MAX20403
RECOMMENDED FOR NEW DESIGNSAutomotive 36V, 2.5A/3.5A, Fully Integrated Synchronous Silent Switcher Buck Converters
High-Efficiency, Low-EMI, Synchronous Buck Converter for Automotive Off-Battery Applications
- Part Models
- 6
- 1ku List Price
- Starting From $1.74
Overview
- 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
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
Documentation
Video 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX20403AFLA/VY+ | LFCSP | ||
| MAX20403AFLA/VY+T | LFCSP | ||
| MAX20403AFLB/VY+ | LFCSP | ||
| MAX20403AFLB/VY+T | LFCSP | ||
| MAX20403AFLE/VY+ | LFCSP | ||
| MAX20403AFLE/VY+T | LFCSP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 27, 2025 - 2426A MECHANICAL DATASHEET |
||
| MAX20403AFLA/VY+ | PRODUCTION | |
| MAX20403AFLA/VY+T | PRODUCTION | |
| MAX20403AFLB/VY+ | PRODUCTION | |
| MAX20403AFLB/VY+T | PRODUCTION | |
| MAX20403AFLE/VY+ | PRODUCTION | |
| MAX20403AFLE/VY+T | PRODUCTION | |
|
Apr 27, 2024 - 2400 ASSEMBLY |
||
| MAX20403AFLA/VY+ | PRODUCTION | |
| MAX20403AFLA/VY+T | PRODUCTION | |
| MAX20403AFLB/VY+ | PRODUCTION | |
| MAX20403AFLB/VY+T | PRODUCTION | |
| MAX20403AFLE/VY+ | PRODUCTION | |
| MAX20403AFLE/VY+T | PRODUCTION | |
|
Feb 14, 2025 - 2458 PIN/ERRATA |
||
| MAX20403AFLE/VY+ | PRODUCTION | |
| MAX20403AFLE/VY+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT8615 | RECOMMENDED FOR NEW DESIGNS | 42V, 3.5A Synchronous Step-down Regulator with 2.5μA Quiescent Current |
| MAX42402 | RECOMMENDED FOR NEW DESIGNS | 36V, 2.5A/3.5A, Fully Integrated Synchronous Buck Converter |
| MAX42403 | RECOMMENDED FOR NEW DESIGNS | 36V, 2.5A/3.5A, Fully Integrated Synchronous Buck Converter |
Tools & Simulations
ADI Power Studio™ Designer
ADI Power Studio™ Designer is the next-generation tool for IC-level, power supply design, guiding engineers to faster, validated solutions.
Learn MoreSIMPLIS Models 1
Evaluation Kits
Evaluation Kit for the MAX20402/MAX20403
Resources
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