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4V to 60V, 50mA, Ultra-Small, High Efficiency, Synchronous Step-Down DC-DC Converter

60V, Low IQ Synchronous Buck Regulator Enables High Efficiency

製品の詳細

主な特長

簡易ブロック図

Technical Docs

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主な特長

  • Reduces External Components and Total Cost
    • No Schottky–Synchronous Operation
    • Internal Control Loop Compensation
    • Internal Fixed Soft-Start
    • All-Ceramic Capacitors, Ultra-Compact Layout
  • ​Reduces Number of DC-DC Regulators to Stock
    • Wide 4V to 60V Input Voltage Range
    • Adjustable Output Range from 0.8V up to 90% of VIN (MAX17553C)
    • Delivers Up to 50mA Load Current
    • 150kHz to 1.5MHz Adjustable Switching Frequency
  • Reduces Power Dissipation
    • 91.5% Full Load Efficiency (VIN = 24V, VOUT = 5V)
    • Higher Light-Load Efficiency with Discontinuous-Conduction Mode (DCM) Operation
    • Power Loss Reduction with External Boot-Strap Input (FB/VO) for Internal Circuitry (MAX17553A and MAX17553B only)
    • 3.8μA Shutdown Current
  • Flexible Design
    • Programmable EN/UV and HYST Threshold
    • Open-Drain Output Active-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

アプリケーション/用途

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

説明

The MAX17553 is an ultra-small, high-efficiency, high voltage, synchronous step-down DC-DC converter with integrated MOSFETs that operates over a wide input voltage range from 4V to 60V and delivers up to 50mA of load current. The MAX17553 is available in three variants: MAX17553A, MAX17553B, and MAX17553C. MAX17553A and MAX17553B are fixed 3.3V and 5V output voltage devices, respectively. MAX17553C is an adjustable output (0.8V to 0.9 x VIN) device. The feedback-voltage regulation accuracy of the converters over the -40°C to +125°C temperature range is ±1.5% for MAX17553A and MAX17553B, and ±1.25% for MAX17553C.

The device features a peak-current-mode control architecture. During normal operation, at each rising edge of the clock, the high-side p-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 p-MOSFET on-time, the inductor current ramps up. During the rest of the switching cycle or until the inductor current reaches zero, the high-side p-MOSFET remains off and the low-side n-MOSFET remains on, and the inductor current ramps down. The device features the Discontinuous Conduction Mode (DCM), in which the negative inductor current is inhibited to enable higher light load efficiency. In DCM, the device operates at a fixed switching frequency until the minimum on-time is reached. If the load demand is less than the energy corresponding to the minimum on-time pulse, the converter skips pulses to maintain output voltage regulation.

A fixed soft-start time of 3.2ms (typ) allows users to reduce input inrush current. An open-drain active-low RESET feature provides a power-good signal to the system upon achieving successful regulation of the output voltage.

簡易ブロック図

MAX17553: Simplified Application Diagram MAX17553: Simplified Application Diagram Zoom icon

Technical Docs

サポートとトレーニング

技術質問への回答についてはナレッジベースで検索ください。

絞り込まれた検索

マキシムでは、お客様の技術的質問にお答えするため、アプリケーションエンジニアの専任チームも配置しています。 サポートセンター をご利用ください。