13892 datasheet(87/158 Pages) FREESCALE

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FUNCTIONAL DEVICE OPERATION

SUPPLIES

Analog Integrated Circuit Device Data



Freescale Semiconductor

MC13892

GEN1, GEN2, AND GEN3 REGULATORS

General purpose LDOs VGEN1, VGEN2, and VGEN3 are provided for expansion of the power tree to support peripheral

devices, which could include WLAN, BT, GPS, or other functional modules. All the regulators include programmable set points

for system flexibility. At the 1.2 V and 1.5 V set points, both VGEN1 and VGEN2 can be powered from an external buck regulator

(2.2 V typ) for an efficiency advantage, and reduced power dissipation in the pass devices. (Note that a connection to BP or the

external buck regulator as the input to the regulators is a hardwired board level commitment, and not changed on-the-fly).

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

Table 57. VSD Voltage Control

Parameter

Value

Output Voltage

ILoad max

Input Supply

VSD[2:0]

000

1.80 V

250 mA

BP or External Switcher

001

2.00 V

250 mA

010

2.60 V

250 mA

011

2.70 V

250 mA

100

2.80 V

250 mA

101

2.90 V

250 mA

110

3.00 V

250 mA

111

3.15 V

250 mA

Table 58. VGEN1 Control Register Bit Assignments

Parameter

Value

Function

ILoad max(75)

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

75.

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 (76)

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

76.

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.

13892 Datasheet(PDF) 87 Page - Freescale Semiconductor, Inc

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