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MAX20457ATIB/VY offers two automotive grade synchronous buck converters with fixed frequency of either 2.1MHz or 400kHz. The two high-voltage synchronous step-down converters operate 180° out-of-phase. The IC operates with an input voltage supply from 3.5V to 36V and can operate in dropout conditions by running at 95% duty cycle.It is intended for applications with mid- to highpower requirements that operate at a wide input voltage range such as during automotive cold-crank or engine stop-start conditions.

Features

Meets Stringent OEM Module Power Consumption and Performance Specifications

10μA Supply Current with 5V Buck On

8μA Supply Current with 3.3V Buck On

10μA Supply Current with Both Bucks On

Enables Crank-Ready Designs

Wide Input Supply Range from 3.5V to 36V

EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input Voltage Range

20ns (typ) Minimum On-Time Guarantees SkipFree Operation for 3.3V Output at 2.1MHz

Spread-Spectrum Option

Phase-Locked Loop (PLL) Frequency Synchronization

Integration and Thermally Enhanced Packages Save Board Space and Cost

Two 2.1MHz Current-Mode Converters with Forced Fixed Frequency and Skip Modes

Thermally Enhanced 5mm x 5mm, 28-Pin TQFNEP Package

Protection Features Improve System Reliability

Supply Undervoltage Lockout

Overtemperature and Short-Circuit Protection

Applications

Automotive Start-Stop System

Instrument Cluster

Distributed DC Power Systems

Navigation and Radio Head Units

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