MAX1954A
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MAX1954A

Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $1.82
Features
  • Current-Mode Controller
  • Fixed-Frequency PWM
  • Foldback Current Limit
  • Output Down to 0.8V with ±1% FB Accuracy
  • 3.0V to 13.2V Input Voltage
  • 300kHz Switching Frequency
  • 25A Output-Current Capability
  • 93% Efficiency
  • All-N-Channel-MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Internal Digital Soft-Start
  • Small 10-Pin µMAX Package
Additional Details
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The MAX1954A synchronous current-mode, pulse-width modulation (PWM) buck controller is pin compatible with the popular MAX1954 and is suitable for applications where cost and size are critical.

The MAX1954A operates from an input voltage range of 3.0V to 13.2V, independent of the IC supply. The output voltage is adjustable down to 0.8V. The IC operates at a fixed 300kHz switching frequency and provides up to 25A of output current with efficiency up to 95%. This controller has excellent transient response resulting in smaller output capacitance.

The MAX1954A features foldback current limiting that greatly reduces input current and component power dissipation during output overload or short-circuit conditions.

The compensation and shutdown control (COMP) input, in addition to providing compensation to the error amplifier, can be pulled low to shut down the converter. An input undervoltage lockout is provided to ensure proper operation during power sags to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current and save an external capacitor.

The MAX1954A is available in a tiny 10-pin µMAX® package to minimize PC board space.

Applications

  • Graphic Cards and Video Cards
  • Low-Voltage Distributed Power
  • Microprocessor Cores
  • PCs and Servers
  • Printers and Scanners
  • Telecom/Networks
Part Models 2
1ku List Price Starting From $1.82

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Nov 26, 2018

- 1753A

ASSEMBLY

MAX1954AEUB+

PRODUCTION

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PRODUCTION

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Part Models

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PCN

Nov 26, 2018

- 1753A

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ASSEMBLY

MAX1954AEUB+

PRODUCTION

MAX1954AEUB+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1954AEVKIT

Evaluation Kit for the MAX1954A

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MAX1954AEVKIT

Evaluation Kit for the MAX1954A

Evaluation Kit for the MAX1954A

Features and Benefits

  • Current-Mode Controller
  • 300kHz Fixed-Frequency PWM
  • 0.8V Minimum Output Voltage
  • 10.8V to 13.2V Input Voltage Range
  • >90% Efficiency
  • Output Shutdown Mode
  • All n-Channel MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Foldback Short-Circuit Protection
  • Thermal-Overload Protection
  • Small 10-Pin µMAX® Package
  • Assembled and Tested
  • Product Detail

    The MAX1954A evaluation kit (EV kit) demonstrates the MAX1954A buck controller application circuit. The EV kit generates a 1.5V output voltage at load currents up to 5A from a 10.8V to 13.2V input voltage range independent of the IC supply voltage. The MAX1954A switches at 300kHz and has better than 90% efficiency with the supplied components.

    The EV kit comes fully assembled and tested.

    Applications

    • Graphic Cards and Video Cards
    • Low-Voltage Distributed Power
    • Microprocessor Cores
    • PCs and Servers
    • Printers and Scanners
    • Telecom/Networks

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