Analog Devices ADP1660 Evaluation Board ADP1660CB-EVALZ ADP1660CB-EVALZ データシート
製品コード
ADP1660CB-EVALZ
Dual 750 mA LED Flash Driver
with I
2
C-Compatible Interface
Data Sheet
Rev. 0
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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.
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.
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Tel: 781.329.4700
©2012 Analog Devices, Inc. All rights reserved.
FEATURES
Ultracompact solution
Small, 2 mm × 1.7 mm, 12-ball WLCSP package
Smallest footprint, 1 mm height, 1 μH power inductor
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
Improved LED thermal dissipation
Synchronous 3 MHz PWM boost converter, no external diode
High efficiency: 90% peak
High efficiency: 90% peak
Reduces high levels of input battery current during flash
Limits battery current drain in torch mode
Limits battery current drain in torch mode
I
2
C 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
Programmable dc battery current limit
Programmable flash timer up to 1600 ms
Low battery mode to reduce LED current automatically
Device control
I
2
C-compatible control registers
External STROBE and torch input pins
Transmitter mask (TxMASK) input
Transmitter mask (TxMASK) input
Safety features
Thermal overload protection
Inductor fault detection
LED short-circuit/open-circuit protection
Inductor fault detection
LED short-circuit/open-circuit protection
APPLICATIONS
Camera-enabled cellular phones and smartphones
Digital still cameras, camcorders, and PDAs
Digital still cameras, camcorders, and PDAs
FUNCTIONAL BLOCK DIAGRAM
ADP1660
10µF
1.0µH
INPUT VOLTAGE = 2.7V TO 5.0V
VOUT
PGND
SW
STROBE
10µF
LED1
LED2
EN
SGND
SCL
SDA
TORCH/
TxMASK
GPIO
UP TO
750mA
UP TO
750mA
VIN
1
1
01
8-
0
0
1
Figure 1.
LED2
DIGITAL
INPUT/
OUTPUT
INPUT/
OUTPUT
Li-ION+
PGND
C1
L1
INDUCTOR
LED1
C2
AREA = 16.4mm
2
1
10
18-
002
Figure 2. PCB Layout
GENERAL DESCRIPTION
The
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 I
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 I
2
C-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 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.
range to maximize the input-power-to-LED-power conversion
and minimize battery current draw during flash events.
A programmable dc battery current limit safely maximizes
LED current for all LED forward voltage and battery voltage
conditions.
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 I
currents and battery current during a power amplifier current
burst. The I
2
C-compatible interface can be used to program
timers and currents and to read back status bits for operation
monitoring and safety control.
monitoring and safety control.
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.
full −40°C to +125°C junction temperature range.