MAX8643A
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MAX8643A

3A, 2MHz Step-Down Regulator with Integrated Switches

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Smallest, Most-Efficient 3A Step-Down Regulator Up to a 2.4MHz Frequency

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $4.27
Features
  • Internal 37mΩ RDSON MOSFETs
  • Continuous 3A Output Current
  • ±1% Output Accuracy Over Load, Line, and Temperature
  • Operates from 2.35V to 3.6V Supply
  • Adjustable Output from 0.6V to (0.9 x VIN)
  • Soft-Start Reduces Inrush Supply Current
  • 500kHz to 2MHz Adjustable Switching Frequency
  • Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors
  • VID-Selectable Output Voltages
    • 0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V
  • Fully Protected Against Overcurrent and Overtemperature
  • Safe-Start into Prebiased Output
  • Sink/Source Current in DDR Applications
  • Lead-Free, 24-Pin, 4mm x 4mm Thin QFN Package
Additional Details
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The MAX8643A high-efficiency switching regulator delivers up to 3A load current at output voltages from 0.6V to (0.9 x VIN). The IC operates from 2.35V to 3.6V, making it ideal for on-board point-of-load and postregulation applications. Total output error is less than ±1% over load, line, and temperature.

The MAX8643A features fixed-frequency PWM mode operation with a switching frequency range of 500kHz to 2MHz set by an external resistor. High-frequency operation allows for an all ceramic capacitor design. The high operating frequency also allows for small-size external components.

The low-resistance on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs.

The MAX8643A comes with a high-bandwidth (> 14MHz) voltage-error amplifier. The voltage-mode control architecture and the voltage-error amplifier permit a type III compensation scheme to be utilized to achieve maximum loop bandwidth, up to 20% of the switching frequency. High loop bandwidth provides fast transient response, resulting in less required output capacitance and allowing for all-ceramic capacitor designs.

The MAX8643A provides two three-state logic inputs to select one of nine preset output voltages. The preset output voltages allow customers to achieve ±1% output-voltage accuracy without using expensive 0.1% resistors. In addition, the output voltage can be set to any customer value by either using two external resistors at the feedback with 0.6V internal reference or applying an external reference voltage to the REFIN input. The MAX8643A offers programmable soft-start time using one capacitor to reduce input inrush current. The MAX8643A is available in a lead-free, 24-pin, 4mm x 4mm thin QFN package.

Applications

  • ASIC/CPU/DSP Core and I/O Voltages
  • Base-Station Power Supplies
  • DDR Power Supplies
  • POLs
  • RAID Control Power Supplies
  • Telecom and Networking Power Supplies
Part Models 4
1ku List Price Starting From $4.27

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Product Lifecycle

PCN

Mar 9, 2023

- 2276A

WAFER FAB

MAX8643AETG+

PRODUCTION

MAX8643AETG+T

PRODUCTION

Jun 20, 2016

- 1612

ASSEMBLY

MAX8643AETG+

PRODUCTION

MAX8643AETG+T

PRODUCTION

Apr 3, 2023

- 2276B

WAFER FAB

MAX8643AETG/V+

PRODUCTION

MAX8643AETG/V+T

PRODUCTION

Jan 30, 2018

- 1721C

ASSEMBLY

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Filter by Model

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Part Models

Product Lifecycle

PCN

Mar 9, 2023

- 2276A

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WAFER FAB

MAX8643AETG+

PRODUCTION

MAX8643AETG+T

PRODUCTION

Jun 20, 2016

- 1612

arrow down

ASSEMBLY

MAX8643AETG+

PRODUCTION

MAX8643AETG+T

PRODUCTION

Apr 3, 2023

- 2276B

arrow down

WAFER FAB

MAX8643AETG/V+

PRODUCTION

MAX8643AETG/V+T

PRODUCTION

Jan 30, 2018

- 1721C

arrow down

ASSEMBLY

MAX8643AETG/V+T

PRODUCTION

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