MC34708 datasheet(74/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

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, a small minimum ESR may be required.

A short-circuit condition will shut down the VGEN1 and VGEN2 regulators, and generate an interrupt for SCPI.

The nominal output voltage of VGEN1 is SPI configurable, and can be 1.2 V, 1.25 V, 1.3 V, 1.35 V, 1.4 V, 1.45 V, 1.5 V, or

1.55 V.

The nominal output voltage of VGEN2 is SPI configurable, and can be 2.5 V, 2.7 V, 2.8 V, 2.9 V, 3.0 V, 3.1 V, 3.15 V, or 3.3 V.

The output current when working with the internal pass FET is 50 mA, and could be up to 250 mA when working with an external

PNP.

Table 63. VGEN1 Control Register Bit Assignments

Parameter

Value

Output Voltage

ILoad max

VGEN1[2:0]

000

1.2000

250 mA

001

1.2500

250 mA

010

1.3000

250 mA

011

1.3500

250 mA

100

1.4000

250 mA

101

1.4500

250 mA

110

1.5000

250 mA

111

1.5500

250 mA

Table 64. VGEN2 Control Register Bit Assignments

Parameter

Value

Output

Voltage

ILoad max

VGEN2CONFIG=0

Internal Pass FET

VGEN2CONFIG=1

External PNP

VGEN2[2:0]

000

2.50

50 mA

250 mA

001

2.70

50 mA

250 mA

010

2.80

50 mA

250 mA

011

2.90

50 mA

250 mA

100

3.00

50 mA

250 mA

101

3.10

50 mA

250 mA

110

3.15

50 mA

250 mA

111

3.30

50 mA

250 mA

Table 65. VGEN1 Electrical Specification

Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C  TA  85 C, unless otherwise noted. Typical values

at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted.

Symbol

Characteristic

Min

Typ

Max

Unit

Notes

GENERAL

VGEN1IN

Operating Input Voltage Range VINMIN to VINMAX

• All settings

1.75

1.8

1.85

IGEN1

• Operating Current Load Range ILMIN to ILMAX

0.0

250

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