MAX744A - 5V、降压型、电流模式PWM DC-DC转换器

MAX744A是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX744A是5V、降压型、电流模式PWM DC-DC转换器，本站介绍了MAX744A的封装应用图解、特点和优点、功能等，并给出了与MAX744A相关的Maxim元器件型号供参考。

MAX744A - 5V、降压型、电流模式PWM DC-DC转换器 - DC-DC开关调节器 - 对于新设计推荐使用性能更好的器件：MAX1684/MAX1685 - 美信半导体

产品概述

The MAX730A/MAX738A/MAX744A are 5V-output CMOS, step-down switching regulators. The MAX738A/MAX744A accept inputs from 6V to 16V and deliver 750mA. The MAX744A guarantees 500mA load capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficiencies are 85% to 96%. Quiescent supply current is 1.7mA and only 6µA in shutdown.

Pulse-width modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary.

The MAX730A/MAX738A/MAX744A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.

关键特性

以下关键特性由Maxim美信半导体提供：

750mA Load Currents (MAX738A/MAX744A)

High-Frequency, Current-Mode PWM

159kHz to 212.5kHz Guaranteed Oscillator Frequency Limits (MAX744A)

85% to 96% Efficiencies

1.7mA Quiescent Current

6µA Shutdown Supply Current

Single Preselected Inductor Value, No Component Design Required

Overcurrent, Soft-Start, and Undervoltage Lockout Protection

Cycle-by-Cycle Current Limiting

8-Pin DIP/SO Packages (MAX730A)

热门应用

蜂窝电话

计算机外设

分布式供电系统

个人通信装置

便携式仪表

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