MAX1734
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MAX1734

Low-Voltage, Step-Down DC-DC Converters in SOT23

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

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1ku List Price Starting From $2.26
Features
  • 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
Additional Details
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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.

Applications

  • 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)
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Part Models 2
1ku List Price Starting From $2.26
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MAX1734

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Data Sheet

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UPDATED 09/15/2000
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MAX1733-MAX1734: Low-Voltage, Step-Down DC-DC Converters in SOT23 Data Sheet (Rev.0)

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UPDATED 01/01/1900
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2295: 低电压、降压型DC-DC转换器，SOT23封装 Data Sheet

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UPDATED 09/15/2000
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MAX1733-MAX1734_jp: 低電圧、ステップダウンDC-DCコンバ―タ、SOT23 Data Sheet (Rev.0)

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UPDATED 06/24/2002
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Using Ceramic Output Capacitors with the MAX1734 Voltage-Mode Buck Converter redirect icon

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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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MAX1734EUK18+T 5-SOT_23-N/A external-link
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Jan 11, 2021

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Internal Power Switch Buck Regulators1
MAX1692
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Low-Noise, 5.5V Input, PWM Step-Down Regulator

Evaluation Kits 1

MAX1734EVKIT

Evaluation Kit for the MAX1733, MAX1734

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MAX1734EVKIT

Evaluation Kit for the MAX1733, MAX1734

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MAX1734EVKIT
Evaluation Kit for the MAX1733, MAX1734

Features and Benefits

  • +2.7V to +5.5V Battery Input Voltage
  • +1.8V Output Voltage
  • 250mA Output Current
  • Efficiency >85% from 2mA to 250mA
  • Internal P-Channel Switch and Synchronous Rectifier
  • 0.01µA (typ) IC Shutdown Current
  • 50µA Quiescent Supply Current
  • Up to 1.2MHz (max) Switching Frequency
  • Surface-Mount Components
  • Fully Assembled and Tested
    • Buy Now View Details

    Product Detail

    The MAX1734 evaluation kit (EV kit) is a fully assembled and tested surface-mount PC board that contains a switching-regulator circuit configured for a +1.8V output. At up to 250mA, it accepts inputs from a +2.7VDC to +5.5VDC source or a 1-cell lithium-ion (Li+) or 2- to 3-cell battery.

    The MAX1734 features an internal P-channel MOSFET switch, a synchronous rectifier, logic-controlled shutdown, and digital soft-start to limit startup current. The MAX1734 EV kit provides low quiescent current and efficiency up to 93%, providing maximum battery life. High-frequency operation up to 1.2MHz with a maximum duty cycle of 100% allows the use of tiny surface-mount components. The EV kit can also evaluate the MAX1733 after modifications.

    Applications

    • 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)

    Evaluation Kits1

    MAX1734EVKIT

    Evaluation Kit for the MAX1733, MAX1734

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