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PDF ADP1653 Data sheet ( Hoja de datos )
| Número de pieza | ADP1653 | |
| Descripción | High Power Flash/Torch LED Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP1653 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Compact, High Efficiency, High Power
Flash/Torch LED Driver with Dual Interface
ADP1653
FEATURES
Small 6.4 mm × 7.2 mm solution
2.2 μH power inductor
92% peak efficiency
Tx masking within 50 μs
2.1 A, 12 V power switch
Pin-selectable interface: 2-bit logic or I2C®
Programmable flash and torch current
Up to 200 mA in torch mode
Up to 500 mA in flash mode
Programmable indicator LED current up to 20 mA
Programmable timer register: up to 820 ms flash timeout
2.75 V to 5.5 V input voltage range
Low noise, 1.2 MHz PWM operation
Safety features
Interrupt output pin
Fault condition register
Short-circuit protection
Output overvoltage protection
Thermal overload protection
Integrated current limit and soft start
Small 3 mm × 3 mm, 16-lead LFCSP footprint
APPLICATIONS
Camera-enabled cellular phones, smart phones
Digital still cameras, camcorders, PDAs
GENERAL DESCRIPTION
The ADP1653 is a very compact, high efficiency, high power,
camera-flash LED driver optimized for cellular phones. The
device’s high efficiency and dynamic LED current control
improve flash brightness and picture quality in dimly lit
environments. Efficiency peaks at 92% and is higher than
charge pump solutions over the Li-Ion battery range.
The device has a dual-mode interface that is configurable to 2-bit
logic or an I2C interface. The indicator and high power LED
currents are programmable with external resistors or through the
I2C interface. To maximize overall flash brightness, the ADP1653
offers an input to reduce flash LED current in less than 50 μs,
referred to as the Tx mask. Tx masking reduces battery stress by
scaling back flash LED current during an RF transmission.
The ADP1653 solution requires only four external components
in I2C mode and fits in a 6.4 mm × 7.2 mm space. The part inte-
grates multiple safety features such as soft start, flash timeout,
output current limit, thermal protection, and overvoltage
protection.
The ADP1653 operates over the −40°C to +125°C junction
temperature range.
OPTIONAL
TxMASK
TYPICAL OPERATING CIRCUIT
INPUT VOLTAGE = 2.75V TO 5.5V
ON ON
OFF OFF
2.2µH
4.7µF
UP TO 10.2V
16 15 14
STR EN VDD
1 SETT
2 SETF
ADP1653
4.7µF
13
LX
PGND 12
INT 11
ONE
OR
TWO
LEDs
3 CTRL1/SCL
INTF 10
4 CTRL0/SDA
HPLED 9
SETI ILED OUT GND
5678
VDD
Figure 1.
Rev. A
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.
PCB LAYOUT
LI-ION +
GND
INPUT CAPACITOR
INDUCTOR
L1 C1
SCHOTTKY DIODE
D1
7.2mm
R5
R4
ADP1653
C2 TO WHITE
LEDs
OUTPUT CAPACITOR
PGND
L = FDSE0312-2R2
CIN = GRM219R61A475K
D1 = BAT20J
COUT = GRM21BR61C475K
FROM WHITE
LEDs
OPTIONAL (Tx MASK ONLY)
6.4mm
Figure 2.
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
©2007 Analog Devices, Inc. All rights reserved.
1 page  
ADP1653
I2C TIMING SPECIFICATIONS
Table 2.
Parameter
fSCL
tHIGH
tLOW
tSU, DAT
tHD, DAT1
tSU, STA
tHD, STA
tBUF
tSU, STO
tR
tF
tSP
CB2
Min
0.6
1.3
100
0
0.6
0.6
1.3
0.6
20 + 0.1 CB
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 A master device must provide a hold time of at least 300 ns for the SDA signal (referred to the VIH minimum of the SCL signal) to bridge the undefined region of the
SCL falling edge.
2 CB is the total capacitance of one bus line in picofarads.
SDA
tLOW
tR tSU, DAT
tF tF
tHD, STA
SCL
S tHD, DAT
S = START CONDITION
Sr = REPEATED START CONDITION
P = STOP CONDITION
tHIGH
tSU, STA
Sr
Figure 3. I2C Interface Timing Diagram
tSP tR
tBUF
tSU, STO
P
S
Rev. A | Page 5 of 24
5 Page 
1
2
3
4
100ms/DIV
CHANNEL 1 (IL) 0.5A/DIV
CHANNEL 2 (IHPLED) 0.2A/DIV
CHANNEL 3 (INT) 5V/DIV
CHANNEL 4 (STR) 5V/DIV
Figure 17. Flash Untimed Mode, Two LEDs, Timer = 300 ms,
IHPLED = 380 mA, VDD = 3.6 V
2.5
HIGH
2.3
MEDIUM
2.1
1.9
LOW
1.7
1.5
–40
10 60
TEMPERATURE (°C)
110
Figure 18. Typical Current Limit vs. Temperature;
Low, Medium, and High Current Limit Parts
0.20
0.18
0.16
0.14
0.12
VDD = 3.6V
0.10
0.08
VDD = 3V
0.06
0.04
0.02
0
–40
VDD = 5.5V
10 60 110 125
TEMPERATURE (°C)
Figure 19. Shutdown Current vs. Temperature, EN = 0 V
ADP1653
35
30 VDD = 5.5V
25 VDD = 3.6V
20
VDD = 3V
15
10
5
0
–50 0
50 100 125
TEMPERATURE (°C)
Figure 20. Quiescent Current vs. Temperature,
EN = VDD, LED Functions Disabled
1.6
1.4 ILED ENABLED
1.2
1.0
0.8
0.6
0.4
0.2
IQ = 21.5μA
0
0123456
VDD (V)
Figure 21. Quiescent Current vs. Temperature, VDD Swept from 5.5 V to 0 V,
ILED Active at 2.5 mA Until UVLO Threshold
1.220
1.215
1.210
1.205
1.200
1.195
5.5V
3V
3.6V
1.190
1.185
1.180
1.175
1.170
–40
–15
10 35 60
TEMPERATURE (°C)
85
110
Figure 22. Oscillator Frequency vs. Temperature vs. VDD
Rev. A | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADP1653.PDF ] | |
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