MAXIM MAX20057ATIB/VY+

The MAX20057 is an automotive highly integrated triple output PMIC. It includes two synchronous buck converters and an asynchronous boost controller with 2.1MHz and 400kHz options. The boost controller can be used to provide power to buck converters and keep them in regulation during cold-crank operation down to 2V battery input. 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 high-power requirements that operate at a wide input voltage range such as during automotive cold-crank or engine stop-start conditions. High switching frequency up to 2.1MHz allows small external components, reduced output ripple, and guarantees no AM band interference. The switching frequency is fixed at 400kHz or 2.1MHz. FSYNC input programmability enables three modes for optimized performance: forced fixed-frequency operation, skip mode with ultra-low quiescent current, and phase-locked synchronization to an external clock. The spread spectrum option minimizes EMI interference. The IC features the power-OK indicators for buck converters and undervoltage lockout for each power rail. Protection features include cycle-by-cycle current limit and thermal shutdown. The MAX20057 is specified for operation over the -40°C to +125°C automotive temperature range.

• Meets Stringent OEM Module Power Consumption and Performance Specifications
• 10μA Supply Current with 5V Buck On
• 8μA Supply Current with 3.3V Buck On
• 30μA Supply Current with All Regulators On
• Enables Crank-Ready Designs
• Output Voltages in Regulation Through Cold Crank Down to 2V Battery Voltage
• 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 Buck Converters with Asynchronous Boost Controller
• Current-Mode Controller 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

• Automotive Start-Stop System
• Instrument Cluster
• Distributed DC Power Systems
• Navigation and Radio Head Units