Maxim Integrated 美信 MAX17552 高效高压同步降压型转换器

美信MAX17552 高效高压同步降压型转换器集成了采用 4V 到 60V 输入电压工作的 MOSFET。该转换器在输出电压在 0.8V 到 0.9 倍 VIN 时可输出高达 100mA 的电流。输出电压精确到 ±1.75% 内（在 -40°C 到 +125°C 的温度范围内）。该器件采用峰值电流模式控制架构，带有 MODE 引脚，可在脉冲宽度调制、脉冲频率调制控制模式下操作器件。PWM 操作模式可实现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。PFM 模式下，该转换器仅消耗 22µA 的无负载电源电流。低电阻、片上 MOSFET 可确保满载时的高效，同时简化了电路板布局。

特性

Eliminates External Components and Reduces Total Cost
- No Schottky—Synchronous Operation for High Efficiency and Reduced Cost
- Internal Compensation
- Fixed Internal 5.1ms or Programmable Soft-Start
- All-Ceramic Capacitors, Ultra-Compact Layout
Reduces Number of DC-DC Regulators to Stock
- Wide 4V to 60V Input Voltage Range
- Adjustable 0.8V to 0.9 x VIN Output Voltages
- Delivers Up to 100mA Load Current
- 100kHz to 2.2MHz Adjustable Switching Frequency Range with External Synchronization
- Configurable Between PFM and Forced-PWM Modes

Reduces Power Dissipation
- 22µA No Load Supply Current
- Peak Efficiency > 90%
- PFM Feature for High Light-Load Efficiency
- 1.2µA (typ) Shutdown Current
Operates Reliably in Adverse Industrial Environments
- Peak Current-Limit Protection
Built-In Output-Voltage Monitoring with Open-Drain Active-Low RESET Pin
- Programmable EN/UVLO Threshold
- Monotonic Startup into Prebiased Output
- Overtemperature Protection
- -40°C to +125°C Industrial/Automotive Temperature Range