EFP01 datasheet(11/158 Pages) SILABS

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3.2.1.3 Peak Current Adjustment

In boost mode, the EFP01 can be configured to automatically adjust the DCDC A peak current based on the battery voltage to support

a near-constant maximum output load current (where the maximum output load current is ~ IPK_BASE / 2). This feature allows the

boost converter to lower the peak current at higher battery voltages, resulting in more efficient operation and lower output ripple voltage,

as shown in Figure 3.2 Peak Current Adjustment Comparison on page 11.

Because the peak current adjustment feature requires battery voltage monitoring, the ADC must be enabled (i.e., the ADC_INTERVAL

field of the ADC_CC_CTRL register is set to a non-zero value). This also means that peak current adjustment is not available in the

Boost Bootstrap configuration, because battery monitoring is not support in that configuration.

If peak current adjustment is enabled, it will only affect peak current in EM0, and not EM2.

To use peak current adjustment:

1. Set BB_IPK_NOADJ = 0 in the BB_CTRL6 register

2. Program BB_IPK_BOOST_ADJ in the BB_CTRL5 register as recommended in its register description. Note that because the

BB_IPK_BOOST_ADJ value is dependent on both the VOA target voltage and the BB_IPK setting, the BB_IPK_BOOST_ADJ val-

ue should be updated whenever the VOA target or the peak current settings are changed.

3. Set ADC_INTERVAL in the ADC_CC_CTRL register to a non-zero value to enable ADC operations

To disable peak current adjustment, set BB_IPK_NOADJ = 1 in the BB_CTRL6 register.

Figure 3.2. Peak Current Adjustment Comparison

EFP01 Energy Friendly PMIC Family Data Sheet

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