MAX17634A

4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter

A High-Efficiency, High-Voltage, Synchronous Step-Down DC-DC Converter with Integrated MOSFETs


Please check latest availability status for a specific part variant.

Description

The MAX17634x is a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operating over an input-voltage range of 4.5V to 36V. It can deliver up to 4.25A current. The MAX17634 is available in three variants: MAX17634A, MAX17634B, and MAX17634C. The MAX17634A and MAX17634B are fixed 3.3V and fixed 5V output voltage parts, respectively. The MAX17634C is an adjustable output voltage (from 0.9V up to 90% of VIN) part. Built-in compensation across the output voltage range eliminates the need for external components.

The MAX17634x features peak-current-mode control architecture. The device can be operated in forced pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and lightload conditions. The MAX17634x offers a low minimum on time that allows high switching frequencies and a smaller solution size.

The feedback voltage regulation accuracy over -40°C to +125°C for the MAX17634x is ±1.3%.The device is available in a compact 20-pin (4mm x 4mm) TQFN package. Simulation models are available.

MAX17634A, MAX17634B, MAX17634C: Functional Diagram MAX17634A, MAX17634B, MAX17634C: Functional Diagram Enlarge+

Key Features

  • Reduces External Components and Total Cost
    • No Schottky–Synchronous Operation
    • Internal Compensation Components
    • All-Ceramic Capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 36V Input
    • Adjustable Output Range from 0.9V up to 90% of VIN
    • 400kHz to 2.2MHz Adjustable Frequency with External Synchronization
    • Available in a 20-Pin, 4mm x 4mm TQFN Package
  • Reduces Power Dissipation
    • Peak Efficiency of 94%
    • PFM and DCM Modes Enable Enhanced Light-Load Efficiency
    • Auxiliary Bootstrap Supply (EXTVCC) for Improved Efficiency
    • 2.8μA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Hiccup-Mode Overload Protection
    • Adjustable and Monotonic Startup with Prebiased Output Voltage
    • Built-in Output-Voltage Monitoring with RESET (Active Low)
    • Programmable EN/UVLO Threshold
    • Overtemperature Protection
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

Applications/Uses

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

MAX17634AEVKIT: Evaluation Kit for the MAX17634A 3.3V Output-Voltage Application
MAX17634BEVKIT: Evaluation Kit for the MAX17634B 5V Output-Voltage Application
MAX17634CEVKIT: Evaluation Kit for the MAX17634C 5V Output-Voltage Application

Tools & Models

  • EE-Sim: Design & Simulate MAX17634A
  • Request Reliability Report for: MAX17634A 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    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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    Type ID Title
    Evaluation Board10433MAX17634CEVKIT Evaluation Kit for the MAX17634C 5V Output-Voltage Application
    Evaluation Board10432MAX17634BEVKIT Evaluation Kit for the MAX17634B 5V Output-Voltage Application
    Evaluation Board10431MAX17634AEVKIT Evaluation Kit for the MAX17634A 3.3V Output-Voltage Application