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LM2660M Equivalent & Substitute Parts
Part Overview
The LM2660M 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 delivering 100mA across an input voltage range of 1.5V to 5.5V. The LM2660M is classified as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and legacy system support.
Substiute Parts
Key Parameters
| Parameter | LM2660M Specification |
|---|---|
| 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) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the LM2660M is determined by strict alignment across the following critical parameters:
Mandatory Matching Parameters:
- Topology: Charge Pump
- Output Configuration: Positive or Negative
- Output Type: Fixed
- Number of Outputs: 1
- Voltage - Input Range: 1.5V to 5.5V minimum
- Voltage - Output Options: Must include -Vin, 2Vin, Vin/2
- Current - Output: 100mA
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- RoHS Status: ROHS3 Compliant
- MSL: 1 (Unlimited)
Acceptable Variations:
- Switching Frequency: May differ (5kHz, 10kHz, 40kHz, 80kHz acceptable)
- Operating Temperature Range: May be narrower or equal
- Manufacturer: Texas Instruments or Analog Devices Inc./Maxim Integrated
- Product Status: Active preferred; Last Time Buy acceptable
- Packaging Format: Tube, Cut Tape (CT) & Digi-Reel®, or Tape & Reel (TR)
Substitute parts meeting these criteria maintain functional and electrical equivalence for charge pump voltage conversion applications.
Parameter Comparison
| Parameter | LM2660M | LM2660M/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 | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim |
| 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) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Last Time Buy | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Recommendation: LM2660M/NOPB
The LM2660M/NOPB is the direct equivalent from Texas Instruments with Active product status. This part maintains identical electrical specifications and operating temperature range (-40°C to 85°C) as the original LM2660M. Selection of this part ensures continuity with the original design without thermal or functional derating.
Secondary Recommendations: MAX660ESA+ and MAX660ESA+T
The MAX660ESA+ and MAX660ESA+T from Analog Devices Inc./Maxim Integrated provide full functional equivalence with Active product status and matching operating temperature range (-40°C to 85°C). These parts support the complete output voltage configuration set (-Vin, 2Vin, Vin/2) and are suitable for designs requiring extended temperature operation. The MAX660ESA+T variant in Cut Tape & Digi-Reel® packaging offers higher inventory availability (25,440 units).
Tertiary Recommendations: LTC660CS8#PBF and LTC660CS8#TRPBF
The LTC660CS8#PBF and LTC660CS8#TRPBF from Analog Devices Inc. are functionally equivalent with Active product status. These parts operate within a narrower temperature range (0°C to 70°C) and feature higher switching frequencies (10kHz, 80kHz). Selection is appropriate for applications within the 0°C to 70°C operating window where the increased switching frequency does not present EMI or thermal concerns.
Limited Substitution: MAX660CSA+, MAX660CSA+T
The MAX660CSA+ and MAX660CSA+T support only -Vin and 2Vin output configurations, excluding the Vin/2 option. These parts are suitable only for designs not requiring the Vin/2 output mode. Operating temperature range is limited to 0°C to 70°C.
Compliance Basis:
All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and identical package specifications (8-SOIC, 0.154", 3.90mm Width). Selection should prioritize parts with Active product status to ensure long-term availability and manufacturing support.
Frequently Asked Questions (FAQ)
Q: Can the LM2660M be replaced with MAX660CSA+ or MAX660CSA+T?
A: Partial substitution only. The MAX660CSA+ and MAX660CSA+T support -Vin and 2Vin output configurations but do not include the Vin/2 option. If your design requires Vin/2 output, these parts are not suitable. Additionally, the operating temperature range is limited to 0°C to 70°C compared to the LM2660M's -40°C to 85°C range.
Q: What is the difference between LTC660CS8#PBF and LTC660CS8#TRPBF?
A: Both parts are electrically identical. The primary difference is packaging format: LTC660CS8#PBF is supplied in Tube packaging, while LTC660CS8#TRPBF is supplied in Tape & Reel (TR) format. The Tape & Reel variant offers higher inventory availability (5,350 units) and is typically preferred for high-volume production.
Q: Are there temperature derating considerations when substituting with LTC660CS8 variants?
A: Yes. The LTC660CS8#PBF and LTC660CS8#TRPBF operate within 0°C to 70°C, which is narrower than the LM2660M's -40°C to 85°C range. If your application requires operation below 0°C or above 70°C, these parts are not suitable. The MAX660ESA+, MAX660ESA+T, and LM2660M/NOPB maintain the full -40°C to 85°C operating range.
Q: Why do some substitute parts have different switching frequencies?
A: Switching frequency variation is an acceptable parameter difference for charge pump regulators. The LM2660M operates at 5kHz or 40kHz, while LTC660 and MAX660 variants operate at 10kHz or 80kHz. Higher switching frequencies may reduce output ripple and component size but do not affect functional equivalence for fixed output voltage applications.
Q: Is the LM2660M/NOPB the best substitute for the LM2660M?
A: Yes, for applications requiring identical specifications and full temperature range operation. The LM2660M/NOPB is the direct Active equivalent from Texas Instruments with matching electrical characteristics and operating temperature (-40°C to 85°C). It is the recommended first choice for design continuity.
Q: Can I use MAX660ESA+ in place of LM2660M for all applications?
A: Yes, with full functional equivalence. The MAX660ESA+ supports all output voltage configurations (-Vin, 2Vin, Vin/2), maintains the -40°C to 85°C operating temperature range, and is ROHS3 compliant with MSL Level 1. It is suitable as a direct replacement for all LM2660M applications.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in three packaging formats: Tube (standard packaging for lower volumes), Cut Tape (CT) & Digi-Reel® (for semi-automated assembly), and Tape & Reel (TR) (for high-volume automated production). All variants maintain identical electrical specifications and 8-SOIC package dimensions.
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