MAX1644 - 2A、低电压、降压型稳压器，内置同步整流与开关

MAX1644是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1644是2A、低电压、降压型稳压器，内置同步整流与开关，本站介绍了MAX1644的封装应用图解、特点和优点、功能等，并给出了与MAX1644相关的Maxim元器件型号供参考。

MAX1644 - 2A、低电压、降压型稳压器，内置同步整流与开关 - DC-DC开关调节器 - 业内尺寸最小的2A DC-DC，带有同步整流器 - 美信半导体

产品概述

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

以下关键特性由Maxim美信半导体提供：

±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

热门应用

+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

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