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Maxim > Products > [Power and Battery Management] 
MAX1762, MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 668kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1762/MAX1791 PWM step-down controllers provide high efficiency, excellent transient response, and high DC output accuracy needed for stepping down, high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in notebook computers and PDAs.

Maxim's proprietary Quick-PWM™ pulse-width modulator is a free-running constant on-time type with input feed-forward. Its high operating frequency (300kHz) allows small external components to be utilized in PC board area-critical applications such as subnotebook computers and smart phones. PWM operation occurs at heavy loads, and automatic switchover to pulse-skipping operation occurs at lighter loads. The external high-side p-channel and low-side n-channel MOSFETs require no bootstrap components. The MAX1762/MAX1791 are simple, easy to compensate, and do not have the noise sensitivity of conventional fixed-frequency current-mode PWMs.

These devices achieve high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by their ability to drive synchronous-rectifier MOSFETs. The MAX1762/MAX1791 come in a 10-pin µMAX® package and offer two fixed voltages (Dual Mode™) for each device, 1.8V/2.5V/adj (MAX1762) and 3.3V/5.0V/adj (MAX1791).

An evaluation kit is available:  MAX1791EVKIT  

Key Features   Applications/Uses
  • High Operating Frequency (300kHz)
  • No Current-Sense Resistor
  • Accurate Current Limit
  • ±1% Total DC Error over Line and During Continuous Conduction
  • Dual Mode Fixed Output
    • 1.8V/2.5V/adj (MAX1762)
    • 3.3V/5.0V/adj (MAX1791)
  • 0.5V to 5.5V Output Adjust Range
  • 5V to 20V Input Range
  • Automatic Light-Load Pulse Skipping Operation
  • Free-Running On-Demand PWM
  • Foldback Mode™ UVLO
  • PFET/NFET Synchronous Buck
  • 4.65V at 25mA Linear Regulator Output
  • 5µA Shutdown Supply Current
  • 230µA Quiescent Supply Current
  • 10-Pin µMAX Package

  
  		• 2-Way Pagers
  		• Analog Cellular Phones
  		• Digital Cellular Phones
  		• Digital Still Cameras
  		• Notebook Computers

    Key Specifications:  Step-Down Switching Regulators
    Part Number VIN
    (V)    		 VIN
    (V)    		 VOUT
    (V)    		 VOUT
    (V)    		 Preset VOUT
    (V)    		 Max. IOUT
    (A)    		 Max. IOUT
    (A)    		 Output Adjust. Method DC-DC Outputs Oper. Freq.
    (kHz)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX1762  5 20 0.5 5.5
    1.8
    2.5
    		 2 2
    Preset
    Resistor
    		 1 300
    µMAX/10
    		 15 $2.30 @1k
    MAX1791 
    3.3
    5
    µMAX/10
    		 $2.30 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX1762, MAX1791: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1791EVKIT

    Design Guides
  		• Low-Power Notebook ICs (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: 1-8 of 8

    MAX1762 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1762EUB    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1762EUB-T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1762EUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1762EUB+T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1791 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1791EUB    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1791EUB-T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1791EUB+  
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1791EUB+T    
    		Active µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2000-12-19 

    Related Products
    MAX1761 Small, Dual, High-Efficiency Buck Controller for Notebooks
    MAX1714, MAX1714A, MAX1714B High-Speed Step-Down Controller for Notebook Computers
    MAX1630, MAX1631, MAX1632, MAX1633, MAX1634, MAX1635 Multi Output, Low-Noise Power Supply Controllers for Notebook Computers

    More Like This: View Product Families for Similar Products

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    •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

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     Engineering Journals 
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    Document Ref.: 19-1923; Rev 1; 2006-05-16
    This page last modified: 2007-06-14


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