TPS7B6833-Q1 Datasheet, PDF (1/8 Pages) Texas Instruments – 500-mA 40-V High-Voltage Ultralow Quiescent-Current Watchdog LDO

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TPS7B6833-Q1, TPS7B6850-Q1
SLVSD43 – MAY 2015
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 H2
– Device CDM ESD Classification Level C3B
• 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)
– 24 µA Typical at Light Loads With WD_EN
High (Watchdog Disabled)
• Configurable for Window or Standard Watchdog
• Open-and-Close Window Ratio 1:1 or 8:1
Configurable
• Fully Adjustable Watchdog Period (From 10 ms to
500 ms)
• 9% Accurate Watchdog Period Across
Temperature
• Dedicated WD_EN Pin to Control Watchdog ON-
OFF
• Fully Adjustable Power-On Reset Threshold and
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
• Body Comfort Modules
• EV and HEV Battery Monitor Systems
• Electronic Gear Shifter
• Transmission
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 is a family of 500-mA watchdog
LDOs designed for an operating voltage up to 40 V,
with typical quiescent current of only 24 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
TPS7B6833-Q1
TPS7B6850-Q1
OUTPUT VOLTAGE
(V_O)
Fixed 3.3 V
Fixed 5 V
PACKAGE
HTSSOP (28)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Schematic
Battery
TPS7B6850-Q1
IN
OUT
MCU
Supply
EN
MCU I/O
MCU I/O
WD_EN
WD
WTS
ROSC
DELAY
PGADJ
WDO
PG
FSEL
WRS
MCU
I/O
MCU
Reset
GND
1
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. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.