900844 Datasheet, PDF (69/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
VBG
VBG is a low drop-out (LDO) fully integrated regulator with a P-CH Pass FET. It is high performance, low noise, and high
PSRR, with a low quiescent current and fast transient response. VBG is actively discharged during shutdown.
VBG shares an input voltage pin (PVIN1P8) and a reference ground pin (GND1P8) with the VCCA regulator, yet each has
independent control. PVIN1P8 is supplied from the VDDQ voltage if VDDQ output is set to 1.8 V, otherwise connect to V21 when
VDDQ is set to 1.5 V.
VDDQ
PVIN 1P8
VOBG
CIN1P8
VOUTBG
COBG
GND1P8
Controller
VREF
_
+
Z
VOBG
IOBG
Output Monitor
Discharge
CTLVBG
AOACCTLVBG
SPI
Interface
VBGFAULT
Figure 34. VBG Detailed Internal Block Diagram
Main Features
• Uses VDDQ or V21 as the main power supply
• 2.0 mA maximum continuous output current
• Optimized for a 1.0 µF external filter capacitor with a maximum of 10 mΩ ESR
• Uses an internal pass FET
• The output for each LDO is monitored for over-current conditions and under-voltage events
VBG Status/Control Registers and Bits Description
Reference the register map for read/write conditions and default state for each of these registers.
Table 31. VBG Control Register Structure and Bits Description
Name
Bits
Description
CTLVBG
VLBGCNT (ADDR 0x3F - R/W - Default Value: 0 x24)
2:0 ^{VBG State Control}
x0 = Reserved
x1 = Reserved
x2 = Reserved
x3 = Reserved
x4 = OFF
x5 = Low Power
x6 = Active
x7 = Active
AOACCTLVBG 5:3 ^{VBG State Control during AOAC Exit (when the Exit pin is EXITSTBY pin is asserted). These bits will be initialized}
by the system SPI controller after power up.
X0 = Do not copy
x1 = Do not copy
x2 = Do not copy
x3 = Do not copy
x4 = OFF
x5 = Low Power
x6 = Active
x7 = Active
Reserved
7:6 Reserved
VCCA
VCCA is a low drop-out (LDO) fully integrated regulator with a P-CH Pass FET. It is high performance, low noise, and high
PSRR, with a low quiescent current and fast transient response. VCCA is actively discharged during shutdown.
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
69