BCM89359 Advance 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
BCM89359. 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 4.8V DC max) and VIO supply (1.8V or 3.3V) can be used, with all additional voltages
being provided by the regulators in the BCM89359.
Three control signals, BT_REG_ON, WL_REG_ON, and WPT_REG_ON (that is, WPT_1P8), 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 and the wireless supplies (that is, WPT_1P8/WPT_3P3) are not
available. 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 BCM89359 allows for an extremely low power-consumption mode by completely shutting down the
CBUCK, CLDO, and LNLDO regulators. When in this state, MEMLPLDO and LPLDO (which is a low-power
linear regulator supplied by the system VIO supply) provide the BCM89359 with all the voltages it requires,
further reducing leakage currents.
BCM89359 PMU Features
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VBAT to 1.35Vout (600 mA maximum) core-buck (CBUCK) switching regulator
VBAT to 3.3Vout (650 mA maximum) PALDO3P3
VBAT to 3.3Vout (200 mA maximum) LDO3P3
VBAT to 2.5V out (70 mA maximum) BTLDO2P5
1.35V to 1.2Vout (150 mA maximum) LNLDO
1.35V to 1.2Vout (420 mA maximum) CLDO with bypass mode for deep-sleep
1.35V to 1.2Vout (100 mA maximum) HLDO
VDDIO to 0.9Vout (10 mA maximum) MEMLPLDO
VDDIO to 1.1Vout (3 mA maximum) LPLDO
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 MM WC operations
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 17
BROADCOM CONFIDENTIAL
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