BCM4390DKWBGT Datasheet, PDF (13/78 Pages) Cypress Semiconductor – WICED™ Wi-Fi IEEE 802.11 b/g/n SoC with Embedded Application Processor

BCM4390 Advance Data Sheet
Power Supplies and Power Management
Section 2: Power Supplies and Power
Management
BCM4390 PMU Features
• VBAT to 1.35Vout (275 mA nominal, 600 mA maximum) Core-Buck (CBUCK) switching regulator
• VBAT to 3.3Vout (200 mA nominal, 450 mA maximum) LDO3P3
• 1.35V to 1.2Vout (100 mA nominal, 150 mA maximum) LNLDO
• 1.35V to 1.2out (175 mA nominal, 300 mA maximum) CLDO with bypass mode for deep sleep
• Additional internal LDOs (not externally accessible)
Power Supply Topology
One buck regulator, multiple LDO regulators, and a power management unit (PMU) are integrated into the
BCM4390. All regulators are programmable via the PMU. These blocks simplify power supply design for
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 BCM4390.
Two control signals, APPS_REG_ON and WL_REG_ON, are used to power-up the regulators and take the
respective core 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 APPS_REG_ON and WL_REG_ON are deasserted.
The applications processor can drive WL_REG_ON internally when the pin is externally tied to ground. The
CLDO and LNLDO may be turned off/on based on the dynamic demands of the application.
The BCM4390 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 BCM4390 with all the voltages it requires, further
reducing leakage currents.
BROADCOM ®
February 5, 2014 • 4390-DS103-R
WICED Wi-Fi IEEE 802.11 SoC w/Embedded App Processor
Page 12
BROADCOM CONFIDENTIAL