CYW4343X
2. Power Supplies and Power Management
2.1 Power Supply Topology
One Buck regulator, multiple LDO regulators, and a power management unit (PMU) are integrated into the CYW4343X. All regula-
tors are programmable via the PMU. These blocks simplify power supply design for Bluetooth, WLAN, and FM functions in embed-
ded designs.
A single VBAT (3.0V to 4.8V DC maximum) and VDDIO supply (1.8V to 3.3V) can be used, with all additional voltages being pro-
vided by the regulators in the CYW4343X.
Two control signals, BT_REG_ON and WL_REG_ON, are used to power up the regulators and take the respective circuit blocks out
of reset. The CBUCK CLDO and LNLDO power up when any of the reset signals are deasserted. All regulators are powered down
only when both BT_REG_ON and WL_REG_ON are deasserted. The CLDO and LNLDO can be turned on and off based on the
dynamic demands of the digital baseband.
The CYW4343X allows for an extremely low power-consumption mode by completely shutting down the CBUCK, CLDO, and
LNLDO regulators. When in this state, LPLDO1 provides the CYW4343X with all required voltage, further reducing leakage currents.
Note: VBAT should be connected to the LDO_VDDBAT5V and SR_VDDBAT5V pins of the device.
Note: VDDIO should be connected to the SYS_VDDIO and WCC_VDDIO pins WCC_VDDIO pin of the device.
2.2 CYW4343X PMU Features
The PMU supports the following:
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VBAT to 1.35Vout (170 mA nominal, 370 mA maximum) Core-Buck (CBUCK) switching regulator
VBAT to 3.3Vout (250 mA nominal, 450 mA maximum 800 mA peak maximum) LDO3P3
1.35V to 1.2Vout (100 mA nominal, 150 mA maximum) LNLDO
1.35V to 1.2Vout (80 mA nominal, 200 mA maximum) CLDO with bypass mode for deep sleep
Additional internal LDOs (not externally accessible)
PMU internal timer auto-calibration by the crystal clock for precise wake-up timing from extremely low power-consumption
mode.
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PMU input supplies automatic sensing and fast switching to support A4WP operations.
Figure 5 on page 12 Figure 6 on page 13 Figure 7 on page 14 and Figure 8 on page 15Figure 9 on page 16 Figure 10 on page 17
show the typical power topology of the CYW4343X.
Document No. 002-14797 Rev. *H
Page 11 of 128
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