Preliminary Data Sheet
6/30/09
BCM4325
Section 2: On-Chip Power Supplies and Reset
The BCM4325 contains power supply building blocks, including one buck-boost switching regulator, one buck switching
regulator, and five low-noise LDOs to simplify power supply design for Bluetooth and WLAN interfaces in embedded designs.
From a single host power supply, power configurations can be implemented using the BCM4325 on-chip power elements to
create a self contained design. All of the regulators are available with the 339-pin WLCSP package. The 196-ball FBGA
package does not provide access to LNLDO4.
Figure 4 shows available voltage and current from each integrated regulator.
Low Noise LDOs
Switchers
BBOOST
(Buck-Boost Regulator)
2.3V – 5.5V Input (VBAT)
3.3V Output
300 mA
1.4 MHz Switching Frequency
CLDO
(Core LDO)
1.4V – 2V Input
1.25V Output
200 mA
CBUCK
(Core Buck Regulator)
2.3V – 5.5V Input (VBAT)
1.25V / 1.5V Output
300 mA
LNLDO1
(Low Noise LDO1)
1.4V – 2V Input
1.25V Output
130 mA
2.8 MHz Switching Frequency
LNLDO2
(Low Noise LDO2)
Programmable:
1.4V – 2V Input / 1.25V
Output (Default)
3.3V Input / 2.5V Output
80 mA
Available in 196-ball FBGA
and 339-pin WLCSP
packages.
LNLDO4
(Low Noise LDO4)
1.5 / 3.3V Input
1.25 / 2.5V Output
80 mA
Only available in 339-pin
WLCSP packages.
Figure 4: Power Supply Building Blocks
Broadcom Corporation
Document 4325-DS04-R
On-Chip Power Supplies and Reset
Page 3
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