MAX1655

PRODUCTION

High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP

10A DSP/CPU Core Supply with Secondary Outputs in Space-Saving QSOP Package

Data Sheet (Rev. 1) Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.81

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Overview

96% Efficiency
Small, 16-Pin QSOP Package (half the size of a 16-pin narrow SO)
Pin-Compatible with MAX797 (MAX1653/MAX1655)
Output Voltage Down to 1V (MAX1655)
4.5V to 30V Input Range
99% Duty Cycle for Lower Dropout
170µA Quiescent Supply Current
3µA Logic-Controlled Shutdown
Dual, N-Channel, Synchronous-Rectified Control
Fixed 150kHz/300kHz PWM Switching, or Synchronized from 190kHz to 340kHz
Programmable Soft Start
Low-Cost Secondary Outputs (MAX1652/MAX1654)
Synchronous rectifier, secondary output regulation, high efficiency over full I_OUT range

The MAX1652-MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).

The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode™ synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.

All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.

The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.

The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.

Applications

Cell Phones
Distributed Power
Handheld Computers
Handy Terminals
Mobile Communications
Notebook Computers
PDAs

Part Models: 4
1ku List Price: Starting From $4.81

Documentation

Data Sheet 1

MAX1652-MAX1655: High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP Data Sheet (Rev.1) 07/01/1998

Reliability Data 1

MAX1655 Reliability Data 01/12/2023

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
MAX1655EEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1655EEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1655ESE+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1655ESE+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 24, 2019 - 1746N ASSEMBLY
		pcn_1746n
MAX1655EEE+	PRODUCTION
MAX1655EEE+T	PRODUCTION
Aug 18, 2021 - 1702RN ASSEMBLY
		pcn_1702rn
MAX1655ESE+	PRODUCTION
MAX1655ESE+T	PRODUCTION

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

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX1653, MAX1655

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Features and Benefits

+4.5V to +28V Input Voltage Range
Selectable +3.3V or +5V Output Voltage
+2.5V to +5.5V Adjustable Output (MAX1653)
+1.0V to +5.5V Adjustable Output (MAX1655)
2A Output Current
3µA IC Shutdown Current
300kHz Switching Frequency
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1653 evaluation kit (EV kit) provides a +3.3V output voltage from a +4.5V to +28V input. It delivers up to 2A output current with greater than 95% efficiency, operates at 300kHz switching frequency, and has superior line- and load-transient response.

This EV kit can be used to evaluate other output voltages in the +2.5V to +5.5V range by changing feedback resistors R2 and R3. It can also be used to evaluate the MAX1655, which has a +1.0V to +5.5V output voltage range.