MAX20458ATIA/VY+ Analog Devices

EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX20458 36V Boost Controller with A 3.5A Synchronous Buck Converter for Automotive Applications General Description Benefits and Features The MAX20458 is an automotive grade PMIC that includes Meets Stringent OEM Module Power Consumption a 3.5A synchronous buck converter and an asynchronous and Performance Specifications boost controller with 2.1MHz and 400kHz options. The 10A Supply Current with 5V Buck On boost controller can be used to provide power to buck OUT Can Be Either 5V or 3.3V converters and keep them in regulation during cold-crank 30A Supply Current with All Regulators On operation down to 2V battery input. The IC operates with Enables Crank-Ready Designs an input voltage supply from 3.5V to 36V and can oper- Output Voltages in Regulation Through Cold Crank ate in dropout conditions by running at 95% duty cycle. Down to 2V Battery Voltage It is intended for applications with mid- to high-power Wide Input Supply Range from 3.5V to 36V requirements that operate at a wide input voltage range EMI Reduction Features Reduce Interference with such as during automotive cold-crank or engine stop-start Sensitive Radio Bands without Sacrificing Wide Input conditions. Voltage Range High switching frequency up to 2.1MHz allows small 20ns (typ) Minimum On-Time Guarantees external components, reduced output ripple, and guaran- Skip-Free Operation for 3.3V Output at 2.1MHz tees no AM band interference. The switching frequency is Spread-Spectrum Option fixed at 400kHz or 2.1MHz. FSYNC input programmability Phase-Locked Loop (PLL) Frequency enables three modes for optimized performance: forced Synchronization fixed-frequency operation, skip mode with ultra-low qui- Integration and Thermally Enhanced Packages Save escent current, and phase-locked synchronization to an Board Space and Cost external clock. The spread spectrum option minimizes A 2.1MHz Buck Converters with Asynchronous EMI interference. Boost Controller The IC features the power-OK indicators for buck con- Current-Mode Controller with Forced Fixed verters and undervoltage lockout for each power rail. Frequency and Skip Modes Protection features include cycle-by-cycle current limit Thermally Enhanced 5mm x 5mm, 28-Pin and thermal shutdown. The MAX20458 is specified for TQFN-EP Package operation over the -40C to +125C automotive tempera- Protection Features Improve System Reliability ture range. Supply Undervoltage Lockout Overtemperature and Short-Circuit Protection Applications Automotive Start-Stop System Instrument Cluster Distributed DC Power Systems Ordering Information appears at end of data sheet. Navigation and Radio Head Units 19-100529 Rev 0 4/19MAX20458 36V Boost Controller with A 3.5A Synchronous Buck Converter for Automotive Applications Simplified Block Diagram BUCK1 CONTROL LOGIC PGOOD1 PGOOD MAX20458 COMP THRESHOLD FB1 FEEDBACK SUPSW1 SELECT LOGIC EAMP1 BST1 INTERNAL EN1 SOFT START OUT1 BUCK1 PWM1 LX1 PWM1 GATE DRIVE CURRENT SENSE LOGIC BIAS AND SLOPE COMP LX1 EN1 CLK1 CLK1 BIAS PGND1 SPREAD SPECTRUM OSCILLATOR ON/OFF OPTION PLL/SYNC INTERNAL BIAS BIAS DETECTION LINEAR REGULATOR FSYNC FSYNC SELECT LOGIC BUF EXTVCC AGND SWITCHOVER BIAS CLK2 PGND BOOST CONTROL LOGIC EN2 UVLO EN2 SUP UVLO CLK2 BOOST PGND2 GATE DRIVE CSP CLK2 CURRENT SENSE LOGIC AND SLOPE COMP PWM2 DL PWM2 FB2 EAMP2 COMP Maxim Integrated 2 www.maximintegrated.com