SLVS667B July 2006 – January 2016 TPS65022
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 VRTC Output and Operation With or Without Backup Battery
- 7.3.2 Step-Down Converters, VDCDC1, VDCDC2, and VDCDC3
- 7.3.3 Power Save Mode Operation
- 7.3.4 Low Ripple Mode
- 7.3.5 Soft-Start
- 7.3.6 100% Duty Cycle Low Dropout Operation
- 7.3.7 Active Discharge When Disabled
- 7.3.8 Power Good Monitoring
- 7.3.9 Low Dropout Voltage Regulators
- 7.3.10 Undervoltage Lockout
- 7.3.11 Power-Up Sequencing
- 7.3.12 System Reset + Control Signals
- 7.4 Device Functional Modes
- 7.5 Programming
- 7.6
Register Maps
- 7.6.1 VERSION Register Address: 00h (read only)
- 7.6.2 PGOODZ Register Address: 01h (read only)
- 7.6.3 MASK Register Address: 02h (read/write) Default Value: C0h
- 7.6.4 REG_CTRL Register Address: 03h (read/write) Default Value: FFh
- 7.6.5 CON_CTRL Register Address: 04h (read/write) Default Value: B1h
- 7.6.6 CON_CTRL2 Register Address: 05h (read/write) Default Value: 40h
- 7.6.7 DEFCORE Register Address: 06h (read/write) Default Value: 14h/1Eh
- 7.6.8 DEFSLEW Register Address: 07h (read/write) Default Value: 06h
- 7.6.9 LDO_CTRL Register Address: 08h (read/write) Default Value: set with DEFLDO1 and DEFLDO2
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
10 Layout
10.1 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. Care must be taken in board layout to get the specified performance. If the layout is not carefully done, the regulators may show poor line and/or load regulation, and stability issues as well as EMI problems. It is critical to provide a low impedance ground path. Use wide and short traces for the main current paths. The input capacitors should be placed as close as possible to the IC pins as well as the inductor and output capacitor.
For TPS65022, 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 multiple vias 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 should be connected right to the output capacitor and routed away from noisy components and traces (for example, the L1, L2, and L3 traces).
10.2 Layout Example
Figure 40. DC–DC Regulator Layout Example