MAX253:1W原边变压器H桥驱动器,用于隔离电源

The MAX253 monolithic oscillator/power-driver is specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. The device drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W. The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches. The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.

关键特性
  • Simple Power-Supply Transformer Driver Design for Isolated RS-485/RS-232 Data-Interface Applications
    • Single 5V or 3.3V Supply
    • Low-Current Shutdown Mode: 0.4µA
    • Pin-Selectable Frequency: 350kHz or 200kHz
  • 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space
功能框图
MAX253:典型工作电路
产品应用
  • 桥接地电位差
  • 高噪声抑制通信接口
  • 隔离型和/或高压电源
  • 隔离型RS-485/RS-232电源
  • 医疗装置
  • 过程控制
  • 变压器驱动器
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
MAX2532.5640.2Push-Pull3500.45
µMAX/8
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
-55 to +125
-40 to +85
0 to +70
$1.49 @1k
数据手册DataSheet
英文MAX253.pdfRev 3; 04/2015
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
MAX253C/D生产中DICE SALES,;NA引脚;DICE;参考数据资料
MAX253CPA最后一次购买MAX253CPA+PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:否
MAX253CPA+生产中PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:无铅
MAX253CSA生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:否
MAX253CSA+生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX253CSA+T生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX253CSA-T生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:否
MAX253CUA生产中µMAX,;8引脚;15.6mm²0°C至+70°CRoHS/无铅:否
MAX253CUA+生产中µMAX,;8引脚;15.6mm²0°C至+70°CRoHS/无铅:无铅
MAX253CUA+T生产中µMAX,;8引脚;15.6mm²0°C至+70°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?
MAX253CUA-T生产中µMAX,;8引脚;15.6mm²0°C至+70°CRoHS/无铅:否
MAX253EPA生产中PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:否
MAX253EPA+生产中PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:无铅
MAX253ESA最后一次购买MAX253ESA+SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX253ESA+生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX253ESA+T生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX253ESA-T最后一次购买MAX253ESA+TSOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX253ESA/V+NRNDSOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX253ESA/V+TNRNDSOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX253EUA生产中MAX253CUAµMAX,;8引脚;15.6mm²0°C至+70°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?
MAX253EUA+生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX253EUA+T生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX253EUA-T停止供货MAX253CUAµMAX,;8引脚;15.6mm²0°C至+70°CRoHS/无铅:否
MAX253MJA生产中CDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX253MSA/PR生产中SOIC(N),;8引脚;30.9mm²-55°C至+125°CRoHS/无铅:否
MAX253MSA/PR-T停止供货N.SO;-55°C至+125°C参考数据资料
MAX253.pdf MAX253
MAX253.pdf MAX253
MAX253.pdf MAX253
Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface MAX5492
Reduce the Chances of Human Error: Part 1, Power and Ground MAX5481
Oops...Practical ESD Protection vs. Foolhardy Placebos MAX13362
RS-485 Data Interface Gives Isolated, Full-Duplex Operation MAX485E
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Practical Aspects of EMI Protection MAX4506
Push-Pull Driver Provides Isolated 5V at 1A MAX253
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MAX253.pdf MAX253
MAX253.pdf MAX253