MAX639

PRODUCTION

5V/3.3V/3V Adjustable, High-Efficiency, Low-I_Q, Step-Down DC-DC Converters

Low Supply Current, High-Efficiency Over Wide Load Range

Data Sheet (Rev. 4) Product Selection Table

Part Models: 6
1ku List Price: Starting From $4.62

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Overview

High Efficiency for a Wide Range of Load Currents
10µA Quiescent Current
Output Currents Up to 225mA
Preset or Adjustable Output Voltage:
- 5.0V (MAX639)
- 3.3V (MAX640)
- 3.0V (MAX653)
Low-Battery Detection Comparator
Current-Limiting PFM Control Scheme

The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.

The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.

Applications

5V to 3.3V Conversion
9V Battery to 5V, 3.3V, or 3V Conversion
High-Efficiency Linear Regulator Replacement
Portable Instruments and Handy-Terminals

Part Models: 6
1ku List Price: Starting From $4.62

Documentation

Data Sheet 1

MAX639-MAX653: 5V/3.3V/3V Adjustable, High-Efficiency, Low-I_Q, Step-Down DC-DC Converters Data Sheet (Rev.4) 09/07/2005

Design Note 1

Solar Cells and Switching Regular Charge Batteries at Optimum Rates 07/09/1998

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
MAX639CPA+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX639CSA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX639CSA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX639EPA+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX639ESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX639ESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 2, 2023 - 2361E WAFER FAB
		pcn_2361e
MAX639CSA+	PRODUCTION
MAX639CSA+T	PRODUCTION
MAX639ESA+	PRODUCTION
MAX639ESA+T	PRODUCTION
Oct 30, 2020 - 1702R2 ASSEMBLY
		pcn_1702r2
MAX639CSA+	PRODUCTION
MAX639CSA+T	PRODUCTION
MAX639ESA+	PRODUCTION
MAX639ESA+T	PRODUCTION

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 1
MAX649		5V/3.3V/3V or Adjustable, High-Efficiency, Low-I_Q, Step-Down DC-DC Controllers

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