MAX1651

PRODUCTION

5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controller

High-Efficiency Step-Down Controller Operates with 4 to 8 Cells

Data Sheet (Rev. 3) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.92

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Part Details

More than 90% Efficiency (10mA to 1.5A Loads)
More than 12.5W Output Power
Less than 0.3V Dropout Voltage at 500mA
100µA Max Quiescent Supply Current
5µA Max Shutdown Supply Current
16V Max Input Voltage
5V (MAX1649), 3.3V (MAX1651), or Adjustable Output Voltage
Current-Limited Control Scheme
Up to 300kHz Switching Frequency
Up to 96.5% Duty Cycle

Part Models: 4
1ku List Price: Starting From $2.92

Documentation

Data Sheet 1

MAX1649-MAX1651: 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controller Data Sheet (Rev.3) 01/28/2010

Technical Articles 2

Energy Management for Small Portable Systems 03/15/2000

Reduce Standby Power Drains with Ultra-Low-Current, Pulse-Frequency-Modulated (PFM) DC-DC Converters 03/19/2009

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
MAX1651CSA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX1651CSA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX1651ESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX1651ESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

May 22, 2018 - 1702N ASSEMBLY
		pcn_1702n
MAX1651CSA+	PRODUCTION
MAX1651CSA+T	PRODUCTION
Oct 30, 2020 - 1702R2 ASSEMBLY
		pcn_1702r2
MAX1651ESA+	PRODUCTION
MAX1651ESA+T	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Internal Power Switch Buck Regulators 1
MAX639	PRODUCTION	5V/3.3V/3V Adjustable, High-Efficiency, Low-I_Q, Step-Down DC-DC Converters
Micropower Buck Regulators 1
MAX1626	PRODUCTION	5V/3.3V or Adjustable, 100% Duty Cycle, High-Efficiency, Step-Down DC-DC Controllers

Evaluation Kits

Evaluation Kit for the MAX649, MAX651, MAX652 and MAX1649, MAX1651

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Features and Benefits

+5.5V to +16.5V Input Supply Range
Over 90% Efficiency for 10mA to 1.5A Loads
100µA (max) Quiescent Supply Current
Fixed 5V or Optional Adjustable Output Voltage
1.5A Output Current Capability
Fully Assembled and Tested

Product Details

The MAX1649 evaluation kit (EV kit) provides a regulated 5V output voltage from a 5.5V to 16.5V source. The circuit is configured to deliver up to 1.5A of output current using all surface-mount components. The MAX1649's low quiescent current and unique current-limited PFM control scheme provide high efficiency over a wide range of load currents.

The MAX1649 EV kit can also be used to evaluate the MAX1651 (3.3V output), MAX649, MAX651, and MAX652. However, the MAX1649/MAX1651 are improved versions of the MAX649/MAX651, and are recommended for new designs.

Applications

5V to 3.3V Green PC Applications
Battery-Powered Applications
High-Efficiency Step-Down Regulation
PDAs

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