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Analog Devices Semiconductor Electronic Components Datasheet

ADP1653 Datasheet

High Power Flash/Torch LED Driver

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ADP1653 pdf
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Compact, High Efficiency, High Power
Flash/Torch LED Driver with Dual Interface
ADP1653
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 I2
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
device’s high efficiency and dynamic LED current control
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.
OPTIONAL
TxMASK
TYPICAL OPERATING CIRCUIT
INPUT VOLTAGE = 2.75V TO 5.5V
ON ON
OFF OFF
2.2µH
4.7µF
UP TO 10.2V
16 15 14
STR EN VDD
1 SETT
2 SETF
ADP1653
4.7µF
13
LX
PGND 12
INT 11
ONE
OR
TWO
LEDs
3 CTRL1/SCL
INTF 10
4 CTRL0/SDA
HPLED 9
SETI ILED OUT GND
5678
VDD
Figure 1.
Rev. A
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.
PCB LAYOUT
LI-ION +
GND
INPUT CAPACITOR
INDUCTOR
L1 C1
SCHOTTKY DIODE
D1
7.2mm
R5
R4
ADP1653
C2 TO WHITE
LEDs
OUTPUT CAPACITOR
PGND
L = FDSE0312-2R2
CIN = GRM219R61A475K
D1 = BAT20J
COUT = GRM21BR61C475K
FROM WHITE
LEDs
OPTIONAL (Tx MASK ONLY)
6.4mm
Figure 2.
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.


Analog Devices Semiconductor Electronic Components Datasheet

ADP1653 Datasheet

High Power Flash/Torch LED Driver

No Preview Available !

ADP1653 pdf
ADP1653
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Operating Circuit................................................................ 1
PCB Layout........................................................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
I2C Timing Specifications............................................................ 5
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
Boundary Condition.................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
REVISION HISTORY
1/07—Revision A: Initial Version
Typical Performance Characteristics ..............................................9
Theory of Operation ...................................................................... 13
White LED Driver ...................................................................... 13
2-Bit Logic Interface Mode (INTF = 1)................................... 14
I2C Interface Mode (INTF = 0)................................................. 14
Turning on the Flash and Watchdog Timer ........................... 15
Safety Features ............................................................................ 16
Applications Information .............................................................. 17
Flash-Current Foldback During Transmit Pulse ................... 17
External Component Selection ................................................ 18
PCB Board Layout...................................................................... 19
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
Rev. A | Page 2 of 24


Part Number ADP1653
Description High Power Flash/Torch LED Driver
Maker Analog Devices
Total Page 24 Pages
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