BCM43455 Preliminary 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
BCM43455. All regulators are programmable via the PMU. These blocks simplify power supply design for
Bluetooth, and WLAN 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 BCM43455.
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 BCM43455 allows for an extremely low power-consumption mode by completely shutting down the
CBUCK, CLDO, and LNLDO regulators. When in this state, the LPLDO1 (which is the low-power linear regulator
that is supplied by the system VIO supply) provides the BCM43455 with all required voltage, further reducing
leakage currents.
BCM43455 PMU Features
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VBAT to 1.35Vout (170 mA nominal, 600 mA maximum) Core-Buck (CBUCK) switching regulator
VBAT to 3.3Vout (200 mA nominal, 450 mA–850 mA maximum) LDO3P3
VBAT to 2.5Vout (15 mA nominal, 70 mA maximum) BTLDO2P5
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
1.35V to 1.2Vout (35 mA nominal, 55 mA maximum) LDO for PCIE
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.
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 23
BROADCOM CONFIDENTIAL
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