ENGLISH 简体中文 日本語 한국어  

    Login | Register 


   
 
Enter keywords or part number    



MAX1774
Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover

Dual-Output Step-Down DC-DC Converter Supplies PDA/Palmtop Computers with Automatic Battery Switchover


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Data Sheet
FULL DATA SHEET (PDF, 576kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail


Description
The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package.

The MAX1774 accepts inputs from +2.7V to +28V and provides an adjustable main output from 1.25V to 5.5V atover 2A. The secondary core converter delivers an adjustable voltage from 1V to 5V and can deliver up to 1.5A. Both the main and core regulators have separate shutdown inputs.

When the AC adapter power is removed, an external P-channel MOSFET switches input to the main battery. When the main battery is low, the backup step-up converter sustains the main output voltage. When the backup battery can no longer deliver the required load, the system shuts down safely to prevent damage. Four on-board voltage detectors monitor the status of the AC adapter power, main battery, and backup battery.

The MAX1774 evaluation kit is available to help reduce design time.

Key Features   Applications/Uses
  • Dual, High-Efficiency, Synchronous-Rectified Step-Down Converters
  • Thin, Small (1mm High) QFN Package
  • Step-Up Converter for Backup Battery
  • 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 91% Efficiency
  • Automatic Main Battery Switchover
  • 100% (max) Duty Cycle
  • Up to 1.25MHz Switching Frequency
  • Input Voltage Range from +2.7V to +28V
  • Four Low-Voltage Detectors
  • 170µA Quiescent Current
  • 8µA Shutdown Current
  • Digital Soft-Start
  • Independent Shutdown Inputs

 
  • Handheld Computers
  • Internet Access Tablets
  • PDAs
  • POS Terminals
  • Subnotebooks

    Key Specifications:   Multifunction PMICs
    Part Number Primary Topology Monitor/Control Features DC-DC/Power Features Battery Charger Features VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) IOUT (A) IOUT (A) Operating Freq. (kHz) Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX1774  Step-Down Shutdown Current Limit
    Fixed Freq./PWM
    Soft Start
    Sync. Rectifier
    Battery Backup 2.7 28 1 5.5 2 2 600 QSOP/28 62 $4.02 @ 1k
    See All Multifunction PMICs (79)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Application Notes
  • Application Note 2018: Protection From Blackouts: Dirt Cheap to Fully Integrated - MAX1774
  • Application Note 2767: DAC Makes Controller Programmable - MAX1774

    Evaluation Kits
  • MAX1774EVKIT

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-5 of 5

    MAX1774 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1774EMJ  


    Land Pattern: Not Available

    See data sheet
    MAX1774EEI  
    QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1774EEI-T  
    QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28-1*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1774EEI+  
    QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1774EEI+T  
    QSOP;28 pin;62 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0173 (PDF)
    Use pkgcode/variation: E28+1*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Related Products
    MAX1775 Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

    Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help
  •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

     Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

     Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

     Related Products 
     Notes and Comments 
     Evaluation Kits 

    Document Ref.: 19-1810; Rev 2; 2004-02-10
    This page last modified: 2007-07-24


            •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products