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PDF ADP1649 Data sheet ( Hoja de datos )
| Número de pieza | ADP1649 | |
| Descripción | 1.0 A LED Flash Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
FEATURES
Ultracompact solution
Small, 2 mm × 1.5 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 the LED
Improved LED thermals
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 of up to 1000 mA in flash mode for 1 LED with
±7% accuracy over all conditions
Currents of up to 200 mA in torch mode
Programmable dc battery current limit (4 settings)
Programmable flash timer up to 1600 ms
Low VBAT mode to reduce LED current automatically
4-bit ADC for LED VF, die/LED temperature readback
Control
I2C-compatible control registers
External strobe and torch input pins
2 transmitter mask (TxMASK) inputs
Safety
Thermal overload protection
Inductor fault detection
LED short-circuit and open-circuit protection
APPLICATIONS
Camera enabled cellular phones and smart phones
Digital still cameras, camcorders, and PDAs
GENERAL DESCRIPTION
The ADP1649 is a very compact, highly efficient, single 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 MHz synchronous
inductive boost converter, an I2C-compatible interface, and a
1000 mA current source. The high switching frequency enables
the use of a tiny, 1 mm high, low cost, 1 µH power inductor, and
the current source permits 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 to minimize battery current draw during flash
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
1.0 A LED Flash Driver with
I2C-Compatible Interface
ADP1649
FUNCTIONAL BLOCK DIAGRAM
INPUT VOLTAGE = 2.7V TO 5.0V
1.0µH
10µF
TxMASK1/TORCH
TxMASK2/ILED/ADC
GPIO1
GPIO2
VIN SW
VOUT
ADP1649
STROBE
LED_OUT
SCL
SDA
EN
SGND
PGND
10µF
MAX 1.0A
Figure 1.
Li-ION +
C1
L1
INDUCTOR
PGND
C2
Li-ION +
DIGITAL
INPUT/
OUTPUT
AREA = 16.4mm2
LED
ANODE
Figure 2. PCB Layout (WLCSP)
events. A programmable dc battery current limit safely maximizes
LED current for all LED VF and battery voltage conditions.
Two independent TxMASK inputs permit the flash LED current
and battery current to reduce quickly during a power amplifier
current burst. The I2C-compatible interface enables the pro-
grammability of timers, currents, and status bit readback for
monitoring the operation and for safety control.
The ADP1649 is available 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
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
1 page  
ADP1649
Parameter2
DIGITAL INPUTS/GPIOx
Input Logic
Low Voltage
High Voltage
GPIO1, GPIO2, STROBE Pull-Down
Torch Glitch Filtering Delay
INDICATOR LED
LED Current Accuracy
Short-Circuit Detection Threshold
Open-Circuit Detection Threshold
ADC
Resolution
Error
Input Voltage Range, GPIO2
SAFETY FEATURES
Maximum Timeout For Flash
Timer Accuracy
DC Current Limit
Low VBAT Mode Transition Voltage
Error
Hysteresis
Coil Peak Current Limit
Overvoltage Detection Threshold
LED_OUT Short-Circuit Detection
Comparator Reference Voltage
Thermal Shutdown Threshold
TJ Rising
TJ Falling
Test Conditions/Comments
From torch rising edge to device start
External voltage mode
VF mode, TJ = 25°C
VF mode, TJ = −40°C to +125°C
External voltage mode
DC current value setting = 0 (00 binary)
DC current value setting = 1 (01 binary)
DC current value setting = 2 (10 binary)
Peak current value setting = 0 (00 binary)
Peak current value setting = 1 (01 binary)
Peak current value setting = 2 (10 binary)
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.
Data Sheet
Min Typ Max Unit
1.26
390
5.5 7
0.54 V
V
kΩ
7.5 ms
−22 +22 %
1.2 V
2.45 V
4 Bits
0 ±1 LSB
±1 LSB
±1.5 LSB
0 0. 5 V
1600
ms
−7.0 +7.0 %
1.35 1.5 1.65 A
1.55 1.75 1.95 A
1.8 2.0 2.2 A
3.2 %
50 mV
1.55 1.75 1.95 A
2.02 2.25 2.5 A
2.47 2.75 3.0 A
5.15 5.5 5.9 V
1.2 1.3 V
150 °C
140 °C
Rev. 0 | Page 4 of 28
5 Page 
ADP1649
1111
1110
1100
1010
1000
0110
0100
0010
0000
0
25 50 75 100 125 150
DIE TEMPERATURE (°C)
Figure 17. ADC Die Temperature Mode Transfer Characteristic
1111
1110
1100
1010
1000
0110
0100
0010
0000
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2
LED_OUT VOLTAGE (V)
Figure 18. ADC LED VF Mode Transfer Characteristic
4.4
3.760
3.755
VIN = 5.0V
3.750
3.745
3.740
3.735
VIN = 3.6V
3.730
3.725
VIN = 2.7V
3.720
3.715
3.710
–40 10
60 110
TEMPERATURE (°C)
Figure 19. ADC LED VF Mode, Code 1000, Midpoint vs. Temperature
Data Sheet
295
VIN = 5V
294
293
292
291
290
VIN = 3.6V
289
288
VIN = 2.7V
287
286
–40
10
60 110
TEMPERATURE (°C)
Figure 20. ADC External Voltage Mode, Code 1000, Midpoint vs. Temperature
0.5
VIN = 3.2V
VIN = 3.6V
0 VIN = 4.2V
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–40
10
60 110
TEMPERATURE (°C)
Figure 21. LED Current Error vs. Temperature, ILED = 800 mA
1.0
VIN = 3.2V
VIN = 3.6V
0.5 VIN = 4.2V
0
–0.5
–1.0
–1.5
–2.0
–2.5
–40
10 60
TEMPERATURE (°C)
110
Figure 22. LED Current Error vs. Temperature, ILED = 1000 mA
Rev. 0 | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ADP1649.PDF ] | |
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