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Analog Devices - Dual 750 mA LED Flash Driver

Numéro de référence ADP1660
Description Dual 750 mA LED Flash Driver
Fabricant Analog Devices 
Logo Analog Devices 





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ADP1660 fiche technique
Data Sheet
FEATURES
Ultracompact solution
Small, 2 mm × 1.7 mm, 12-ball WLCSP package
Smallest footprint, 1 mm height, 1 μH power inductor
LED current source for local LED grounding
Simplified routing to and from LEDs
Improved LED thermal dissipation
Synchronous 3 MHz PWM boost converter, no external diode
High efficiency: 90% peak
Reduces high levels of input battery current during flash
Limits battery current drain in torch mode
I2C programmable
Currents up to 750 mA in flash mode per LED
with ±7% accuracy for currents above 100 mA
Torch mode
Programmable dc battery current limit
Programmable flash timer up to 1600 ms
Low battery mode to reduce LED current automatically
Device control
I2C-compatible control registers
External STROBE and torch input pins
Transmitter mask (TxMASK) input
Safety features
Thermal overload protection
Inductor fault detection
LED short-circuit/open-circuit protection
APPLICATIONS
Camera-enabled cellular phones and smartphones
Digital still cameras, camcorders, and PDAs
GENERAL DESCRIPTION
The ADP1660 is a very compact, highly efficient, dual white LED
flash driver for high resolution camera phones that improves
picture and video quality in low light environments. The device
integrates a programmable 1.5 MHz or 3.0 MHz synchronous
inductive boost converter, an I2C-compatible interface, and two
750 mA current sources. The high switching frequency enables
the use of a tiny, 1 mm high, low cost, 1 μH power inductor, and
the parallel current sources permit LED cathode grounding for
thermally enhanced, low EMI, and compact layouts.
The LED driver maximizes efficiency over the entire battery voltage
range to maximize the input-power-to-LED-power conversion
and minimize battery current draw during flash events.
Rev. 0
Document Feedback
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 750 mA LED Flash Driver
with I2C-Compatible Interface
ADP1660
FUNCTIONAL BLOCK DIAGRAM
INPUT VOLTAGE = 2.7V TO 5.0V
1.0µH
10µF
TORCH/
TxMASK
GPIO
VIN SW
VOUT
ADP1660
STROBE
LED1
SCL
SDA
EN
SGND
LED2
PGND
10µF
UP TO
750mA
UP TO
750mA
Figure 1.
C1 Li-ION+
L1
PGND
INDUCTOR
AREA = 16.4mm2
C2
DIGITAL
INPUT/
OUTPUT
LED1 LED2
Figure 2. PCB Layout
A programmable dc battery current limit safely maximizes
LED current for all LED forward voltage and battery voltage
conditions.
A TxMASK input enables fast reduction of the flash LED
currents and battery current during a power amplifier current
burst. The I2C-compatible interface can be used to program
timers and currents and to read back status bits for operation
monitoring and safety control.
The ADP1660 comes in a compact, 12-ball, 0.5 mm pitch
WLCSP package and operates within specification 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
©2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

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