Features

• Qualified for Automotive Applications

– AEC-Q100 Grade 1, TA: −40°C to +125°C

– Junction Temperature, TJ: −40°C to +150°C

• Input Voltage: 4 V to 42 V, with 45-V Transient

• Output Voltage:

– Fixed 5 V and 3.3 V

• ±2% Output Accuracy over Line Regulation, Load

Regulation, and Operating Temperature Range

• 500-mA Maximum Output Current

• Low Dropout Voltage: 800-mV maximum at 500-mA

Load Current

• Low Current Consumption:

– 0.5-μA Typical Shutdown Current (EN = LOW)

– 6-μA Typical Quiescent Current (nWDEN = VOUT)

• Window and Standard Watchdog Configurable

– Open/Closed Window Ratio 1:1 or 8:1 Configurable

– Adjustable Watchdog Period from 10 ms to 2 s

– Accurate Watchdog Period: ±10% Maximum when

tWD ≤ 500 ms

– nWDEN Pin to Turn On or Turn Off the Watchdog

Function

• Adjustable Power-Good Threshold

• Adjustable Power-Good Delay Period

• Stable with 4.7-μF to 500-μF Output Capacitor with

ESR Range from 0.001 Ω to 20 Ω

• Integrated Protection:

– Over-Current Protection

– Over-Temperature Protection

• Package Option:

– ETSSOP28

Applications

• Automotive Clusters and Infotainment

• Automotive BCM and HVAC System

• Automotive Electric Gear Shifter

• Automotive Battery Management System

Description

The TPL8556Q series comprises wide-input LDO products

with an integrated watchdog timer, capable of delivering up

to 500 mA. These devices can operate within a voltage

range from 4 V to 42 V, with a maximum transient voltage

of 45 V. Their ability to function reliably with a minimum

voltage of 4 V makes them suitable for cold-crank and

start-stop scenarios.

The TPL8556Q series offers 5-V and 3.3-V fixed output

voltage options, with a maximum shutdown current of

only 2 μA. When the watchdog function is disabled, these

devices have a low typical quiescent current of just 6 μA.

The TPL8556Q series features the window watchdog

and the standard watchdog with an accurate watchdog

period. The watchdog period, the window ratio, and the

power-good reset threshold are fully adjustable through

external configuration. Furthermore, these devices include

integrated over-current and over-temperature protection.

In terms of output capacitors, the TPL8556Q series is

compatible with a broad range from 4.7 μF to 500 μF with

an ESR range spanning from 0.001 Ω to 20 Ω.

With the features above, the TPL8556Q series is an ideal

power supply for microprocessors in a reliable system.

The TPL8556Q series of products operate in the ambient

temperature range from –40°C to +125°C. Additionally,

the TPL8556Q series provides a thermal-enhanced

ETSSOP28 package to enable sustained operation despite

significant dissipation across the device