SBVS474 November   2026 TPS7B7801-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics 
    6. 5.6 Timing Requirements - I2C Standard Mode
    7. 5.7 Timing Requirements - I2C Fast Mode
    8. 5.8 Timing Requirements - I2C Fast Mode Plus
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Input Under-Voltage Lockout (UVLO)
      2. 6.3.2  Enable
      3. 6.3.3  Output Voltage Setting
      4. 6.3.4  Soft Start
      5. 6.3.5  Voltage Monitoring
      6. 6.3.6  Current Monitoring
      7. 6.3.7  Reverse Current Protection
      8. 6.3.8  Current Limit
      9. 6.3.9  Junction Temperature Monitoring
      10. 6.3.10 Thermal Protection
      11. 6.3.11 Protection Features and Diagnostic Capabilities
      12. 6.3.12 NERR Pin
      13. 6.3.13 Blanking Time
      14. 6.3.14 Switch Mode
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout
      3. 6.4.3 Operation with VIN < 4.5V
      4. 6.4.4 Disable
    5. 6.5 Programming
      1. 6.5.1 I2C Interface
        1. 6.5.1.1 I2C Interface Speed
      2. 6.5.2 I2C Data Transfer Protocol
        1. 6.5.2.1 START and STOP
        2. 6.5.2.2 Logical 1's and 0's
        3. 6.5.2.3 Data Format
      3. 6.5.3 Address Frame
      4. 6.5.4 Write Cycle
      5. 6.5.5 Read Cycle
  8. 7 Register Map
    1. 7.1 Default Settings
    2. 7.2 Register Details
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input and Output Capacitor Selection
        2. 8.2.2.2 Adjustable Device Feedback Resistor Selection
        3. 8.2.2.3 Feed-Forward Capacitor
        4. 8.2.2.4 Power Dissipation (PD)
        5. 8.2.2.5 Estimating Junction Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
      2. 9.1.2 Development Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1.     80

Package Options

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

3 Description

The TPS7B7801-Q1 is a monolithic high voltage low drop-out regulator with an integrated ADC and I2C interface. The device has a wide input voltage operating range, and can protect against a 45V input voltage load dump scenario. This device is an excellent choice to power remotely located LNAs (associated with AM/FM/GNSS antenna), microphone and camera modules over coax cables. In harsh automotive environments, coax cables are potentially exposed to various fault conditions, increasing risk of failure. Such conditions include short to ground, short to battery, and overtemperature. TPS7B7801-Q1 comes with integrated protection features against each of these fault conditions, as well as protection against reverse polarity. The device incorporates a topology containing two back-to-back P-channel metal-oxide semiconductor field-effect transistors (MOSFETs). This PMOS topology eliminates the need for an external diode that is otherwise required to prevent the flow of reverse current. The device can provide up to 300mA of output current and an adjustable output voltage from 2V to 40V.

This device can uniquely identify and diagnose several fault conditions. User can infer to this diagnosis information from a register via I2C communication and the error pin. The integrated 10-bit ADC allows the user to continuously monitor the input voltage, output voltage, junction temperature and load current. The device features a high accuracy current sense circuitry across the current range (≤ ±12.5% for 1mA to 23.5mA, and <±9.5% for >75mA). This feature allows the device to precisely detect and distinguish between open, normal and short-circuit conditions without further calibration. This device also offers adjustable current limit, that can be set using I2C communication.

This device operates over −40°C to +125°C ambient temperature range and is available in a 4.0mm × 4.0mm, 20-pin WQFN (wettable flank) (RTJ-WF) thermally conductive package.

Package Information
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)
TPS7B7801-Q1RTJ (WQFN, 20)4mm × 4mm
(1) For more information, see the Mechanical, Packaging, and Orderable Information.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
TPS7B7801-Q1 Typical Application Figure 3-1 Typical Application