For automotive external sensors and small current external modules, power is supplied through long cables from the motherboard. In this case, off-board loads need to be protected in the power devices to prevent damage to the on-board components in the event of a short circuit to ground or a short circuit to the battery due to cable damage. Off-board sensors require a consistent power supply as an on-board component to ensure high accuracy of data acquisition.

The TPS7B4253QDDARQ1 device is designed for automotive applications with 45V load sag. The device can be used as a tracking low dropout (LDO) regulator or voltage tracker to create a closed power loop for off-board sensors with an on-board mains supply. The output of the device is precisely regulated by a reference voltage on the ADJ pin.

To provide accurate power to the off-board module, the device provides an ultra-low tracking tolerance of 4mV between the ADJ and FB pins. The back-to-back PMOS topology eliminates the need for external diodes under reverse polarity conditions.The TPS7B4253QDDARQ1 devices also include thermal shutdown, sense clamp, overload, and battery short circuit protection to prevent damage to on-board components under extreme conditions.

Features: TPS7B4253QDDARQ1

Meets Automotive Application Requirements

AEC-Q100 meets the following results:

Device Temperature Class 1: -40°C to +125°C Ambient Operating Temperature Range

Device HBM ESD Classification Level 3A

Device CDM ESD Classification Level C6

-40 to 45V Wide input voltage range (maximum)

Output voltage down to:

1.5 to 40 V (HTSSOP)

2 to 40 V (SO PowerPAD™)

300mA output current capability

Very low output tracking tolerance, ±4 mV

Low dropout voltage of 320 mV at IOUT = 200 mA

Separate pins for enabling and tracking inputs (HTSSOP only)

Low quiescent current (IQ):

< 4 μA when EN = low

60 μA at light load (typical)

Extremely wide ESR range.

Stable with 10 to 500 μF ceramic output capacitors, ESR 1 mΩ to 20 Ω

Reverse polarity protection

Current limiting and thermal shutdown protection

Output short-circuit protection to ground and power

Inductive clamp at OUT pin

Available in the following packages:

8-pin SO PowerPAD package

20-pin HTSSOP package

Primary Application:

Off-board sensor power supplies

High-accuracy voltage tracking

Power switching for off-board loads

LDO Parallel Solution Evaluation Board with TPS7B4253-Q1