900844 Datasheet, PDF (80/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
V 33 or VPWR
PVINIMG
VOIMG 25
C IN IMG
VOUTIMG 25
COIMG 25
GNDIMG
Controller
_
VREF
+
Z
V OIMG25
I OIMG25
Discharge
Output Monitor
CTLVIMG 25
AOACCTLVIMG 25
SPI
Interface
VIMG 25FAULT
Figure 45. VIMG25 Detailed Internal Block Diagram
Main Features
• Uses VPWR (3.3V) as the main power supply
• 80 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
• The output for each LDO is monitored for over-current conditions and under-voltage events
Table 42. VIMG25 Register Structure and Bits Description
Name
Bits
Description
VIMG25CNT (ADDR 0x42 - R/W - Default Value: 0x04)
CTLVIMG25
2:0 ^{VIMG25 State Control}
x0 = Reserved
x1 = Reserved
x2 = Reserved
x3 = Reserved
x4 = OFF
x5 = Low Power
x6 = Active
x7 = Active
AOACCTLVIMG25 5:3 ^{VIMG25 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
VIMG28
VIMG28 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. VIMG28 is actively discharged during shutdown.
VIMG28 shares an input voltage pin (PVINIMG) and a reference ground pin (GNDIMG) with the VIMG25 regulator, yet each
has independent control. Both can be supplied by the VPWR (3.3 V) node. This LDO is optimized to work with 300 mV headroom,
which leaves enough margin between the input and the highest output of this LDO. For more information about package thermal
capabilities, reference Thermal Management.
• Note: At high VIMG28 output voltage selections, the output will start tracking the battery voltage when V_BAT decreases below
V_OIMG28 + 300 mV.
900844
80
Analog Integrated Circuit Device Data
Freescale Semiconductor