MAX1644

PRODUCTION

2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Industry's Smallest 2A DC-DC with Synchronous Rectifier

Part Models
2
1ku List Price
Starting From $5.77
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Part Details

  • ±1% Output Accuracy
  • 95% Efficiency
  • Internal PMOS and NMOS Switches
    • 70mΩ On-Resistance at VIN = +4.5V
    • 100mΩ On-Resistance at VIN = +3V
  • Output Voltage
    • +3.3V or +2.5V Pin-Selectable
    • +1.1V to VIN Adjustable
  • +3V to +5.5V Input Voltage Range
  • 360µA (max) Operating Supply Current
  • < 1µA Shutdown Supply Current
  • Programmable Constant-Off-Time Operation
  • 350kHz (max) Switching Frequency
  • Idle Mode Operation at Light Loads
  • Thermal Shutdown
  • Adjustable Soft-Start Inrush Current Limiting
  • 100% Duty Cycle During Low-Dropout Operation
  • Output Short-Circuit Protection
  • 16-Pin SSOP Package
MAX1644
2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
MAX1644: Typical Operating Circuit
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Documentation

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Hardware Ecosystem

Parts Product Life Cycle Description
Internal Power Switch Buck Regulators 1
MAX1623 PRODUCTION 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
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Evaluation Kits

MAX1644EVKIT

Evaluation Kit for the MAX1644

Features and Benefits

  • +3V to +5.5V Input Voltage Range
  • Output Voltage Preset to 1.5V
    • 2.5V or 3.3V Selectable
    • 1.1V to VIN Adjustable
  • 2A Output Current
  • 92% Efficiency
  • 300kHz Switching Frequency
  • Synchronous Rectification for Improved Efficiency
  • No External Schottky Diode Required
  • Less than 1µA typical IC Shutdown Current
  • Surface-Mount Construction
  • Fully Assembled and Tested

Product Details

The MAX1644 evaluation kit (EV kit) provides a 1.5V output voltage from a +3V to +5.5V input source. It delivers up to 2A output current with 92% (max) efficiency. The MAX1644 is a step-down switching regulator with an internal synchronous rectifier to reduce the number of external components. It features a resistor-programmable fixed off-time as well as current-mode operation for superior load- and line-transient response.

The MAX1644 EV kit can also be used to evaluate other output voltages by changing the feedback resistors (R1 and R2) or by using the preset +3.3V or +2.5V settings.

Applications

  • +3.3V PC Card and CardBus Applications
  • +5V to +3.3V/+2.5V Conversion
  • CPU Daughter Card Supply
  • CPU I/O Supplies
  • Desktop Bus-Termination Boards
  • Notebook and Subnotebook Computers

MAX1644EVKIT
Evaluation Kit for the MAX1644

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