SLVS613D October   2005  – December 2015 TPS65021

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics
    6. 7.6  Electrical Characteristics: Supply Pins VCC, VINDCDC1, VINDCDC2, VINDCDC3
    7. 7.7  Electrical Characteristics: Supply Pins VBACKUP, VSYSIN, VRTC, VINLDO
    8. 7.8  Electrical Characteristics: VDCDC1 Step-Down Converter
    9. 7.9  Electrical Characteristics: VDCDC2 Step-Down Converter
    10. 7.10 Electrical Characteristics: VDCDC3 Step-Down Converter
    11. 7.11 Timing Requirements
    12. 7.12 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  VRTC Output and Operation With or Without Backup Battery
      2. 8.3.2  Step-Down Converters, VDCDC1, VDCDC2, and VDCDC3
      3. 8.3.3  Power Save Mode Operation
      4. 8.3.4  Low-Ripple Mode
      5. 8.3.5  Soft-Start
      6. 8.3.6  100% Duty Cycle Low-Dropout Operation
      7. 8.3.7  Active Discharge When Disabled
      8. 8.3.8  Power-Good Monitoring
      9. 8.3.9  Low-Dropout Voltage Regulators
      10. 8.3.10 Undervoltage Lockout
      11. 8.3.11 Power-Up Sequencing
    4. 8.4 Device Functional Modes
    5. 8.5 Programming
      1. 8.5.1 System Reset + Control Signals
        1. 8.5.1.1 DEFLDO1 and DEFLDO2
        2. 8.5.1.2 Interrupt Management and the INT Pin
      2. 8.5.2 Serial Interface
    6. 8.6 Register Maps
      1. 8.6.1 VERSION Register Address: 00h (Read Only)
      2. 8.6.2 PGOODZ Register Address: 01h (Read Only)
      3. 8.6.3 MASK Register Address: 02h (Read and Write), Default Value: C0h
      4. 8.6.4 REG_CTRL Register Address: 03h (Read and Write), Default Value: FFh
      5. 8.6.5 CON_CTRL Register Address: 04h (Read and Write), Default Value: B1h
      6. 8.6.6 CON_CTRL2 Register Address: 05h (Read and Write), Default Value: 40h
      7. 8.6.7 DEFCORE Register Address: 06h (Read and Write), Default Value: 14h/1Eh
      8. 8.6.8 DEFSLEW Register Address: 07h (Read and Write), Default Value: 06h
      9. 8.6.9 LDO_CTRL Register Address: 08h (Read and Write), Default Value: Set With DEFLDO1 and DEFLDO2
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Input Voltage Connection
      2. 9.1.2 Unused Regulators
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Inductor Selection for the DC-DC Converters
        2. 9.2.2.2 Output Capacitor Selection
        3. 9.2.2.3 Input Capacitor Selection
        4. 9.2.2.4 Output Voltage Selection
        5. 9.2.2.5 VRTC Output
        6. 9.2.2.6 LDO1 and LDO2
        7. 9.2.2.7 TRESPWRON
        8. 9.2.2.8 VCC Filter
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Requirements for Supply Voltages below 3.0 V
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

11 Layout

11.1 Layout Guidelines

As for all switching power supplies, the layout is an important step in the design. Proper function of the device demands careful attention to PCB layout. Take care in board layout to get the specified performance. If the layout is not carefully done, the regulators may show poor line, load regulation, or both, and stability issues as well as EMI problems. It is critical to provide a low impedance ground path. Therefore, use wide and short traces for the main current paths. The input capacitors must be placed as close as possible to the IC pins as well as the inductor and output capacitor.

For TPS65021, connect the PGND pins of the device to the PowerPAD land of the PCB and connect the analog ground connections (AGND) to the PGND at the PowerPAD. It is essential to provide a good thermal and electrical connection of all GND pins using multiples through to the GND-plane. Keep the common path to the AGND pins, which returns the small signal components, and the high current of the output capacitors as short as possible to avoid ground noise. The VDCDCx line must be connected right to the output capacitor and routed away from noisy components and traces (for example, the L1, L2 and L3 traces).

11.2 Layout Example

TPS65021 Layout.gif Figure 40. Layout Example of a DC–DC Converter