MC34708 datasheet(34/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

7.5

Power Generation

The MC34708 PMIC provides reference and supply voltages for the application processor as well as peripheral device.

Five buck (step down) converters and one boost (step up) converters are included. One of the buck regulators can be configured

in multiphase, single phase mode, or operate as separate independent outputs (in this case, there are 6 buck converters). The

buck converters provide the supply to processor cores and to other low voltage circuits such as IO and memory. Dynamic voltage

scaling is provided to allow controlled supply rail adjustments for the processor cores and/or other circuitry. The boost converter

provides power for the VBUS in the OTG mode, as well as the USB PHY on the processor. The VUSB regulator is powered from

the boost to ensure sufficient headroom for the LDO through the normal discharge range of the main battery.

Linear regulators are directly supplied from the battery or from the switching regulator, and include supplies for IO and

peripherals, such as audio, camera, Bluetooth, Wireless LAN, etc. Naming conventions are suggestive of typical or possible use

case applications, but the switching and linear regulators may be utilized for other system power requirements within the

guidelines of specified capabilities. Four general purpose I/Os are available, which can be configured as inputs/outputs. As inputs

they can be configured as interrupts.

7.5.1

Power Tree

Refer to the representative tables and text specifying each supply for information on performance metrics and operating ranges.

Table 22 summarizes the available power supplies.

Table 22. Power Tree Summary

Supply

Purpose (typical application)

Output Voltage (in V)

Load Capability (in mA)

SW1

Buck regulator for processor VDDGP domain

0.650 - 1.4375

2000

SW2

Buck regulator for processor VCC domain

0.650 - 1.4375

1000

SW3

Buck regulator for processor VDD domain and peripherals

0.650 - 1.425

500

SW4A

Buck regulator for DDR memory and peripherals

1.200 – 1.85: 2.5/3.15

500

SW4B

Buck regulator for DDR memory and peripherals

1.200 – 1.85: 2.5/3.15

500

SW5

Buck regulator for I/O domain

1.200 – 1.85

1000

SWBST

Boost regulator for USB OTG

5.00/5.05/5.10/5.15

380

VSRTC

Secure Real Time Clock supply

1.2

0.05

VPLL

Quiet Analog supply

1.2/1.25/1.5/1.8

VREFDDR

DDR Ref supply

0.6-0.9

VDAC

TV DAC supply, external PNP

2.5/2.6/2.7/2.775

250

VUSB2

VUSB/peripherals supply, internal PMOS

2.5/2.6/2.75/3.0

VUSB/peripherals external PNP

2.5/2.6/2.75/3.0

350

VGEN1

General peripherals supply #1

1.2/1.25/1.3/1.35/1.4/1.45/1.5/1.55

250

VGEN2

General peripherals supply #2, internal PMOS

2.5/2.7/2.8/2.9/3.0/3.1/3.15/3.3

General peripherals supply #2, external PNP

2.5/2.7/2.8/2.9/3.0/3.1/3.15/3.3

250

VUSB

USB Transceiver supply

3.3

100

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