EFP01 datasheet(34/158 Pages) SILABS

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4.1.5 Wired Boost Configuration (EFP0109 & EFP0110)

Wired boost configuration is suitable for a wide range of batteries. For example:

• Dual alkaline, zinc-carbon or lithium iron-disulfide (Li/FeS2) primary cells, or NiMH/NiCd rechargeable cells (1.6 to 3.6V)

• Single lithium primary Li/MnO2 cells (1.8 to 3.2V)

• Single lithium iron phosphate (LiFePO4) rechargeable battery (2.5 to 3.65V)

The supported operating mode settings for each converter in this configuration are shown below:

Table 4.5. Supported Operating Mode Settings

Converter / LDO

Operating Mode Bitfield

Supported Modes

DCDC A

BB_CTRL3.BB_MODE

WiredBoost

DCDC B

BK_CTRL1.BK_MODE

Disabled, BuckOnly, BuckLDO, or LDOOnly

LDO C

LDOC_CTRL.LDOC_ENA_SA

Enabled or Disabled

In the wired boost configuration, up to 3 outputs are available. Typical power supply connections for a wired boost configuration are

shown below.

Main

Supply

–

VDD

VOA

VOC

(1.8V–3.6V)

10µF

2.2µH

VDDB

VOA SW

VOC

LDO C

VOA

Buck

DC-DC B

Boost

DC-DC A

Buck

DC-DC A

VOB

LDO B

LA2

LA1

Low Voltage

VDDA

0.1µF

VOB

VIO

I2C SDA

I2C SCL

IRQ

Control

10µF

0.1µF

10µF

0.1µF

VIO

0.1µF

To Host

MCU

VOC output

capacitors only

required if

enabled

2.2uF for EFP0110

10uF for EFP0109

Figure 4.5. Wired Boost Configuration

EFP01 Energy Friendly PMIC Family Data Sheet

Typical Connection Diagrams

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