	5kHz, 40kHz	10kHz, 80kHz	10kHz, 80kHz	10kHz, 80kHz	10kHz, 80kHz	10kHz, 80kHz	10kHz, 80kHz
Operating Temperature	-40°C ~ 85°C (TJ)	-40°C ~ 85°C (TJ)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Texas Instruments): LM2660MX/NOPB is the active equivalent from Texas Instruments, maintaining identical electrical specifications and operating temperature range (-40°C ~ 85°C). This part transitions from obsolete to active product status while achieving ROHS3 compliance. Selection of LM2660MX/NOPB is appropriate for designs requiring continuity with the original LM2660MX specification.

Analog Devices Inc./Maxim Integrated Alternatives: The LTC660CS8 series and MAX660 series provide functional substitution with ROHS3 compliance. LTC660CS8#PBF and LTC660CS8#TRPBF operate within 0°C ~ 70°C temperature range, suitable for commercial and industrial applications with narrower thermal requirements. MAX660CSA+ and MAX660CSA+T similarly operate within 0°C ~ 70°C, while MAX660ESA+ and MAX660ESA+T extend to -40°C ~ 85°C, matching the original LM2660MX thermal specification.

Output Configuration Consideration: MAX660 variants support -Vin and 2Vin output configurations, omitting the Vin/2 option available in LM2660MX and LTC660CS8 devices. Selection of MAX660 alternatives requires confirmation that Vin/2 output is not required in the application.

Packaging and Inventory: All substitute parts maintain 8-SOIC surface mount packaging. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) are available across the substitute portfolio, accommodating different procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2660MX/NOPB directly replace LM2660MX in existing designs? A: Yes. LM2660MX/NOPB maintains identical electrical specifications, output configurations, and operating temperature range. The primary difference is product status transition from obsolete to active and achievement of ROHS3 compliance.

Q: What is the key difference between LTC660CS8 and MAX660 substitutes? A: LTC660CS8 supports three output configurations (-Vin, 2Vin, Vin/2), matching the original LM2660MX. MAX660 variants support two configurations (-Vin, 2Vin), omitting Vin/2. Selection depends on whether Vin/2 output is required in the application.

Q: Are there operating temperature differences between substitute options? A: Yes. LTC660CS8#PBF, LTC660CS8#TRPBF, MAX660CSA+, and MAX660CSA+T operate within 0°C ~ 70°C. MAX660ESA+ and MAX660ESA+T extend to -40°C ~ 85°C, matching the original LM2660MX specification. Selection should align with application thermal requirements.

Q: Do all substitutes meet RoHS compliance? A: Yes. All listed substitute parts achieve ROHS3 compliance, whereas the original LM2660MX is RoHS non-compliant. This compliance improvement supports modern procurement and environmental standards.

Q: What packaging options are available for substitutes? A: Substitute parts are available in Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging formats. All maintain 8-SOIC (0.154", 3.90mm Width) surface mount package geometry, ensuring PCB footprint compatibility.

Q: Can switching frequency differences affect circuit performance? A: LM2660MX operates at 5kHz and 40kHz, while substitute parts operate at 10kHz and 80kHz. Switching frequency differences may affect EMI characteristics, filtering requirements, and component selection in the power delivery network. Circuit validation is necessary when substituting parts with different switching frequencies.

Q: Is the LTC660CS8 or MAX660 series preferred for new designs? A: Both series provide active product status and ROHS3 compliance suitable for new designs. Selection between LTC660CS8 and MAX660 depends on output configuration requirements (Vin/2 support) and operating temperature range. Both are manufactured by Analog Devices Inc./Maxim Integrated with established supply chain availability.

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