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4.5V to 36V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

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

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主要特征

简化框图

Technical Docs

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主要特征

  • Reduces External Components and Total Cost
    • No Schottky—Synchronous Operation
    • Internal Control Loop Compensation
    • Internal Soft-Start
    • All Ceramic Capacitors, Ultra-Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 36V Input Voltage Range
    • Adjustable Output from 0.9V up to 89% of VIN
    • Delivers Up to 1A Load Current
  • High Efficiency
    • 90% Full-Load Efficiency (VIN = 24V, VOUT = 5V, IOUT = 1A)
    • 2.2μA (typ) Shutdown Current
    • High Light-Load Efficiency with PFM Mode (MAX17645D)
  • Flexible Design
    • Programmable EN/UVLO Threshold
    • Monotonic Startup into Prebiased Output
    • Open-Drain Output (Actiive-Low RESET) for Output Status Monitoring
  • Robust Operation
    • Built-In Hiccup Mode Overload Protection
    • Overtemperature Protection
    • CISPR32 Class B Compliant
    • Wide -40°C to +125°C Ambient Operating Temperature/-40°C to +150°C Junction Temperature

应用/用途

  • Factory Automation
  • Aftermarket Market Automation
  • General Point of Load

描述

The MAX17645 is a high-efficiency, high voltage, synchronous step-down DC-DC converter with integrated MOSFETs, operates over a 4.5V to 36V input. It can deliver up to 1A load current. The MAX17645 operates at 650kHz switching frequency. The MAX17645B operates in pulse-width modulation (PWM) mode at all loads. The MAX17645D operates in pulse-frequency modulation (PFM) mode at light loads. The output voltage is programmable from 0.9V up to 89% of VIN. Built-in control loop compensation across the output voltage range eliminates the need for external compensation components. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.1%.

The device features a peak-current-mode control architecture. In this architecture, while operating in PWM mode the part sets the duty cycle using a transconductance error amplifier, a PWM comparator, a high-side current-sense amplifier, and a slope-compensation generator. At each rising edge of the clock, the high-side MOSFET turns on and remains on until either the appropriate or maximum duty cycle is reached, or the peak current limit is detected. During the high-side MOSFET’s on-time, the inductor current ramps up. During the rest of the switching cycle, the high-side MOSFET remains off and the low-side MOSFET remains on, inductor current ramps down. An appropriate dead time is implemented between the high-side and low-side state transitions to avoid cross conduction.

A fixed soft-start time of 3.15ms (typ) allows users to reduce input inrush current. The device also features an enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET feature provides a power-good signal to the system upon achieving successful regulation of the output voltage.

简化框图

MAX17645: Simplified Application Diagram MAX17645:Simplified Application Diagram Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后,所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站,请创建一个新帐户。有关此样片网站的任何问题,请联系SampleSupport@analog.com