900844 Datasheet, PDF (82/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
C IN SD IO
VOSD IO
COSDIO
V 33
SDIOGT
MSDIO
FBSDIO
LDO/Switch
Controller _{_}
VR EF
+
Z
VOC C P
Discharge
Output Monitor
CTLVSDIO
AOACCTLVSDIO
SELVSDIO
SPI
Interface
VSDIOFAULT
Figure 47. VSDIO Detailed Internal Block Diagram
MAIN FEATURES
• Uses 3.3 V as the main power supply
• 215 mA maximum continuous output current
• Optimized for a 2.2 µF external filter capacitor with a maximum of 10 mΩ ESR
• Uses an internal pass FET on LDO mode, and external pass FET on Switch mode.
• The output is monitored for under-voltage and over-current conditions in LDO mode.
Table 44. VSDIO Control Register Structure and Bits Description
Name
Bits
Description
CTLVSDIO
2:0
AOACCTLVSDIO 5:3
VSDIOCNT (ADDR 0x4D - R/W - Default Value: 0x64)
VSDIO State Control
x0 = Reserved
x1 = Reserved
x2 = Reserved
x3 = Reserved
x4 = OFF
x5 = Low Power
x6 = Active
x7 = Active
VSDIO State Control during AOAC Exit (when 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
SELVSDIO
7:6 ^{VSDIO output voltage selections:}
X0 = 1.8 V
x1 = 3.3 V
x2 = Reserved
x3 = Reserved
POWER SWITCHES
Freescale’s power management solution for the Ultra-mobile platform for Netbooks, Tablets and Slates, includes 1 dedicated
power switch, housed in the 900844 PMIC. Table 45 shows its power characteristics.
VPNL33 uses an internal switch and are supplied from the 3.3 V output voltage.
Table 45. 900844 Power Switch Voltage Rail
Switch
Typ. Voltage Max Current
Description
VPNL33
3.3 V
100 mA
Power Switch with integrated MOSFET and less than 1% voltage drop.
VPNL33 uses an internal switch and are supplied from the 3.3 V output voltage.
900844
82
Analog Integrated Circuit Device Data
Freescale Semiconductor