MAX1653ESE Buck Regulator Controller - Equivalent & Substitute Parts

Part Overview

The MAX1653ESE is a buck regulator positive output step-down DC-DC controller IC manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a transistor driver for step-down topology applications with a single output phase. The MAX1653ESE is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. Equivalent parts maintain identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Key Parameters

Parameter	Specification
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Power Management (PMIC)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Function	Step-Down
Topology	Buck
Output Type	Transistor Driver
Number of Outputs	1
Output Phases	1
Voltage - Supply (Vcc/Vdd)	4.5V ~ 30V
Frequency - Switching	150kHz, 300kHz
Duty Cycle (Max)	98%
Synchronous Rectifier	Yes
Clock Sync	Yes
Control Features	Enable, Soft Start
Operating Temperature	-40°C ~ 85°C (TA)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MAX1653ESE are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Identical package and case type: 16-SOIC (0.154", 3.90mm Width)
Matching supply voltage range: 4.5V ~ 30V
Identical switching frequency options: 150kHz, 300kHz
Matching duty cycle specification: 98% maximum
Identical control features: Enable, Soft Start
Matching operating temperature range: -40°C ~ 85°C
Identical output configuration: Positive, single output, single phase
Matching synchronous rectifier and clock sync capabilities

The MAX1653ESE+ qualifies as a direct manufacturer substitute with identical base product number (MAX1653) and all electrical parameters. The MAX1655ESE+ qualifies as a parametric equivalent with base product number MAX1655 while maintaining all critical electrical and mechanical specifications.

Parameter Comparison

Parameter	MAX1653ESE	MAX1653ESE+	MAX1655ESE+
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Package / Case	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Function	Step-Down	Step-Down	Step-Down
Topology	Buck	Buck	Buck
Output Type	Transistor Driver	Transistor Driver	Transistor Driver
Number of Outputs	1	1	1
Output Phases	1	1	1
Voltage - Supply (Vcc/Vdd)	4.5V ~ 30V	4.5V ~ 30V	4.5V ~ 30V
Frequency - Switching	150kHz, 300kHz	150kHz, 300kHz	150kHz, 300kHz
Duty Cycle (Max)	98%	98%	98%
Synchronous Rectifier	Yes	Yes	Yes
Clock Sync	Yes	Yes	Yes
Control Features	Enable, Soft Start	Enable, Soft Start	Enable, Soft Start
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The MAX1653ESE is obsolete and no longer in active production. Both substitute parts maintain complete electrical and mechanical compatibility with the original specification.

The MAX1653ESE+ is the direct manufacturer substitute, sharing the identical base product number MAX1653. This part is currently active and carries ROHS3 compliance certification, addressing regulatory requirements that the original part does not meet.

The MAX1655ESE+ is a parametric equivalent with base product number MAX1655. This part is also active and ROHS3 compliant. Selection between MAX1653ESE+ and MAX1655ESE+ depends on design documentation requirements and supplier availability, as both maintain identical electrical performance and package specifications.

Both substitute parts are available in tube packaging and carry REACH Unaffected status, matching the original part's regulatory profile in this regard.

Frequently Asked Questions (FAQ)

Q: Can MAX1653ESE+ directly replace MAX1653ESE in existing designs?

A: Yes. The MAX1653ESE+ maintains identical electrical specifications, package type (16-SOIC), and all functional parameters. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between MAX1653ESE+ and MAX1655ESE+?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The base product numbers differ (MAX1653 vs. MAX1655), but all critical parameters including supply voltage range, switching frequency, duty cycle, control features, and package type are identical. Selection depends on design documentation and supplier availability.

Q: Are there any package or pinout differences between these parts?

A: No. All three parts use the 16-SOIC package with 0.154" width (3.90mm). Package and pinout are identical across MAX1653ESE, MAX1653ESE+, and MAX1655ESE+.

Q: Why is the original MAX1653ESE obsolete?

A: The MAX1653ESE is classified as obsolete by the manufacturer. Active substitutes (MAX1653ESE+ and MAX1655ESE+) are available to support ongoing production and design requirements.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both MAX1653ESE+ and MAX1655ESE+ carry ROHS3 compliance certification, addressing current regulatory standards. The original MAX1653ESE is RoHS non-compliant.

Q: Are there inventory differences between the substitute parts?

A: Yes. MAX1653ESE+ has 893 pieces in stock, while MAX1655ESE+ has 2200 pieces in stock. Availability may influence selection for high-volume production requirements.

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