6 Designing the Power Subsystem

Once the block diagram has been validated for pin multiplexing, electrical, and timing compatibility, the power sub-system can be designed. See the below resources on estimating power consumption and designing a matching power subsystem.

• AM335x Power Consumption Summary wiki: The AM335x power numbers discuss the power consumption for common system application usage scenarios for the AM335x Arm®Cortex®-A8 Microprocessors (MPUs). Power consumption is highly dependent on the individual user’s application; however, this document focuses on providing several AM335x application-usage case scenarios and the environment settings that were used to perform such power measurements.
• AM335x Power Estimation Tool: The Power Estimation Tool (PET) provides insight into the power consumption of select Sitara processors. The tool includes the ability for you to choose multiple application scenarios and understand the power consumption as well as how advanced power saving techniques can be applied to further reduce overall power consumption.

Table 1. AM335x Power Options

	TPS65217x				TPS65218	TPS65910x		TPS650250
	A	B	C	D		A	A3
Battery Charger	Yes				No	No		No
Boost	WLED backlighting				No			No
AM335x OPP	OPP50, OPP100	OPP50, OPP100, OPP120, Turbo, Nitro			OPP50, OPP100 OPP120, Turbo, Nitro	OPP50, OPP100, OPP120, Turbo, Nitro		OPP50, OPP100
Power	3DCDC @ 1.2A				3 DCDC @ 1.8A 1 DCDC @ 1.6A 2 low-q DCDC for RTC 1 LDO and 3 LSW	2 DCDC @ 1.5A 1 DCDC @ 1A 9 LDO		1 DCDC @ 1.6A 2 DCDC @ 0.8A 3 LDO
Input Voltage Range	2.7 V - 5.8 V				2.5 V - 6.5 V	2.7 V - 5.5 V		2.5 V - 6.5 V
DVFS/SmartReflex	Yes				Yes	Yes		No
RTC-Only Mode	Yes		No		Yes	Yes		No
DDR	DDR2, LPDDR1		DDR3	DDR3L	DDR3, DDR3L	DDR2, LPDDR1	DDR3	DDR2, LPDDR1, DDR3
Package	48 pin QFn, 6 mm x 6 mm				32 pin QFN 5 mm x 5 mm	48 pin QFn, 6 mm x 6 mm		32 pin QFN 5 mm x 5 mm
TA	- 40°C to 105°C				- 40°C to 85°C	- 40°C to 85°C		- 40°C to 85°C

• Powering the AM335x With the TPS65217x
• TPS65910Ax User's Guide For AM335x Processors
• Powering the AM335x With the TPS650250