MAX1733

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

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


Please check latest availability status for a specific part variant.

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.
MAX1733, MAX1734: Typical Operating Circuit MAX1733, MAX1734: Typical Operating Circuit Enlarge+

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)
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1733 2.75.51.252-Resistor0.25InternalYes11200
SOT23/5
$1.99 @1k
MAX1734 1.51.8
1.5
1.8
Preset
Resistor
SOT23/5
See All Step-Down Switching Regulators (402)
Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1734EVKIT: Evaluation Kit for the MAX1733, MAX1734

Technical Documents

App Note 3200 Buck Regulator Generates Ultra-Low Output Voltage
App Note 1157 Parallel-Port Interface Powers Low Voltage Systems

Quality and Environmental Data

Request Reliability Report for: MAX1733 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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