New Industry Products

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

April 04, 2018 by Paul Shepard

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 from Texas Instruments 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. Typical applications include: cluster power supply, body control modules, always-ON battery-connected applications such as gateway applications and remote keyless entry systems, and powering MCUs and CAN/LIN transceivers.

Functional block diagram (click on image to enlarge)

A complete list of features includes:

  • 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)
    • 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