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Maxim > Products > [Power and Battery Management] 
MAX1920, MAX1921
Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 804kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1920/MAX1921 step-down converters deliver over 400mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (50µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination makes the MAX1920/MAX1921 excellent high-efficiency alternatives to linear regulators in space-constrained applications.

Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.

The MAX1920 provides an adjustable output voltage (1.25V to 4V). The MAX1921 provides factory-preset output voltages (see the Selector Guide). Both are available in space-saving 6-pin SOT23 packages. The MAX1920 is also available in a 6-pin TDFN package.

An evaluation kit is available:  MAX1921EVKIT  

Key Features   Applications/Uses
  		• 400mA Guaranteed Output Current
  		• Internal Synchronous Rectifier for >90% Efficiency
  		• Tiny 6-Pin SOT23 Package
  		• Up to 1.2MHz Switching Frequency for Small External Components
  		• 50µA Quiescent Supply Current
  		• 0.1µA Logic-Controlled Shutdown
  		• 2V to 5.5V Input Range
  		• Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output Voltages (MAX1921)
  		• Adjustable Output Voltage (MAX1920)
  		• ±1.5% Initial Accuracy
  		• Soft-Start Limits Startup Current

    		  
  		• Battery-Powered Applications
  		• CDMA Power Amplifier Supply
  		• Next-Generation Wireless handsets
  		• PDAs, Palmtops, and Handy Terminals

    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
    MAX1920  2 5.5 1.25 4 - 0.4 0.4 Resistor 1 1200
    SOT/6
    TDFN-EP/6
    		 9 $1.35 @1k
    MAX1921  1.5 3.3
    1.5
    1.8
    2.5
    3
    3.3
    Preset
    Resistor
    SOT/6
    		 $1.35 @1k
    See All Step-Down Switching Regulators (264)

    Diagram
    MAX1920, MAX1921: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1921EVKIT

    Reliability Reports
  		• Reliability Report: MAX1920.pdf MAX1921.pdf
  		• Show FIT data 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: 1-22 of 22

    MAX1920 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1920EUT+  
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1920EUT-T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1920EUT+T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1920ETT+  
    		Active TDFN-EP;6 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1920ETT+T    
    		Active TDFN-EP;6 pin;10 mm²
    Outline Drawing: 21-0137 (PDF)
    Land Pattern: 90-0058 (PDF)
    Use pkgcode/variation: T633+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1921EUT33+T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT30+  
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT30+T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT15+  
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT15+T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT33+  
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT18+  
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT18+T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT18    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT25+  
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1921EUT30    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT15-T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT18-T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT25-T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT30-T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT33-T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1921EUT25+T    
    		Active SOT;6 pin;9 mm²
    Outline Drawing: 21-0058 (PDF)
    Land Pattern: 90-0175 (PDF)
    Use pkgcode/variation: U6SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX1920 MAX1921
  		• New Product Press Release 2002-02-26 

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    Document Ref.: 19-2296; Rev 3; 2005-09-20
    This page last modified: 2007-07-05


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