MAX20057ATIA/VY+ Analog Devices

Click here to ask about the production status of specific part numbers. MAX20057 36V Boost Controller with Two Synchronous Buck Converters (3.5A/2A) for Automotive Applications General Description Benefits and Features The MAX20057 is an automotive highly integrated triple Meets Stringent OEM Module Power Consumption output PMIC. It includes two synchronous buck converters and Performance Specifications and an asynchronous boost controller with 2.1MHz and 10A Supply Current with 5V Buck On 400kHz options. The boost controller can be used to pro- 8A Supply Current with 3.3V Buck On vide power to buck converters and keep them in regulation 30A Supply Current with All Regulators On during cold-crank operation down to 2V battery input. Two Enables Crank-Ready Designs high-voltage synchronous step-down converters operate Output Voltages in Regulation Through Cold Crank 180 out-of-phase. The IC operates with an input voltage Down to 2V Battery Voltage supply from 3.5V to 36V and can operate in dropout condi- Wide Input Supply Range from 3.5V to 36V tions by running at 95% duty cycle. It is intended for appli- EMI Reduction Features Reduce Interference with cations with mid- to high-power requirements that operate Sensitive Radio Bands without Sacrificing Wide Input at a wide input voltage range such as during automotive Voltage Range cold-crank or engine stop-start conditions. 20ns (typ) Minimum On-Time Guarantees Skip- High switching frequency up to 2.1MHz allows small ex- Free Operation for 3.3V Output at 2.1MHz ternal components, reduced output ripple, and guarantees Spread-Spectrum Option no AM band interference. The switching frequency is fixed Phase-Locked Loop (PLL) Frequency at 400kHz or 2.1MHz. FSYNC input programmability en- Synchronization ables three modes for optimized performance: forced Integration and Thermally Enhanced Packages Save fixed-frequency operation, skip mode with ultra-low quies- Board Space and Cost cent current, and phase-locked synchronization to an ex- Two 2.1MHz Buck Converters with Asynchronous ternal clock. The spread spectrum option minimizes EMI Boost Controller interference. Current-Mode Controller with Forced Fixed The IC features the power-OK indicators for buck convert- Frequency and Skip Modes ers and undervoltage lockout for each power rail. Protec- Thermally Enhanced 5mm x 5mm, 28-Pin TQFN- tion features include cycle-by-cycle current limit and ther- EP Package mal shutdown. The MAX20057 is specified for operation Protection Features Improve System Reliability over the -40C to +125C automotive temperature range. Supply Undervoltage Lockout Overtemperature and Short-Circuit Protection Applications Automotive Start-Stop System Ordering Information appears at end of data sheet. Instrument Cluster Distributed DC Power Systems Navigation and Radio Head Units 19-100442 Rev 4 3/20MAX20057 36V Boost Controller with Two Synchronous Buck Converters (3.5A/2A) for Automotive Applications Simplified Block Diagram BUCK1 CONTROL LOGIC PGOOD1 PGOOD MAX20057MAX20057 COMP THRESHOLD FB1 FEEDBACK SUPSW1 SELECT LOGIC EAMP1 BST1 INTERNAL EN1 SOFT START OUT1 BUCK1 PWM1 LX1 PWM1 GATE DRIVE CURRENT SENSE LOGIC AND SLOPE COMP BIAS LX1 EN1 CLK1 CLK1 BIAS PGND1 SPREAD SPECTRUM OSCILLATOR ON/OFF OPTION BUF PLL/SYNC INTERNAL BIAS BIAS DETECTION LINEAR REGULATOR CLK3 FSYNC FSYNC SELECT CLK 180 LOGIC OUT OF PHASE EXTVCC AGND SWITCHOVER BIAS SUPSW2 CLK2 BST2 FB2 EN2 BUCK2 OUT2 GATE DRIVE BUCK2 CONTROL LOGIC LOGIC LX2 EN2 PWM2 SAME AS BUCK1 BIAS PGOOD2 CLK2 PGND2 BOOST CONTROL LOGIC EN3 UVLO EN3 BATTS UVLO CLK3 BOOST PGND3 GATE DRIVE CSP CURRENT SENSE CLK3 LOGIC AND SLOPE COMP PWM3 DL PWM3 FB3 EAMP3 COMP www.maximintegrated.com Maxim Integrated 2