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Maxim > Products > Power and Battery Management 
MAX1733, MAX1734
Low-Voltage, Step-Down DC-DC Converters in SOT23

High-Efficiency DC-DC Solution for Low-Voltage Logic Supplies


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Data Sheet
FULL DATA SHEET (PDF, 280kB)
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Description
The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA 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 (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 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 MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.

Key Features   Applications/Uses
  • 250mA Guaranteed Output Current
  • Synchronous Rectifier for Over 90% Efficiency
  • Tiny 5-Pin SOT23 Package
  • 40µA Quiescent Supply Current
  • 0.01µA Logic-Controlled Shutdown
  • Up to 1.2MHz Switching Frequency
  • Fixed 1.8V or 1.5V Outputs (MAX1734)
  • Adjustable Output Voltage (MAX1733)
  • ±1.5% Initial Accuracy
  • 2.7V to 5.5V Input Range
  • Soft-Start Limits Startup Current

 
  		• Cell Phones
  		• Computers: Desktop, Workstation, Server
  		• Consumer Audio
  		• Digital Still Cameras
  		• Global Positioning Systems (GPS)
  		• Palmtop Computers
  		• POS Terminals
  		• Wireless Data
  		• Wireless Local Area Networks (WLANs)

    Key Specifications:   Step-Down Switching Regulators
    Part Number VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) Preset VOUT (V) IOUT (A) Output Adj. Method Operating Current, ICC (max) (mA) Number of DC-DC Outputs Operating Freq. (kHz) Features EV-Kit Package RoHS Available Operating Temp. Range (°C) Price**
    MAX1733  2.7 5.5 1.25 2  -  0.25 Resistor 0.07 1 1200
    •Adjustable Frequency
    •Current Limit
    •Internal Power Switches
    •Shutdown
    •Soft Start
    •Synchronous Rectifier
    		 Yes SOT-23/5 Yes -40 to +85 $1.89 @ 1k
    MAX1734  1.5 1.8 1.5
    1.8     		Preset
    Resistor     		$1.89 @ 1k
    See All Step-Down Switching Regulators (223)

    Key Specifications:   Switch-Mode DC-DC Power Supplies
    Part Number Topology VIN (min) (V) VIN (max) (V) Number of DC-DC Outputs Preset VOUT (V) Digital/VID Programmed Output Min. Adjustable VOUT (V) Max. Adjustable VOUT (V) IOUT (A) Operating Current, ICC (max) (mA) Operating Freq. (kHz) Internal Power Switch(es) Package Price**
    MAX1733  Step-Down 2.7 5.5 1  -  No 1.25 2 0.25 0.07 1200 Yes SOT-23/5 $1.89 @ 1k
    MAX1734  1.5
    1.8     		 -   -  $1.89 @ 1k
    See All Switch-Mode DC-DC Power Supplies (429)
    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.

    Diagram
    MAX1733, MAX1734: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 1121: Using Ceramic Output Capacitors with the MAX1734 Voltage-Mode Buck Converter - MAX1734
  		• Application Note 1157: Parallel-Port Interface Powers Low Voltage Systems - MAX1733
  		• Application Note 3200: Buck Regulator Generates Ultra-Low Output Voltage - MAX1733

    Evaluation Kits
  		• MAX1734EVKIT

    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: 1-13 of 13

    MAX1733 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1733EUK-TG05  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1733EUK  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1733EUK+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1733EUK-T  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1733EUK+T  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1734 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1734EUK18+T  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1734EUK18+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1734EUK15+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1734EUK15  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1734EUK18  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1734EUK18-T  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1734EUK15-T  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1734EUK15+T  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Related Products
    MAX1692 Low-Noise, 5.5V Input, PWM Step-Down Regulator

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    Document Ref.: 19-1586; Rev 0; 2000-09-15
    This page last modified: 2007-06-06




             


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