Description:

In automotive battery connection applications, low quiescent current (IQ) is critical for power saving and extending battery life. Always-on systems must feature ultra-low IQ over an extended temperature range to enable sustained operation when the vehicle ignition is off. The TPS7B81-Q1 is a low-dropout (LDO) linear regulator designed for VIN applications up to 40V. With a typical quiescent current of only 2.7µA at light loads, this device is an excellent choice for powering microcontrollers and CAN/LIN transceivers in standby systems. These devices feature integrated short-circuit and overcurrent protection. The device operates over an ambient temperature range of –40°C to +125°C and a junction temperature range of –40°C to +150°C. Additionally, the device is offered in several thermally conductive packages with different sizes. The compact WSON package offers a wettable-flank option. The TO-252 package also helps sustain operation even when the device dissipates significant heat. These features make the device an ideal power supply for a wide range of battery-connected automotive applications.

Features:

• AEC-Q100 qualified for automotive applications:

– Temperature Grade 1: –40°C to +125°C, TA

– Temperature Grade 1: –40°C to +150°C, TJ

• Wide VIN input voltage range: 3V to 40V, with 45V transient capability

• Maximum output current: 150mA

• Low quiescent current IQ:

– 300nA typical (shutdown mode, EN = low)

– 2.7µA typical at light loads

– 4.5µA maximum at light loads

• Output voltage accuracy of 1.5% across line, load, and temperature

• Maximum dropout voltage: 540mV at 150mA load current (for fixed 5V output version)

• Stable with low-ESR (0.001Ω to 5Ω) ceramic output capacitors (1µF to 200µF)

• Fixed output voltages: 5V, 3.3V, and 2.5V

• Integrated fault protection:

– Thermal shutdown

– Short-circuit and overcurrent protection

• Functional safety capable

– Documentation available to aid in the design of functional safety systems

• Packages:

– DGN (8-pin HVSSOP), RθJA = 63.9°C/W

– DRV (6-pin WSON), RθJA = 72.8°C/W

– DRV (6-pin WSON with wettable flank), RθJA = 72.8°C/W

– KVU (5-pin TO-252), RθJA = 38.8°C/W

Applications:

• Automotive head units

• Headlamps

• Battery Management Systems (BMS)

• Inverters and motor control