7.1 Power Supply Mapping
TPS659163 or LP8733 are the Power Management IC (PMIC) that should be used for Device designs. TI requires use of this PMIC for the following reasons:
- TI has validated their use with the Device
- Board level margins including transient response and output accuracy are analyzed and optimized for the entire system
- Support for power sequencing requirements (refer to Section 5.10.3, Power Supply Sequences)
- Support for Adaptive Voltage Scaling (AVS) Class 0 requirements, including TI provided software
Whenever we allow for combining of rails mapped on any of the SMPSs, the PDN guidelines that are the most stringent of the rails combined should be implemented for the particular supply rail. It is possible that some voltage domains on the device are unused in some systems. In such cases, to ensure device reliability, it is still required that the supply pins for the specific voltage domains are connected to some core power supply output.
These unused supplies though can be combined with any of the core supplies that are used (active) in the system. For example, if DSP domain is not used, they can be combined with the CORE domain, thereby having a single power supply driving the combined CORE and DSP domains.
For the combined rail, the following relaxations do apply:
- The AVS voltage of active rail in the combined rail needs to be used to set the power supply
- The decoupling capacitance should be set according to the active rail in the combined rail
Table 7-1 illustrates the approved and validated power supply connections to the Device for the SMPS outputs of the TPS659163 PMIC.
Table 7-1 TPS659163 Power Supply Connections(1)
SMPS |
Valid Combination |
TPS659163 Current Limitation (2)(3) |
SMPS1 |
VD_CORE |
3.5A |
SMPS2 |
Free (DDR Memory) |
3.5A |
SMPS3 |
VD_DSP |
3A |
SMPS4 |
VDDS18V |
1.5A |
- Power consumption is highly application-specific. Separate analysis must be performed to ensure output current ratings (average and peak) is within the limits of the PMIC for all rails of the device.
- Refer to the PMIC data manual for the latest TPS659163 specifications.
- A product’s maximum ambient temperature, thermal system design & heat spreading performance could limit the maximum power dissipation below the full PMIC capacity in order to not exceed recommended SoC max Tj.
Table 7-2 illustrates the approved and validated power supply connections to the Device for the SMPS outputs of the LP8733 PMIC.
Table 7-2 LP8733 Power Supply Connections
SMPS |
Valid Combination |
LP8733 Current Limitation(1)(2)(3) |
SMPS1 |
VD_CORE |
3A |
SMPS2 |
VD_DSP |
3A |
- Refer to the LP8733 Data Manual for exact current rating limitations, including assumed VIN and other parameters. Values provided in this table are for comparison purposes.
- Power consumption is highly application-specific. Separate analysis must be performed to ensure output current ratings (average and peak) is within the limits of the PMIC for all rails of the device.
- A product’s maximum ambient temperature, thermal system design & heat spreading performance could limit the maximum power dissipation below the full PMIC capacity in order to not exceed recommended SoC max Tj.