13892 datasheet(72/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

SUPPLIES

BUCK SWITCHER SUPPLIES

Four buck switchers 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 switchers 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 switchers.

Figure 16. Buck Switcher Architecture

VCAM

Camera supply, internal PMOS

2.5/2.6/2.75/3.0

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

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)

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