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 voltage range:

– Absolute maximum range: –40V to 45V

– Operating range: 3.3V to 40V

• Wide output voltage range: 2V to 40V

• Maximum output current: 150mA

• Very tight output-tracking tolerance: 6mV (max)

• Low dropout voltage: 250mV at 150mA

• Independent enable pin functionality

• Power-good functionality detects under- and

overvoltage conditions

• Low quiescent current at light load: 55μA

• Stable over a wide range of ceramic output

capacitor values:

– COUT range: 1μF to 100μF

– ESR range: 1mΩ to 2Ω

• Integrated protection features:

– Reverse current protection

– Reverse polarity protection

– Overtemperature protection

– Protection against output short circuit to ground

and supply

• Available in a low thermal resistance, 8-pin

package:

– HSOIC (DDA), RθJA = 48℃/W

2 Applications

• Powertrain pressure sensors

• Powertrain temperature sensors

• Powertrain exhaust sensors

• Powertrain fluid concentration sensors

• Body control modules (BCM)

• Zone control modules (ZCM)

• HVAC control modules

3 Description

The TPS7B4259-Q1 is a monolithic, integrated lowdropout

voltage tracker. The device is available

in an 8-pin HSOIC package. The TPS7B4259-

Q1 is designed to reliably provide power to offboard

sensors with a wire harness, even in harsh

automotive environments. In such severe operating

conditions, the cables in the harness are potentially

exposed to various fault conditions, increasing the

risk of failure. Such conditions include short to

ground, short to battery, and overtemperature. The

TPS7B4259-Q1 comes with integrated protection

features against each of these fault conditions,

as well as protection against reverse polarity. The

device incorporates a topology containing two backto-

back P-channel metal-oxide semiconductor fieldeffect

transistors (MOSFETs). This PMOS topology

eliminates the need for an external diode that is

otherwise required to prevent the flow of reverse

current. The high 150mA current rating of the

device potentially allows a single tracker to power

multiple off-board sensors simultaneously. The device

is designed to handle a 45V (absolute maximum)

input voltage and survive the automotive load dump

transient conditions.

The TPS7B4259-Q1 features an independent enable

pin (EN) and power-good functionality that detects

both under- and overvoltage fault conditions. By

setting the EN input pin low, the TPS7B4259-Q1

switches to standby mode. In this mode the quiescent

current consumption of the LDO is less than 3.8μA

(max).