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MAX1644：2A、低电压、降压型稳压器，内置同步整流与开关

业内尺寸最小的2A DC-DC，带有同步整流器

The MAX1644 constant-off-time, PWM step-down DC-DC converter is ideal for use in applications such as PC cards, CPU daughter cards, and desktop computer bus-termination boards. The device features internal synchronous rectification for high efficiency and reduced component count. It requires no external Schottky diode. The internal 0.10Ω PMOS power switch and 0.10Ω NMOS synchronous-rectifier switch easily deliver continuous load currents up to 2A. The MAX1644 produces a preset +3.3V or +2.5V output voltage or an adjustable output from +1.1V to VIN. It achieves efficiencies as high as 95%. The MAX1644 uses a unique current-mode, constant-off-time, PWM control scheme, which includes an Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 350kHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. The device also features an adjustable soft-start to limit surge currents during start-up, a 100% duty cycle mode for low-dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1644 is available in a 16-pin SSOP package.

关键特性 ±1% Output Accuracy 95% Efficiency Internal PMOS and NMOS Switches 70mΩ On-Resistance at VIN = +4.5V 100mΩ On-Resistance at VIN = +3V Output Voltage +3.3V or +2.5V Pin-Selectable +1.1V to VIN Adjustable +3V to +5.5V Input Voltage Range 360µA (max) Operating Supply Current < 1µA Shutdown Supply Current Programmable Constant-Off-Time Operation 350kHz (max) Switching Frequency Idle Mode Operation at Light Loads Thermal Shutdown Adjustable Soft-Start Inrush Current Limiting 100% Duty Cycle During Low-Dropout Operation Output Short-Circuit Protection 16-Pin SSOP Package

MAX1644：典型工作电路 应用 +3.3V PC卡及CardBus应用 +5V至+3.3V/+2.5V转换 CPU子卡电源 CPU I/O电源 台式机总线端接板 笔记本电脑和亚笔记本电脑

数据手册DataSheet

关键参数

开发工具

• MAX1644EVKIT

技术资料

• Reduce the Chances of Human Error: Part 1, Power and Ground
• Dual Voltage Tracking Circuit for I/O, Microprocessor, and DSP Core Voltages
• Accurate DC-DC Converter Minimizes Wasted Power

质量和环境数据

• MAX1644.pdf

相关产品

• MAX1623：3A、低电压、降压型稳压器，内置同步整流与开关

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