MAX1623

Name: MAX1623
Brand: Analog Devices
Price: 10.22 USD
Availability: InStock

PRODUCTION

3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Industry's Smallest 3A DC-DC with Synchronous Rectifier

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $10.22

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Overview

±1% Output Accuracy, Including Line and Load Regulation
94% Efficiency
Internal Switches
- 55mΩ PMOS Power Switch
- 60mΩ NMOS Synchronous-Rectifier Switch
Guaranteed 3A Load Capability
Minimal External Components
Pin-Selectable Fixed 3.3V, 2.5V, or Adjustable (1.1V to 3.8V) Output Voltage
4.5V to 5.5V Input Voltage Range
400µA (typ) Supply Current
<1µA Shutdown Supply Current
Constant-Off-Time PWM Operation
Switching Frequencies Up to 350kHz
Idle Mode™ Operation at Light Loads
Thermal Shutdown Protection
Available in 20-Pin SSOP

Part Models: 2
1ku List Price: Starting From $10.22

Documentation

Data Sheet 1

MAX1623: 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches Data Sheet (Rev.2) 08/02/2002

Technical Articles 1

Dual Voltage Tracking Circuit for I/O, Microprocessor, and DSP Core Voltages 09/29/2003

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1623EAP+	20-Lead SSOP (7.33mm x 5.38mm x 1.99mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX1623EAP+T	20-Lead SSOP (7.33mm x 5.38mm x 1.99mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 20, 2026 - 2571B PIN/ERRATA
		pcn_2571b
MAX1623EAP+T	PRODUCTION	pcn_2571b

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 2
MAX1636	Obsolete	Low-Voltage, Precision Step-Down Controller for Portable CPU Power
MAX1644	PRODUCTION	2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Evaluation Kits

Evaluation Kit for the MAX1623

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Features and Benefits

+4.5V to +5.5V Input Voltage Range
Output Voltage
- 3.3V Preset
- 1.1V to 3.8V Adjustable (optional resistor-divider)
Guaranteed 3A Output Current
94% Efficiency (V_IN = 5V, V_OUT = 3.3V at I_OUT = 2A)
Internal 3A, 0.1Ω (max) MOSFET Switches
Up to 350kHz Switching Frequency
Thermal Shutdown at T_j = +145°C
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1623 evaluation kit (EV kit) provides a preset 3.3V output voltage from a +4.5V to +5.5V input source. It delivers up to 3A output current with greater than 90% efficiency.

The MAX1623 is a step-down switching regulator with synchronous rectification that includes two low-on-resistance 0.1Ω (max), 3A MOSFET power switches. It features a resistor-programmable fixed off-time as well as current-mode operation for superior load- and line-transient response.

The MAX1623 EV kit can also be used to evaluate other output voltages besides 3.3V by changing R_TOFF and the feedback resistors R1 and R2 located on the bottom of the board.

Applications

5V to 3.3V Conversion
CPU Daughter Card Supply
Desktop Computer Bus-Termination Supply
DSP Supply
Notebook Computer CPU I/O Supply

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