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PDF ADP1660 Data sheet ( Hoja de datos )
| Número de pieza | ADP1660 | |
| Descripción | Dual 750 mA LED Flash Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP1660 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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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
1 page  
ADP1660
Data Sheet
Parameter2
DIGITAL INPUTS/GPIO PIN
Input Logic Low Voltage
Input Logic High Voltage
GPIO, STROBE Pull-Down Resistance
Torch Glitch Filtering Delay4
SAFETY FEATURES
Maximum Timeout for Flash
Timer Accuracy
DC Current Limit5
Low Battery Mode Transition Voltage
Error
Hysteresis
Coil Peak Current Limit6
Overvoltage Detection Threshold
LED1/LED2 Short-Circuit Detection
Comparator Reference Voltage
Thermal Shutdown Threshold
TJ Rising
TJ Falling
Test Conditions/Comments
Min
1.26
From GPIO (torch) rising edge to device start 7.4
DC current value setting = 0 (000 binary)
DC current value setting = 1 (001 binary)
DC current value setting = 2 (010 binary)
DC current value setting = 3 (011 binary)
DC current value setting = 4 (100 binary)
DC current value setting = 5 (101 binary)
DC current value setting = 6 (110 binary)
DC current value setting = 7 (111 binary)
−7.0
0.9
1.1
1.35
1.55
1.8
2.0
2.25
2.45
Peak current value setting = 0 (00 binary)
Peak current value setting = 1 (01 binary)
Peak current value setting = 2 (10 binary)
Peak current value setting = 3 (11 binary)
2.02
2.47
2.9
3.15
5.15
1 VIN is the input voltage to the circuit.
2 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
3 VSW is the voltage on the SW switch pin.
4 Guaranteed by design. Torch glitch filtering depends directly on internal oscillator tolerances.
5 All dc current limit values are guaranteed by design except for the 1.25 A setting, which is tested in production.
6 All coil peak current limit values are guaranteed by design except for the 2.25 A setting, which is tested in production.
Typ
390
8.0
1600
1.0
1.25
1.5
1.75
2.0
2.25
2.5
2.75
50
2.25
2.75
3.25
3.5
5.5
1.0
Max
0.54
8.6
+7.0
1.1
1.4
1.65
1.95
2.2
2.5
2.75
3.1
3.2
2.5
3.0
3.5
3.85
5.9
1.3
150
140
Unit
V
V
kΩ
ms
ms
%
A
A
A
A
A
A
A
A
%
mV
A
A
A
A
V
V
°C
°C
RECOMMENDED SPECIFICATIONS: INPUT AND OUTPUT CAPACITANCE AND INDUCTANCE
Table 2.
Parameter
Symbol Test Conditions/Comments
Min
Typ
Max
CAPACITANCE
CMIN TA = −40°C to +125°C
Input
4.0 10
Output
3.0 10
20
MINIMUM AND MAXIMUM INDUCTANCE L
TA = −40°C to +125°C
0.6 1.0 1.5
Unit
µF
µF
µH
Rev. 0 | Page 4 of 28
5 Page 
ADP1660
Data Sheet
THEORY OF OPERATION
The ADP1660 is a high power, I2C programmable, dual white
LED driver ideal for driving white LEDs for use as a camera
flash. The ADP1660 includes a boost converter and two current
regulators suitable for powering two high power white LEDs.
WHITE LED DRIVER
The ADP1660 drives a synchronous 3 MHz boost converter as
required to power the high power LEDs.
• If the sum of the LED forward voltage plus the current
source headroom voltage is higher than the battery voltage,
the boost converter is turned on.
• If the battery voltage is higher than the sum of the LED
forward voltage plus 2× the current source headroom
voltage, the boost converter is disabled and the part
operates in pass-through mode.
The ADP1660 uses an integrated P-FET high-side current
regulator for accurate brightness control.
The ADP1660 supports the setting of different currents for each
LED, although this configuration is not recommended. Any mis-
match in the forward voltage of the two LEDs translates directly
to lower efficiency, as well as lower accuracy of the current for the
lower voltage LED. It is recommended that the voltages on the two
LEDs be kept within 1 V of one another during operation. The
user can disable one LED and use the other LED only, if desired.
MODES OF OPERATION
When the enable pin is high, the I2C-compatible interface can
be used to set the ADP1660 to one of seven modes of operation.
These modes are configured using the LED_MOD bits (Bits[2:0])
in Register 0x01 (see Table 7).
Table 7. Modes of Operation Set by the LED_MOD Bits
LED_MOD Bits Operating Mode
000 Standby mode, consuming 3 µA typical
(default)
001 Fixed 5 V output mode
010 Assist light mode with continuous LED current
011 Flash mode with LED currents up to 750 mA
available for up to 1.6 sec
100 Independent trigger mode with timeout
enabled (LED outputs are disabled if they are
on longer than the timer value configured by
the FL_TIM bits)
101 Independent trigger mode with timeout
disabled (FL_TIM value is ignored)
110 Fixed 5 V output mode with torch mode (total
output current must be below 500 mA)
111 Reserved
INPUT VOLTAGE = 2.7V TO 5.0V
CIN
L1 10µF
1µF
PGND
VIN SW
COUT
10µF
PGND
VOUT
2.4V
UVLO
CURRENT
SENSE
5.5V
EN
SCL
SDA
STROBE
PWM
CONTROLLER
INTERFACE
AND
CONTROL
TORCH
TxMASK
TORCH
OVP
FAULT
REGISTER
IC THERMAL
SENSING
HP LED
DRIVER
HP LED
DRIVER
CURRENT
SENSE LED1
CURRENT
SENSE
HP LED
SHORT
HIGH POWER LED
CURRENT CONTROL
LED2
UP TO
750mA
UP TO
750mA
PGND
PGND
IO_CFG
GPIO
SGND
PGND
AGND
PGND
Figure 16. Detailed Block Diagram
Rev. 0 | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ADP1660.PDF ] | |
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