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可调、PWM、降压型稳压器

对于新设计推荐使用性能更好的器件:MAX887替代MAX750A,MAX1684/MAX1685替代MAX758A

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 11
IOUT1 (A) (max) 0.45
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 190
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.66
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简化框图

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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 11
IOUT1 (A) (max) 0.45
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 190
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.66

主要特征

  • Up to 750mA Load Currents
  • 160kHz High-Frequency, Current-Mode PWM
  • 85% to 96% Efficiencies
  • 33µH or 100µH Pre-Selected Inductor Value, No Component Design Required
  • 1.7mA Quiescent Supply Current
  • 6µA Shutdown Supply Current
  • Adjustable Output Voltage
  • Overcurrent, Soft-Start, and Undervoltage Lockout Protection
  • Cycle-by-Cycle Current Limiting
  • 8-Pin DIP/SO Packages (MAX750A)

应用/用途

  • 蜂窝电话
  • 计算机外设
  • 便携式通信设备
  • 便携式仪表

描述

The MAX750A/MAX758A are adjustable-output, CMOS, step-down, DC-DC switching regulators. The MAX758A accepts inputs from 4V to 16V and delivers 750mA, while the MAX750A accepts inputs from 4V to 11V and delivers 450mA. Typical efficiencies are 85% to 90%. Typical quiescent current is 1.7mA, or only 6µA in shutdown mode. The output does not exhibit any ripple at subharmonics of the switching frequency over its specified range.

Pulse-width-modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±4.5% plus feedback-resistor tolerance over line, load, and temperature variations. Fixed-frequency switching and absence of subharmonic ripple 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.

简化框图

MAX750A、MAX758A:典型工作电路 MAX750A、MAX758A:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心