Datasheet

QuickLogic EOS S3 Ultra Low Power multicore MCU datasheet - Version 3.3d 27-129

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Low Dropout Regulators

The EOS S3 platform has two on-chip low dropout regulators (LDOs). One LDO is for SRAM, and the other LDO is for digital

logic. By having a separate regulator for the SRAM, the SRAM voltage can be further reduced to save power consumption.

Table 11: LDO Regulators

LDO Maximum Current Output Voltage Range

LDO-1 for SRAM 50 mA 1.057 V – 1.132 V

LDO-2 for Digital Logic 30 mA 1.057 V – 1.132 V

There are three possible LDO use cases for EOS S3 platform, which allows for flexibility customer in configuration. Each is

illustrated in Figure 40 through Figure 42.

7.3.1. Use Case 1: Dual Voltage Rail Supplied by On-Chip LDOs

In this example, all SRAMs are supplied by LDO-1 and the logic gates are supplied by LDO-2.

Figure 40: Use Case 1: Dual Voltage Rail

1.057 V – 1.132 V

1.62 V – 3.6 V

7.3.2. Use Case 2: Single Voltage Rail Supplied by Single On-Chip LDOs

In this example, the SRAMs and the logic gates are supplied by LDO-1. The VDD2 and VDD1 pads are tied together on the

board. After voltage is applied to LDO_VIN, both LDO-1 and LDO-2 are on. To reduce the device core power consumption,

turn off LDO-2 using the firmware.

NOTE: LDO-1 supports up to 50 mA loading.