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ADP1655 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ADP1655
기능 Dual LED Flash Driver
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ADP1655 데이터시트, 핀배열, 회로
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.




ADP1655 pdf, 반도체, 판매, 대치품
ADP1655
Parameter1
SAFETY FEATURES
Thermal Shutdown Threshold
TJ Rising
TJ Falling
Overvoltage Threshold
Coil Peak Current Limit
LED_OUT Short-Circuit Detection
Comparator Reference Voltage
LED Counting Comparator
Threshold Voltage
Conditions
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)
LED value setting = 0 (00 binary)
LED value setting = 1 (01 binary)
LED value setting = 2 (10 binary)
LED value setting = 3 (11 binary)
1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
2 Two LEDs are used for this parameter.
Min Typ Max Unit
150 °C
140 °C
9.0 9.5 10.1 V
1.13 1.25 1.38 A
1.35 1.5 1.65 A
1.58 1.75 1.93 A
1.8 2.0 2.2 A
1.2 1.3 V
4.3 V
4.6 V
4.0 V
4.9 V
RECOMMENDED SPECIFICATIONS: INPUT AND OUTPUT CAPACITANCE AND INDUCTANCE
Table 2.
Parameter
CAPACITANCE
Input
Output
MINIMUM AND MAXIMUM INDUCTANCE
Symbol
CMIN
L
Conditions
TA = −40°C to +125°C
TA = −40°C to +125°C
TA = −40°C to +125°C
Min Typ Max Unit
4.0 μF
4.0 20 μF
1.5 2.8 μH
Rev. 0 | Page 4 of 24

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ADP1655 전자부품, 판매, 대치품
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
BALL A1
INDICATOR
1
2
PGND
A
SGND
3
VIN
SW TORCH TX_MASK
B
VOUT STROBE I2C/EN
C
LED_OUT SDA/EN2 SCL/EN1
D
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
Figure 4. Pin Configuration
ADP1655
Table 5. Pin Function Descriptions
Pin No. Mnemonic Type
A1 PGND
Ground
A2 SGND
Ground
A3 VIN
Supply
B1 SW
Output
B2
TORCH
Digital Input
B3 TX_MASK Digital Input
C1 VOUT
Output
C2
STROBE
Digital Input/
Output
C3 I2C/EN Digital Input
D1 LED_OUT Output
D2 SDA/EN2 Digital Input/
Output
D3 SCL/EN1 Digital Input
Description
Ground for Internal Switching FET.
Connect this pin at a single point to the power ground.
Connect the battery between VIN and PGND. Bypass VIN with a 10 μF, 6.3 V or greater X5R/X7R
capacitor.
Connect a 2.2 μH inductor between SW and the battery.
This pin enables the torch, provided that the device is not in flash or assist light mode.
Connect a digital signal to the TX_MASK pin. When the logic level is driven high during a flash
event the current is reduced to the torch level.
VOUT senses the output voltage of the boost converter and provides the input voltage to the LED
current source. The VOUT pin features a comparator to detect an overvoltage condition if the LED
string is open circuited. Connect a 10.0 μF capacitor between VOUT and PGND.
The STROBE input is used to synchronize the timing of the camera module to the LED driver in
I2C-compatible interface mode. In 2-bit logic interface mode, this acts as an output, indicating the
number of LEDs attached. STROBE = high indicates two LEDs, whereas STROBE = low indicates
one LED.
A logic low selects the 2-bit logic interface, whereas logic high selects I2C-compatible interface. If
I2C/EN is low and SDA/EN2 and SCL/EN1 are low, the driver enters shutdown mode with
consumption < 1 μA.
White LED Anode Connection. Connect LED_OUT to the anode of the white LED. LED_OUT is
internally connected to a programmable PMOS current source, which regulates the LED current.
Data Input/Output (SDA). In 2-bit logic interface mode, SDA/EN2 is the second input bit of the
digital interface.
Second Input Bit (EN2). In I2C mode, SDA is the data input/output of the I2C-compatible interface.
Clock Input (SCL). In 2-bit logic interface mode, SCL/EN1 is the first input bit of the digital interface.
First Input Bit (EN1). In I2C mode, SCL is the clock input of the I2C-compatible interface.
Rev. 0 | Page 7 of 24

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