MAX665CPA Equivalent & Substitute Parts

Part Overview

The MAX665CPA is a charge pump switching regulator IC manufactured by Analog Devices Inc./Maxim Integrated, designed for power management applications requiring positive or negative fixed voltage outputs. This device operates as a ratiometric regulator with a single output capable of delivering 100mA across an input voltage range of 1.5V to 8V. The MAX665CPA is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design considerations.

Key Parameters

Parameter	Specification
Manufacturer Part Number	MAX665CPA
Manufacturer	Analog Devices Inc./Maxim Integrated
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)	8V
Voltage - Output	-Vin, 2Vin
Current - Output	100mA
Frequency - Switching	10kHz, 45kHz
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	0°C ~ 70°C (TA)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX665CPA is determined by the following critical parameters:

Topology: Charge pump architecture
Output Configuration: Capability to generate positive or negative outputs
Package / Case: 8-DIP (0.300", 7.62mm) form factor for through-hole mounting
Voltage - Input Range: Minimum 1.5V to maximum 8V compatibility
Voltage - Output: Support for -Vin and/or 2Vin output ratios
Current - Output: Minimum 100mA delivery capability
Switching Frequency: Operation at 10kHz or 45kHz

Substitute parts must maintain compatibility across these parameters to ensure functional equivalence in existing circuit designs.

Parameter Comparison

Parameter	MAX665CPA	MAX665CPA+	LMC7660IN/NOPB
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Texas Instruments
Topology	Charge Pump	Charge Pump	Charge Pump
Output Configuration	Positive or Negative	Positive or Negative	Negative
Output Type	Fixed	Fixed	Fixed
Number of Outputs	1	1	1
Voltage - Input (Min)	1.5V	1.5V	1.5V
Voltage - Input (Max)	8V	8V	10V
Voltage - Output	-Vin, 2Vin	-Vin, 2Vin	-Vin
Current - Output	100mA	100mA	Not specified
Frequency - Switching	10kHz, 45kHz	10kHz, 45kHz	10kHz
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	Not specified
Product Status	Obsolete	Not For New Designs	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX665CPA+ (Direct Manufacturer Variant)

The MAX665CPA+ is a variant of the original MAX665CPA manufactured by the same supplier. It maintains identical electrical and mechanical specifications, including output configuration capability for both positive and negative voltages, identical switching frequencies, and the same 8-DIP package. The MAX665CPA+ achieves ROHS3 compliance, whereas the original MAX665CPA is non-compliant. Product status is listed as "Not For New Designs," indicating limited future availability. This part is suitable for direct replacement in existing designs where the original MAX665CPA is currently deployed.

LMC7660IN/NOPB (Texas Instruments Alternative)

The LMC7660IN/NOPB is manufactured by Texas Instruments and shares the charge pump topology and 8-DIP package form factor. This device maintains the same minimum input voltage (1.5V) and supports a higher maximum input voltage (10V versus 8V). The LMC7660IN/NOPB is classified as Active, ensuring ongoing availability and support. However, this part differs in output configuration capability, supporting only negative output (-Vin) rather than both positive and negative outputs. The switching frequency is fixed at 10kHz. Selection of this alternative requires verification that negative-only output configuration meets circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX665CPA+ be used as a direct replacement for MAX665CPA?

A: Yes. The MAX665CPA+ maintains identical electrical specifications, output configuration, switching frequencies, and package form factor. The primary difference is improved RoHS compliance status (ROHS3 versus non-compliant). Functional compatibility is complete.

Q: Is LMC7660IN/NOPB a suitable substitute for MAX665CPA?

A: Substitution depends on circuit requirements. The LMC7660IN/NOPB shares the charge pump topology, 8-DIP package, and input voltage range. However, it supports only negative output configuration (-Vin), whereas MAX665CPA supports both positive and negative outputs. If the design requires positive output capability, LMC7660IN/NOPB is not suitable. If only negative output is required, compatibility exists with the noted switching frequency limitation (10kHz fixed).

Q: What is the significance of the 8-DIP package specification?

A: The 8-DIP (0.300", 7.62mm) package is a through-hole dual inline package. All listed parts share this identical package specification, ensuring mechanical and pin-compatible installation on existing printed circuit boards without layout modification.

Q: Why is MAX665CPA classified as obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production and support. The MAX665CPA+ and LMC7660IN/NOPB represent current alternatives with ongoing availability.

Q: What are the switching frequency differences between these parts?

A: MAX665CPA and MAX665CPA+ operate at either 10kHz or 45kHz. LMC7660IN/NOPB operates at a fixed 10kHz frequency. Circuit designs dependent on 45kHz operation cannot use the LMC7660IN/NOPB substitute.

Q: Are there compliance differences between the substitute parts?

A: Yes. MAX665CPA is RoHS non-compliant. Both MAX665CPA+ and LMC7660IN/NOPB are ROHS3 compliant. Applications requiring RoHS compliance must use either substitute part.

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