NXP DSCs User Manual
Small, efficient, and robust
solutions for digital still cameras
NXP discretes for power management, interface,
and general-purpose applications
NXP discretes for digital still cameras
Digital still cameras (DSCs) are demanding designs. They are portable, battery-powered systems, so they require
components that extend battery life and require very little board space. They also need to deliver quality, reliable
performance while supporting increasing levels of sophisticated functionality.
NXP’s extensive portfolio of discretes for DSCs provides it all: low power consumption, exceptionally small size, and robust
design. With more than 50 years of experience in semiconductors, we are a proven high-volume supplier with the right
solutions for every kind of DSC. We address key issues throughout the camera, from power management and photo flash
to LED status lights, motor control, interface protection, and general-purpose switching.
This brochure is just the beginning. To learn more about how NXP’s discretes can enhance performance of your next DSC
design, go to www.nxp.com
Highlights of NXP’s discretes portfolio
} Medium-power low V
} Low V
} Small-signal MOSFETs (general switching, load switch)
} General-purpose and digital (resistor-equipped) transistors
} General-purpose switching and Zener diodes
(BISS) transistors (power management / charger / LCD backlight)
CEsat
(MEGA) Schottky rectifiers (e.g. 30 V, 1 A)
F
Generic DSC block diagram
CCD sensing,
driver, clocks
AF shutter
Lens actuator
motor
Lens zoom motor
Photoash
DC/DC Power distribution
Battery
management unit
Power
Embedded
processor
Microcontroller
Charger
Audio
USB
Memory cards
LED status light
Display
Power
management
Interfaces
Generalpurpose
switching
Power management
DC/DC conversion and power management
Today’s DSCs mainly use a power management unit (PMU) to handle DC power conversion. Switches are
typically integrated into the PMU, but freewheeling diodes (Schottky diodes) are often used externally due
to low power dissipation and process technology.
Power
management
Interfaces
General-
purpose
switching
V
in
CONTROLLER
bra007
V
PMEG series
out
} Typical spec: VR > 30 V, IF > 500 mA
} Ultra-low forward voltage V
} Small SMD packages
F
System notes
} DSC energy source: 3 or 6 V batteries
- Average standalone energy consumption: 2 W per flash / 500 mW per LCD view
} Power management system includes multiple DC/DC converters, supply line switches, and
control and status logic
- Different voltages required for image processor, microcontroller, memory (1.8 to 3.3 V),
and for CCD image sensor and LCD display (+5, +6.5, +13.5, ±15, or ± 7.5 V)
} Uses power-sequencing circuit
Low VF (MEGA) Schottky rectiers
Package
Size (mm) 2.6 x 1.7 x 1.0 1.7 x 1.25 x 0.7 1.2 x 0.8 x 0.6
VR max (V) IF max (A) VF max (mV) @ IF max IR max (mA) @ VR max Optimization
30
40 3.0 540 0.1 low I
0.5 430 0.15 low V
500 0.5 low V
1.0 360 1.5 low V
520 0.05 low I
680 0.5 low V
F
F
F
R
F
R
SOD123W
PMEG3010ER
PMEG4030ER
SOD323F
(SC-90)
PMEG3005EJ
PMEG3010CEJ
SOD523
(SC-79)
PMEG3005EB
PMEG3010EB
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