
Analog Integrated Circuit Device Data
Freescale Semiconductor
82
PC34708
Functional Block Requirements and Behaviors
LDO Regulators Description and Application Information
7.5.6.2
VREFDDR
VREFDDR is an internal PMOS half supply Voltage Follower. The output voltage is at one half the input voltage. It’s typical
application is as the VREF for DDR memories. A filtered resistor divider is utilized to create a low frequency pole. This divider then
utilizes a voltage follower to drive the load.
7.5.6.3
VUSB2
VUSB2 has an internal PMOS pass FET which will support loads up to 65 mA. To support load currents an external PNP is
provided. The external PNP configuration is offered to avoid excess on-chip power dissipation at high loads and large differentials
between BP and output settings. For lower current requirements, an integrated PMOS pass FET is included. The input pin for
VPLL-
LOTRANSIENT
Transient Load Response
VIN = VINMIN, VINMAX
-
50
70
mV
VPLL-
LITRANSIENT
Transient Line Response
IL = 75% of ILMAX
-
5.0
8.0
mV
Table 80. VREFDDR 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
VREFFDDRIN Operating Input Voltage Range VINMIN to VINMAX
1.2
-
1.8
V
IREFDDR
Operating Current Load Range ILMIN to ILMAX
0
-
10
mA
VREFDDR ACTIVE MODE – DC
VREFDDR
Output Voltage VOUT
VINMIN < VIN < VINMAX ILMIN < IL < ILMAX
0.6
VIN/2
0.9
V
VREFDDRTOL Output Voltage tolerance
VINMIN < VIN < VINMAX IL = 1.0 mA
-
2.0
%
VREFDDRLOP
P
Load Regulation
1.0 mA < IL < ILMAX For any VINMIN < VIN < VINMAX
-
5.0
-
mV/mA
IREFDDRQ
Quiescent Current
VINMIN < VIN < VINMAX IL = 0
-
8.0
-
A
VREFDDR ACTIVE MODE – AC
tON-VREFDDR Turn-on Time
Enable to 90% of end value VIN = VINMIN, VINMAX IL = 0
-
100
s
tOFF-
VREFDDR
Turn-off Time
Disable to 10% of initial value VIN = VINMIN, VINMAX, IL = 0
0.05
-
10
ms
VREFDDROS Start-up Overshoot
VIN = VINMIN, VINMAX IL = 0
-
1.0
2.0
%
VREFDDRLTR
ANSIENT
Transient Load Response
VIN = VINMIN, VINMAX
-
5.0
-
mV
Table 79. VPLL 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