MAX1044ESA Equivalent & Substitute Parts

Part Overview

The MAX1044ESA 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 8-SOIC surface mount device delivers 20mA output current with a 10kHz switching frequency and operates across a 1.5V to 10V input range.

The MAX1044ESA is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX1044ESA
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Topology	Charge Pump
Output Configuration	Positive or Negative
Number of Outputs	1
Voltage - Input (Min)	1.5V
Voltage - Input (Max)	10V
Voltage - Output (Min/Fixed)	-Vin, nVin, Vin/2
Current - Output	20mA
Frequency - Switching	10kHz
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX1044ESA is determined by strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

Package / Case: 8-SOIC (0.154", 3.90mm Width)
Topology: Charge Pump
Output Configuration: Positive or Negative
Number of Outputs: 1
Voltage - Input Range: 1.5V to 10V
Frequency - Switching: 10kHz
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Output (Min/Fixed): Devices supporting -Vin and 2Vin configurations are acceptable, as these represent compatible output voltage options within the charge pump topology
Current - Output: 20mA minimum requirement
Operating Temperature: Extended range (-40°C to 85°C) preferred; narrower ranges acceptable if meeting application requirements
Product Status: Active status preferred for new designs; obsolete status acceptable only for legacy system maintenance

All identified substitute parts meet these criteria and are pin-compatible 8-SOIC devices with identical switching frequency and input voltage specifications.

Parameter Comparison

Parameter	MAX1044ESA	ICL7660ISA+	MAX1044ESA+	TC7660EOA	TL7660CD
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Microchip Technology	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
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)
Topology	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
Number of Outputs	1	1	1	1	1
Voltage - Input (Min)	1.5V	1.5V	1.5V	1.5V	1.5V
Voltage - Input (Max)	10V	10V	10V	10V	10V
Voltage - Output (Min/Fixed)	-Vin, nVin, Vin/2	-Vin, nVin, Vin/2	-Vin, nVin, Vin/2	-Vin, 2Vin	-Vin, 2Vin
Current - Output	20mA	20mA	20mA	20mA	Not specified
Frequency - Switching	10kHz	10kHz	10kHz	10kHz	10kHz
Operating Temperature	-40°C ~ 85°C (TA)	-20°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MAX1044ESA+

The MAX1044ESA+ is the direct active equivalent from the original manufacturer. It maintains identical electrical specifications including the full -40°C to 85°C operating temperature range and supports all three output voltage configurations (-Vin, nVin, Vin/2). ROHS3 compliance and active product status make this the preferred choice for new designs requiring MAX1044ESA replacement.

Secondary Recommendation: ICL7660ISA+

The ICL7660ISA+ is an active Analog Devices product with full electrical compatibility. Operating temperature range is -20°C to 85°C, which is acceptable for applications not requiring the extended -40°C minimum specification. ROHS3 compliance and equivalent output voltage options make this suitable for standard industrial applications.

Alternative Recommendations: TC7660EOA and TL7660CD

TC7660EOA (Microchip Technology) and TL7660CD (Texas Instruments) are active alternatives with identical input voltage ranges, switching frequency, and package specifications. Both support -Vin and 2Vin output configurations and operate across -40°C to 85°C. These options provide multi-source availability and ROHS3 compliance. Note that TC7660EOA specifies 20mA output current, while TL7660CD does not specify output current in the provided data.

Compliance Consideration:

All substitute parts are ROHS3 compliant, addressing environmental and regulatory requirements that the obsolete MAX1044ESA does not meet. Selection should prioritize active products with complete temperature range specifications matching application requirements.

Frequently Asked Questions (FAQ)

Q: Can ICL7660ISA+ replace MAX1044ESA in applications requiring -40°C operation?

A: ICL7660ISA+ operates from -20°C to 85°C. Applications requiring -40°C minimum operation should use MAX1044ESA+, TC7660EOA, or TL7660CD, which all specify -40°C to 85°C operating range.

Q: Are TC7660EOA and TL7660CD fully compatible with MAX1044ESA?

A: Both devices are pin-compatible 8-SOIC packages with identical input voltage ranges (1.5V to 10V), switching frequency (10kHz), and output configurations (positive or negative). Output voltage options differ slightly (-Vin, 2Vin versus -Vin, nVin, Vin/2), but both support the primary negative and positive voltage generation modes.

Q: What is the significance of the output voltage configuration differences?

A: MAX1044ESA and ICL7660ISA+ support three output modes: -Vin (negative), nVin (programmable), and Vin/2 (half voltage). TC7660EOA and TL7660CD support -Vin and 2Vin (doubled voltage). Selection depends on required output voltage levels in the application circuit.

Q: Why is MAX1044ESA+ preferred over other substitutes?

A: MAX1044ESA+ is the direct active equivalent from the original manufacturer with identical specifications, including full -40°C to 85°C temperature range and all three output voltage configurations. This eliminates any potential compatibility questions for legacy system maintenance or new designs.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (ICL7660ISA+, MAX1044ESA+, TC7660EOA, TL7660CD) are ROHS3 compliant. The original MAX1044ESA is RoHS non-compliant, making substitution necessary for applications subject to environmental regulations.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All substitute parts use identical 8-SOIC (0.154", 3.90mm Width) packaging and are pin-compatible. PCB layout and footprints designed for MAX1044ESA accommodate all listed substitutes without modification.

Q: What is the current output specification for TL7660CD?

A: Current output is not specified in the provided data for TL7660CD. Applications requiring confirmed 20mA output capability should reference the manufacturer datasheet or select alternatives with explicit 20mA ratings (MAX1044ESA+, ICL7660ISA+, TC7660EOA).

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