Datasheet

Analog Integrated Circuit Device Data
69 Freescale Semiconductor
34709
Functional Block Description
7.5.6.8 VUSB2
VUSB2 has an internal PMOS pass FET to support light loads. An external PNP configuration is offered to avoid excess on-chip
power dissipation at high loads and large differentials between BP and output settings. The input pin for the integrated PMOS
option is shared with the base current drive pin for the external 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 ambient temperature. For
use cases where up to 500
mW of dissipation is required, the recommended PNP device is the ON Semiconductor
NSS12100UW3TCG. For stability reasons, a total resistance of 50
m 20% in series with the output capacitance is required.
The total resistance includes the ESR of the capacitor plus an external resistance provided by a discrete resistor or PCB circuit
trace.
The nominal output voltage of this regulator is configured through SPI, and can be selected among 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 58. VUSB2 Voltage Control
Bits Value
Output
Voltage
ILoad max
VUSB2CONFIG=0
Internal Pass FET
VUSB2CONFIG=1
External PNP
VUSB2[1:0]
00 2.50 V 65 mA 350 mA
01 2.60 V 65 mA 350 mA
10 2.75 V 65 mA 350 mA
11 3.00 V 65 mA 350 mA
Table 59. VUSB2 Electrical Specification
Characteristics noted under conditions BP = 3.6 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
USB2IN
Operating Input Voltage Range V
INMIN
to V
INMAX
V
NOM
+
0.30
- 4.5 V
I
USB2
Operating Current Load Range IL
MIN
to IL
MAX
• Internal pass FET
• External PNP Not exceeding PNP max power
0.0
0.0
-
-
65
350
mA
V
USB2IN
Extended Input Voltage Range
• Performance may be out of specification
UVDET - 4.5
V
VUSB2 ACTIVE MODE - DC
V
USB2
Output Voltage V
OUT
V
NOM
- 3% V
NOM
V
NOM
+ 3% V
V
USB2LOPP
Load Regulation
•1.0 mA < IL < IL
MAX
- 0.25 -
mV/mA
V
USB2LIPP
Line Regulation
- 8.0 - mV
I
USB2Q
Active Mode Quiescent Current
•IL = 0 mA, Internal PMOS configuration
•IL = 0 mA, External PNP configuration
-
-
25
30
-
-
µA
I
USB2DRVLIM
VUSB2DRV Base Drive Current Limit
• External PNP mode only
3.36 4.62 6.10
mA
(57)