MAX42403

RECOMMENDED FOR NEW DESIGNS

36V, 2.5A/3.5A, Fully Integrated Synchronous Buck Converter

Analog Devices MAX42403 Product Info

10 February 2026 5

Features

Multiple Functions for Small Size
- Operating Input Voltage Range: 4.5V to 36V
- Synchronous DC-DC Converter with Integrated FETs up to 2.5A/3.5A
- 27μA Quiescent Current in Skip Mode
- 1.5MHz/400kHz Switching Frequency
- Spread-Spectrum Option
- Internal Soft-Start
  - 2.5ms for 400kHz
  - 3.5ms for 1.5MHz
- Programmable Output Voltage
  - 0.8V to 14V for 400kHz
  - 0.8V to 12V for 1.5MHz
- 99% Duty Cycle Operation with Low Dropout

High Precision for Safety-Critical Applications
- Precision Enable Thresholds for Fully Programmable UVLO Thresholds
- Accurate Windowed PGOOD
Forced-PWM and Skip Operation
Overtemperature, Overvoltage, and Short-Circuit Protection
3mm x 3mm FC2QFN
-40°C to +125°C Operating Temperature Range

Part details & applications

The MAX42402/MAX42403 IC are a tiny synchronous buck converter with integrated high-side and low-side switches. The MAX42402/MAX42403 are designed to deliver up to 2.5A/3.5A with a wide, 4.5V to 36V input voltage range. Voltage quality can be monitored by observing the PGOOD signal. The IC can operate in dropout by running at 99% duty cycle, making it ideal for industrial applications.

The MAX42402/MAX42403 offer externally programmable output voltage. Fixed internal frequency options of 1.5MHz/400kHz are available, which allow for small external components and reduced output ripple.

When SYNC is low, the MAX42402/MAX42403 automatically enter skip mode at light loads with an ultra-low quiescent current of 27uA at no load. A pin-selectable forced-PWM mode is also available, which helps to improve EMI performance. The devices have a spread-spectrum frequency modulation option designed to minimize EMI-radiated emissions due to the modulation frequency.

The MAX42402/MAX42403 are available in a small, 3mm x 3mm FC2QFN package and uses very few external components.

Applications

Industrial Automation
Point-of-Load
Distributed DC Power Systems

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