BCM4354 Data Sheet
Power Supplies and Power Management
Section 2: Power Supplies and Power
Management
Power Supply Topology
One Buck regulator, multiple LDO regulators, and a power management unit (PMU) are integrated into the
BCM4354. All regulators are programmable via the PMU. These blocks simplify power supply design for
Bluetooth, WLAN, and FM functions in embedded designs.
A single VBAT (3.0V to 5.25V DC max.) and VIO supply (1.8V to 3.3V) can be used, with all additional voltages
being provided by the regulators in the BCM4354.
Two control signals, BT_REG_ON and WL_REG_ON, are used to power-up the regulators and take the
respective section 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 may be turned off/on based on the dynamic demands of the digital baseband.
The BCM4354 allows for an extremely low power-consumption mode by completely shutting down the CBUCK,
CLDO, and LNLDO regulators. When in this state, LPLDO1 (which is a low-power linear regulator supplied by
the system VIO supply) provides the BCM4354 with all the voltages it requires, further reducing leakage
currents.
BCM4354 PMU Features
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VBAT to 1.35Vout (600 mA maximum) Core-Buck (CBUCK) switching regulator
VBAT to 3.3Vout (600 mA maximum) LDO3P3
VBAT to 3.3Vout (150 mA maximum) LDO3P3_B
VBAT to 2.5V out (70 mA maximum) BTLDO2P5
1.35V to 1.2Vout (150 mA maximum) LNLDO
1.35V to 1.2Vout (300 mA maximum) CLDO with bypass mode for deep-sleep
Additional internal LDOs (not externally accessible)
Figure 3 on page 23 illustrates the typical power topology for the BCM4354. The shaded areas are internal to
the BCM4354.
Broadcom®
October 15, 2014 • 4354-DS109-R
Page 22
BROADCOM CONFIDENTIAL
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