
Analog Integrated Circuit Device Data
Freescale Semiconductor
84
PC34708
Functional Block Requirements and Behaviors
LDO Regulators Description and Application Information
7.5.6.4
VDAC
The primary applications of this power supply is the 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 VDAC to avoid excess on-chip power dissipation at high loads and large differentials between BP
and output settings. For stability reasons, a small minimum ESR may be required. In the Low Power mode for VDAC, an internal
bypass path is used instead of the external PNP. External PNP devices must always be connected to the BP line in the
IUSB2Q
Active Mode Quiescent Current, VINMIN < VIN < VINMAX
IL = 0, Internal PMOS configuration
VINMIN < VIN < VINMAX IL = 0, External PNP configuration
-
25
30
-
A
VUSB2 LOW POWER MODE - DC
VUSB2
Output Voltage VOUT
VINMIN < VIN < VINMAX ILMINLP < IL < ILMAXLP
VNOM - 3%
VNOM
VNOM + 3%
V
IUSB2
Current Load Range ILMINLP to ILMAXLP
0
-
3.0
mA
IUSB2Q
Low Power Mode Quiescent Current
VINMIN < VIN < VINMAX IL = 0
-
8.0
10.5
A
VUSB2 ACTIVE MODE - AC
VUSB2PSRR PSRR, IL = 75% of ILMAX 20 Hz to 20 kHz
VIN = VINMIN + 100 mV
VIN = VNOM + 1.0 V
35
50
40
60
-
dB
VUSB2NOIS
E
Output Noise Density, VIN = VINMIN IL = 75% of ILMAX
100 Hz – 1.0 kHz
> 1.0 kHz – 1.0 MHz
-
20
-
1.0
dB/dec
μV/√Hz
tON-VUSB2 Turn-on Time
Enable to 90% of end value VIN = VINMIN, VINMAX IL = 0
-
1.0
ms
tOFF-VUSB2 Turn-off Time
Disable to 10% of initial value VIN = VINMIN, VINMAX IL = 0
0.05
-
10
ms
VUSB2OS-
START
Start-up Overshoot
VIN = VINMIN, VINMAX IL = 0
-
1.0
2.0
%
VUSB2LOTR
ANSIENT
Transient Load Response, VIN = VINMIN, VINMAXx
VUSB2=01, 10, 11
VUSB2=00
-
1.0
50
2.0
70
%
mV
VUSB2LITRA
NSIENT
Transient Line Response
IL = 75% of ILMAX
-
5.0
8.0
mV
tMOD-VUSB2 Mode Transition Time
From low power to active and from active to low power
VIN = VINMIN, VINMAX IL = ILMAXLP
-
100
s
VUSBMODE
RES
Mode Transition Response
From low power to active and from active to low power
VIN = VINMIN, VINMAX IL = ILMAXLP
-
1.0
2.0
%
Table 82. VUSB2 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