1 Features

• Wide input operating voltage range (3 V to 40 V):

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

• Wide output voltage range: 2 V to 30 V

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

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

• Reverse polarity protection

• Reverse current protection

• Combined reference and enable input

• Low quiescent current at light loads (100-μA load):

– 50 μA (max)

• Wide ESR range:

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

capacitor, 1-mΩ to 3-Ω ESR

• Overtemperature protection

• Output short-circuit protection to ground and

supply

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

• Available in 5-pin SOT-23 DBV package

• Buffers signals up to 1 kHz (see the Signal-

Buffering LDO section)

2 Applications

• Condition monitoring sensors

• Motion detectors (PIR, uWave, and so forth)

• Wired controls

• Telemetry and RTUs

• Robot sensing modules

3 Description

The TPS7B4255 is a low-dropout (LDO) voltagetracking

regulator, with high tracking accuracy and

excellent load and line transient response. The device

is available in a 5-pin, SOT-23 (DBV) package. The

TPS7B4255 is designed to supply off-board sensors

in industrial applications such as condition monitoring

sensor systems. The device provides integrated

protection features such as reverse polarity, output

short to supply and ground, 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 survive a 45-V (absolute maximum) input

voltage during extreme transient events.

A reference voltage applied at the ADJ/EN pin is

effectively tracked with high accuracy for loads up to

70 mA. The high tracking accuracy provides accurate

power supply to off-board modules and enables

better accuracy when making measurements using

ratiometric sensors.

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

switches to standby mode and reduces the quiescent

current to the minimum value.