TPS7B4253-Q1_15 Datasheet, PDF (10/31 Pages) Texas Instruments – TPS7B4253-Q1 300-mA 40-V Low-Dropout Voltage-Tracking LDO With 4-mV Tracking Tolerance

TPS7B4253-Q1
SLVSCP3A – JANUARY 2015 – REVISED AUGUST 2015
7 Detailed Description
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7.1 Overview
The TPS7B4253-Q1 device is a monolithic integrated low-dropout voltage tracker with an ultralow tracking
tolerance. Key protection circuits are integrated in the device, including output current limitation, reverse polarity
protection, inductive load clamp, output short-to-battery protection, and thermal shutdown in case of an
overtemperature event.
7.2 Functional Block Diagram
IN
V(BAT)
EN
ADJ
Vref
Reverse
Current
Protection
UVLO
Thermal
Shutdown
Internal
Supply
Logic
Control
OUT
Load
Current
Limit
±
FB
GND
7.3 Feature Description
7.3.1 Short Circuit and Overcurrent Protection
The TPS7B4253-Q1 device features integrated fault protection which makes the device ideal for automotive
applications. To keep the device in a safe area of operation during certain fault conditions, internal current-limit
protection is used to limit the maximum output current. This protection protects the device from excessive power
dissipation. For example, during a short-circuit condition on the output, the current through the pass element is
limited to I_O(lim) to protect the device from excessive power dissipation.
7.3.2 Integrated Inductive Clamp Protection
During output turnoff, the cable inductance continues to source the current from the output of the device. The
device integrates an inductive clamp at the OUT pin to help to dissipate the inductive energy stored in the cable.
An internal diode is connected between the OUT and GND pins with a DC-current capability of 600 mA for
inductive clamp protection.
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