MAX1775

PRODUCTION

Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

Dual-Output Step-Down Converter For PDA's and Palmtop Computers

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.33

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Overview

Dual, High-Efficiency, Synchronous Rectified Step-Down Converter
Main Power
- Adjustable from +1.25V to +5.5V
- Over 2A Load Current
- Up to 95% Efficiency
Core Power
- Adjustable from 1V to 5V
- Internal Switches
- Up to 1.5A Load Current
- Up to 92% Efficiency
100% (max) Duty Cycle
Up to 1.25MHz Switching Frequency
Input Voltage Range from +2.7V to +28V
170µA Quiescent Current
5µA Shutdown Current
Digital Soft-Start
Independent Shutdown Inputs

The MAX1775 dual, step-down DC-DC converter generates both the main (+3.3V at over 2A) and core (+1.8V at up to 1.5A) supplies for a complete power solution for PDAs, subnotebooks, and other hand-held devices. The main output is adjustable from +1.25V to +5.5V. The core output is adjustable from 1V to 5V. Both switching converters operate at up to 1.25MHz for small external components and use synchronous rectifiers to achieve efficiencies up to 95%. Operation with up to 100% duty cycle provides the lowest possible dropout voltage to extend useful battery life.

The MAX1775 accepts inputs from +2.7V up to +28V, allowing use with many popular battery configurations as well as AC-DC wall adapters. Digital soft-start reduces battery current surges at power-up. Both the main and core converters have separate shutdown inputs. The MAX1775 comes in a small 16-pin QSOP package.

The MAX1775 evaluation kit is available to help reduce design time.

Applications

Handheld Computers
Internet Access Tablets
PDAs
POS Terminals
Subnotebooks

Part Models: 2
1ku List Price: Starting From $4.33

Documentation

Data Sheet 1

MAX1775: Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers Data Sheet (Rev.2) 01/12/2010

Reliability Data 1

MAX1775 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
MAX1775EEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1775EEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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
Battery Charger ICs 1
MAX1774	PRODUCTION	Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover

Evaluation Kits

Evaluation Kit for the MAX1775

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Features and Benefits

+2.7V to +5.5V Input Range
Output Voltages
- +3.3V Output at 1.5A
- +1.8V Output at 500mA
Outputs are Adjustable with Resistors
Internal MOSFET Switches (Core Output)
5µA (typ) IC Shutdown Current
Switching Frequency Up to 1.25MHz
Surface-Mount Components
Fully Assembled and Tested

Product Details

The MAX1775 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a dual step-down switching regulator circuit. The circuit is configured for a main output voltage of +3.3V and a core output voltage of +1.8V. The main output provides up to 1.5A, and the core provides up to 500mA of current.

Power for the circuit can be provided from a +2.7V to +5.5V DC source. The EV kit can be reconfigured for input voltages up to +28V. The core's input can be powered from the input source or, for higher input voltages, from the main output.

The MAX1775 EV kit demonstrates low quiescent current and high efficiency up to 95% for maximum battery life. Operation up to 1.25MHz allows the use of tiny surface-mount components.