MAX748A - 3.3V、降压型、电流模式PWM DC-DC转换器

MAX748A是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX748A是3.3V、降压型、电流模式PWM DC-DC转换器，本站介绍了MAX748A的封装应用图解、特点和优点、功能等，并给出了与MAX748A相关的Maxim元器件型号供参考。

MAX748A - 3.3V、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：MAX887替代MAX763A，MAX1684/MAX1685替代MAX748A - 美信半导体

产品概述

The MAX748A/MAX763A are 3.3V-output CMOS, step-down switching regulators. The MAX748A accepts inputs from 3.3V to 16V and delivers up to 500mA. The MAX763A accepts inputs between 3.3V and 11V and delivers up to 500mA. Typical efficiencies are 85% to 90%. Quiescent supply current is 1.4mA (MAX763A), and only 0.2µA 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. A 22µH inductor works in most applications, so no magnetics design is necessary.

The MAX748A/MAX763A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection. The MAX748A is available in 8-pin DIP and 16-pin wide SO packages; the MAX763A comes in 8-pin DIP and SO packages.

关键特性

以下关键特性由Maxim美信半导体提供：

Up to 500mA Load Currents

Guaranteed 159kHz to 219.5kHz Current-Mode PWM

85% to 90% Efficiencies

1.7mA Quiescent Current (MAX748A)

1.4mA Quiescent Current (MAX763A)

0.2µA Shutdown Supply Current

22µH Preselected Inductor Value; No Component Design Required

Overcurrent, Soft-Start, and Undervoltage Lockout Protection

Cycle-by-Cycle Current Limiting

8-Pin DIP/SO Packages (MAX763A)

热门应用

5V至3.3V转换

蜂窝电话

计算机外设

手持式计算机

便携式仪表

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