EFP01 datasheet(9/158 Pages) SILABS

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3.2 Power

The EFP01 can provide up to three voltage rails for EFR32 and EFM32 devices from a single input supply voltage.

The EFP01 has two independent DCDC converters: DCDC A and DCDC B, each requiring an external inductor. DCDC A can use buck/

boost, wired buck, or wired boost configurations, while DCDC B only supports buck configuration.

In addition, the EFP01 has two integrated LDOs supplied from the VDDB pin: LDO B and LDO C. LDO B is internally wired in parallel

with DCDC B. LDO C can be used independently or externally wired in parallel with DCDC A.

Finally, each EFP01 output (VOA, VOB, VOC) has its own coarse regulator in parallel for use in EM4. The coarse regulators have very

low quiescent current draw, but have poor output regulation (e.g., the output may range from ~1.7 to 3.4 V) and can only support very

light loads (~100 μA).

The EFP01 Configuration Tool in Simplicity Studio can generate recommended settings and a configuration header file to simplify de-

velopment.

3.2.1 DCDC A Overview

The EFP01's DCDC A can be configured for buck/boost, wired buck, or wired boost modes.

Table 3.2. DCDC A Configuration and Modes Summary

Hardware Configuration

DCDC A Operat-

ing Mode

Required Register Setting

Compatible OPNs

Buck

Wired Buck

BB_CTRL3.BB_MODE = 6

EFP0101 / EFP0102

Buck with LDO

Wired Buck with

LDO

BB_CTRL3.BB_MODE = 5

EFP0103 / EFP0104

Buck/Boost

Autonomous

(Buck/Boost)

BB_CTRL3.BB_MODE = 1 (typi-

cally)

EFP0106 / EFP0107

Single-Cell Boost

Wired Boost

BB_CTRL3.BB_MODE = 7

EFP0108

Wired Boost

BB_CTRL3.BB_MODE = 7

EFP0109 / EFP0110

Boost Bootstrap

Wired Boost

BB_CTRL3.BB_MODE = 7

EFP0111

3.2.1.1 Output Voltage Configuration

The DCDC A output target voltage is set by the VOA_V register according to the below equation:

VOA (V ) = 1.7374V + (VOA_V × 0.0306V )

Unlike DCDC B, there is only a single VOA output voltage register that is used in both EM0 and EM2 modes.

Note that in Boost modes it is possible to program the VOA output voltage to a voltage higher than the Maximum Output Voltage in the

Electrical Characteristics table. Firmware should ensure that the Maximum Output Voltage isn't exceeded.

EFP01 Energy Friendly PMIC Family Data Sheet

System Overview

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