BCM88335 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
BCM88335. 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 maximum) and VIO supply (1.8V to 3.3V) can be used, with all additional
voltages being provided by the regulators in the BCM88335.
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 and on based on the dynamic demands of the digital baseband.
The BCM88335 allows for an extremely low power-consumption mode by completely shutting down the
CBUCK, CLDO, and LNLDO regulators. When in this state, LPLDO1 and LPLDO2 (which are low-power linear
regulators that are supplied by the system VIO supply) provide the BCM88335 with all the voltages it requires,
further reducing leakage currents.
PMU Features
•
•
•
•
•
•
VBAT to 1.35V (275 mA nominal, 600 mA maximum) Core-Buck (CBUCK) switching regulator
VBAT to 3.3V (200 mA nominal, 450 mA maximum) LDO3P3
VBAT to 2.5V (15 mA nominal, 70 mA maximum) BTLDO2P5
1.35V to 1.2V (100 mA nominal, 150 mA maximum) LNLDO
1.35V to 1.2V (175 mA nominal, 300 mA maximum) CLDO with bypass mode for deep-sleep
Additional internal LDOs (not externally accessible)
Broadcom®
September 23, 2015 • 88335-DS100-R
Page 21
BROADCOM CONFIDENTIAL
CYPRESS [ CYPRESS ]
