DATA SHEET
AHK3293
Three-Channel 1x LED Driver
General Description
Features
The AHK3293 is a linear current-sink LED driver, capable
of driving one, two or three LEDs up to 30.2mA each.
Featuring individual low resistance, low drop-out voltage
current sinks, the AHK3293 allows the LEDs to be regulated directly from a Lithium Ion/Polymer battery without the need for an additional step-up power supply,
thereby reducing the external component count, eliminating switching noise and maximizing efficiency.
• 2.7V to 5.5V Input Supply Range
• Drives up to 3 LEDs at up to 30.2mA each
• Low-Dropout, Low Resistance Current Sinks
▪ Typically 40.5mV at Full Scale
• Linear LED Output Current Control
▪ S2Cwire Interface
• Single-wire
• 32 Steps
• ±10% LED Output Current Accuracy
• ±3% LED Output Current Matching
• Low Current Shutdown Mode
• Low-cost 6-pin SOT23 Package
Skyworks' Simple Serial Control™ (S2Cwire™) interface
is used to enable, disable, and set the LED drive current
for 32-level linear scale LED brightness control. To minimize the use of external components the LED current is
set internally to a maximum of 30.2mA.
Applications
The AHK3293 is packaged in a Pb-free 6-pin SOT23
package and operates over the -40 to +85OC temperature range.
• Entry Level Mobile Phones
• Indicator LEDs
• Keyboard Backlight
• MP3 Players
Typical Application
Input Voltage
2.7 to 5.5V
CIN
EN/SET
S2Cwire
Interface
IN
AHK3293
EN
D1
D2
GND D3
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1
DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Pin Descriptions
Pin #
Symbol
Function
1
EN
I
2
GND
I/O
3
IN
I
4
D3
O
5
D2
O
6
D1
O
Description
S2Cwire serial input. EN is used for ON/OFF control. EN is also the data input for the S2Cwire
interface used to control the 32 levels of LED brightness according to the maximum current set
internally.
Ground. Connect this pin to the system ground.
Input power pin. Connect IN to the power source, typically the battery. Bypass IN to GND with
a 1μF or larger ceramic capacitor.
Backlight LED 3 current sink output. Connect the cathode of LED 3 to D3. If not used, connect
D3 to IN.
Backlight LED 2 current sink output. Connect the cathode of LED 2 to D2. If not used, connect
D2 to IN.
Backlight LED 1 current sink output. Connect the cathode of LED 1 to D1. If not used, connect
D1 to IN.
Pin Configuration
SOT23-6
(Top View)
2
EN
1
6
D1
GND
2
5
D2
IN
3
4
D3
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DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Absolute Maximum Ratings1
TA = 25OC unless otherwise noted.
Symbol
VN
VEN
Description
IN, D1, D2, D3 to GND
VEN to GND
Value
Units
-0.3 to 6.0
-0.3 to VIN + 0.3
V
Value
Units
Thermal Information2
Symbol
ΘJA
PD
TJ
TA
TLEAD
Description
Thermal Resistance3
Maximum Power Dissipation
Junction Temperature Range
Operating Temperature Range
Maximum Soldering Temperature (at Leads)
150
667
-40 to 150
-40 to 85
300
C/W
mW
O
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
3. Derate 5.3mW/°C above 25°C.
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3
DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Electrical Characteristics1
IN = EN = 3.6V, CIN = 1µF; TA = -40oC to 85oC unless otherwise noted. Typical values are at TA = 25oC.
Symbol
Description
Conditions
Power Supply
VIN
Input Voltage Range
IIN
Input Operating Current
IIN(SHDN)
Input Shutdown Current
VDO
Typ
Max
Units
5.5
V
2.5
4.0
mA
1
125
85
µA
40.5
36
2.7
Current Sink Dropout Voltage
2
LED Current Sink Outputs
ID(MAX)
D1, D2, D3 Current Accuracy
ΔID(MAX)
D1, D2, D3 Current Matching
tS
Startup Period
EN and S2Cwire Control
VEN(L)
EN Input Low Threshold
VEN(H)
EN Input High Threshold
IEN
EN Input Leakage Current
TEN(LOW)
EN Serial Interface Low Time
TEN(HI_ MIN)
Minimum EN High Time
TEN(HI_ MAX)
Maximum EN High Time
TEN(OFF)
EN Off Timeout
TEN(LAT)
EN Latch Timeout
Min
ID1 = ID2 = ID3= 30.2mA (DATA 1) excluding
ID1, ID2, and ID3
IN = 5.5V; EN = GND
ID1 = ID2 = ID3= 30.2mA (DATA 1)
ID1 = ID2 = ID3= 15.2mA (DATA 16)
ID1 = ID2 = ID3= 30.2mA (DATA 1), TA = 25°C
ID1 = ID2 = ID3= 30.2mA (DATA 1)
EN = IN
EN = IN = 5V
27.18
30.20
±3
150
1.4
-1
0.3
mV
33.22
mA
%
µs
0.4
V
V
µA
µs
ns
µs
µs
µs
1
75
50
75
500
500
1. The AHK3293 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization and correlation with statistical process controls.
2. The current sink drop-out voltage is defined as when the current at D1 or D2 or D3 drops to 90% of its nominal value.
4
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DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Typical Characteristics
Shutdown Current vs. Temperature
2.2
0.007
2.0
0.006
1.8
IIN(SHDN) (µA)
Quiescent Current (mA)
Quiescent Current vs. Input Voltage
1.6
1.4
1.2
1.0
0.8
0.6
2.7
0.005
0.004
0.003
0.002
VIN = 5.5V
VIN = 2.7V
0.001
2.98
3.26
3.54
3.82
4.1
4.38
4.66
4.94
5.22
0.000
-40
5.5
-15
Input Voltage (V)
Line Regulation
60
0.9
Part 1
Part 2
0.7
LED Current (%)
90.0
89.5
89.0
88.5
85
(30.2mA/ch)
90.5
LED Current (mA)
35
Line Regulation Accuracy
(30.2mA/ch)
0.5
0.3
0.1
-0.1
-0.3
-0.5
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
88.0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Supply Voltage (V)
Supply Voltage (V)
Sink Current Matching
Efficiency vs. Input Voltage
(30.2mA/ch)
(VF = 2.5V)
31
100
90
Sink Current (mA)
80
Efficiency (%)
10
Temperature (°C)
70
60
50
40
30
20
10
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
30.5
30
29.5
29
ISINK1
ISINK2
ISINK3
IAVG
28.5
28
-40
-15
10
35
60
85
Temperature (°C)
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5
DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Typical Characteristics
Current Sink Dropout Voltage vs. Temperature
Current Sink Dropout Voltage vs. Temperature
(Data = 1)
(Data = 16)
50
Dropout Voltage (mV)
Dropout Voltage (mV)
60
50
40
30
20
Sink 1
Sink 2
Sink 3
10
0
-40
-15
10
35
60
40
35
30
25
20
15
5
1.2
1
1
0.8
0.8
VIL (V)
VIH (V)
1.2
0.6
35
60
85
0.6
0.4
85°C
25°C
-40°C
0.2
2.98
3.26 3.54
3.82
4.1
4.38
4.66
4.94
5.22
85°C
25°C
-40°C
0.2
0
2.7
5.5
VIN (V)
2.98
3.26 3.54
3.82
4.1
4.38
4.66
4.94
5.22
5.5
VIN (V)
EN Latch Timeout vs. Input Voltage
EN Off Timeout vs. Input Voltage
350
400
350
TOFF (µs)
300
TLAT (µs)
10
Input Low Voltage vs. Input Voltage
0.4
250
200
85°C
25°C
-40°C
150
VIN (V)
300
250
200
85°C
25°C
-40°C
150
100
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
6
-15
Temperature (°C)
Input High Voltage vs. Input Voltage
0
2.7
Sink 1
Sink 2
Sink 3
10
0
-40
85
Temperature (°C)
45
100
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
VIN (V)
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DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Typical Characteristics
Turn On
Turn Off
(VIN = 3.6V; 30.2mA/ch)
(VIN = 3.6V; 30.2mA/ch)
EN/SET
(2V/div)
EN/SET
(2V/div)
VF
(1V/div)
VF
(1V/div)
IIN
(100mA/div)
IIN
(100mA/div)
Time (100µs/div)
Time (100µs/div)
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7
DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Functional Block Diagram
D1
IN
D2
D3
AGND
3
EN
S2Cwire
Control
Functional Description
The AHK3293 is an entry level driver IC, designed to
drive up to three white LEDs. The AHK3293 operates
directly from a 2.7V to 5.5V power source and enables
and controls the current to the LEDs. LED current is individually controlled through integrated current sinks powered from an external power supply. Low resistance and
low-drop out voltage current sinks allow the LEDs to
operate very close the input supply voltage, eliminating
the need for an additional noisy boost power supplies.
The AHK3293 requires only one external component, a
1μF ceramic input capacitor (CIN). The AHK3293 can drive
three constant output sinks (D1, D2 and D3) each with a
maximum current of up to 30.2mA which is set internally.
Skyworks' S2Cwire serial interface enables the AHK3293
and changes the current sink magnitude through the EN
pin, thereby changing the LED current.
S2Cwire Serial Interface
The LED output current of the AHK3293 is controlled by
Skyworks' S2Cwire serial interface. Since the LED current
is programmable, no PWM or additional control circuitry is
8
IREF
DAC
needed to control LED brightness. This feature greatly
reduces the burden on a microcontroller or system IC to
manage LED or display brightness, allowing the user to
“set it and forget it.” With its high-speed serial interface
(1MHz data rate), the LED current can be changed quickly and easily. Also the non-pulsating LED current reduces
system noise and improves LED reliability.
The S2Cwire interface relies on the number of rising
edges to the EN/SET pin to set the register. A typical
write protocol is a burst of EN rising edges, followed by
a pause with EN held high for at least tLAT (500μs). The
programmed current is then seen at the current sink
outputs. When EN is held low for an amount of time longer than tOFF (500μs), the AHK3293 enters into shutdown
mode and draws less than 1μA from the input and the
internal data register is reset to zero.
The AHK3293 serial interface reduces the LED current on
each rising pulse of the enable input. If the AHK3293 is
in shutdown, the first rising edge of the EN input turns
on the LED driver to the maximum current. Successive
rising edges decrease the LED current as shown in Table
1 and Figure 1 for the AHK3293.
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DATA SHEET
AHK3293
Three-Channel 1x LED Driver
THI
TLO
TOFF
TLAT
EN/SET
1
2
n-1
Data Reg
n ≤ 16
0
n-1
0
Figure 1: S2Cwire Serial Interface Timing.
Data
EN
Rising
Edges
D1- D3
Output
Current
(mA)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
30.2
29.2
28.3
27.3
26.3
25.3
24.4
23.4
22.4
21.4
20.5
19.5
18.5
17.5
16.6
15.6
Data
EN
Rising
Edges
D1-D3
Output
Current
(mA)
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
14.6
13.6
12.7
11.7
10.7
9.7
8.8
7.8
6.8
5.8
4.9
3.9
2.9
1.9
1.0
0.5
Table 1: AHK3293 LED Current Settings.
LED Selection
The AHK3293 is specifically intended for driving white
LEDs. However, the device design will allow the AHK3293
to drive most types of LEDs with forward voltage specifications typically ranging from 2.2V to 4.7V depending
upon supply voltage. LED applications may include
mixed arrangements for display backlighting, keypad
display, and any other application needing a constant
current sink generated from a varying input voltage.
Since the D1, D2 to D3 constant current sinks are
matched with negligible supply voltage dependence, the
constant current channels will be matched regardless of
the specific LED forward voltage (VF) levels. The low
dropout current sinks in the AHK3293 maximize performance and make it capable of driving LEDs with high
forward voltages. Multiple channels can be combined to
obtain a higher LED drive current without complication.
Shutdown
Code vs. LED Current
Since the current switches are the only power supplies
for all loads, there is no leakage current when all sink
switches are disabled. To activate the shutdown operation, the EN input for the AHK3293 should be strobed low
for longer than tOFF (500μs). In this state, the AHK3293
typically draws less than 1μA from the input. Registers
are reset to 0 in shutdown.
(30mA scale)
35
30
25
Current (mA)
Applications Information
20
15
Additional Applications
10
5
0
1
3
5
7
9
11
13
15
17
19
21
23
25
27
Code
29
31
The current sinks of the AHK3293 can be combined to
drive higher current levels through two LEDs. As an
example, one LED can typically be driven at 60.4mA by
combining the D1-D2 outputs as shown in Figure 3.
Figure 2: AHK3293 Current Profile.
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9
DATA SHEET
AHK3293
Three-Channel 1x LED Driver
VIN
C IN
1μF
IN
AHK3293
EN/SET
D1
EN
D2
D3
GND
Figure 3: AHK3293 Higher Current
Application Circuit.
Capacitor Selection
Careful selection of the external capacitor CIN is important because it will affect turn-on time and transient
performance. Optimum performance will be obtained
when low equivalent series resistance (ESR) ceramic
capacitor is used; in general, low ESR may be defined as
less than 100mΩ. A value of 1μF for the input capacitor
is a good starting point when choosing it. If the constant
current sinks are only programmed for light current levels, then the input capacitor size may be decreased.
Capacitor Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the
AHK3293. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is
lower cost, has a smaller PCB footprint, and is non polarized. Since ceramic capacitors are non-polarized, they
are not prone to incorrect connection damage.
Equivalent Series Resistance
ESR is an important characteristic to consider when
selecting a capacitor. ESR is a resistance internal to a
capacitor that is caused by the leads, internal connec-
10
tions, size or area, material composition, and ambient
temperature. Capacitor ESR is typically measured in milliohms for ceramic capacitors and can range to more
than several ohms for tantalum or aluminum electrolytic
capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1μF are typically made
from NPO or C0G materials. NPO and C0G materials
generally have tight tolerance and are very stable over
temperature.
Larger capacitor values are usually composed of X7R,
X5R, Z5U, or Y5V dielectric materials. Large ceramic
capacitors (i.e., larger than 2.2μF) are often available in
low cost Y5V and Z5U dielectrics, but capacitors larger
than 1μF are not typically required for AHK3293 applications.
Capacitor area is another contributor to ESR. Capacitors
that are physically large will have a lower ESR when
compared to an equivalent material smaller capacitor.
These larger devices can improve circuit transient
response when compared to an equal value capacitor in
a smaller package size.
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DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Evaluation Board User Interface
red LED indicates that power is applied. The evaluation
board is made flexible so that the user can disconnect the
enable line from the microcontroller and apply external
enable signal. External enable signal must be applied to
the EN pin. When applying external enable signal, consideration must be given to the voltage levels. The externally applied voltage should not exceed the supply voltage that is applied to the IN pins of the device (DC+).
The user interface for the AHK3293 evaluation board is
provided by three buttons and two connection terminals.
The board is operated by supplying external power and
pressing individual buttons or button combinations. Table
2 indicates the function of each button or button combination. To power-on the evaluation board, connect a
power supply or battery to the DC- and DC+ terminals. A
User Interface Functionality
Button(s) Pushed
Description
[Push/Release once] D1 to D3 are turned on with 0.5mA per channel. With every push/release the current is increased according to Table 1.
[Push/Release once] D1 to D3 are turned on with 30.2mA per channel. With every push/release the current is decreased according to Table 1.
[Push/Release once] Auto cycling up and down.
UP
DOWN
CYCLE
Table 2: AHK3293 Evaluation Board User Interface.
GND
VIN
1
2
3
IN
JP4
J1
C1
1µF
D1
D2
D3
JP1
JP2
JP3
U1
4
D3
IN
3
5
D2
GND
2
6
D1
EN
1
AHK3293 SOT23-6
J2
R6
100K
VIN
R3
1K
CYCLE
UP
DOWN
0
2 1
4 3
5
0
2 1
4 3
5
0
2 1
4 3
5
SW3
SW2
R2
1K
R1
1K
1
2
3
4
U2
VDD
GP3
GP4
GP5
VSS
GP0
GP1
GP2
8
7
6
5
PIC12F675
SW1
VR4
POT10K
C2
1µF
R4
330
LED2
RED
R5
330
LED1
GRN
Figure 4: AHK3293 Evaluation Board Schematic.
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11
DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Figure 5: AHK3293 Evaluation Board
Figure 6: AHK3293 Evaluation Board
Top Side Layout.
Bottom Side Layout.
AAT3293 EVAL Component Listing
Component
Part Number
Description
Manufacturer
U1
U2
CYCLE, UP, DOWN
R1, R2, R3
R4, R5
R6
C1, C2
LED1
LED2
J1, J2
JP1, JP2, JP3
JP4
D1, D2, D3
AHK3293IGU
PIC12F675
PTS645TL50
Chip Resistor
Chip Resistor
Chip Resistor
GRM185R60J105KE21
CMD15-21VGC/TR8
CMD15-21SRC/TR8
PRPN401PAEN
Chip Resistor
Chip Resistor
LW M673
Three Channel LED driver; SOT23-6 package
8-bit CMOS, FLASH-based μC; 8-pin PDIP package
Switch Tact, SPST, 5mm
1KΩ, 5%, 1/4W; 0603
330Ω, 1%, 1/4W; 0603
100KΩ, 5%, 1/4W; 0603
1µF, 6.3V, X7R, 10%, 0603
Green LED; 0603
Red LED; 0603
Conn. Header, 2mm zip
0Ω, 5%, 1/4W; 0603
0Ω, 5%, 1/2W; 0805
Mini TOPLED White LED; SMD
Skyworks
Microchip
ITT Industries
Vishay
Vishay
Vishay
Murata
Chicago Miniature Lamp
Chicago Miniature Lamp
Sullins Electronics
Vishay
Vishay
OSRAM
Table 4: AHK3293 Evaluation Board Bill of Materials (BOM).
12
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DATA SHEET
AHK3293
Three-Channel 1x LED Driver
Ordering Information
Package
Part Marking1
Part Number (Tape and Reel)2
SOT23-6
6LXYY
AHK3293IGU-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
SOT23-6
2.85 ± 0.15
1.90 BSC
2.80 ± 0.20
0.15 ± 0.07
4° ± 4°
1.10 ± 0.20
1.20 ± 0.25
0.075 ± 0.075
1.575 ± 0.125
0.95 BSC
10° ± 5°
0.40 ± 0.10 × 6
0.60 REF
0.45 ± 0.15
GAUGE PLANE
0.10 BSC
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
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NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202171A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 13, 2012
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