Typical Power Supply For Digital Still Cameras (Dsc) - Analog Devices ADP50460008 Owner's Manual

ADP50460008
TYPICAL POWER SUPPLY FOR DIGITAL STILL
CAMERAS (DSC)
Figure 61 shows the system block diagram of the ADP5046 when
it is used to power a digital still camera (DSC) system. An external
microcontroller supplied from VREGO controls the power
management activation.
The microcontroller controls the EN pin of the ADP5046 to turn
the regulator rails on or off. Channel 1 (boost) is used to supply
the camera motors and can provide a stable input voltage for other
regulators that have an output voltage that is higher than the Li-Ion
operating range. It is also recommended that the VDD voltage
ADP5046
SCL
SDA
LEVEL SHIFTER
BACKUP
BATTERY
XTAL
2
I C
REGISTERS
INTERFACE
SEQUENCER
EN
UVP AND OVP
RTC
OSCILLATOR
(32.768kHz)
MAIN (Li-ION)
BATTERY
CLKO
Figure 61. Top-Level Diagram in DSC Application
supply be applied from Channel 1. Channel 2 (buck-boost)
provides the supply voltage for the I/O rail. Channel 3 and Channel 6
(buck) are used to supply the main processor core and memory,
respectively. Channel 4 (buck) is dedicated to the supply rail of the
CMOS sensor. Channel 7 provides the output voltage with constant
current control for the LCD backlight and can support from two
to five LEDs in series. The ADP5046 autonomously controls the
backup battery charging and switchover in case the main battery
is removed. The ADP5046 also contains a very low quiescent
current real-time clock circuit that can operate independently of
the main processor and can help to increase the backup time of
the system in the absence of the main battery.
VDD
REFERENCE
VOLTAGE
GENERATOR
CHANNEL 1
CHANNEL 2
CHANNEL 3
CHANNEL 4
ENABLE DELAY
CHANNEL 5
CHANNEL 6
CHANNEL 7
CHANNEL 8
3.2V
UVLO_SYS
REGULATOR
SUB-
MICROCONTROLLER
Rev. Sp0 | Page 52 of 60
ADI Confidential
MOTOR
DRIVER
VDDIO
MAIN
PROCESSOR
V
CORE
CMOS
SENSOR
LCD
BACKLIGHT
POCO
RESET
V
MEMORY