MAX17242

PRODUCTION

3.5V–36V, 2A/3A, Synchronous Buck Converter with 15µA Quiescent Current and Reduced EMI

Reliable Operation (42V Input Transient Protection), Long Battery Life (15µA IQ) and EN55022 EMI Performance

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Eliminates External Components and Reduces Total Cost
    • No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
    • Simple external RC Compensation for Stable Operation at Any Output Voltage
    • All-Ceramic Capacitor Solution: Ultra-Compact Layout with as Few as Eight External Components
    • PGOOD Output and High-Voltage EN Input Simplify Power Sequencing
  • Reduces Number of DC-DC Converters to Stock
    • Pin Compatibility for 2A/3A Options
    • Fixed Output Voltage with ±2% Accuracy (5V/3.3V) or Externally Resistor Adjustable (1V to 10V) with ±1% FB Accuracy
    • 220kHz to 2.2MHz Adjustable Frequency with External Synchronization
  • Reduces Power Dissipation
    • 93% Peak Efficiency
    • Shutdown Feature Blocks Current Flow from Input-to-Output or Vice-Versa
    • Less Than 5µA (typ) in Shutdown
    • Low 15µA (typ) Quiescent Current in Standby Mode
  • Operates Reliably
    • 42V Input Voltage Transient Protection
    • Fixed 8ms Internal Software Start Reduces Input Inrush Current
    • Cycle-by-Cycle Current Limit, Thermal Shutdown with Automatic Recovery
    • Reduced EMI Emission with Spread-Spectrum Control

The MAX17242/MAX17243 high-efficiency, synchronous step-down DC-DC converters with integrated MOSFETs operates over a 3.5V to 36V input voltage range, and can operate in drop-out condition by running at 99% duty cycle. The converters deliver up to 2A (MAX17242) and 3A (MAX17243) output current and generate fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V.

The devices use a current-mode-control architecture and can be operated in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high-efficiency operation. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

The devices are available in a compact 20-pin (5mm x 5mm) TQFN package with exposed pad. These parts are rated for -40°C to +85°C operation.

Design Solution: Online Simulator Validates Buck Converter Output Error Budget Analysis ›

Applications

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation
MAX17242
3.5V–36V, 2A/3A, Synchronous Buck Converter with 15µA Quiescent Current and Reduced EMI
MAX17242, MAX17243: Typical Application Circuit/Block Diagram
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Documentation

Data Sheet 1

Design Note 1

Technical Articles 1

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Software Resources

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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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SIMPLIS Models 1

Evaluation Kits

MAX17243EVKIT

Evaluation Kit for the MAX17243

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Features and Benefits

  • Wide 5.6V to 36V Input Supply Range
  • Forced-PWM or Skip-Mode Operation
  • Programmable Switching Frequency (2.2MHz Default)
  • Power-Good Output
  • 4-Layer 2oz Copper
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX17243 evaluation kit (EV kit) demonstrates the MAX17243 high-voltage, current-mode step-down converters with low operating current. The EV kit operates over a wide 5.6V to 36V input range and the output is set for 5V at 3A.

The EV kit comes with the MAX17243ATPA/V+ installed.

Applications

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation

MAX17242EVKIT

Evaluation Kit for the MAX17242

Buy Now View Details

Features and Benefits

  • Wide 3.5V to 36V Input Supply Range
  • 96% Peak Efficiency @ 3.5V Input in Skip Mode
  • Forced-PWM or Skip-Mode Operation
  • Programmable Switching Frequency (400kHz Default)
  • Selectable Spread Spectrum Optimizes EMI Performance
  • FSYNC Input and Power-Good Output
  • Proven 4-Layer 2oz Copper PCB Layout
  • Demonstrates 950mil × 835mil Solution Size
  • Fully Assembled and Tested

Product Details

The MAX17242 evaluation kit (EV kit) demonstrates the MAX17242 high-voltage, current-mode step-down converters with low operating current. The EV kit operates over a wide 3.5V to 36V input range and the output is set for 3.3V at 2A.

The EV kit comes with the MAX17242ETPB installed.

Applications

  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • Wall Transformer Regulation
MAX17243EVKIT
Evaluation Kit for the MAX17243
MAX17242EVKIT
Evaluation Kit for the MAX17242

Reference Designs
MAXREFDES1171
Low-Power Fault Indicators
MAXREFDES1171

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