EFP01 datasheet(131/158 Pages) SILABS

131 / 158 page

Bit

Name

Reset

Access

Description

4:0

BB_IPK

0x00

read-write

Peak Current setting for DCDC A in EM0. The BB_IPK

setting is used differently depending on the operating

mode of the DCDC A converter, but the resulting peak cur-

rents for all modes are derived from the following base

peak current equation:

IPK_BASE= 0.090A + ( 0.009A * BB_IPK )

When DCDC A is operating in Buck mode:

Buck Mode Peak current in EM0 (Amps) = IPK_BASE +

(25ns * (VDDB - VOA) ) / L

In Boost and NTM modes, the peak current depends on

the battery voltage (VBAT), which varies depending on the

hardware configuration: VBAT is the VDDA pin voltage in

Single-Cell Boost Configuration, VBAT is the VDDB pin

voltage in Wired Boost Configuration, and VBAT is the

voltage at the battery in Boost Bootstrap Configuration.

When DCDC A is operating in NTM mode:

NTM Mode Peak current in EM0 (Amps) = 1.15 *

IPK_BASE + (25ns * VBAT ) / L

When DCDC A is operating in Boost mode with no peak

current adjustment:

Boost Mode (NOADJ=1) Peak current in EM0 (Amps) =

2.35 * IPK_BASE + (25ns * VBAT ) / L

To disable the peak current adjustment in Boost mode, set

BB_CTRL6.BB_IPK_NOADJ=1.

When DCDC A is operating in Boost mode with peak cur-

rent adjustment enabled:

Boost Mode (NOADJ=0) Peak current in EM0 (Amps) =

2.35 * MIN( IPK_BASE * VOA / (2 * VBAT), 385mA ) +

(25ns * VBAT ) / L

When operating in Boost mode with peak current adjust-

ment, the peak current will be adjusted to maintain a near

constant output load current over the battery voltage

range, where the expected output load current is approxi-

mately IPK_BASE / 2. The Peak Current Adjustment fea-

ture requires that BB_CTRL6.BB_IPK_NOADJ=0, that

BB_CTRL5.BB_IPK_BOOST_ADJ is programmed as rec-

ommended in its register description, and that

ADC_CC_CTRL.ADC_INTERVAL > 0 to enable ADC op-

erations.

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