TPS7B63xx-Q1

IN

DELAY

ROSC

WTS

EN

WD_EN

WD

OUT

RADJ

WDO

PG

FSEL

WRS

MCU Supply

Digital Output

MCU I

MCU RESET

MCU O

Battery

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS7B6333-Q1, TPS7B6350-Q1

SLVSDU9A – FEBRUARY 2017 – REVISED MARCH 2017

TPS7B63xx-Q1 300-mA 40-V High-Voltage, Ultralow-Quiescent-Current Watchdog LDO

1

1 Features

1

•

Qualified for Automotive Applications

•

AEC-Q100 Qualified With the Following Results:

–

Device Temperature Grade 1: –40°C to 125°C

Ambient Operating Temperature Range

–

Device HBM ESD Classification Level 2

–

Device CDM ESD Classification Level C4B

•

Maximum Output Current: 300 mA

•

Up to 45-V Transients

•

Fixed 3.3-V and 5-V Outputs

•

Maximum Dropout Voltage: 400 mV at 300 mA

•

Stable With Output Capacitor in Wide Range of

Capacitance (4.7 µF to 500 µF) and ESR (0.001 Ω

to 20 Ω)

•

–

< 4 µA When EN Is Low (Shutdown Mode)

–

19 µA Typical at Light Loads With WD_EN

High (Watchdog Disabled)

•

Configurable for Window Watchdog or Standard

Watchdog

•

Open-to-Closed Window Ratio Configurable as

1:1 or 8:1

•

Fully Adjustable Watchdog Period (From 10 ms to

500 ms)

•

9% Accurate Watchdog Period

•

Dedicated WD_EN Pin to Control Watchdog ON-

OFF

•

Fully Adjustable Power-Good Threshold and

Power-Good Delay Period

•

Low Input-Voltage Tracking to UVLO

•

Integrated Fault Protection

–

Overload Current-Limit Protection

–

Thermal Shutdown

•

16-Pin HTSSOP Package

2 Applications

•

Automotive MCU Power Supply

•

Body Control Modules (BCM)

•

Body Comfort Modules

•

EV and HEV Battery Management Systems

(BMS)

•

Electronic Gear Shifter

•

Transmission Control Unit (TCU)

•

Electrical Power Steering (EPS)

3 Description

In

automotive

microcontroller

or

microprocessor

power-supply applications, the watchdog is used to

monitor the microcontroller working status to prevent

software runaway. It is necessary for the watchdog to

be independent of the microcontroller in a reliable

system.

The TPS7B63xx-Q1 device is a family of 300-mA

watchdog LDOs designed for an operating voltage up

to 40 V, with typical quiescent current of only 19 µA

at light load. The devices integrate a programmable

function for selecting a window watchdog or standard

watchdog, with an external resistor to set the

watchdog time within 9% accuracy.

The PG pin on the TPS7B63xx-Q1 devices indicate

when the output voltage is stable and in regulation.

The

power-good

delay

period

and

power-good

threshold can be adjusted by selecting external

components. The devices also feature integrated

short-circuit

and

overcurrent

protection.

The

combination of such features makes these devices

particularly

flexible

and

suitable

to

supply

microcontroller in automotive applications.

Device Information(1)

PART NUMBER

OUTPUT VOLTAGE

PACKAGE

TPS7B6333-Q1

Fixed 3.3 V

HTSSOP (16)

TPS7B6350-Q1

Fixed 5 V

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic