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4.1.2 Wired Buck with LDO C Configuration (EFP0103 & EFP0104)

The wired buck with LDO configuration is targeted at batteries with a nominal voltage above 2.5V where the input voltage may ap-

proach the buck converter output voltage. In this mode, DCDC A bucks the supply voltage to a lower voltage until the supply voltage

approaches the VOA output voltage. At that point, the converter dynamically switches to use the LDO instead to power the VOA output.

Note that in this mode, LDO C is wired in parallel with the VOA output, and thus not available as an independent LDO.

The wired buck with LDO configuration is suitable for a wide range of batteries and input supplies. For example:

• Single lithium (Li/MnO2) CR2032 coin-cells (1.8 to 3.2V)

• Single lithium thionyl chloride (Li/SOCl2) primary cell (3.0 to 3.65V)

• Single li-ion/li-polymer (typically LiCoO2) rechargeable batteries (2.7 to 4.35V)

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

• Line power / USB (< 5.5V)

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

Table 4.2. Supported Operating Mode Settings

Converter / LDO

Operating Mode Bitfield

Supported Modes

DCDC A

BB_CTRL3.BB_MODE

WiredBuckLDO

DCDC B

BK_CTRL1.BK_MODE

Disabled, BuckOnly, BuckLDO, or LDOOnly

LDO C

LDOC_CTRL.LDOC_ENA_SA

Disabled

Typical power supply connections for a wired buck with LDO configuration are show in the following figure.

Main

Supply

–

VDD

VOA

(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

VIO

0.1µF

To Host

MCU

2.2uF for EFP0104

10uF for EFP0103

Figure 4.2. Wired Buck with LDO C Configuration

EFP01 Energy Friendly PMIC Family Data Sheet

Typical Connection Diagrams

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