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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 I 2 C
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
TYPICAL OPERATING CIRCUIT
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 I 2 C? interface. The indicator and high power LED
currents are programmable with external resistors or through the
I 2 C 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 I 2 C 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.
PCB LAYOUT
INPUT VOLTAGE = 2.75V TO 5.5V
4.7μF
LI-ION +
INDUCTOR
GND
INPUT CAPACITOR
OFF
ON
OFF
ON
2.2μH
UP TO 10.2V
L1
C1
SCHOTTKY DIODE
4.7μF
16
15
14
13
STR
EN
V DD
LX
D1
OPTIONAL
TxMASK
1
2
SETT
SETF
ADP1653
PGND 12
INT 11
ONE
OR
TWO
LEDs
7.2mm
C2
TO WHITE
LEDs
3
CTRL1/SCL
INTF 10
R5
OUTPUT CAPACITOR
PGND
4
CTRL0/SDA
SETI ILED
5 6
OUT
7
HPLED 9
GND
8
ADP1653
L = FDSE0312-2R2
CIN = GRM219R61A475K
D1 = BAT20J
COUT = GRM21BR61C475K
R4
FROM WHITE
LEDs
V DD
Figure 1.
OPTIONAL (Tx MASK ONLY)
6.4mm
Figure 2.
Rev. B
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.
Trademarks and registered trademarks are the property of their respective owners.
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.
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