13892 datasheet(85/158 Pages) FREESCALE

85 / 158 page

FUNCTIONAL DEVICE OPERATION

SUPPLIES

Analog Integrated Circuit Device Data



Freescale Semiconductor

MC13892

product damage. If a short-circuit condition is detected, the LDO will be disabled by resetting its VxEN bit while at the same time

an interrupt SCPI will be generated to flag the fault to the system processor.

The SCPI interrupt is maskable through the SCPM mask bit.

The SCP feature is enabled by setting the REGSCPEN bit. If this bit is not set, then not only is no interrupt generated, but also

the regulators will not automatically be disabled upon a short-circuit detection. However, the built-in current limiter will continue

to limit the output current of the regulator. Note that by default, the REGSCPEN bit is not set, so at startup none of the regulators

that are in an overload condition will be disabled

VAUDIO AND VVIDEO SUPPLIES

The primary applications of these power supplies are for audio, and TV-DAC. However these supplies could also be used for

other peripherals if one of these functions is not required. Low-power modes and programmable Standby options can be used

to optimize power efficiency during Deep Sleep modes.

An external PNP is utilized for VVIDEO to avoid excess on-chip power dissipation at high loads, and large differential between

BP and output settings. For stability reasons a small minimum ESR may be required. In the Low-power mode for VVIDEO an

internal bypass path is used instead of the external PNP. External PNP devices are always to be connected to the BP line in the

application. The recommended PNP device is the ON Semiconductor NSS12100XV6T1G which is capable of handling up to

250 mW of continuous dissipation at minimum footprint and 75 °C of ambient. For use cases where up to 500mW of dissipation

is required, the recommended PNP device is the ON Semiconductor

 NSS12100UW3TCG. For stability reasons a small

minimum ESR may be required.

VAUDIO is implemented with an integrated PMOS pass FET and has a dedicated input supply pin VINAUDIO.

The following tables contain the specifications for the VVIDEO, VAUDIO.

LOW VOLTAGE SUPPLIES

VDIG and VPLL are provided for isolated biasing of the Baseband system PLLs for clock generation in support of protocol and

peripheral needs. Depending on the lineup and power requirements, these supplies may be considered for sharing with other

loads, but noise injection must be avoided and filtering added if necessary, to ensure suitable PLL performance. The VDIG and

VPLL regulators have a dedicated input supply pin: VINDIG for the VDIG regulator, and VINPLL for the VPLL regulator. VINDIG

and VINPLL can be connected to either BP or a 1.8V switched mode power supply rail, such as from SW4 for the two lower set

points of each regulator VPLL[1:0] and VDIG[1:0] = [00], [01]. In addition, when the two upper set points are used VPLL[1:0] and

VDIG[1:0] = [10], [11], the inputs (VINDIG and VINPLL) can be connected to either BP of a 2.2 V nominal external switched mode

power supply rail to improve power dissipation.

Table 54. VVIDEO and VAUDIO Voltage Control

Parameter

Value

Function

ILoad max

VVIDEO

Output = 2.700 V

250 mA / 350 mA

Output = 2.775 V

250 mA / 350 mA

Output = 2.500 V

250 mA / 350 mA

Output = 2.600 V

250 mA / 350 mA

VAUDIO

Output = 2.300 V

150 mA

Output = 2.500 V

150 mA

Output = 2.775 V

150 mA

Output = 3.000 V

150 mA

Table 55. VPLL and VDIG Voltage Control

Parameter

Value

Function

ILoad max

Input Supply

VPLL[1:0]

output = 1.2 V

50 mA

BP or 1.8 V

output = 1.25 V

50 mA

BP or 1.8 V

output = 1.5 V

50 mA

BP or External Switcher

output = 1.8 V

50 mA

BP or External Switcher

VDIG[1:0]

output = 1.05 V

50 mA

BP or 1.8 V

output = 1.25 V

50 mA

BP or 1.8 V

output = 1.65 V

50 mA

BP or External Switcher

output = 1.8 V

50 mA

BP or External Switcher

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