http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




Analog Devices Semiconductor Electronic Components Datasheet

ADP1655 Datasheet

Dual LED Flash Driver

No Preview Available !

ADP1655 pdf
FEATURES
Ultracompact solution
Small 2 mm × 1.5 mm 12-ball WLCSP package
Tiny, low profile 2.2 μH power inductor
LED current source for local LED grounding and low EMI
Synchronous 2 MHz PWM boost convertor, no external diode
High efficiency: 88% peak
Reduces high levels of input battery current during flash
Limits battery current drain in torch mode
I2C programmable
Currents up to 400 mA in flash mode for two LEDs
Currents up to 500 mA in flash mode for one LED with
5% accuracy
Currents up to 160 mA in torch mode with 10% accuracy
Peak inductor current limit
Flash timer
Control
I2C-compatible control registers
External STROBE pin
External direct TORCH pin
TX_MASK input to prevent high input battery current levels
Safety
Thermal overload protection
Flash timeout
Inductor fault detection
Output overvoltage
Short circuit protection
Soft start reduces inrush input current
APPLICATIONS
Camera-enabled cellular phones and smart phones
Digital still cameras, camcorders, and PDAs
GENERAL DESCRIPTION
The ADP1655 is a very compact, highly efficient, dual white
LED flash driver for high resolution camera phones, which
improves picture and video quality in low light environments.
The device integrates a 2 MHz synchronous inductive boost
convertor, an I2C-compatible interface and a 500 mA current
source. The high switching frequency enables the use of a tiny,
low profile 2.2 μH power inductor, and the current source
permits LED cathode grounding for thermally enhanced,
low EMI and compact layouts.
The efficiency is high over the entire battery voltage range to
maximize the input power to LED power conversion and
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Dual LED Flash Driver with
I2C-Compatible Interface
ADP1655
FUNCTIONAL BLOCK DIAGRAM
INPUT VOLTAGE = 2.5V TO 5.5V
2.2µH
10µF
STROBE VIN SW
TORCH
VOUT
ADP1655
SCL/EN1
LED_OUT
SDA/EN2
TX_MASK
I2C/EN SGND PGND
10µF
Figure 1.
3mm
Li-ION +
L1
INDUCTOR
C1
PGND
Li-ION +
C2
LED
ANODE
6.5mm
Figure 2. PCB Layout
DIGITAL
INPUT/
OUTPUT
minimize battery current draw during flash events. In addition,
a Tx-mask input permits the flash LED current to reduce quickly
and, therefore, the battery current reduces quickly, during a
GSM power amplifier current burst.
The I2C-compatible interface enables the programmability
of timers, currents, and status bit readback for operation
monitoring and safety control.
The ADP1655 comes in a compact 12-ball 0.5 mm pitch
WLCSP package and is specified over the full −40°C to
+125°C junction temperature range.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADP1655 Datasheet

Dual LED Flash Driver

No Preview Available !

ADP1655 pdf
ADP1655
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Recommended Specifications: Input and Output Capacitance
and Inductance ............................................................................. 4
I2C-Compatible Interface Timing Specifications ..................... 5
Absolute Maximum Ratings............................................................ 6
Thermal Data ................................................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 12
White LED Driver ...................................................................... 12
Assist Light and Torch Modes .................................................. 12
REVISION HISTORY
5/09—Revison 0: Initial Version
2-Bit Logic Interface Mode (I2C/EN = 0)............................... 13
I2C Interface Mode (I2C/EN = 1)............................................. 13
State Transitions ......................................................................... 15
I2C Register Map............................................................................. 16
Safety Features................................................................................. 19
Overvoltage Fault ....................................................................... 19
Output Capacitor Fault.............................................................. 19
Timeout Fault.............................................................................. 19
Overtemperature Fault .............................................................. 19
Short-Circuit Fault ..................................................................... 19
Current Limit.............................................................................. 19
Amount of LED Detection........................................................ 19
Input Undervoltage .................................................................... 19
Applications Information .............................................................. 20
External Component Selection ................................................ 20
PCB Layout...................................................................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
Rev. 0 | Page 2 of 24


Part Number ADP1655
Description Dual LED Flash Driver
Maker Analog Devices
Total Page 24 Pages
PDF Download
ADP1655 pdf
Download PDF File
ADP1655 pdf
View for Mobile



Buy Electronic Components




Related Datasheet

1 ADP165 Very Low Quiescent Current LDO Regulator Analog Devices
Analog Devices
ADP165 pdf
2 ADP1650 1.5 A LED Flash Driver Analog Devices
Analog Devices
ADP1650 pdf
3 ADP1653 High Power Flash/Torch LED Driver Analog Devices
Analog Devices
ADP1653 pdf
4 ADP1655 Dual LED Flash Driver Analog Devices
Analog Devices
ADP1655 pdf






Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components