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.