BCM4330 Preliminary Data Sheet
Power Supplies and Power Management
Section 2: Power Supplies and Power
Management
Power Supply Topology
One Buck regulator, four LDO regulators, and a Power Management Unit (PMU) are integrated into the
BCM4330. All regulators are programmable via the PMU. These blocks simplify power supply design for
Bluetooth, WLAN, and FM functions in embedded designs. All regulator inputs and outputs are brought out to
pins on the BCM4330. This allows maximum flexibility for the system designer to choose which of the
BCM4330 integrated regulators to use.
A single host power supply can be used (including VBATT ranging from 2.3V to 4.8V) with all additional voltages
being provided by the regulators in the BCM4330.
Two control signals, BT_REG_ON and WL_REG_ON, are used to power-up the regulators. The CBuck CLDO and
LNLDO power up when any of the reset signals are de-asserted. All regulators are powered down only when
both resets are asserted. The CLDO and LNLDO may be turned off/on based on the dynamic demands of the
digital baseband.
Voltage Regulators
All BCM4330 regulator output voltages are PMU-programmable and have the following nominal ratings. The
currents listed below indicate the capabilities of each regulator. See Section 21: “System Power Consumption,”
on page 148 for the actual operating loads.
• Core Buck switching regulator (CBUCK): 2.3–4.8V in; nominal 1.5V, up to 500 mA out
• LDO3p1: 2.3–4.8V in; nominal 2.5V, up to 80 mA out
• LDO3p3: 2.3–4.8 in; nominal 3.15V, up to 80 mA out
• CLDO (for the core): 1.5V in; nominal 1.2V, up to 150 mA out
• Low-noise LNLDO1: 1.5V in; nominal 1.2V, up to 300 mA out
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BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 26
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