SLUSFU4 September   2024 TPS51388

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 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  PWM Operation and D-CAP3™ Control Mode
      2. 6.3.2  VCC Switchover Function
      3. 6.3.3  Soft Start
      4. 6.3.4  Large Duty Operation
      5. 6.3.5  Power Good
      6. 6.3.6  Overcurrent Protection and Undervoltage Protection
      7. 6.3.7  Overvoltage Protection
      8. 6.3.8  UVLO Protection
      9. 6.3.9  Output Voltage Discharge
      10. 6.3.10 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Light Load Operation
      2. 6.4.2 Advanced Eco-mode Control
      3. 6.4.3 Out-of-Audio™ Mode
      4. 6.4.4 Mode Selection
      5. 6.4.5 Standby Operation
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 External Component Selection
          1. 7.2.2.2.1 VOUT and FB Pin Configuration
          2. 7.2.2.2.2 MODE Selection
          3. 7.2.2.2.3 Inductor Selection
          4. 7.2.2.2.4 Output Capacitor Selection
          5. 7.2.2.2.5 Input Capacitor Selection
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Tape and Reel Information

4 Pin Configuration and Functions

Figure 4-1 13-Pin VQFN-HR, VAB Package (Top View)
Table 4-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME NO.
VIN 1 P Input voltage supply pin for the control circuitry. Connect the input decoupling capacitors between VIN and PGND.
SW 2,12 O Switching node connection to the inductor and bootstrap capacitor for buck. This pin voltage swings from a diode voltage below the ground up to input voltage of buck.
PGND 3,11 G Power GND terminal for the controller circuit and the internal circuitry.
PG 4 O Power good indicator pin. This pin asserts low if the output voltage of buck is out of range due to thermal shutdown, dropout, over-voltage, EN shutdown or during slow start.
MODE 5 I Mode selection pin. Pull MODE pin to voltage larger than 1V, connect the pin to EN or VCC for 600k operation. Pull MODE pin low to GND for 1MHz operation.
EN 6 I Enable input of buck converter. The EN pin is also used to select light load operation mode. Pull EN above 2.2V for Eco-mode. Pull EN between 1V to 1.6V for OOA mode.
FB 7 I Converter feedback input, connect FB to the output voltage with a feedback resistor divider.
BYP 8 I External 5V VCC input, place a 1µF decoupling capacitor close to BYP and PGND, Or connect to the output of the buck regulator if output voltage is set between 4.8V to 5.2V. The pin also provides the bypass input for internal VCC LDO.This BYP external voltage must come after VIN voltage on and quit before VIN off.
FBG 9 I Ground of internal analog circuitry. Decouple this pin to ground with a 4.7μF ceramic capacitor or leave the pin floating. Connect to Rfb_low if wanting to improve load transient performance.
VCC 10 O Internal 5V LDO output. Power supply for internal analog circuits and driving. Decouple this pin to ground with a 2.2μF ceramic capacitor.
VBST 13 I Boot-strap pin. Supply high side gate driver. Connect a 0.1μF ceramic capacitor between this pin and the SW pin.
(1) I = input, O = output, P = power, G = ground