Compact, High Efficiency, High Power,
Flash/Torch LED Driver with Dual Interface
ADP1653
Data Sheet
FEATURES
GENERAL DESCRIPTION
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
The ADP1653 is a very compact, high efficiency, high power,
camera flash LED driver optimized for cellular phones. The
high efficiency and dynamic LED current control of the device
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 integrates 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.
APPLICATIONS
Camera-enabled cellular phones, smart phones
Digital still cameras, camcorders, PDAs
TYPICAL OPERATING CIRCUIT
PCB LAYOUT
INPUT VOLTAGE = 2.75V TO 5.5V
GND
INPUT CAPACITOR
LI-ION +
4.7µF
INDUCTOR
2.2µH
ON
OFF
ON
C1
L1
UP TO 10.2V
OFF
SCHOTTKY DIODE
4.7µF
15
14
STR
EN
VDD
13
D1
LX
OPTIONAL
1
SETT
PGND 12
TxMASK
2
SETF
INT 11
3
CTRL1/SCL
ADP1653
ONE
OR
TWO
LEDs
7.2mm
C2
OUTPUT CAPACITOR
INTF 10
PGND
R5
4
L = FDSE0312-2R2
CIN = GRM219R61A475K
D1 = BAT20J
COUT = GRM21BR61C475K
HPLED 9
CTRL0/SDA
SETI
ILED
OUT
GND
5
6
7
8
06180-001
R4
VDD
TO WHITE
LEDs
Figure 1.
ADP1653
OPTIONAL (Tx MASK ONLY)
6.4mm
FROM WHITE
LEDs
06180-036
16
Figure 2.
Rev. C
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ADP1653
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Typical Performance Characteristics ..............................................9
Applications ....................................................................................... 1
Theory of Operation ...................................................................... 13
General Description ......................................................................... 1
White LED Driver ...................................................................... 13
Typical Operating Circuit ................................................................ 1
2-Bit Logic Interface Mode (INTF = 1) ................................... 14
PCB Layout ........................................................................................ 1
I2C Interface Mode (INTF = 0)................................................. 14
Revision History ............................................................................... 2
Turning on the Flash and Watchdog Timer ........................... 15
Specifications..................................................................................... 3
Safety Features ............................................................................ 16
I C Timing Specifications ............................................................ 5
Applications Information .............................................................. 17
Absolute Maximum Ratings ............................................................ 6
Flash Current Foldback During Transmit Pulse .................... 17
Thermal Resistance ...................................................................... 6
External Component Selection ................................................ 18
Boundary Condition .................................................................... 6
PCB Layout ................................................................................. 20
ESD Caution .................................................................................. 6
Outline Dimensions ....................................................................... 22
Pin Configuration and Function Descriptions ............................. 7
Ordering Guide .......................................................................... 22
2
REVISION HISTORY
4/2017—Rev. B to Rev. C
Changed CP-16-3 to CP-16-27 .................................... Throughout
Changes to Figure 2 .......................................................................... 1
Changes to Figure 4 and Table 5 ..................................................... 7
Changes to Figure 34 ...................................................................... 20
Updated Outline Dimensions ....................................................... 22
Changes to Ordering Guide .......................................................... 22
9/2007—Rev. A to Rev. B
Changes to Table 1 ............................................................................ 3
Changes to Table 5 ............................................................................ 7
Changes to I2C Interface Mode (INTF = 0) Section .................. 14
Changes to Safety Features Section .............................................. 16
Inserted Table 9 and Table 10........................................................ 18
Inserted Table 11 and Table 12...................................................... 19
1/2007—Revision A: Initial Version
Rev. C | Page 2 of 24
Data Sheet
ADP1653
SPECIFICATIONS
VDD = 3.0 V to 5.5 V, TJ = −40°C to +125°C, unless otherwise noted. 1
Table 1.
Parameter
SUPPLY
Input Voltage Range 2
Undervoltage Lockout Threshold
Shutdown Current
Soft Power-Down Current
Operating Current 3
LX Leakage
HPLED Leakage
THERMAL SHUTDOWN
Thermal Shutdown Threshold
INPUTS
EN, STR, CTRL1/SCL, CTRL0/SDA
Input Logic Low Voltage
Input Logic High Voltage
SETI, SETT, SETF
Input Logic High Voltage
INTF
Input Logic Low Voltage 4
Input Logic High Voltage4
INT OUTPUT
Logic Low Output Voltage
Logic High Leakage Current
SETI, SETT, SETF REFERENCE VOLTAGE
INDICATOR LED
Current Sink Headroom
INTF = 1, SETI Current Source
INTF = 0
WHITE LED DRIVER
LX
Switching Frequency
Current Limit
On Resistance
OUT
Soft Start Ramp
Overvoltage Threshold
Bias Current 5
Conditions
VDD rising
VDD falling
EN = GND, TJ = −40°C to +85°C
INTF = 0, EN = VDD, ILED register = 0,
HPLED register = 0, TJ = −40°C to +85°C
INTF = 1, EN = VDD, (CTRL1, CTRL0) = (0, 0),
TJ = −40°C to +85°C
INTF = 0, EN = VDD, ILED register = 001,
HPLED register = 0
INTF = 1, (CTRL1, CTRL0) = (0, 1), RSETI = 200 kΩ
INTF = 0, EN = VDD, HPLED register = 00001
INTF = 1, (CTRL1, CTRL0) = (1, x)
TJ = −40°C to +85°C
TJ = −40°C to +85°C
Min
3.0
2.80
2.58
TJ rising
Typ
Max
Unit
2.9
2.7
0.1
19
5.5
2.95
2.75
1
45
V
V
V
µA
µA
19
45
µA
500
700
µA
500
1.6
1.6
0.05
0.03
700
3
3
0.5
0.5
µA
mA
mA
µA
µA
155
TJ = −40°C to +85°C
TJ = −40°C to +125°C
TJ = −40°C to +85°C
TJ = −40°C to +125°C
°C
0.54
0.48
1.26
1.27
V
V
V
V
1.4
V
VDD/2 − 0.6
V
V
1.19
0.05
1.22
0.4
0.5
1.24
V
µA
V
1
14.5
2.0
2.0
14.5
17.5
2.5
2.5
17.5
21.5
3.0
3.0
21.5
V
mA
mA
mA
mA
1.2
2.1
250
1.3
2.45
420
MHz
A
mΩ
10.5
12
V/ms
V
µA
VDD/2 + 0.6
ISINK = −3 mA
VHEADROOM = VDD − VF (ILED)
RSETI = 25 kΩ
RSETI = 200 kΩ
ILED register = 1 (001 binary), SETI = VDD
ILED register = 7 (111 binary), SETI = VDD
1.1
1.8
VDD rising
VOUT = 10 V
Rev. C | Page 3 of 24
9.8
18
10.15
ADP1653
Parameter
HPLED
Regulation Voltage 6
Regulation Current
INTF = 1, Torch Mode
Flash Mode
INTF = 0, Flash Mode
Torch Mode
Step Size for HPLED LSB Change
Maximum Flash Timeout
SETF RESPONSE (TRANSMIT MASKING FUNCTION)7
Data Sheet
Conditions
Min
Typ
Max
Unit
Boost active, two high power LEDs (HPLEDs)
in series
0.23
0.32
0.42
V
RSETT = 50 kΩ or SETT = VDD
RSETT = 125 kΩ
RSETF = 50 kΩ
RSETF = 500 kΩ
HPLED register = 11111 (binary), SETF = VDD
HPLED register = 11000 (binary), SETF = VDD
HPLED register = 00110 (binary), SETF = VDD
HPLED register = 00001 (binary), SETF = VDD
SETF = VDD
INTF = 0 or 1, 983,040 × oscillator cycles
110
35
460
35
460
365
110
38
125
50
500
50
500
395
125
50
15
820
145
60
550
60
550
435
145
60
mA
mA
mA
mA
mA
mA
mA
mA
mA
ms
HPLED current = 335 mA to 140 mA
HPLED current = 140 mA to 335 mA
22
24
µs
µs
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). Typical values are at TA = 25°C, VDD = 3.6 V.
This is the VDD input voltage range over which the rest of the specifications are valid. The part operates as expected until VDD goes below the UVLO threshold.
This is the current into the VDD pin. Additional current can flow into the indicator LED or HPLED, depending on the mode selected.
4
INTF should be tied to GND (INTF = 0) for I2C interface or to VDD (INTF = 1) for hardwire interface. All other digital inputs are 1.8 V compatible.
5
This bias current is active only when the high power LED and/or indicator LED functions are enabled.
6
This specification is not valid during minimum on-time operation of the boost converter (one LED case) when excess voltage is dropped across the HPLED pin.
7
This specification is not production tested but is based on bench evaluation. It is based on the typical two-LED application circuit using a 100 kΩ resistor from SETF to GND,
and a 160 kΩ resistor to a 1.8 V Tx mask logic signal with
