
Analog Integrated Circuit Device Data
Freescale Semiconductor
83
PC34708
Functional Block Requirements and Behaviors
LDO Regulators Description and Application Information
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. The recommended PNP device 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 ON Semiconductor
NSS12100UW3TCG. For stability reasons, a small minimum ESR may be required.
A short-circuit condition will shut down the VUSB2 regulator and generate an interrupt for SCPI.
The nominal output voltage of this regulator is SPI configurable, and can be 2.5 V, 2.6 V, 2.75 V, or 3.0 V. The output current
when working with the internal pass FET is 65 mA, and could be up to 350 mA when working with an external PNP.
Table 81. VUSB2 Voltage Control
Parameter Value
Output
Voltage
ILoad max
VUSB2CONFIG=0
Internal Pass FET
VUSB2CONFIG=1
External PNP
VUSB2[1:0]
00
2.5 V
65 mA
350 mA
01
2.6 V
65 mA
350 mA
10
2.75 V
65 mA
350 mA
11
3.00 V
65 mA
350 mA
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
GENERAL
VUSB2IN
Operating Input Voltage Range VINMIN to VINMAX
VNOM +
0.25
-
4.5
V
IUSB2
Operating Current Load Range ILMIN to ILMAX
Internal pass FET
External PNP Not exceeding PNP max power
0
-
65
350
mA
VUSB2IN
Extended Input Voltage Range
Performance may be out of specification
UVDET
-
4.5
V
COVUSB2
Minimum Bypass Capacitor Value
Internal pass device
External pass device
0.65
1.1
2.2
-
F
ESRVUSB2 Bypass Capacitor ESR
10 kHz – 1.0 MHz
20
-
100
m
Ω
VUSB2 ACTIVE MODE - DC
VUSB2
Output Voltage VOUT
VINMIN < VIN < VINMAX ILMIN < IL < ILMAX
VNOM - 3%
VNOM
VNOM + 3%
V
VUSB2LOPP Load Regulation
1.0 mA < IL < ILMAX For any VINMIN < VIN < VINMAX
-
0.25
-
mV/mA
VUSB2LIPP Line Regulation
VINMIN < VIN < VINMAX For any ILMIN < IL < ILMAX
-
8.0
-
mV
VUSB2SCTH Short-circuit Protection threshold
VINMIN < VIN < VINMAX Short-circuit VOUT to GND
ILMAX+20
%
-
mA