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Automotive 36V, 2.5A/3.5A, Fully Integrated Synchronous Buck Converters

High-Efficiency, Low-EMI, Synchronous Buck Converter for Automotive Off-Battery Applications

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • Multiple Functions for Small Size
    • Operating Input Voltage Range: 3V to 36V
    • Synchronous DC-DC Converter with Integrated FETs up to 2.5A/3.5A
    • 10μA Quiescent Current in Skip Mode
    • 3MHz/2.1MHz/400kHz Switching Frequency
    • Spread-Spectrum Option
    • Fixed 2.5ms Internal Soft-Start
    • Programmable 0.8V to 12V Output Voltage Range or Fixed 5V/3.3V Options Available
    • 99% Duty Cycle Operation with Low Dropout
  • High Precision for Safety Critical Applications
    • ±1.5% Output Voltage Accuracy in FPWM
    • Precision Enable Thresholds for Fully Programmable UVLO Thresholds
    • Accurate Windowed PGOOD
  • Robust for the Automotive Environment
    • Average Current Mode, Forced-PWM, and Skip Operation
    • Overtemperature, Overvoltage, and Short-Circuit Protection
    • 3mm x 3mm FC2QFN
    • -40°C to +125°C Operating Temperature Range
    • 42V Load-Dump Tolerant
    • AEC-Q100 Qualified

Applications/Uses

  • Automotive Applications
  • ADAS Systems
  • Radar Modules
  • Infotainment
  • Industrial Applications
  • High-Voltage DC-DC Converters

Description

The MAX20402/MAX20403 IC are tiny synchronous buck converters with integrated high-side and low-side switches. The MAX20402/MAX20403 deliver up to 2.5A/3.5A over a wide 3V to 36V input voltage range. Voltage quality can be monitored by observing the PGOOD signal. These ICs can operate in dropout by running at 99% duty cycle, making them ideal for automotive and industrial applications.

The MAX20402/MAX20403 offer externally programmable or internally fixed output voltages of 5V and 3.3V. Fixed internal frequency options of 3MHz/2.1MHz/400kHz are available, which allow for small external components and reduced output ripple, and also guarantee no AM interference.

When SYNC is low, the MAX20402/MAX20403 automatically enter skip mode at light loads with an ultra-low quiescent current of 10μA at no load. A pin-selectable forced-PWM mode is also available, which helps improve EMI performance. The devices have a spread-spectrum frequency modulation option designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX20402/MAX20403 are available in a small, 3mm x 3mm FC2QFN package and use very few external components.

Simplified Block Diagram

MAX20402, MAX20403: Simplified Block Diagram MAX20402, MAX20403: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.