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: –40 V to +45 V

– Operating range: 3 V to 40 V

? Output voltage:

– Wide operating range: 2 V to 40 V

– Output voltage flexibility: VOUT can be scaled

to values that are higher or lower than the

reference using external resistors in a voltage

divider configuration

? Maximum output current: 70 mA

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

? Low dropout voltage: 225 mV (max) at 70 mA

? Combined enable and reference functionalities

? Low quiescent current at light load: 60 μA

? Stable over a wide range of ceramic output

capacitor values:

– COUT range: 1 μF to 100 μF

– ESR range: 1 mΩ to 2 Ω

? Integrated protection features:

– Reverse current protection

– Reverse polarity protection

– Overtemperature protection

– Protection against output short circuit to ground

and supply

? Available in the following low thermal resistance

8-pin packages :

– HSOIC (DDA), RθJA = 53.3°C/W

– SOIC (D), RθJA = 101°C/W

2 Applications

? Powertrain pressure sensors

? Powertrain temperature sensors

? Powertrain exhaust sensors

? Powertrain fluid concentration sensors

? Body control modules (BCM)

3 Description

The TPS7B4256-Q1 is a monolithic, integrated,

low-dropout (LDO) voltage tracker. The device is

available in 8-pin SOIC and HSOIC packages. The

TPS7B4256-Q1 is designed to provide power supply

to off-board sensors in an automotive environment.

Because the risk of failure in cables that deliver

off-board power is high, the device comes with

integrated protection features against fault conditions

such as short to battery, reverse polarity, output

short to ground (current limit), and overtemperature

(thermal shutdown). The device incorporates a backto-

back PMOS topology that eliminates the need for

an external diode that is otherwise required to help

protect against fault conditions that result in flow of

reverse current. The device is designed to handle a

45-V (absolute maximum) input voltage and survive

the automotive load dump transient conditions.

A reference voltage applied at the adjustable input

pin (ADJ/EN) is tracked with a very tight 6 mV

(max) tolerance at the FB pin across temperature.

This tracking enables the TPS7B4256-Q1 to deliver

a power-supply voltage with high precision for loads

up to 70 mA. The reference voltage can be directly

connected to the ADJ/EN pin or scaled down to lower

values with the help of an external resistor divider

at the ADJ/EN pin to a minimum of 2 V. The output

voltage can be made equal to the voltage at the

ADJ/EN pin (± the tracking tolerance) by tying the FB

pin directly to the OUT pin or scaled to higher values

with the help of a resistive voltage divider between the

FB and the OUT pin.