BCM43362KUBG Datasheet, PDF (15/84 Pages) Cypress Semiconductor – Single-Chip IEEE 802.11™ b/g/n MAC/Baseband/Radio + SDIO

BCM43362 Data Sheet
Power Supply Topology
Power Supply Topology
The BCM43362 contains a Power Management Unit (PMU), a buck-mode switching regulator, and three low
noise LDOs. These integrated regulators simplify power supply design in WLAN embedded designs. All
regulator inputs and outputs are brought out to pins on the BCM43362, providing system designers with the
flexibility to choose which of the BCM43362 integrated regulators to use. One option is to supply the PMU from
a single, variable power supply, VBAT, which can range from 2.3V to 4.8V. Using this option, all of the required
voltages are provided by BCM43362 regulators except for a low current rail, VIO, which must be provided by
the host to power the I/O signal buffers when the chip is out of reset.
Alternately, if specific rails such as 3.3V, 1.8V, and 1.2V already exist in the system, appropriate regulators in
the BCM43362 can be bypassed, thereby reducing the cost and board space associated with external regulator
components such as inductors and large capacitors.
The CBUCK and CLDO get powered whenever the reset signal is deasserted. The CBUCK regulator can be
turned ON by asserting EXT_SMPS_REQ high. Asserting EXT_PWM_REQ high will set CBUCK to PWM mode.
Driving EXT_PWM_REQ low will put CBUCK in Burst mode. Optionally, LNLDO may also be powered. All
regulators are powered down only when the reset signal is asserted.
Figure 3: Power Topology
BCM43362
2.5V to
LDO3P3^{1 3.4V}
VBAT 2.3V to 4.8V
WL_RST_N
ext_smps_req
ext_pwm_req
1.4V to
Core Buck 1.8V
Regulator
VIO
Notes:
1. LDO3P3 is always enabled when VIO is present in order
to provide bias for VDDIO_RF and the external RF switch.
2. Areas in dark gray are internal to the BCM43362.
3. VDDIO and VDDIO_SD can be powered from separate
supplies if SDIO signaling needs to be at a different level
than VDDIO. This diagram shows the more common case
where VDDIO and VDDIO_SD are powered from the same
supply.
BCM43362
VDDIO_RF
WL OTP (3.3V)
LN LDO1 ^1.2V
BCM43362
WL Radio – Part A
RF PLL
WRF AFE
WRF XO
WRF CLPO/Ext. LPO
WRF LNA/Rx, BG, RCAL
WRFTx
WRF Radio – BB PLL
Section
sensitive to
power supply
noise
CLDO ^1.2V
Internal
LNLDO
(30 mA)
WRF OTP
WL Digital, including
memory
WRF VCO and LOGEN
Loads not
sensitive
to power
supply noise
VDDIO
VDDIO_SD
Optional
(250 mA)
Internal WLAN Power
Amplifiers
External device (BT/FM/GPS/other)
Broadcom_®
February 13, 2015 • 43362-DS106-R
IEEE 802.11 b/g/n MAC/Baseband/Radio + SDIO
Page 14
BROADCOM CONFIDENTIAL