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

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

* 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