DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
General Description
Features
The AHK1421 is a highly integrated, high efficiency LED
backlight solution for portable appliances including mobile
phones, smartphones, PDAs, PNDs etc. The device operates from a single-cell Li-ion or polymer battery in the
voltage range from 2.7V to 5.5V.
• Input Voltage Range: 2.7 to 5.5V
• Drives up to 6 Series LEDs at 31mA
• Integrated Boost Converter
-- 1MHz Switching Frequency
-- Up to 86% Efficiency
-- Internal Compensation
• 32 Steps - S2Cwire Single Wire Interface
• Shutdown Current < 4µA
• Integrated Protection Features
-- Over-Voltage Protection for Open-LED Faults
-- Over Temperature Protection
• TSOT23-6 package
An integrated boost (step-up) converter provides up to
28V output for driving up to 6 series LEDs. In conjunction
with an external current setting ballast resistor, the
AHK1421 uses a single wire, S2C digital interface to adjust
the output current and therefore brightness, in 32 linear
steps.
The boost switching frequency operates at 1MHz to allow
optimum efficiency and the smallest external L/C filtering
components. Integrated protection features protects
against, open circuit LEDs, short circuits and over temperature conditions.
The AHK1421 is available in a Pb-free TSOT23-6 package.
Applications
• White LED backlight
-- Feature phones
-- Smartphones
-- PDAs
-- PMP
-- PNDs
-- Portable DVD Players
Typical Application
L = 10µH
D1
2.7 - 5.5V
2.2µF
VIN
2.2µF
LX
OUT
AHK1421
S2C
FB
EN/SET
GND
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1
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Pin Descriptions
Pin #
Symbol
Function
1
LX
O
2
GND
GND
3
FB
I
4
5
6
EN/SET
OUT
VIN
I
O
I
Description
Switching node of boost converter. Connect a 10µH inductor between this pin and input
voltage source.
Ground.
Feedback pin from LED ballast resistor. Connect a resistor to ground to set the maximum
LED current.
Enable on/off control and S2Cwire interface input.
Output of boost converter. Connect to the anode of the first LED in the series string.
Input voltage to IC. Tied to input voltage source and input boost inductor.
Pin Configuration
TSOT23-6
(Top View)
2
LX
1
6
VIN
GND
2
5
OUT
FB
3
4
EN/SET
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Absolute Maximum Ratings1
Symbol
Description
VLX, VOUT
VIN, VEN/SET
VFB
TJ
TLEAD
LX or OUT voltage to GND
VIN, EN/SET to GND Voltage
FB to GND Voltage
Junction Operating Temperature
Soldering Temperature (at leads, 10 sec.)
Value
28
-0.3 to 6
-0.3 to VIN
-40 to 140
300
Units
V
°C
Thermal Information2
Symbol
ΘJA
PD
Description
Thermal Resistance
Maximum Power Dissipation
Value
Units
139
0.719
°C/W
W
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.
2. Mounted on an FR4 board.
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3
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Electrical Characteristics1
VIN = 3.6V, CIN = 2.2µF, COUT = 2.2µF, L = 10µH, RFB = 12.5Ω (IOUT = 20mA), TA = -40°C to 85°C unless otherwise noted.
Typical values are at TA= 25°C.
Symbol
Description
Conditions
Power Supply
VIN
Input Voltage Range
VUVLO
Under Voltage Lockout Threshold
VFB
Feedback Voltage
IQ
Quiescent Supply Current
IIN
Supply Current
ISHDN
Input Shutdown Current
VOVP
Over-Voltage Protection Threshold
RDS(ON)
On-Resistance
DMAX
Maximum Duty Cycle
fosc
Oscillator Frequency
S2C Control: EN/SET
VEN/SET(L)
EN/SET Input Low Threshold
VEN/SET(H)
EN/SET Input High Threshold
IEN/SET
EN/SET Input Leakage Current
tEN/SET(LOW)
EN/SET Input Low Time
tEN/SET(HI_MIN)
EN/SET Minimum High Time
tEN/SET(HI_MAX) EN/SET Maximum High Time
tEN/SET(OFF)
EN/SET Input Off Timeout
tEN/SET(LAT)
EN/SET Latch Timeout
Thermal Protection
TJ(SD)
Thermal Shutdown Threshold
TJ(HYS)
Thermal Shutdown Hysteresis
VIN Rising
Hysteresis
ILED = 20mA
No Switching, VEN/SET = 5V
VEN/SET = 5V
VEN/SET = 0V
Min
Typ
Max
Units
5.5
2.5
V
2.7
2.2
237
23
300
250
170
2.3
25
650
263
600
4.0
27
1000
90
TA = 25°C
1.0
0.4
VEN/SET = 5V, VIN = 5V
1.4
-1
0.3
100
1
75
75
500
500
140
15
mV
mV
µA
mA
µA
V
mΩ
%
MHz
V
V
µA
µs
ns
µs
µs
µs
°C
°C
1. The AHK1421 is guaranteed to meet performance specification over the –40°C to +85°C operating temperature range, and is assured by design, characterization and correlation with statistical process controls.
4
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Shutdown Current vs Input Voltage
Quiescent Current vs Input Voltage
220
4.0
85°C
3.2
200
25°C
180
IQ (μA)
ISD (μA)
-40°C
2.4
160
1.6
140
0.8
85°C
120
0.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
100
5.5
Input Voltage (V)
25°C
-40°C
2.7
4.3
4.7
5.1
5.5
Switching Frequency vs Temperature
(RFB = 8.3Ω, L = 10µH, 6LEDs)
VIN = 3.6V, RFB = 12.4Ω, 6LEDs
1.10
Frequency (MHz)
Efficiency (%)
3.9
Input Voltage (V)
90%
80%
70%
VIN = 2.7V
VIN = 3.0V
60%
VIN = 3.6V
VIN = 4.2V
50%
40%
3.5
Efficiency vs Output Current
100%
3.1
VIN = 5.0V
VIN = 5.5V
0
4
8
12
16
20
24
28
1.02
0.98
0.94
0.90
-40
32
Output Current (mA)
1.06
-15
10
35
60
85
Temperature (°C)
NMOS RDS(ON)N vs Input Voltage
1000
-40°C
RDS(ON) (mΩ)
900
25°C
85°C
800
700
600
500
400
2.7
3.1
3.5
3.9
4.3
Input Voltage (V)
4.7
5.1
5.5
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Sink Current Accuracy vs Temperature
Sink Current Accuracy vs Temperature
31.0
20.5
30.8
20.3
Current (mA)
Current (mA)
VIN = 3.6V, RFB = 8.3Ω, 6 LEDs
30.6
30.4
30.2
30.0
VIN = 3.6V, RFB = 12.4Ω, 6 LEDs
20.1
19.9
19.7
-40
-15
10
35
60
19.5
-40
85
Temperature (°C)
10
35
60
85
Temperature (°C)
Feedback Voltage vs Temperature
Feedback Voltage vs Input Voltage
VIN = 3.6V, RFB = 12.4Ω, 6 LEDs
0.260
-15
0.260
0.256
0.252
0.252
VFB (V)
VFB (V)
0.256
0.248
0.248
0.244
0.244
0.240
-40
-15
10
35
60
0.240
2.7
85
Temperature (°C)
3.1
3.5
4.3
4.7
5.1
OVP Low Threshold Voltage vs Input Voltage
24.5
26.0
85°C
85°C
24.1
25°C
25.6
25°C
-40°C
VOVPH (V)
VOVPL (V)
25.2
24.8
23.3
22.5
5.5
24.0
3.1
3.5
3.9
4.3
Input Voltage (V)
6
-40°C
23.7
22.9
24.4
2.7
5.5
Input Voltage (V)
OVP High Threshold Voltage vs Input Voltage
3.9
4.7
5.1
5.5
5.1
4.7
4.3
3.9
3.5
Input Voltage (V)
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3.1
2.7
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
EN Input High/Low Threshold Voltage vs
Input Voltage
1.0
VENH
VLX
20V/div
VENL
0.9
VENH & VENL(V)
Operation Waveform
(VIN = 3.6V, CIN = 4.7μF, COUT = 2.2μF, RFB = 8 .3Ω, 6 LEDs)
0
0.8
IINDUCTOR
500mA/div
0.7
0
VOUT (AC)
0
50mV/div
0.6
0.5
0
ILED
20mA/div
0.4
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Time (800ns/div)
Start Up Waveform
Turn Off
(V = 3.6V, C = 2.2μF, C = 2.2μF, R = 8.3Ω, 6 LEDs)
(VIN = 3.6V, CIN = 2.2μF, COUT = 2.2μF, RFB = 8.3Ω, 6 LEDs)
IN
EN
2V/div
EN
2V/div
0
VOUT
20V/div
VOUT
20V/div
0
IIN
200mA/div
IIN
200mA/div
0
ILED
20mA/div
ILED
20mA/div
0
Time (1ms/div)
ILED
20mA/div
0
0
0
Time (200μs/div)
LED Current Transient
0
EN/SET
5V/div
0
VOUT
20V/div
0
IIN
200mA/div0
VOUT
20V/div
IIN
200mA/div
FB
(VIN = 3.6V, CIN = 2.2μF, COUT = 2.2μF, RFB = 8.3Ω, S2C data 16 to 1,
15mA to 31mA, 6LEDs)
(VIN = 3.6V, CIN = 2.2μF, COUT = 2.2μF, RFB = 8.3Ω, S2C data 1 to 16,
31mA to 15mA, 6 LEDs)
EN/SET
5V/div
OUT
0
LED Current Transient
IN
0
0
0
ILED
0
20mA/div
Time (200μs/div)
Time (200μs/div)
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7
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Functional Block Diagram
LX
VIN
EN/SET
Logic /
Boost Control
Osc.
OUT
OVP
FB
GND
Functional Description
Soft Start / Enable
The AHK1421 is a highly integrated, high efficiency
white LED backlight solution for mobile phones and all
battery operated equipment. The device operates from
regulated DC inputs, and single-cell Li-ion batteries in
the voltage range 2.7V to 4.2V.
The AHK1421 is enabled by EN/SET pulled to high after
power on with a certain delay time. Internal soft start
circuitry limits the input inrush current and eliminates
output voltage overshoot. When EN/SET is pulled low,
the AHK1421 enters a low-power, non-switching state.
The total input current during shutdown is less than 4μA.
The integrated boost (step-up) converter provides up to
28V output to drive up to 6 series LEDs. The LED current
is set by a single external resistor up to 31mA. S2C single wire interface can enable and disable the IC and
adjust the dimming in 32 steps.
The AHK1421 is available in a Pb-free 6-pin TSOT23
package.
The over-voltage protection function is designed to protect the boost converter during the fault of the open
circuit of the LED string. The over-temperature function
is targeted to protect the converter if an over-temperature fault occurs.
8
Over-Temperature Protection
Thermal protection disables the AHK1421 when internal
dissipation becomes excessive. Thermal protection disables the power MOSFET. The junction over-temperature
threshold is 140°C with 15°C of temperature hysteresis.
The output voltage automatically recovers when the
over-temperature fault condition is removed.
Over-Voltage Protection
Over-voltage protection prevents damage to the
AHK1421's pin during LED open-circuit or high output
voltage conditions. An over-voltage event is defined as a
condition where the voltage on the OUT pin exceeds the
over-voltage protection threshold (VOVP). When VOVP has
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
S2Cwire™ Serial Interface
reached the threshold limit, the converter stops switching
and the output voltage decays. Switching resumes when
the lower hysteresis limit of VOVP is reached, thereby
maintaining an average output voltage between the
upper and lower OVP thresholds.
The LED current magnitude can be controlled by the EN/
SET pin using the S2Cwire interface. The interface
records rising edges of the EN/SET pin and decodes them
into 32 individual current level settings. Code 1 is full
scale (maximum LED current), and Code 32 is 2% of the
full scale. The modulo 32 interface wraps states back to
state 1 after the 32nd clock. The counter can be clocked
at speeds up to 1MHz, so intermediate states are not visible. The first rising edge of EN/SET enables the IC and
initially sets the output LED current to full scale after
500µs tLAT. Once the final clock cycle is input for the
desired brightness level, the EN/SET pin should be held
high to maintain the device output current at the programmed level. The device is disabled 500μs after the
EN/SET pin enters a logic low state. The EN/SET timing
is designed to accommodate a wide range of data rates
from 20kHz to 1MHz.
LED Current Setting
The maximum LED current is determined by the RFB
resistor value. With a fixed 0.25V voltage on RFB, the LED
maximum current is a linear ratio to the current flowing
through RFB.
ILED =
VFB
RFB
Where VFB = 0.25V
Table 1 lists examples of calculated RFB resistor values for
different maximum LED current requirements. Higher
accuracy RFB resistor can get higher accurate LED current.
Maximum LED Current
(mA)
RFB (Ω)
31
30
20
15
12
10
8.06
8.33
12.5
16.66
20.83
25
After the first rising edge of EN/SET, the boost converter
is enabled and reaches full capacity after the soft-start
time. Exact counts of clock pulses for the desired current
level should be entered on the EN/SET pin with a single
burst of clocks. The counter refreshes each time a new
clock input to the EN/SET pin is detected. A constant current is maintained as long as EN/SET remains in a logic
high state. To save power, the boost converter is switched
off after EN/SET has remained in the low state for at
least the tOFF timeout period as shown in Figure 1.
Table 1: Examples of RFB Values for Setting
Maximum LED Current Levels.
The LED dimming is controlled in 32-steps using the
S2Cwire single-wire interface via the EN/SET pin. 32
S2Cwire rising-edge steps set the LED current from 100%
to 2% of the maximum LED current.
S2Cwire Serial Interface Timing
THI
TLO
TOFF
T LAT
EN/SET
1
Data Reg
2
n-1
n ≤ 32
0
n
0
Figure 1: S2Cwire Timing Diagram.
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9
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Application Information
LED Current Setting
LED current dimming is controlled via the S2Cwire singlewire interface through the EN/SET pin in 32 steps. The
S2Cwire interface programs the LED current from the
maximum LED current set by RFB to 2% of the maximum
LED current as shown in Table 2.
S2Cwire
Data
LED Current
(% IMAX)
S2Cwire
Data
LED Current
(% IMAX)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
100
97
94
90
87
84
81
77
74
71
68
65
61
58
55
52
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
48
45
42
39
35
32
29
26
23
19
16
13
10
6
3
2
verter LED driver application. MLC capacitors of type X7R
or X5R are recommended to ensure good capacitance
stability over the full operating temperature range. Table
3 lists some recommended capacitors for use with the
AHK1421.
Inductor Selection
Inductor value, saturation current and DCR is most important parameter in selecting an inductor for AHK1421. The
suitable inductance range for the AHK1421 is 4.7μH to
22μH. Higher inductance lowers the step-up converter's
RMS current value. Together with lower DCR value of the
inductor, it makes the total inductor power loss become
much lower. Considering inductor size and cost, 10μH
inductance is most suitable.
Inductor saturation current is a key parameter in selecting
an inductor. For the step-up converter, the peak inductor
current is the DC input current plus half the inductor
peak-to-peak current ripple.
DC input current is given by:
IIN =
VOUT · ILED
VIN · η
Inductor peak-to-peak current ripple:
IL_PP =
Table 2: S2Cwire Dimming Control
Current Settings.
VIN · (VOUT - VIN)
VOUT · L · f
Inductor peak current:
Capacitor Selection
A 2.2μF/10V input capacitor is recommended and a
2.2μF/50V output capacitor is suitable as noted above.
Multi-layer ceramic (MLC) capacitors provide small size
and adequate capacitance, low parasitic equivalent
series resistance (ESR) and equivalent series inductance
(ESL), and are well suited for use as input, output and
compensation capacitors in the AHK1421 step-up con-
IL_PEAK = IIN +
IL_PP VOUT · ILED VIN · (VOUT - VIN)
=
+
2
VIN · η
2 · VOUT · L · f
For example, for a white LED with 3.2V VF and 20mA
current at 82% efficiency, the inductor peak current for
6LEDs in a string is:
IL_PEAK =
3.2 · 6 · 0.02
3.6 · (3.2 · 6 - 3.6)
+
= 276mA
3.6 · 0.82
2 · 3.2 · 6 · 10µ · 1M
Manufacturer
Part Number
Value (μF)
Voltage
(V)
Temperature
Range
Case Size
Murata
GRM188R61A225K
GRM31CR71H225K
2.2
2.2
10
50
X5R
X7R
0603
1206
Table 3: Examples of AHK1421 Input and Output Capacitor Selection.
10
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
For the inductor copper loss, the inductor DCR value
together with the RMS current value flowing through the
inductor leads to inductor conduction loss and also
affects total efficiency. Larger DCR leads to larger conduction loss and decreases total efficiency. The inductor
conduction loss can be estimated as shown in the equation:
PL_LOSS = I2L_RMS · DCR
=
1
· (I2L_MAX + I2L_MIN + IL_MAX · IL_MIN) · DCR
3
Schottky Diode Selection
To achieve maximum efficiency, a low VF Schottky diode
is recommended. The diode voltage rating should be
higher than the OVP voltage. For an AHK1421 driving 6
white LEDs with up to 4V forward voltage, the diode
voltage rating should be higher than 24V. Select a diode
with DC rated current equal to the input current to allow
an adequate margin for safe use. Table 5 gives some
examples of recommended Schottky diodes for use with
the AHK1421.
IL_MAX and IL_MIN are the inductor peak current and minimum current.
Table 4 gives some examples of recommended inductors
for use with the AHK1421.
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Manufacturer
Part Number
Inductance
(μH)
Sumida
CDRH2D14-100
LQH3NPN100NM0
LQH3NPN100NG0
EPL2014-103MLC
10
10
10
10
Murata
Coilcraft
Maximum
DC ISAT
Current
(mA)
DCR (mΩ,
typ)
Size (mm)
LxWxH
Type
700
870
630
600
294
260
570
440
3.2x3.2x1.55
3.0x3.0x1.4
3.0x3.0x0.9
2.1x2.2x1.0
Shielded
Non-shielded
Non-shielded
Shielded
Table 4: Example of AHK1421 Inductor Selection
Manufacturer
TSC
Diodes
Central
Part
Number
Maximum
DC
Blocking
Voltage
VR
(V)
Maximum
DC
Forward
Current
IF
(mA)
Nonrepetitive
Peak Forward
Surge Current
IFSM (A)
Forward
Voltage
VF (V)
Case
"Size WxLxH
(mm)"
SS13L
SS14L
SDM20U40
SD103BW
CMDSH2-3
30
40
40
30
30
1100
1100
250
350
200
30
30
1
1.5
1
0.51@0.5A
0.51@0.5A
0.37@20mA
0.37@20mA
0.32@15mA
Sub SMA
Sub SMA
SOD523
SOD123
SDD323
1.9x3.8x1.43
1.9x3.8x1.43
0.9x1.7x0.65
1.7x3.85x1.35
1.35x2.6x1.0
Table 5: Example of AHK1421 Schottky Diode Selection
12
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DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Printed Circuit Board
Layout Recommendations
2. Make sure the ground bump connected to the printed circuit board with large copper area for better
thermal dissipation.
3. Put the input and output capacitor close to the IC as
close as possible to get the best filter result.
For best performance of the AHK1421, the following
guidelines should be followed when designing the PCB
layout:
1. Make the power trace as short and wide as possible,
including the input/output power lines and switching
node, etc.
Schematic and Layout
LX
L1
10µH
VOUT
U1
AHK1421ICA
J1
DC+
2.7~5.5V
6
CIN
VIN
LX
2.2µF
DC-
OUT
4
AHK1421ICA
White LED
Driver
EN/SET
FB
GND
2
J2
DS1
1
COUT
2.2µF
5
D1
3
D3
D2
D4
D5
D6
R4
50k
V_MCU
RFB
12.5
EN/SET
S2Cwire/PWM
Microcontroller
R7 R8 R9
1k 1k 1k
UP
DOWN
1
2
3
4
U2
PIC12F675
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
8
6
7
5
C1
R5
0.1µF 1k
R6
330
LED1
Red
LED2
Green
CYCLE
Figure 2: AHK1421ICA Evaluation Board Schematic.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202265A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012
13
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
(a) Top Layer
(b) Bottom Layer
Figure 3: AHK1421ICA Evaluation Board
Component
Part Number
U1
AHK1421
U2
PIC12F675
C1
CIN, COUT
S1-S3
D1, D2, D3, D4, D5, D6
DS1
GRM188R71H104KA01
GRM31CR71H225K
PTS645TL50
RS-0805UW
SS14L
L1
CDRH3D18-100NC
LED1
LED2
R4
R5,R7, R8, R9
R6
RFB
CMD15-21SRC/TR8
CMD15-21UGC/TR8
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
Description
S2C controlled, serial LED
boost driver IC, TSOT23-6
8-bit CMOS, FLASH-based uC;
SOIC-8
0.1µF, 50V, X7R, 0603
2.2μF, 50V, X7R, 1206
Switch Tact, SPST, 5mm
30mA White LED 0805
Schottky Diode
Power Inductor 10μH 0.9A
SMD
Red LED; 1206
Green LED; 1206
50kΩ, 1%, 1/4W; 0603
1kΩ, 1%, 1/4W; 0603
330Ω, 1%, 1/4W; 0603
12.5Ω, 1%, 1/4W; 0603
Manufacturer
Skyworks
Microchip
Murata
Murata
ITT Industries
Realstar
TSC
Sumida
Chicago Miniature Lamp
Chicago Miniature Lamp
Vishay
Vishay
Vishay
Vishay
Table 6: AHK1421ICA Evaluation Board BOM List
14
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202265A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TSOT23-6
T7XYY
AHK1421ICA-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
TSOT23-6
0.40 ± 0.10
0.95 BSC
0.127 BSC
1.60 BSC
2.80 BSC
Detail "A"
End View
Top View
1.00 ± 0.10
0.25 BSC
2.90 BSC
1.00
+10°
-0°
0.45 ± 0.15
0.000
+ 0.100
- 0.000
Side View
Detail "A"
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202265A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012
15
DATA SHEET
AHK1421
S2C Controlled, Serial LED Boost Driver
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
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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
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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
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16
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202265A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 10, 2012
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