MAX1843 - 2.7A、1MHz、低电压、降压型稳压器，内置同步整流，TQFN封装

MAX1843是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1843是2.7A、1MHz、低电压、降压型稳压器，内置同步整流，TQFN封装，本站介绍了MAX1843的封装应用图解、特点和优点、功能等，并给出了与MAX1843相关的Maxim元器件型号供参考。

MAX1843 - 2.7A、1MHz、低电压、降压型稳压器，内置同步整流，TQFN封装 - DC-DC开关调节器 - 2.7A、1MHz、内置开关降压调节器 - 美信半导体

产品概述

The MAX1843 constant-off-time, pulse-width modulated (PWM) step-down DC-DC converter is ideal for use in 5V and 3.3V to low-voltage conversion necessary in notebook and subnotebook computers. This device features an internal PMOS power switch and internal synchronous rectification for high efficiency and reduced component count. An external Schottky diode is not required. The internal 90mΩ power switch and 70mΩ nMOS synchronous-rectifier switch easily deliver continuous load currents up to 2.7A. The MAX1843 produces a preset +2.5V, +1.8V, or +1.5V output voltage or an adjustable output from +1.1V to VIN. It achieves efficiencies as high as 95%.

The MAX1843 uses 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. The MAX1843 features 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 MAX1843 is available in a 28-pin TQFN package with an exposed backside pad.

关键特性

以下关键特性由Maxim美信半导体提供：

±1% Output Accuracy

Up to 1MHz Switching Frequency

95% Efficiency

Internal pMOS/nMOS Switches

90mΩ/70mΩ On-Resistance at VIN = +4.5V

110mΩ/80mΩ 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

350µA Operating Supply Current

< 1µA Shutdown Supply Current

Programmable Constant-Off-Time Operation

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

28-Pin TQFN 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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