MAX1957
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MAX1957

Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.35
Features
  • Low-Cost Current-Mode Controllers
  • Fixed-Frequency PWM
  • MAX1953
    • 1MHz Switching Frequency
    • Small Component Size, Low Cost
    • Adjustable Current Limit
  • MAX1954
    • 3V to 13.2V Input Voltage
    • 25A Output Current Capability
    • 93% Efficiency
    • 300kHz Switching Frequency
  • MAX1957
    • Tracking 0.4V to 0.86VIN Output Voltage Range Sinking and Sourcing Capability of 3A
  • Shutdown Feature
  • All N-Channel MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Internal Digital Soft-Start
  • Thermal Overload Protection
  • Small 10-Pin µMAX Package
Additional Details
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The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are targeted for applications where cost and size are critical.

The MAX1953 operates at a fixed 1MHz switching frequency, thus significantly reducing external component size and cost. Additionally, excellent transient response is obtained using less output capacitance. The MAX1953 operates from low 3V to 5.5V input voltage and can supply up to 10A of output current. Selectable current limit is provided to tailor to the external MOSFETs' on-resistance for optimum cost and performance. The output voltage is adjustable from 0.8V to 0.86VIN.

With the MAX1954, the drain-voltage range on the high- side FET is 3V to 13.2V and is independent of the supply voltage. It operates at a fixed 300kHz switching frequency and can be used to provide up to 25A of output current with high efficiency. The output voltage is adjustable from 0.8V to 0.86VHSD.

The MAX1957 features a tracking output voltage range of 0.4V to 0.86VIN and is capable of sourcing or sinking current for applications such as DDR bus termination and PowerPC®/ASIC/DSP core supplies. The MAX1957 operates from a 3V to 5.5V input voltage and at a fixed 300kHz switching frequency.

The MAX1953/MAX1954/MAX1957 provide a COMP pin that can be pulled low to shut down the converter in addition to providing compensation to the error amplifier. An input undervoltage lockout (UVLO) is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current. The MAX1953/MAX1954/MAX1957 are available in tiny 10-pin µMAX packages.

Applications

  • Graphic Cards and Video Cards
  • Low-Voltage Distributed Power
  • Microprocessor Core Supplies
  • PCs and Servers
  • Printers and Scanners
  • Telecommunications and Networking
Part Models 2
1ku List Price Starting From $2.35

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX1957EUB+
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MAX1957EUB+T
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1953EVKIT

Evaluation Kit for the MAX1953/MAX1954

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MAX1953EVKIT

Evaluation Kit for the MAX1953/MAX1954

Evaluation Kit for the MAX1953/MAX1954

Features and Benefits

  • Low-Cost Current-Mode Controllers
  • Fixed-Frequency Pulse-Width Modulation (PWM)
  • 0.8V (min) Output Voltage
  • Operates from Low 3V Input Voltage
  • MAX1953
    1MHz Switching Frequency
    Small Component Size, Low Cost
    Adjustable Current Limit
  • MAX1954
    3V to 13.2V Input Voltage
    93% Efficiency
    300kHz Switching Frequency
  • Shutdown Feature
  • All n-Channel MOSFET Design for Low Cost
  • No Current-Sense Resistor Needed
  • Internal Digital Soft-Start
  • Surface-Mount Components
  • Thermal-Overload Protection
  • Small 10-Pin µMAX® Package
  • MAX1953/MAX1954 Circuit Fully Assembled and Tested
  • Product Detail

    The MAX1953 evaluation kit (EV kit) demonstrates two low-cost, buck-controller application circuits. The MAX1953 application circuit features an adjustable current limit. The 1MHz switching frequency renders a small footprint. The MAX1954 application circuit operates from a 3V to 13.2V input voltage range and is adjustable independent of the supply voltage. The MAX1954 switches at 300kHz and boasts 93% efficiency with the supplied components.

    This EV kit comes with the MAX1953 and MAX1954 evaluation circuits fully assembled and tested.

    Applications

    • Graphic Cards and Video Cards
    • Low-Voltage Distributed Power
    • Microprocessor Core Supplies
    • PCs and Servers
    • Printers and Scanners
    • Telecommunications and Networking

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