SLUSFN2B May   2024  – December 2024 TPS513885

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

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 560kHz operation. Pull MODE pin low to GND for 920kHz 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, can be used for feedforward compensation to improve load transient performance.
VOUT 8 I Output pin. Connect to the output of the buck regulator. The pin also provides the bypass input for internal VCC LDO.
NC 9 — Not connected.
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