SLVSGB5 August   2022 TPS56C231

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  PWM Operation and D-CAP3 Control Mode
      2. 7.3.2  Eco-mode Control
      3. 7.3.3  4.7-V LDO
      4. 7.3.4  MODE Selection
      5. 7.3.5  Soft Start and Prebiased Soft Start
      6. 7.3.6  Enable and Adjustable UVLO
      7. 7.3.7  Power Good
      8. 7.3.8  Overcurrent Protection and Undervoltage Protection
      9. 7.3.9  UVLO Protection
      10. 7.3.10 Thermal Shutdown
      11. 7.3.11 Output Voltage Discharge
    4. 7.4 Device Functional Modes
      1. 7.4.1 Light Load Operation
      2. 7.4.2 Standby Operation
  8. 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 External Component Selection
          1. 8.2.2.1.1 Output Voltage Set Point
          2. 8.2.2.1.2 Switching Frequency and MODE Selection
          3. 8.2.2.1.3 Inductor Selection
          4. 8.2.2.1.4 Output Capacitor Selection
          5. 8.2.2.1.5 Input Capacitor Selection
      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
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RNN|18
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

GUID-C4018470-F090-40B6-9B07-A0D380249706-low.gif Figure 5-1 18-Pin VQFNRNN Package(Bottom View and Top View)
Table 5-1 Pin Functions
Pin Type(1) Description
Name No.
BOOT 1 I Supply input for the gate drive voltage of the high-side MOSFET. Connect the bootstrap capacitor between BOOT and SW.
VIN 2,11 P Input voltage supply pin for the control circuitry. Connect the input decoupling capacitors between VIN and PGND.
PGND 3, 4, 5,
8, 9, 10		 G Power GND pin for the controller circuit and the internal circuitry. Connect to AGND with a short trace.
SW 6, 7 O Switch node pin. Connect the output inductor to this pin.
AGND 12 G Ground of internal analog circuitry. Connect AGND to the PGND plane with a short trace.
FB 13 I Converter feedback input. Connect to the center tap of the resistor divider between output voltage and AGND.
SS 14 O Soft-start time selection pin. Connecting an external capacitor sets the soft-start time and if no external capacitor is connected, the converter starts up in 1.2 ms.
EN 15 I Enable input control, leaving this pin floating enables the converter. This pin can also be used to adjust the input UVLO by connecting to the center tap of the resistor divider between VIN and EN.
PGOOD 16 O Open-drain power-good indicator. The pin is asserted low if output voltage is out of the PGOOD threshold, overvoltage, or if the device is under thermal shutdown, EN shutdown, or during soft start.
VREG5 17 I/O 4.7-V internal LDO output that can also be driven externally with a 5-V input. This pin supplies voltage to the internal circuitry and gate driver. Bypass this pin with a 4.7-µF capacitor.
MODE 18 I Switching frequency, current limit selection, and light load operation mode selection pin. Connect this pin to a resistor divider from VREG5 and AGND for different MODE options shown in Table 7-2.
(1) I = input, P = power, G = ground, O = output