900844 datasheet(80/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

POWER SUPPLIES

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 m

Ω ESR

• Uses an internal pass FET

• The output for each LDO is monitored for over-current conditions and under-voltage events

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 VBAT decreases below

VOIMG28 + 300 mV.

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

Controller

VOIMG 25

V33 or VPWR

PVINIMG

VOUTIMG25

Output Monitor

IOIMG25

SPI

Interface

CINIMG

COIMG 25

VOIMG25

CTLVIMG25

AOACCTLVIMG 25

VIMG25FAULT

VREF

GNDIMG

Discharge

900844 Datasheet(PDF) 80 Page - Freescale Semiconductor, Inc

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