900844 Datasheet, PDF (81/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
PVINIMG
(Shared with VIMG25)
VOIMG 28
VOUTIMG 28
Controller
_
VREF
+
Z
CTLVIMG 28
AOACCTLVIMG 28
SELVIMG 28
SPI
Interface
COIMG 28
GNDIMG
(Shared with VIMG25)
V OIMG28
I OIMG28
Discharge
Output Monitor
VIMG28CFAULT
Figure 46. VIMG28 Detailed Internal Block Diagram
Main Features
• Uses 3.3 V or V_PWR as the main power supply
• 225 mA maximum continuous output current
• Optimized for a 2.2 µF external filter capacitor with a maximum of 10 mΩ ESR
• Uses internal pass FET
• The output for each LDO is monitored for over-current conditions and under-voltage events
Table 43. VIMG28 Control Register Structure and Bits Description
Name
Bits
Description
CTLVIMGA
2:0
AOACCTLVIMGA 5:3
VIMGACNT (ADDR 0x0x48 - R/W - Default Value: 0x24)
VIMG28 State Control
x0 = Reserved
x1 = Reserved
x2 = Reserved
x3 = Reserved
x4 = OFF
x5 = Low Power
x6 = Active
x7 = Active
VIMG28 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
SELVIMGA
7:6 ^{VIMG28 output voltage selections:}
X0 = 1.5 V
x1 = 2.7 V
x2 = 2.8 V
x3 = 2.9 V
VSDIO
VSDIO is a combo low drop-out (LDO) and power switch. It uses an external P-CH pass FET in Switch mode, and internal
pass FET on LDO mode.
VSDIO serves as an LDO when its output voltage is set to 1.8 V, and as a switch when its output voltage is set to 3.3 V. It
takes its input voltage directly from the 3.3 V output voltage node.
VSDIO supplies the SDIO card module. The card is initially powered up to 3.3 V. If the card is detected to be a low voltage
card, then the rail will be shutdown, configured as 1.8 V, and then turned on.
VSDIO will be actively discharged during shutdown.
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
81