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MAX17543

MAX17543

4.5V-42V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

Wide Input Voltage, 2.5A Internal FET Synchronous Buck Converter Ideal for Industrial Applications

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Overview

Description

The MAX17543 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 42V input. The converter can deliver up to 2.5A and generates output voltages from 0.9V up to 0.9 x VIN. The feedback (FB) voltage is accurate to within ±1.1% over -40°C to +125°C.

The MAX17543 uses peak current-mode control. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous conduction mode (DCM) control schemes.

The device is available in a 20-pin (4mm × 4mm) TQFN package. Simulation models are available.
MAX17543: Block Diagram MAX17543: Block Diagram Enlarge+

Key Features

  • Reduces External Components and Total Cost
    • No Schottky—Synchronous Operation
    • Internal Compensation for Any Output Voltage
    • Built-In Soft-Start
    • All-Ceramic Capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 42V Input
    • Adjustable 0.9V to 0.9 x VIN Output
    • 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization
  • Reduces Power Dissipation
    • Peak Efficiency >90%
    • PFM/DCM Enables Enhanced Light-Load Efficiency
    • 2.8µA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Peak Current-Limit Protection
    • Built-In Output Voltage Monitoring with Active-Low RESET
    • Programmable EN/UVLO Threshold
    • Monotonic Startup into Prebiased Load
    • Overtemperature Protection
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range

Applications/Uses

  • Base Station Power Supply
  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • High-Voltage Single-Board Systems
  • Industrial Power Supplies

Parametric Specs

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX17543 4.5420.936Resistor2.5InternalYesYes12200EE-Sim
TQFN-CU/20
$1.67 @1k
See All Step-Down Switching Regulators (388)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX17543EVKITA: Evaluation Kit for the MAX17543 in 3.3V Output-Voltage Application
MAX17543EVKITB: Evaluation Kit for the MAX17543 in 5V Output-Voltage Application

Technical Documents

User Guide 5861 EE-SIM Design and Simulation Environment User Guide

Quality and Environmental Data

Product Reliability Reports: MAX17543.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • EE-Sim: Design & Simulate MAX17543
  • MAX17543 SIMPLIS Schematic

    •

    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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    Tools & Models

    Technical Docs

    Type ID PDF Title
    User Guide 5861 EE-SIM Design and Simulation Environment User Guide

    Reference Designs

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    Evaluation Board8628MAX17543EVKITB Evaluation Kit for the MAX17543 in 5V Output-Voltage Application
    Evaluation Board8553MAX17543EVKITA Evaluation Kit for the MAX17543 in 3.3V Output-Voltage Application