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 operating voltage range (3 V to 40 V):

– Absolute maximum input voltage range:

–40 V to +45 V

? Wide output voltage range: 2 V to 40 V

? Maximum output current: 70 mA

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

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

? Combined reference and enable functionalities

? Low quiescent current at light load: 35 μA

? Wide COUT and ESR range:

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

capacitor, 1-mΩ to 3-Ω ESR

? Integrated protection features:

– Reverse current protection

– Reverse polarity protection

– Overtemperature protection

– Protection against output short-circuit to ground

and supply

? Available in two 5-pin SOT-23 packages:

– Standard SOT-23 (DBV)

– Thermally enhanced SOT-23 (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. Because the risk of failure in

cables that deliver off-board power is high, the device

comes with integrated protection features against fault

conditions such as reverse current (short to battery),

reverse polarity, output short to ground (current limit),

and overtemperature (thermal shutdown). The device

is designed to handle a 45-V (absolute maximum)

input voltage and survive the automotive load dump

transient conditions.

A reference voltage applied at the ADJ/EN pin is

effectively tracked at the OUT pin with very tight

tolerance for loads up to 70 mA. The TPS7B4255-Q1

can therefore deliver the power-supply voltage to the

off-board sensors with high precision, which can help

improve the reliability and accuracy of measurements

made using ratiometric sensors.

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

Q1 switches to standby mode and reduces the

quiescent current of the LDO to less than 3.25 μA.