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PDF ADP1655 Data sheet ( Hoja de datos )
| Número de pieza | ADP1655 | |
| Descripción | Dual LED Flash Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP1655 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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FEATURES
Ultracompact solution
Small 2 mm × 1.5 mm 12-ball WLCSP package
Tiny, low profile 2.2 μH power inductor
LED current source for local LED grounding and low EMI
Synchronous 2 MHz PWM boost convertor, no external diode
High efficiency: 88% peak
Reduces high levels of input battery current during flash
Limits battery current drain in torch mode
I2C programmable
Currents up to 400 mA in flash mode for two LEDs
Currents up to 500 mA in flash mode for one LED with
5% accuracy
Currents up to 160 mA in torch mode with 10% accuracy
Peak inductor current limit
Flash timer
Control
I2C-compatible control registers
External STROBE pin
External direct TORCH pin
TX_MASK input to prevent high input battery current levels
Safety
Thermal overload protection
Flash timeout
Inductor fault detection
Output overvoltage
Short circuit protection
Soft start reduces inrush input current
APPLICATIONS
Camera-enabled cellular phones and smart phones
Digital still cameras, camcorders, and PDAs
GENERAL DESCRIPTION
The ADP1655 is a very compact, highly efficient, dual white
LED flash driver for high resolution camera phones, which
improves picture and video quality in low light environments.
The device integrates a 2 MHz synchronous inductive boost
convertor, an I2C-compatible interface and a 500 mA current
source. The high switching frequency enables the use of a tiny,
low profile 2.2 μH power inductor, and the current source
permits LED cathode grounding for thermally enhanced,
low EMI and compact layouts.
The efficiency is high over the entire battery voltage range to
maximize the input power to LED power conversion and
Rev. 0
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 LED Flash Driver with
I2C-Compatible Interface
ADP1655
FUNCTIONAL BLOCK DIAGRAM
INPUT VOLTAGE = 2.5V TO 5.5V
2.2µH
10µF
STROBE VIN SW
TORCH
VOUT
ADP1655
SCL/EN1
LED_OUT
SDA/EN2
TX_MASK
I2C/EN SGND PGND
10µF
Figure 1.
3mm
Li-ION +
L1
INDUCTOR
C1
PGND
Li-ION +
C2
LED
ANODE
6.5mm
Figure 2. PCB Layout
DIGITAL
INPUT/
OUTPUT
minimize battery current draw during flash events. In addition,
a Tx-mask input permits the flash LED current to reduce quickly
and, therefore, the battery current reduces quickly, during a
GSM power amplifier current burst.
The I2C-compatible interface enables the programmability
of timers, currents, and status bit readback for operation
monitoring and safety control.
The ADP1655 comes in a compact 12-ball 0.5 mm pitch
WLCSP package and is specified 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
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
1 page  
I2C-COMPATIBLE INTERFACE TIMING SPECIFICATIONS
Table 3.
Parameter1
fSCL
tHIGH
tLOW
tSU, DAT
tHD, DAT
tSU, STA
tHD, STA
tBUF
tSU, STO
tR
tF
tSP
CB
Min
0.6
1.3
100
0
0.6
0.6
1.3
0.6
20 + 0.1 CB2
20 + 0.1 CB
0
Max Unit Description
400 kHz SCL clock frequency
μs SCL high time
μs SCL low time
ns Data setup time
0.9 μs
Data hold time
μs Setup time for repeated start
μs Hold time for start/repeated start
μs Bus free time between a stop and a start condition
μs Setup time for stop condition
300 ns
Rise time of SCL and SDA
300 ns
Fall time of SCL and SDA
50 ns Pulse width of suppressed spike
400 pF
Capacitive load for each bus line
1 Guaranteed by design.
2 CB is the total capacitance of one bus line in picofarads.
ADP1655
SDA
tLOW
tR tSU, DAT
tF tF
tHD, STA
SCL
S
tHD, DAT
tHIGH
tSU, STA
Sr
S = START CONDITION
Sr = REPEATED START CONDITION
P = STOP CONDITION
Figure 3. I2C-Compatible Interface Timing Diagram
tSP tR
tBUF
tSU, STO
P
S
Rev. 0 | Page 5 of 24
5 Page 
7.0
VVVIIINNN
=
=
=
3.2V
3.6V
4.2V
6.5
6.0
5.5
5.0
4.5
4.0
–40
–20
0
20 40 60 80
TEMPERATURE (°C)
Figure 23. Operating Quiescent Current vs. Temperature, Torch Mode
4.0
3.5
VVVIIINNN
=
=
=
2.5V
3.6V
4.5V
3.0
2.5
2.0
1.5
1.0
0.5
0
–40 –20
0
20 40 60 80 100
TEMPERATURE (°C)
Figure 24. Standby Current vs. Temperature vs. VIN,
I2C/EN = SCL/EN1 = SDA/EN2 = 1.8 V
120
2.15
2.10
VVVIIINNN
=
=
=
3.2V
3.6V
4.2V
2.05
2.00
1.95
1.90
1.85
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 25. Switching Frequency vs. Temperature vs. VIN
ADP1655
44
VVVIIINNN
=
=
=
3.0V
3.6V
5.5V
42
40
38
36
–40
–20 0
20 40 60 80 100
TEMPERATURE (°C)
Figure 26. LED Regulation, Set at 40 mA,
Current Set Register = 001 (Binary)
120
420
415
VVVIIINNN
=
=
=
3.0V
3.6V
5.5V
410
405
400
395
390
385
380
–40
–20 0
20 40 60 80 100
TEMPERATURE (°C)
Figure 27. LED Regulation, Set at 400 mA,
Current Set Register = 1010 (Binary)
120
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADP1655.PDF ] | |
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