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3.3V、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:MAX887替代MAX763A,MAX1684/MAX1685替代MAX748A

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.3
VIN (V) (max) 16
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 212.5
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
3.91
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.3
VIN (V) (max) 16
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 212.5
Package/Pins PDIP/8
SOIC (W)/16
Budgetary
Price (See Notes)
3.91

主要特征

  • 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)

应用/用途

  • 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

描述

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.

简化框图

MAX748A、MAX763A:典型工作电路 MAX748A、MAX763A:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

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