MAX744A: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
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
数据手册DataSheet
语言下载文件备注
英文MAX730A-MAX744A.pdfRev 2; 01/1996
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX730A5.211555
  • Preset
  • Resistor
0.45Internal1210
  • CDIP(N)/8
  • PDIP(N)/8
  • SOIC(N)/8
$2.26 @1k
MAX738A6160.75190
  • CDIP(N)/8
  • PDIP(N)/8
  • SOIC(W)/16
$3.38 @1k
MAX744A6160.75212.5
  • CDIP(N)/8
  • PDIP(N)/8
  • SOIC(W)/16
$3.38 @1k
质量和环境数据
相关产品
  • MAX1684:低噪声、14V输入、1A、PWM降压型转换器
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX744AC/D停止供货DICE SALES,;NA引脚;DICE;0°C至+70°C参考数据资料
MAX744ACPA停止供货MAX744ACPA+PDIP(N),;8引脚;81.9mm²0°C至+70°CRoHS/无铅:否
MAX744ACPA+生产中PDIP(N),;8引脚;81.9mm²0°C至+70°CRoHS/无铅:无铅
MAX744ACWE停止供货MAX744ACWE+SOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:否
MAX744ACWE+生产中SOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:无铅
MAX744ACWE+T生产中SOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:无铅
MAX744ACWE-T停止供货MAX744ACWE+TSOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:否
MAX744AEPA停止供货MAX744AEPA+PDIP(N),;8引脚;81.9mm²-40°C至+85°CRoHS/无铅:否
MAX744AEPA+生产中PDIP(N),;8引脚;81.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX744AEWE停止供货MAX744AEWE+SOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:否
型号状况推荐替代产品封装:类型 引脚 占位面积封装图 编码/变更 *温度RoHS/无铅?
MAX744AEWE+生产中SOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:无铅
MAX744AEWE+T生产中SOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:无铅
MAX744AEWE-T停止供货MAX744AEWE+TSOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:否
MAX744AMJA停止供货CDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX730A-MAX744A.pdf MAX744A
MAX744A.pdf MAX744A
典型工作电路 MAX744A