SLVSGP3A May   2023  – February 2024 TPS54KB20

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  Internal VCC LDO and Using External Bias On the VCC Pin
      2. 6.3.2  Enable
      3. 6.3.3  Adjustable Soft Start
      4. 6.3.4  Power Good
      5. 6.3.5  Output Voltage Setting
      6. 6.3.6  Remote Sense
      7. 6.3.7  D-CAP4 Control
      8. 6.3.8  Multifunction Select (MSEL) Pin
      9. 6.3.9  Low-side MOSFET Zero-Crossing
      10. 6.3.10 Current Sense and Positive Overcurrent Protection
      11. 6.3.11 Low-side MOSFET Negative Current Limit
      12. 6.3.12 Overvoltage and Undervoltage Protection
      13. 6.3.13 Output Voltage Discharge
      14. 6.3.14 UVLO Protection
      15. 6.3.15 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Auto-Skip Eco-mode Light Load Operation
      2. 6.4.2 Forced Continuous-Conduction Mode
      3. 6.4.3 Powering the Device From a Single Bus
      4. 6.4.4 Powering the Device From a Split-rail Configuration
  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  Output Voltage Setting Point
        2. 7.2.2.2  Choose the Switching Frequency and the Operation Mode
        3. 7.2.2.3  Choose the Inductor
        4. 7.2.2.4  Set the Current Limit (ILIM)
        5. 7.2.2.5  Choose the Output Capacitor
        6. 7.2.2.6  RAMP Selection
        7. 7.2.2.7  Choose the Input Capacitors (CIN)
        8. 7.2.2.8  Soft-Start Capacitor (SS Pin)
        9. 7.2.2.9  EN Pin Resistor Divider
        10. 7.2.2.10 VCC Bypass Capacitor
        11. 7.2.2.11 BOOT Capacitor
        12. 7.2.2.12 RC Snubber
        13. 7.2.2.13 PG Pullup Resistor
      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 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

4 Pin Configuration and Functions

GUID-20220519-SS0I-VWWP-S3TC-1LT36T3VRNPK-low.svgFigure 4-1 RZR Package16-Pin WQFN-FCRLFTop View
GUID-20220706-SS0I-2LMF-VBRZ-WVQLLZHD1XTZ-low.svgFigure 4-2 RZR Package16-Pin WQFN-FCRLFBottom View
Table 4-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NO. NAME
2 AGND G Analog ground return and reference for the internal control circuits.
5 BOOT I/O Supply for the internal high-side MOSFET gate driver (boost terminal). Connect the bootstrap capacitor from this pin to SW node.
1 EN I Enable pin. The enable pin turns the DC/DC switching converter on or off. Floating EN pin before start-up disables the converter. The recommended maximum voltage applied to the EN pin is 5.5V. TI does not recommend connecting the EN pin to VIN pin directly.
14 FB I Output voltage feedback input. A resistor divider from the output voltage to GOSNS (tapped to FB pin) sets the output voltage. Connect the FB divider to the output voltage near the load.
13 GOSNS I Negative input of the differential remote sense circuit. Connect to a ground sense point near the load.
12 ILIM I Current limit setting pin. Connect a resistor to AGND to set the current limit trip point. TI recommends a ±1% tolerance resistor. See Section 6.3.10 for details on OCL setting.
11 MSEL I Multi-function select pin. A resistor from the MSEL pin to AGND selects between forced continuous-conduction mode (FCCM) or skip-mode operation, the operating frequency, and the PWM ramp setting. A ±1% tolerance resistor is required. See Table 6-4 for details.
10 PG O Open-drain power-good status signal. Connect an external pullup resistor to a voltage source. When the FB voltage moves outside the specified limits, PG goes low after the specified delay.
4, 8, 16 PGND G Ground return for the power stage. This pin is internally connected to the source of the low-side MOSFET. Place as many vias as possible beneath the PGND pins and as close as possible to the PGND pins. This action minimizes parasitic impedance and also lowers thermal resistance.
15 SS I Connect a capacitor to AGND to set the SS time. A minimum 10nF capacitor is required for this pin to avoid overshoot during the charge of soft-start capacitor.
6 SW O Output switching terminal of the power converter. Connect this pin to the output inductor.
7 VCC P Internal 3V LDO output. A 3.3V or 5V external bias can be connected to this pin to save the power losses on the internal LDO. The voltage source on this pin powers both the internal circuitry and gate driver. Bypass with a 1μF, > 6.3V rating, ceramic capacitor from VCC pin to PGND. Place this capacitor as close to the VCC and PGND pins as possible.
3, 9 VIN P Power-supply input pins for both the power stage MOSFETs and the internal LDO. Place the decoupling input capacitors from VIN pins to PGND pins as close as possible. A capacitor from each VIN to PGND close to IC is required.
(1) I = Input, O = Output, P = Supply, G = Ground