13892 datasheet(87/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

SUPPLIES

VGEN3 has an internal PMOS pass FET which will support loads up to 50 mA. For higher current capability, drive for an

external PNP is provided. The external PNP configuration is offered to avoid excess on-chip power dissipation at high loads, and

large differential between BP and output settings. The input pin for the integrated PMOS option is shared with the base current

drive pin for the PNP option. The external PNP configuration must be committed as a hardwired board level implementation, while

the operating mode is selected through the VGEN3CONFIG bit after startup. The VGEN3 is not automatically enabled during the

power up sequence, allowing software to properly set the VGEN3CONFIG bit before the regulator is activated. 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 500 mW of dissipation is required,

the recommended PNP device is the ON Semiconductor NSS12100UW3TCG. For stability reasons a small minimum ESR may

be required.

A short circuit condition will shut down the VGEN3 regulator and generate an interrupt for SCPI.

Table 58. VGEN1 Control Register Bit Assignments

Parameter

Value

Function

ILoad max(63)

Input Supply

VGEN1[1:0]

output = 1.20 V

200 mA

BP or external

switcher

output = 1.50 V

200 mA

BP or external

switcher

output = 2.775 V

200 mA

output = 3.15 V

200 mA

Notes

63.

The max load given for VGEN1MODE = 0 and must take into account the capabilities of the external pass device and operating

conditions, to manage its power dissipation. Load capability is 3.0 mA for VGEN1MODE = 1.

Table 59. VGEN2 Control Register Bit Assignments

Parameter

Value

Function

ILoad max (64)

Input Supply

VGEN2[2:0]

000

output = 1.20 V

350 mA

BP or external

switcher

001

output = 1.50 V

350 mA

BP or external

switcher

010

output = 1.60 V

350 mA

011

output = 1.80 V

350 mA

100

output = 2.70 V

350 mA

101

output = 2.80 V

350 mA

110

output = 3.00 V

350 mA

111

output = 3.15 V

350 mA

Notes

64.

The max load is given for as VGEN2MODE = 0, and must take into account the capabilities of the external pass device and operating

conditions to manage its power dissipation. Load capability is 3.0 mA for VGEN2MODE = 1.

Table 60. VGEN3 Voltage Control

VGEN3 bit

Output Voltage

ILoad max

VGEN3CONFIG = 0

Internal Pass FET

VGEN3CONFIG = 1

External PNP

1.80 V

50 mA

200 mA

2.90 V

50 mA

200 mA

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