SLVSET0E May   2020  – October 2024 TPS61378-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  VCC Power Supply
      2. 7.3.2  Input Undervoltage Lockout (UVLO)
      3. 7.3.3  Enable and Soft Start
      4. 7.3.4  Shut Down
      5. 7.3.5  Switching Frequency Setting
      6. 7.3.6  Spread Spectrum Frequency Modulation
      7. 7.3.7  Adjustable Peak Current Limit
      8. 7.3.8  Bootstrap
      9. 7.3.9  Load Disconnect
      10. 7.3.10 MODE/SYNC Configuration
      11. 7.3.11 Overvoltage Protection (OVP)
      12. 7.3.12 Output Short Protection/Hiccup
      13. 7.3.13 Power-Good Indicator
      14. 7.3.14 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Forced PWM Mode
      2. 7.4.2 Auto PFM Mode
      3. 7.4.3 External Clock Synchronization
      4. 7.4.4 Down Mode
  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 Programming the Output Voltage
        2. 8.2.2.2 Setting the Switching Frequency
        3. 8.2.2.3 Setting the Current Limit
        4. 8.2.2.4 Selecting the Inductor
        5. 8.2.2.5 Selecting the Output Capacitors
        6. 8.2.2.6 Selecting the Input Capacitors
        7. 8.2.2.7 Loop Stability and Compensation
          1. 8.2.2.7.1 Small Signal Model
          2. 8.2.2.7.2 Loop Compensation Design Steps
          3. 8.2.2.7.3 Selecting the Bootstrap Capacitor
          4. 8.2.2.7.4 VCC Capacitor
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Glossary
    6. 11.6 Electrostatic Discharge Caution
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

5 Pin Configuration and Functions

TPS61378-Q1 16-Pin WQFN RTE Package (Transparent Top View) Figure 5-1 16-Pin WQFN RTE Package (Transparent Top View)
Table 5-1 Pin Functions
PIN I/O DESCRIPTION
NAME NO.
VIN 1 I IC power supply input
BST 2 I Power supply for high-side N-MOSFET gate drivers. A capacitor must be connected between this pin and the SW pin.
SW 3, 4 PWR The switching node pin of the converter. It is connected to the drain of the internal low-side FET and the source of the high-side FET.
MODE/SYNC 5 I Mode selection pin.
MODE = high, forced PWM mode
MODE = low or floating, auto PFM mode
This pin can also be used to synchronize the external clock. Refer to Table 7-2 for details.
VCC 6 O Output of internal regulator. A ceramic capacitor with more than 1 μF must be connected between this pin and GND.
GND 7, 8 PWR Power ground of the IC. It is connected to the source of the low-side FET.
VO 9 PWR Output of the isolation FET. Connect load to this pin to achieve input/output isolation.
OUT 10 PWR Output of the drain of the HS FET. Connect this pin because the output can disable the load disconnect/short protection feature (or short this pin with the VO pin).
PG 11 O Power good indicator and open drain output
ILIM 12 I Current limit setting pin. Use a resistor to set the desired peak current limit. Refer to Section 7.3.7 for details.
FB 13 I Feedback pin. Use a resistor divider to set the desired output voltage. Refer to Section 8.2.2.1 for details.
COMP 14 I Output of the internal transconductance error amplifier. An external RC network is connected to this pin to optimize the loop stability and response time.
EN 15 I Enable logic input
FREQ 16 I Frequency setting pin. Connect a resistor between this pin and GND pin to set the desired frequency.
Thermal Pad - - The thermal pad must be connected to the power ground plane for good power dissipation.