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

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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 2
IOUT1 (A) (max) 0.25
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
Package/Pins SOT23/5
Budgetary
Price (See Notes)
2.11
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 2
IOUT1 (A) (max) 0.25
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
Package/Pins SOT23/5
Budgetary
Price (See Notes)
2.11

Key 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

Applications/Uses

  • 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)

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.

Simplified Block Diagram

MAX1733, MAX1734: Typical Operating Circuit MAX1733, MAX1734: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.