MAX845:隔离型、变压器驱动器,适用于PCMCIA设计

内置功率MOSFET,节省空间,可提供750mW功率

The MAX845 provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated positive or negative voltage at powers up to 750mW. The MAX845 consists of an oscillator followed by a toggle flip-flop. The flip-flop generates two 50% duty-cycle square waves, which are complementary at half the oscillator frequency (450kHz, min). These two signals drive the ground-referenced N-channel power switches. Internal circuitry ensures break-before-make action between the two switches. A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evaluation kit (MAX845EVKIT-MM) is available to evaluate low-profile 5V 40mA and 5V 100mA applications.

关键特性
  • Transformer Driver for Ultra-Thin 5V-µs Transformers
  • Isolated DC-to-DC Power Supply for PCMCIA Applications
  • 450kHz Minimum Switching Frequency
  • Ultra-Low Input Supply Current Ripple
  • Single +5V or +3.3V Supply
  • 5µW Low-Power Shutdown Mode
  • 8-Pin SO and µMAX Packages
  • Low Output Ripple Permits Miniature Output Capacitors
功能框图
MAX845:典型工作电路
产品应用
  • 桥接地电位差
  • 隔离型数据采集
  • 隔离型接口供电
  • 低功耗LAN网络
  • 医疗装置
  • 噪声抑制通信接口
  • PCMCIA调制解调器卡
  • 过程控制
关键参数
Part NumberVIN
(V)
VIN
(V)
Driver Output Resistance
(Ω)
Max. IOUT
(A)
TopologyFreq.
(kHz)
ICC
(mA)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxmaxmaxSee Notes
MAX8452.5640.2Push-Pull8601.1
µMAX/8
SOIC(N)/8
-40 to +85$2.23 @1k
数据手册DataSheet
英文MAX845.pdfRev 4; 10/1997
开发工具
技术资料
质量和环境数据
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX845C/D生产中DICE SALES,;NA引脚;DICE;参考数据资料
MAX845ESA最后一次购买MAX845ESA+SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX845ESA+生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX845ESA+T生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX845ESA-T最后一次购买MAX845ESA+TSOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX845ESA/GH9停止供货MAX845ESA+SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX845ESA/GH9-T生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX845EUA最后一次购买MAX845EUA+µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:否
MAX845EUA+生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX845EUA+T生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
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?
MAX845EUA-T最后一次购买MAX845EUA+TµMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:否
MAX845.pdf MAX845
MAX845.pdf MAX845
MAX845.pdf MAX845
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