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Analog Devices / Maxim Integrated MAX17244同步降压直流-直流转换器

Maxim MAX17244同步降压直流-直流转换器具有集成MOSFET，可在3.5V至36V输入电压范围内工作，提供42V输入瞬态保护。MAX17244 通过在 98% 空占比下运行实现在掉电条件下工作。该转换器提供 2.5A 电流，生成 3.3V/5V 固定输出电压，同时具有设置 1V-10V 输出电压的能力。MAX17244 采用电流模式控制构架。该器件可在脉冲宽度调制 (PWM) 或脉冲频率调制等控制模式下工作。PWM 操作模式可提供各种负载下的恒定频率工作，适用于对开关频率敏感的应用。PFM操作模式可禁用负感应电流，并在轻负载下跳脉冲，实现高效率。

The Analog Devices MAX17244 Synchronous Step-Down DC-DC Converter is available in TQFN-16 and TSSOP-16 packages.

特性

  • Eliminates external components and reduces total cost
    • Integrated high-side and low-side switch enables synchronous operation for high efficiency and reduced cost
    • All-ceramic capacitor solution allows ultra-compact solution size
    • 220kHz to 2.2MHz adjustable frequency with external synchronization
    • PGOOD output and high-voltage EN input simplify power sequencing
  • Increases Design Flexibility
    • 180° out-of-phase clock output at SYNCOUT enables cascaded power supplies for increased power output
    • Fixed output voltage with ±2% accuracy (5.0V/3.3V) or externally resistor adjustable (1.0V to 10.0V)
  • Package
    • -40°C to +85°C operating temperature range
    • TQFN-16 and TSSOP-16 package options
  • Reduces power dissipation
    • >90% peak efficiency
    • PWM and PFM operation optimizes conversion efficiency from heavy to light loads
    • Automatic lx slew-rate adjustment for optimum efficiency across operating frequency range
    • Low 5μA (typ.) shutdown current
    • Low 28μA (typ.) quiescent current
  • 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

应用

  • 分布式电源调节
  • 壁式变压器调节
  • 通用负载点

典型应用电路

应用电路图 - Analog Devices / Maxim Integrated MAX17244同步降压直流-直流转换器

Block Diagram

框图 - Analog Devices / Maxim Integrated MAX17244同步降压直流-直流转换器
发布日期: 2016-09-16 | 更新日期: 2023-04-12