TPS7B6833-Q1_17 Datasheet, PDF (1/32 Pages) Texas Instruments – 500-mA 40-V High-Voltage Ultralow Quiescent-Current Watchdog LDO

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TPS7B6833-Q1, TPS7B6850-Q1
SLVSD43A – MAY 2015 – REVISED DECEMBER 2016
TPS7B68xx-Q1 500-mA 40-V High-Voltage Ultralow Quiescent-Current Watchdog LDO
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: 500 mA
• 4-V to 40-V Wide V_IN Input-Voltage Range With
Up to 45-V Transients
• Fixed 3.3-V and 5-V Outputs
• Maximum Dropout Voltage: 600 mV at 500 mA
• Stable With Output Capacitor in Wide-Range of
Capacitance (4.7 µF to 500 µF) and ESR (0.001 Ω
to 20 Ω)
• Low Quiescent Current (I_(Q))
– < 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
• 28-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)
1
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 TPS7B68xx-Q1 device is a family of 500-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 or standard watchdog,
with an external resistor to set the watchdog time
within 9% accuracy.
The PG pin on the TPS7B68xx-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 external components.
The devices also feature an integrated short-circuit
and overcurrent protection. The combination of such
features makes these devices particularly flexible and
suitable to supply microcontroller systems in
automotive applications.
Device Information⁽¹⁾
PART NUMBER OUTPUT VOLTAGE
PACKAGE
TPS7B6833-Q1
TPS7B6850-Q1
Fixed 3.3 V
Fixed 5 V
HTSSOP (28)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
Battery
TPS7B6850-Q1
IN
OUT
MCU
Supply
EN
WD_EN
Digital I/O
MCU I/O
WD
WTS
ROSC
DELAY
PGADJ
WDO
PG
FSEL
WRS
MCU
I/O
MCU
Reset
GND
Copyright © 2016, Texas Instruments Incorporated
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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.