EVALUATION KIT AVAILABLE MAX17242/MAX17243 3.5V36V, 2A/3A, Synchronous Buck Converter with 15A Quiescent Current and Reduced EMI General Description Benefits and Features The MAX17242/MAX17243 high-efficiency, synchronous Eliminates External Components and Reduces Total Cost step-down DC-DC converters with integrated MOSFETs No Schottky-Synchronous Operation for High operates over a 3.5V to 36V input voltage range, and Efficiency and Reduced Cost Simple external RC Compensation for Stable can operate in drop-out condition by running at 99% duty cycle. The converters deliver up to 2A (MAX17242) and Operation at Any Output Voltage All-Ceramic Capacitor Solution: Ultra-Compact 3A (MAX17243) output current and generate fixed output voltages of 3.3V/5V, along with the ability to program the Layout with as Few as Eight External Components PGOOD Output and High-Voltage EN Input output voltage between 1V to 10V. Simplify Power Sequencing The devices use a current-mode-control architecture and Reduces Number of DC-DC Converters to Stock can be operated in the pulse-width modulation (PWM) Pin Compatibility for 2A/3A Options or pulse-frequency modulation (PFM) control schemes. Fixed Output Voltage with 2% Accuracy (5V/3.3V) PWM operation provides constant frequency operation at or Externally Resistor Adjustable (1V to 10V) with all loads, and is useful in applications sensitive to switching 1% FB Accuracy frequency. PFM operation disables negative inductor 220kHz to 2.2MHz Adjustable Frequency with current and additionally skips pulses at light loads for External Synchronization high-efficiency operation. The low-resistance, on-chip Reduces Power Dissipation MOSFETs ensure high efficiency at full load and simplify 93% Peak Efficiency the layout. Shutdown Feature Blocks Current Flow from Input- The devices are available in a compact 20-pin (5mm x 5mm) to-Output or Vice-Versa TQFN package with exposed pad. These parts are rated for Less Than 5A (typ) in Shutdown -40C to +85C operation. Low 15A (typ) Quiescent Current in Standby Mode Applications Operates Reliably Distributed Supply Regulation 42V Input Voltage Transient Protection Wall Transformer Regulation Fixed 8ms Internal Software Start Reduces Input General-Purpose Point-of-Load Inrush Current Cycle-by-Cycle Current Limit, Thermal Shutdown Ordering Information appears at end of data sheet. with Automatic Recovery Reduced EMI Emission with Spread-Spectrum Control 19-7767 Rev 0 10/15MAX17242/MAX17243 3.5V36V, 2A/3A, Synchronous Buck Converter with 15A Quiescent Current and Reduced EMI Typical Application Circuit/Block Diagram VOUT= 3.3V/5V AT 3A,2.2MHz 2.2H 0.1F 2 x 22F FOSC BST 12k OUT PGND MAX17242 MAX17243 FB PGND COMP SPS 20.0k BIAS PGOOD 2.2F 1,000pF BAT V 2.2F 4.7F Maxim Integrated 2 www.maximintegrated.com AGND FSYNC EP N.C. EN LX SUPSW SUPSW LX SUP LX