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Maxim > Products > Power and Battery Management 
MAX756, MAX757
3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters

For New Designs, We Recommend Improved Performance Devices, MAX1674/MAX1675/MAX1676


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Data Sheet
FULL DATA SHEET (PDF, 120kB)
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Description
The MAX756/MAX757 are CMOS step-up DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin-selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2.7V to 5.5V. Typical full-load efficiencies for the MAX756/MAX757 are greater than 87%.

The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.

Key Features   Applications/Uses
  • Operates Down to 0.7V Input Supply Voltage
  • 87% Efficiency at 200mA
  • 60µA Quiescent Current
  • 20µA Shutdown Mode with Active Reference and LBI Detector
  • 500kHz Maximum Switching Frequency
  • ±1.5% Reference Tolerance Over Temperature
  • Low-Battery Detector (LBI/LBO)
  • 8-Pin DIP and SO Packages

 
  		• 2-Cell and 3-Cell Battery-Operated Equipment
  		• 3.3V to 5V Step-Up Conversion
  		• Glucose Meters
  		• Medical Instrumentation
  		• Palmtop Computers
  		• Personal Data Communicators/Computers
  		• Portable Data-Collection Equipment

    Diagram
    MAX756, MAX757: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 1049: Supply Circuitry Selects Main/Backup Voltage and Disconnects - MAX756
  		• Application Note 1177: Power-Boost Circuit Powers Cellular Handset - MAX757

    Evaluation Kits
  		• MAX756EVKIT

    Design Guides
  		• TEMP SENSORS (PDF)
  		• LOW-POWER NOTEBOOK ICs (PDF)
  		• WIRELESS (PDF)

    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: 1-24 of 24

    MAX756 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX756C/D  
    		DICE SALES;0 pin;

    Use pkgcode/variation: DICE*
    		See data sheet
    MAX756EPA+  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043
    Use pkgcode/variation: P8+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX756CPA+  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043
    Use pkgcode/variation: P8+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX756CPA  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX756EPA  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043
    Use pkgcode/variation: P8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX756CSA  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX756CSA+T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX756CSA+  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX756CSA-T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX756ESA+T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX756ESA+  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX756ESA-T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX756ESA  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX757 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX757C/D  
    		DICE SALES;0 pin;

    Use pkgcode/variation: DICE*
    		See data sheet
    MAX757CPA  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX757EPA  
    		PDIP;8 pin;82 mm²
    Dwg: 21-0043
    Use pkgcode/variation: P8-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX757CSA-T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX757CSA  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX757CSA+T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX757CSA+  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX757ESA+T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX757ESA+  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX757ESA-T  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX757ESA  
    		SOIC;8 pin;31 mm²
    Dwg: 21-0041B (PDF)
    Use pkgcode/variation: S8-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    Related Products
    MAX1674, MAX1675, MAX1676 High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters

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     Description 
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    Document Ref.: 19-0113; Rev 2; 1995-01-01
    This page last modified: 2007-05-30




             


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