• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

The TPS22949 and TPS22949A are devices that provides protection to systems and loads in high-current conditions. The device contains a 500-m current-limited P-channel MOSFET that can operate over an input voltage range of 1.62 V to 4.5 V as well as a low-dropout (LDO) regulator with a fixed output voltage of 1.8 V.

The switch is controlled by an on/off input (EN1), which is capable of interfacing directly with low-voltage control signals. When the switch current reaches the maximum limit, the TPS22949/TPS22949A operates in a constant-current mode to prohibit excessive currents from causing damage. If the constant current condition still persists after 12 ms, these devices shut off the switch and pull the fault signal pin (OC) low.

特性

• Integrated Current Limiter
  • Input Voltage Range: 1.62 V to 4.5 V
  • Low ON-Resistance
    r_ON = 300-m at V_IN = 4.5 V
    r_ON = 350-m at V_IN = 3.3 V
    r_ON = 400-m at V_IN = 2.5 V
    r_ON = 600-m at V_IN = 1.8 V
  • Integrated 100-mA Minimum Current Limit
  • Undervoltage Lockout
  • Fast-Current Limit Response Time
  • Integrated Fault Blanking and Auto Restart
• Stable Without Current Limiter Output Capacitor (TPS22949A Only)
• Integrated Low-Noise RF LDO
  • Input Voltage Range: 1.62 V to 4.5 V
  • Low Noise: 50 µVrms (10 Hz to 100 kHz)
  • 80-dB V_IN PSRR (10 Hz to 10 kHz)
  • Fast Start-Up Time: 130 µs
  • Low Dropout 100 mV at I_load =100 mA
  • Integrated Output Discharge
  • Stable With 2.2-µF Output Capacitor
• 1.8-V Compatible Control Input Threshold
• ESD Performance Tested Per JESD 22
  • 3500-V Human-Body Model
    (A114-B, Class II)
  • 1000-V Charged-Device Model
    (C101)