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4.1.3 Buck/Boost Configuration (EFP0106 & EFP0107)

The buck/boost configuration is suitable for applications where the battery voltage may be above or below the required VOA output

voltage. Although very flexible, this configuration has worse efficiency than wired boost or wired buck configurations due to the losses in

the additional power FETs required to support both modes of operation. Typical power supply connections for a buck/boost configura-

tion are show in the following figure.

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

Table 4.3. Supported Operating Mode Settings

Converter / LDO

Operating Mode Bitfield

Supported Modes

DCDC A

BB_CTRL3.BB_MODE

Autonomous (ForceBuck, ForceBoost, ForceNTM can be used in

special circumstances)

DCDC B

BK_CTRL1.BK_MODE

Disabled, BuckOnly, BuckLDO, or LDOOnly

LDO C

LDOC_CTRL.LDOC_ENA_SA

Enabled or Disabled

Main

Supply

–

VDD

VOA

VOC

(1.8V–5.5V)

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 EFP0107

10uF for EFP0106

Figure 4.3. Buck/Boost Configuration

EFP01 Energy Friendly PMIC Family Data Sheet

Typical Connection Diagrams

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