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EFP01 数据表(PDF) 35 Page - Silicon Laboratories |
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EFP01 数据表(HTML) 35 Page - Silicon Laboratories |
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35 / 158 page  4.1.6 Boost Bootstrap Configuration (EFP0111) The boost bootstrap configuration is a variant of the wired boost configuration intended primarily to support high impedance batteries, such as CR2032 lithium coin cells. DCDC A is configured for wired boost with the VOA output voltage set to a high value (e.g., 5.2V), which in turn is used to supply the VDDB input to DCDC B and LDO C. Inrush current limiting is enabled by default for DCDC A in order to reduce the impact of the battery's internal impedance. However, due to the reduced current, the VOA output is poorly regulated and is expected to droop under heavy load. To compensate, a larger reser- voir output capacitor (≥ 68 µF) is used to help maintain the VOA output. The actual VOA output capacitor size may need to be adjusted based on the peak output current and duty cycle of the specific application. The boost bootstrap configuration is suitable for: • Single lithium (Li/MnO2) CR2032 coin-cells (1.8 to 3.2V) • Dual alkaline, zinc-carbon or lithium iron-disulfide (Li/FeS2) primary cells, or NiMH/NiCd rechargeable cells (1.6 to 3.6V) • 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 4.6. 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 Typical power supply connections for the boost bootstrap configuration are shown below. ` VOA VOC 68µF 2.2µH 2.2µH VDDB VOA SW VOC LB LDO C VOA Buck DC-DC B Boost DC-DC A Buck DC-DC A VOB LDO B LA2 LA1 Low Voltage VDDA ` VOB ` VIO I2C SDA I2C SCL IRQ Control 0.1µF 10µF 0.1µF 10µF 0.1µF VIO 0.1µF ` To Host MCU Main Supply + – VDD (1.5V–5.5V) 10µF 0.1µF Value may depend on peak load and load duty cycle VOC output capacitors only required if enabled Figure 4.6. Boost Bootstrap Configuration EFP01 Energy Friendly PMIC Family Data Sheet Typical Connection Diagrams silabs.com | Building a more connected world. Rev. 1.3 | 35 |
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