MAX20403

RECOMMENDED FOR NEW DESIGNS

Automotive 36V, 2.5A/3.5A, Fully Integrated Synchronous Silent Switcher Buck Converters High-Efficiency, Low-EMI, Synchronous Buck Converter for Automotive Off-Battery Applications

Analog Devices MAX20403 Product Info

10 February 2026 5

Features

Silent Switcher
- Enables Compact, Efficient, Low-EMI Solution
- Spread-Spectrum Frequency Modulation
- Symmetrical Package Offers Superior EMIPerformance
- CISPR 25 Class 5-Compliant EV Kit
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 14V Output Voltage Range or Fixed 5V/3.3V Options Available
- 99% Duty Cycle Operation with Low Dropout
High Precision for Safety Critical Applications
- MAXQ Power Architecture
- ±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

Part details & applications

The MAX20402/MAX20403 ICs are tiny, low-EMI emission, synchronous Silent Switcher^® 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.

This device features the MAXQ^® power architecture, which provides precision transient performance and phase margin. This allows obtaining the maximum power, performance, and precision while minimizing system cost for any specific application.

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

APPLICATIONS

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

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