TPS7B4254-Q1 Datasheet, PDF (1/26 Pages) Texas Instruments – 150-mA 40-V Voltage-Tracking LDO With 4-mV Tracking Tolerance

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TPS7B4254-Q1
SLVSDI1B – APRIL 2016 – REVISED JUNE 2016
TPS7B4254-Q1 150-mA 40-V Voltage-Tracking LDO With 4-mV Tracking Tolerance
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 3A
– Device CDM ESD Classification Level C6
• –40-V to 45-V Wide Input-Voltage Range
(Maximum)
• Output-Voltage Adjust Range: 2 V to 40 V
• 150-mA Output Current Capability
• Very Low Output-Tracking Tolerance, ±4 mV
• 160-mV Low-Dropout Voltage When I_OUT =
100 mA
• Low Quiescent Current (I_(Q)):
– < 4 µA When ADJ = LOW
– 60 µA Typical at Light Load
• Extremely Wide ESR Range
– 10-µF to 500-µF Ceramic Output Capacitor
– ESR Range from 1 mΩ to 20 Ω
• Reverse Polarity Protection
• Current-Limit and Thermal-Shutdown Protection
• Output Short-Circuit-Proof to Ground and Supply
• Inductive Clamp at OUT Pin
• 8-Pin SO PowerPAD™ Package With Exposed
Thermal Pad
2 Applications
• Off-Board Sensor Supply
• High-Precision Voltage Tracking
• Power Switch for Off-Board Load
3 Description
For automotive off-board sensors and low-current off-
board modules, the power supply is through a long
cable from the main board. In such cases, protection
is required in the power devices for the off-board
loads to prevent the onboard components from
damage during a short to GND or short to battery
caused by a broken cable. Off-board sensors require
a power supply as consistent as that for onboard
components to secure high accuracy of data
acquisition.
The TPS7B4254-Q1 device is designed for
automotive applications with a 45-V load dump. The
device can either be used as one tracking low-
dropout (LDO) regulator or as a voltage tracker to
build one closed power loop for off-board sensors
with an onboard main supply. The output of the
device is accurately regulated by a reference voltage
at the ADJ pin.
To provide an accurate power supply to the off-board
modules, the device offers a 4-mV ultralow tracking
tolerance between the ADJ and FB pins across
temperature. The back-to-back PMOS topology
eliminates the need for an external diode under a
reverse-polarity condition. The TPS7B4254-Q1
device also includes thermal shutdown, inductive
clamp, overload, and short-to-battery protection to
prevent damage to onboard components during
extreme conditions.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS7B4254-Q1
SO PowerPAD (8) 4.89 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
Automotive
Battery
IN
OUT
DC-DC or
LDO
MCU
C_IN
TPS 7B425 4-Q1
ADJ
FB
C_{OU T}
Off-Board
Sensor
ADC
GND
Main Board
Copyright © 2016, Texas Instruments Incorporated
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. PRODUCTION DATA.