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MAX730A：5V、降压型、电流模式PWM DC-DC转换器

对于新设计推荐使用性能更好的器件：MAX1684/MAX1685

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 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)

MAX730A、MAX738A、MAX744A：典型工作电路 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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相关产品

• MAX1684：低噪声、14V输入、1A、PWM降压型转换器

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