Maxim MAX15157B 60V电流模式降压控制器解决方案
Maxim公司的MAX15157B属于MAX15157 4开关降压-升压控制器系列产品,驱动半桥降压配置连接的两个外接MOSFET,输出电压通过1V到2.2V基准输入(REFIN)动态设定,支持模块化设计.开关频率可通过外接电阻设定内部振荡器频率来控制或和外部时钟同步来调整.器件支持120kHz到1MHz的开关频率,控制器具有专用的欠压锁住引脚(UVLO)和精确的使能输入阈值,以便灵活进行加电顺序配置.控制器具有多种故障保护电路以防止过流(OCP),输出过压(OVP),输入UVLO和热关断. MAX15157B具有可调整内部补偿斜率,器件采用精确的电流检测放大器,通过模拟输出(IMON)报告输出电流.器件允许单相或多相(多达四相)操作.器件输入电压从8V到60V,输出电压从3V到56V,采用5mmx5mm 32引脚TQFN封装,工作温度-40C 到 +125C.主要用在通信,工业和汽车电子.本文介绍了MAX15157B主要优势和特性,框图, 典型应用电路图和标准应用电路图, 单相降压转换器电路图以及评估板MAX15157B EVK主要特性,电路图,材料清单和PCB设计图.
The MAX15157B belongs to the family of MAX151574-switch, buck–boost controllers. MAX15157B drives twoexternal MOSFETs in half-bridge buck configuration. Theoutput voltage can be dynamically set through the 1V to2.2V reference input (REFIN) for modular design support.
The switching frequency is controlled either through anexternal resistor that sets the internal oscillator frequency,or by synchronizing the regulator to an external clock.
The device is designed to support 120kHz to 1MHzswitching frequencies. The controller has a dedicatedundervoltage-lockout pin (UVLO) and an accurate enableinputthreshold for flexible power-sequence configuration.
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