Datasheet

FUNCTIONAL DEVICE OPERATION
SUPPLIES
Analog Integrated Circuit Device Data
72 Freescale Semiconductor
MC13892
BUCK REGULATOR SUPPLIES
Four buck regulators are provided with integrated power switches and synchronous rectification. In a typical application, SW1
and SW2 are used for supplying the application processor core power domains. Split power domains allow independent DVS
control for processor power optimization, or to support technologies with a mix of device types with different voltage ratings. SW3
is used for powering internal processor memory as well as low voltage peripheral devices and interfaces which can run at the
same voltage level. SW4 is used for powering external memory as well as low voltage peripheral devices and interfaces which
can run at the same voltage level.
An anticipated platform use case applies SW1 and SW2 to processor power domains that require voltage alignment to allow
direct interfacing without bandwidth limiting synchronizers.
The buck regulators have to be supplied from the system supply BP, which is drawn from the main battery or the battery
charger (when present). Figure 16 shows a high level block diagram of the buck regulators.
Figure 16. Buck Regulator Architecture
VCAM
Camera supply, internal PMOS 2.5/2.6/2.75/3.0 65
Camera supply, external PNP 2.5/2.6/2.75/3.0 250
VGEN1 General peripherals supply #1, external PNP 1.2/1.5/2.775/3.15 200
VGEN2 General peripherals supply #2, external PNP 1.2/1.5/1.6/1.8/2.7/2.8/3.0/3.15 350
VGEN3
General peripherals supply #3, internal PMOS 1.8/2.9 50
General peripherals supply #3, external PNP 1.8/2.9 250
VUSB USB Transceiver supply 3.3 100
Table 43. Power Tree Summary
Supply Purpose (Typical Application) Output Voltage (in V) Load Capability (in mA)