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ADP1653 Fiches technique(PDF) 1 Page - Analog Devices

No de pièce ADP1653
Description  Compact, High Efficiency, High Power, Flash/Torch LED Driver with Dual Interface
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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ADP1653 Fiches technique(HTML) 1 Page - Analog Devices

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Compact, High Efficiency, High Power,
Flash/Torch LED Driver with Dual Interface
ADP1653
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Small 6.4 mm × 7.2 mm solution
2.2 μH power inductor
92% peak efficiency
Tx masking within 50 μs
2.1 A, 12 V power switch
Pin-selectable interface: 2-bit logic or I2C
Programmable flash and torch current
Up to 200 mA in torch mode
Up to 500 mA in flash mode
Programmable indicator LED current up to 20 mA
Programmable timer register: up to 820 ms flash timeout
2.75 V to 5.5 V input voltage range
Low noise, 1.2 MHz PWM operation
Safety features
Interrupt output pin
Fault condition register
Short-circuit protection
Output overvoltage protection
Thermal overload protection
Integrated current limit and soft start
Small 3 mm × 3 mm, 16-lead LFCSP footprint
APPLICATIONS
Camera-enabled cellular phones, smart phones
Digital still cameras, camcorders, PDAs
GENERAL DESCRIPTION
The ADP1653 is a very compact, high efficiency, high power,
camera flash LED driver optimized for cellular phones. The
high efficiency and dynamic LED current control of the device
improve flash brightness and picture quality in dimly lit
environments. Efficiency peaks at 92% and is higher than
charge pump solutions over the Li-Ion battery range.
The device has a dual-mode interface that is configurable to 2-bit
logic or an I2C® interface. The indicator and high power LED
currents are programmable with external resistors or through the
I2C interface. To maximize overall flash brightness, the ADP1653
offers an input to reduce flash LED current in less than 50 μs,
referred to as the Tx mask. Tx masking reduces battery stress by
scaling back flash LED current during an RF transmission.
The ADP1653 solution requires only four external components
in I2C mode and fits in a 6.4 mm × 7.2 mm space. The part inte-
grates multiple safety features such as soft start, flash timeout,
output current limit, thermal protection, and overvoltage
protection.
The ADP1653 operates over the −40°C to +125°C junction
temperature range.
TYPICAL OPERATING CIRCUIT
16
15
14
13
5
6
7
8
12
11
10
9
1
2
3
4
ADP1653
4.7µF
4.7µF
ONE
OR
TWO
LEDs
UP TO 10.2V
2.2µH
INPUT VOLTAGE = 2.75V TO 5.5V
VDD
TxMASK
OPTIONAL
SETT
SETF
CTRL1/SCL
CTRL0/SDA
EN
STR
VDD
LX
SETI ILED
OUT
GND
PGND
INTF
HPLED
INT
OFF
ON
OFF
ON
Figure 1.
PCB LAYOUT
ADP1653
R5
R4
D1
C1
C2
INDUCTOR
LI-ION +
GND
L1
INPUT CAPACITOR
OUTPUT CAPACITOR
SCHOTTKY DIODE
PGND
7.2mm
TO WHITE
LEDs
FROM WHITE
LEDs
L = FDSE0312-2R2
CIN = GRM219R61A475K
D1 = BAT20J
COUT = GRM21BR61C475K
6.4mm
OPTIONAL (Tx MASK ONLY)
Figure 2.


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