ST L9952GXP 汽车电源管理方案

ST 公司的L9952GXP是具有先进的接触监视和外设功能而又包含了两个低压降稳压器的功率管理集成电路,采用标准的24位SPI来控制工作模式,并提供诊断功能. L9952GXP具有视窗看门狗和自动防故障输出以及中断输出,LIN 2.1兼容的收发器. L9952GXP还集成了5个高边驱动器,2个继电器驱动器,并具有短路保护功能以及温度告警和热关断特性.此外还集成了用于地线电流检测的2个运放. L9952GXP主要用在汽车ECU如门区和车体控制模块.本文介绍了L9952GXP主要特性,方框图和标准系统配置图以及车门模块分割方框图.

The L9952GXP is a power management system IC containing two low drop regulators with advanced contact monitoring and additional peripheral functions.

The integrated standard serial peripheral interface (SPI) controls all L9952GXP operation modes and provides driver diagnostic functions.

L9952GXP主要特性:

■ Two 5V low-drop voltage regulators (250mA, 100mA continuous mode)

■ Low stand-by current: VBAT stby, 7μA; ,V1 stby, 45μA, (75μA in cycl. sense)

■ Window watchdog and fail-safe output

■ Interrupt output

■ Wake-up logic with cyclic contact monitoring

■ LIN 2.1 compliant (SAEJ2602 compatible) transceiver

■ 24 bit SPI interface for mode control and diagnostic

■ Output drivers

■ 4 High side drivers for e.g. LED or HALL (RDSon,typ = 7.)

■ 1 High side driver Out_HS ( RDSon,typ = 1.)

■ 2 Relay drivers ( RDSon,typ = 2.)

■ Outputs are short circuit protected

■ 2 Op amps for current sensing in GND return lines

■ Temperature warning and thermal shutdown

L9952GXP应用:

■ Automotive ECU’ s such as door zone and body control modules.

图1.L9952GXP方框图(1)

图2.L9952GXP内部方框图(2)

图3.L9952GXP标准系统配置图

图4.L9952GXP车门模块分割方框图