1 Features

• AEC-Q100 qualified for automotive applications:

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

– Junction temperature: –40°C to +150°C, TJ

• Wide input voltage range (–40 V to +40 V):

– Absolute maximum input range: –40 V to +45 V

• Wide output voltage range: 2 V to 40 V

• Very-tight, output-tracking tolerance: 5 mV (max)

• Low dropout voltage: 500 mV (max) at 70 mA

• Reverse polarity protection

• Reverse current protection (short to battery)

• Combined reference and enable input

• Low quiescent current at light load: 35 μA

• Extreme, wide ESR range:

– Stable with 1-μF to 200-μF ceramic output

capacitor, 1-mΩ to 3-Ω ESR

• Overtemperature protection

• Output short-circuit proof to ground and supply

• Packages: 5-pin, SOT-23 DBV and DYB

2 Applications

• Powertrain pressure sensors

• Powertrain temperature sensors

• Powertrain exhaust sensors

• Powertrain fluid concentration sensors

• Body control modules (BCM)

3 Description

The TPS7B4255-Q1 is a low-dropout (LDO) voltagetracking

regulator, with high tracking accuracy and

excellent load and line transient response. The device

is available in two 5-pin, SOT-23 packages (DBV

and DYB). The TPS7B4255-Q1 is designed to supply

off-board sensors in automotive applications such as

powertrain systems. The device provides integrated

protection features such as reverse polarity, output

short to battery and ground, and current limit and

thermal shutdown to protect against the high risk

of cable failures in an off-board power system. The

device is designed to maintain a 45-V (absolute

maximum) input voltage to sustain the load dump

transient conditions.

A reference voltage applied at the ADJ/EN pin

effectively buffers the voltage with high accuracy

for loads up to 70 mA. The high tracking

accuracy provides accurate power supply to the offboard

modules and enables better accuracy when

measuring ratiometric sensors.

By setting the ADJ/EN input pin low, the TPS7B4255-

Q1 switches to standby mode and reduces the

quiescent current to the minimum value.