MAX1742 - 1A/2.7A、1MHz、降压型稳压器，内置同步整流与开关

MAX1742是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1742是1A/2.7A、1MHz、降压型稳压器，内置同步整流与开关，本站介绍了MAX1742的封装应用图解、特点和优点、功能等，并给出了与MAX1742相关的Maxim元器件型号供参考。

MAX1742 - 1A/2.7A、1MHz、降压型稳压器，内置同步整流与开关 - DC-DC开关调节器 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The MAX1742/MAX1842 constant-off-time, pulse-width- modulated (PWM) step-down DC-DC converters are ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. These devices feature internal synchronous rectification for high efficiency and reduced component count. They require no external Schottky diode. The internal 90mΩ PMOS power switch and 70mΩ NMOS synchronous-rectifier switch easily deliver continuous load currents up to 1A. The MAX1742/MAX1842 produce a preset 2.5V, 1.8V, or 1.5V output voltage or an adjustable output from 1.1V to VIN. They achieve efficiencies as high as 95%.

The MAX1742/MAX1842 use a unique current-mode, constant-off-time, PWM control scheme, which includes Idle Mode™ to maintain high efficiency during light-load operation. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, allowing the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. Both devices are designed for continuous output currents up to 1A. The MAX1742 uses a peak current limit of 1.3A (min) and is suitable for applications requiring small external component size and high efficiency. The MAX1842 has a higher current limit of 3.1A (min) and is intended for applications requiring an occasional burst of output current up to 2.7A. Both devices also feature an adjustable soft-start to limit surge currents during startup, 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 MAX1742/MAX1842 are available in 16-pin QSOP packages.

For similar devices that provide continuous output currents up to 2A and 3A, refer to the MAX1644 and MAX1623 data sheets.

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

90mΩ On-Resistance at VIN = 4.5V

110mΩ On-Resistance at VIN = 3V

Output Voltage

2.5V, 1.8V, or 1.5V Pin Selectable

1.1V to VIN Adjustable

3V to 5.5V Input Voltage Range

600µA (max) Operating Supply Current

<1µA Shutdown Supply Current

Programmable Constant-Off-Time Operation

1MHz (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 QSOP Package

热门应用

5V或3.3V至低电压转换

芯片组供电

CPU I/O环

笔记本电脑和亚笔记本电脑

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