Datasheet

Analog Integrated Circuit Device Data
Freescale Semiconductor 74
MC34708
Functional Block Description
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 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, V
BUS
= 5.0 V, - 40 C  T
A
 85 C, unless otherwise noted. Typical values
at BP = 3.6 V and T
A
= 25 °C under nominal conditions, unless otherwise noted.
Symbol Characteristic Min Typ Max Unit Notes
GENERAL
V
GEN1IN
Operating Input Voltage Range V
INMIN
to V
INMAX
• All settings
1.75 1.8 1.85
V
I
GEN1
• Operating Current Load Range IL
MIN
to IL
MAX
0.0 - 250 mA
VGEN1 ACTIVE MODE – DC
V
GEN1
Output Voltage V
OUT
•V
INMIN
< V
IN
< V
INMAX
IL
MIN
< IL < IL
MAX
V
NOM
– 3% V
NOM
V
NOM
+ 3%
V
V
GEN1LOPP
Load Regulation
•1.0 mA < IL < IL
MAX
For any V
INMIN
< V
IN
< V
INMAX
- 0.25 -
mV/mA
V
GEN1LIPP
Line Regulation
•V
INMIN
< V
IN
< V
INMAX
For any IL
MIN
< IL < IL
MAX
- 5.0 -
mV
I
GEN1Q
Active Mode Quiescent Current
•V
INMIN
< V
IN
< V
INMAX
IL = 0
- 12 -
µA
VGEN1 LOW POWER MODE - DC
V
GEN1
Output Voltage V
OUT
•V
INMIN
< V
IN
< V
INMAX
IL
MINLP
< IL < IL
MAXLP
V
NOM
- 3% V
NOM
V
NOM
+ 3%
V
I
GEN1
Current Load Range IL
MINLP
to IL
MAXLP
0.0 - 3.0 mA
I
GEN1Q
Low Power Mode Quiescent Current
•V
INMIN
< V
IN
< V
INMAX
IL = 0
- 12 -
µA