SLVSCP3C January   2015  – July 2016 TPS7B4253-Q1


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Short Circuit and Overcurrent Protection
      2. 7.3.2 Integrated Inductive Clamp Protection
      3. 7.3.3 OUT Short to Battery and Reverse Polarity Protection
      4. 7.3.4 Undervoltage Shutdown
      5. 7.3.5 Thermal Protection
      6. 7.3.6 Regulated Output (OUT)
      7. 7.3.7 Enable (EN)
      8. 7.3.8 Adjustable Output Voltage (FB and ADJ)
        1. OUT Voltage Equal to the Reference Voltage
        2. OUT Voltage Higher Than Reference Voltage
        3. Output Voltage Lower Than Reference Voltage
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation With VIN < 4 V
      2. 7.4.2 Operation With EN Control
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application With Output Voltage Equal to the Reference Voltage
        1. Design Requirements
        2. Detailed Design Procedure
          1. Input Capacitor
          2. Output Capacitor
        3. Application Curve
      2. 8.2.2 High-Side Switch Configuration
      3. 8.2.3 High Accuracy LDO
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation and Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resource
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 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 to 45-V Wide Input-Voltage Range (Maximum)
  • Output Voltage Adjusts Down to:
    • 1.5 to 40 V (HTSSOP)
    • 2 to 40 V (SO PowerPAD™)
  • 300-mA Output Current Capability
  • Very-Low Output Tracking Tolerance, ±4 mV
  • 320-mV Low Dropout Voltage when IOUT = 200 mA
  • Separate Pins for Enable and Tracking Inputs (HTSSOP only)
  • Low Quiescent Current (IQ):
    • < 4 µA when EN = LOW
    • 60 µA (Typical) at Light Loads
  • Extremely Wide ESR Range.
    • Stable With 10- to 500-µF Ceramic Output Capacitor, ESR 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
  • Available in the Following Packages:
    • 8-Pin SO PowerPAD Package
    • 20-Pin HTSSOP Package

2 Applications

  • Off-Board Sensor Supply
  • High-Precision Voltage Tracking
  • Power Switch for Off-Board Load

3 Description

For automotive off-board sensors and small 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 consistent power supply as onboard components to secure high accuracy of data acquisition.

The TPS7B4253-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 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 reverse polarity condition. The TPS7B4253-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)

TPS7B4253-Q1 SO PowerPAD (8) 4.89 mm × 3.90 mm
HTSSOP (20) 6.50 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

TPS7B4253-Q1 alt_slvscp3.gif

4 Revision History

Changes from B Revision (January 2016) to C Revision

  • Changed the following parameters in the Recommended Operating Conditions table to show values for HTSSOP and SO PowerPAD packages: VADJ, VFB, and VOUT Go
  • Corrected the Functional Block DiagramGo
  • Added the HTSSOP package as the example for the Application With Output Voltage Equal to the Reference Voltage sectionGo
  • Corrected the Output Voltage Equals the Reference Voltage figureGo
  • Added the Receiving Notification of Documentation Updates section Go

Changes from A Revision (August 2015) to B Revision

  • Changed the note for the reference voltage minus the input voltage parameter in the Absolute Maximum Ratings table Go
  • Added values for the SO PowerPAD package for the adjust signal valid parameters in the Electrical Characteristics tableGo
  • Changed the test condition for the adjust high signal valid parameter in the Electrical Characteristics tableGo

Changes from * Revision (January 2015) to A Revision

  • Changed the device status from Product Preview to Production DataGo