(ACTIVE) 300mA High-Voltage Ultra-Low-Iq Low-Dropout (LDO) Regulator


Functional diagram


In automotive battery-connected applications, low quiescent current (IQ) is important to save power and extend battery lifetime. It is especially necessary to have ultralow IQ for always-on systems.

The TPS7B82-Q1 is a low-dropout linear regulator designed for up to 40-V VIN applications. With only 2.7-µA typical quiescent current at light load, it is an optimal solution for powering microcontrollers and CAN/LIN transceivers in standyby systems.

The device features integrated short-circuit and overcurrent protection. This device operates in ambient temperatures from –40°C to 125°C and with junction temperatures from –40°C to 150°C. Additionally, this device uses a thermally conductive package to enable sustained operation despite significant dissipation across the device. Because of these features, the device is well suited as a power supply for various automotive applications.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C3B
  • Device Junction Temperature Range:
    –40°C to 150°C
  • 3-V to 40-V Wide VIN Input Voltage Range With up to 45-V Transient
  • Maximum Output Current: 300 mA
  • Low Quiescent Current IQ:
    • 300 nA Typical When EN = Low
      (Shutdown Mode)
    • 2.7 µA Typical at Light Loads
    • 5 µA Maximum at Light Loads
  • 2% Output-Voltage Accuracy
  • Maximum Dropout Voltage: 700 mV at 200-mA Load Current for Fixed 5-V Output Version
  • Stable With Low-ESR (0.001-Ω to 5-Ω) Ceramic Output-Stability Capacitor (1 µF to 200 µF)
  • Fixed 5-V and 3.3-V Output Voltage
  • Integrated Fault Protection:
    • Thermal Shutdown
    • Short-Circuit and Overcurrent Protection
  • Thermal Resistance (RθJA): 63.9°C/W
  • 8-Pin MSOP Package

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Iout (Max) (A) 0.3   
Output Options Fixed Output   
Vin (Min) (V) 3   
Vin (Max) (V) 40   
Fixed Output Options (V) 5   
Vout (Min) (V) 5   
Vout (Max) (V) 5   
Iq (Typ) (mA) 0.003   
Vdo (Typ) (mV) 400   
Accuracy (%) 2   
PSRR @ 100KHz (dB) 25   
Output Capacitor Type Ceramic   
Rating Automotive   
Operating Temperature Range (C) -40 to 150   
Pin/Package 8MSOP-PowerPAD   

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