Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
SKYA21004: Three-Channel LCD Bias Power Management IC
with Three-Channel High-Efficiency White LED Driver
Applications
Description
 Automotive displays
The SKYA21004 consists of a power management block
supplying LCD bias rails and a three-channel backlight driver.
 Digital photo frames
 Digital still cameras
 Tablets
 Notebooks
Features
LCD bias power (AVDD boost)
 Input supply range: 2.8 V to 5.5 V
 1.3 MHz fixed frequency boost regulator
 Adjustable voltage up to 14.5 V (±1% typical accuracy)
 Short-circuit, over-voltage, and over-temperature protection
Positive/negative gate drive (VGH/VGL)
 Up to 13.2 V input supply (VDD)
 Adjustable voltage up to 30 V @ 20 mA (VGH)
 Adjustable voltage down to 30 V @ 20 mA (VGL)
LED driver
 Input supply range: 2.8 V to 5.5 V
 Adjustable operating frequency: 600 kHz to 2 MHz
 Dimming control options:
 8-bit resolution on LED current control – I2C interface
 Direct PWM dimming (10-bit resolution of PWM duty control)
 Analog PWM dimming (9-bit resolution of PWM duty control)
 Programmable maximum LED current (30 mA to 120 mA)
per channel
 Up to 28 V, 120 mA per channel
 Accuracy matching: ±2.5% @ 60 mA
 Fade in/out feature for current control
 PWM input range: 100 Hz to 25 kHz
 LED open/short detection, boost over-voltage/current protection,
over-temperature protection
 AEC-Q100 qualified
 QFN (36-pin, 7 mm  4 mm, 0.5 mm pitch) package
(MSL3, 260 ºC per JEDEC J-STD-020)
The LCD bias power management block of the SKYA21004
includes a boost converter that supplies main analog voltage
(AVDD) of the panel, two charge-pump controllers supplying a
gate-on voltage (VGH), and a gate-off voltage (VGL) to the LCD
panel. The boost converter uses a 1.3-MHz fixed frequency to
generate AVDD voltage up to 14.5 V. Two charge-pump
controllers can generate up to +30 V and down to 30 V from the
charge-pump stages configured by diodes and capacitors. A
proprietary regulation algorithm can minimize the output ripple.
The backlight driver of the SKYA21004 integrates the boost
converter to drive the LED voltage up to 28 V. The switching
frequency is adjustable from 600 kHz to 2 MHz for system
integration flexibility, which optimizes the efficiency and controls
EMI. Three precision current sinks are programmable to drive LED
current up to 120 mA per string.
The backlight driver of the SKYA21004 supports Analog Pulse
Width Modulation (APWM) dimming, Direct Pulse Width
Modulation (DPWM) dimming, and analog dimming (through I2C).
In the DPWM dimming mode, the output waveform follows the
duty and the frequency of control input signal from the PWM pin.
In the APWM dimming mode, the LED current of each channel is
controlled by the input duty of PWM input signal, the I2C
programmed brightness level, and the external RISET resistor.
The PWM pin can accept the frequency range from 100 Hz to
25 kHz with 10-bit resolution of duty control and 8-bit resolution
of current control. When the PWM pin is not used, it needs to be
pulled high.
The SKYA21004 is available in a 7 mm  4 mm, 36-pin QFN
package.
A typical application circuit is shown in Figure 1. The pin
configurations are shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
Skyworks GreenTM products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of GreenTM, document number
SQ04–0074.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202949E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2015
1
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
OUT
470 nF
0.1 μF
VIN
LCD Supply Input
0.22 μF
10 μF
8 nF
100 pF
19
COMP
20
FB
21
AGND
VL
IN
22
FB
24 SCL
23
SCL
DGND
25
26
OUT
OVP
27 OVP
BL_EN
28
WEN
18
17
DRVN
FB
11 kΩ
14
5V
13 VDD
0.1 μF
1 μF
0.22 μF
0.1 μF
BL Supply Input
0.1 μF
0.22 μF
0.22 μF
NC
OUT (up to 28 V)
2.2 μF
2.2 μF
301 kΩ
FBP
10 kΩ
37.4 kΩ
0.22 μF
OVP
NC
6.04 kΩ
D1
1 MΩ
VGH
0.1 μF
4.7 μH
4.7 μF
226 kΩ
NC
15 EN_LCD
VDD
12
FBN
GND
11
10
REF
GND
9
8
WLX
WPGND
WLX
7
6
5
WPGND
NC
2.2 μF 2.2 μF 2.2 μF 2.2 μF
16 FBP
DRVP
4
36
LX
PGND
EN
CS56
1
X
SKYA21004
CS34
PWM
LED3 35
4.7 μH
FBP
PWM 3
LED2 34
AVDD
200 kΩ
CS12
GND
22 kΩ
FOSC
2
LED1 33
WCOMP
ISET
32
SDA
31
SGND
34.8 kΩ
29
30 SDA
10 kΩ
0.22 μF
2.2 μF
VGL
45.3 kΩ
AVDD
VDD
t0454
Figure 1. SKYA21004 Typical Application Circuit
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SDA
WCOMP
WEN
OVP
OUT
DGND
SCL
VL
IN
AGND
FB
COMP
30
29
28
27
26
25
24
23
22
21
20
19
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
ISET
31
18
LX
FOSC
32
17
PGND
CS12
33
16
FBP
CS34
34
15
EN
CS56
35
14
DRVP
NC
36
13
VDD
1
2
3
4
5
6
7
8
9
10
11
12
SGND
GND
PWM
WPGND
WPGND
WLX
WLX
GND
REF
FBN
GND
DRVN
EP
t0095
Figure 2. SKYA21004 Pinout – 7 mm  4 mm, 36-Pin QFN
(Top View)
Table 1. SKYA21004 Signal Descriptions
Pin
Name
Description
Pin
Name
Description
1
SGND
Ground connection for current sinks.
19
COMP
LCD bias boost external compensation.
2
GND
Ground.
20
FB
LCD bias boost feedback input.
3
PWM
External PWM dimming signal input. When this is not
used, it should be pulled high.
21
AGND
Analog ground.
4
WPGND
LED driver boost converter power ground.
22
IN
IC supply input.
5
WPGND
LED driver boost converter power ground.
23
VL
LED driver internal regulator bypass output. Bypass with
16 V, X7R 470 nF capacitor to the ground.
6
WLX
LED driver boost converter switch node.
24
SCL
I2C serial interface clock input.
7
WLX
LED driver boost converter switch node.
25
DGND
LED driver digital ground. Connect to the analog ground.
8
GND
Ground.
26
OUT
LED driver boost output sense pin.
9
REF
Internal reference bypass pin. Bypass with 0.1 F ceramic
capacitor to the AGND.
27
OVP
LED driver OVP set pin. Connect to the LED driver boost
output using high-impedance resistor voltage divider.
10
FBN
Negative charge-pump feedback input.
28
WEN
LED driver enable pin.
11
GND
Ground.
29
WCOMP
LED driver boost external compensation pin.
12
DRVN
Negative charge-pump driver output.
30
SDA
I2C serial interface data.
13
VDD
Charge-pump driver supply voltage. Bypass with 1 F
ceramic capacitor to the AGND.
31
ISET
LED channel current set-up pin. Connect a set resistor
between this pin and analog ground to program the max LED
current.
14
DRVP
Positive charge-pump driver output.
32
FOSC
LED driver boost switching frequency setting pin. Connect an
external resistor to set the frequency from 600 kHz to 2 MHz.
15
EN
LCD bias power block enable pin.
33
CS12
LED current sink 12. Connect to AGND to disable the channel.
16
FBP
Positive charge-pump feedback input.
34
CS34
LED current sink 34. Connect to AGND to disable the channel.
17
PGND
LCD bias boost converter power ground.
35
CS56
LED current sink 56. Connect to AGND to disable the channel.
18
LX
LCD bias boost converter switch node.
36
NC
No connect.
EP
Exposed paddle.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Electrical and Mechanical Specifications
Safe operating area characteristics are shown in Figures 3
through 6. Typical performance characteristics of the SKYA21004
are illustrated in Figures 7 through 47.
The absolute maximum ratings of the SKYA21004 are provided in
Table 2. The recommended operating conditions are listed in
Table 3. The electrical specifications are provided in Table 4.
Table 2. SKYA21004 Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
Typical
Maximum
Units
IN and VL to SGND, AGND, DGND, (W)PGND
VIN, VVL
0.3
+6.5
V
LX, CS12, CS34, CS56, WLX and OUT to SGND, AGND,
(W)PGND, DGND
VLX, VCS12, VCS34, VCS56, VWLX, VOUT
0.3
+30.0
V
WEN, ISET, WCOMP, OVP, FOSC, SDA, SCL, and PWM to
SGND, AGND, (W)PGND, DGND
VWEN, VISET, VWCOMP, VOVP, VFOSC, VSDA,
VSCL, VPWM
0.3
VIN + 0.3
V
VDD
VDD
0.3
+14
V
COMP, FB, FBP, FBN, and REF to AGND, PGND
VCOMP, VFB, VFBP, VFBN, VREF
0.3
VIN + 0.3
V
DRVP, DRVN
VDRV
0.3
VDD + 0.3
V
Maximum junction operating temperature
TJ
40
+150
ºC
Maximum power dissipation (Notes 2 and 3)
PD
1.257
W
Thermal resistance (Note 2)
JA
16.5
ºC/W
Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Note 2: The thermal resistance is measured in accordance with EIA/JESD 51 series.
Note 3: When TA = 25 ºC.
CAUTION: Although this device is designed to be as robust as possible, electrostatic discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Table 3. SKYA21004 Recommended Operating Conditions
Parameter
Symbol
Minimum
Maximum
Input voltage range
VIN
2.8
5.5
V
Charge-pump drivers supply voltage
VDD
2.8
13.2
V
Input PWM frequency
fPWM
0.1
25.0
kHz
Storage temperature
TS
40
+150
ºC
Operating ambient temperature
TA
40
+105
ºC
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Units
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Table 4. SKYA21004 Electrical Specifications (1 of 2) (Notes 1 and 2)
(VIN = 5 V, VDD = 12 V, AVDD = 13.2 V, L1 = 4.7 H, L2 = 4.7 H, CIN = 10 F, CwIN = 4.7 F, CWOUT = 3  2.2 F, COUT = 4  2.2 F,
TA = –40 C to +105 C, Typical Values are TA = +25 C, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
General
Input voltage
VIN
Quiescent supply current
IQ
VEN = VWEN = high, VIN = 3.6 V
2.8
Input shutdown current
ISHDN
VEN = VWEN = 0 V, VIN = 3.6 V
Reference voltage
VREF
No load, VIN = 3.6 V
Over-temperature shutdown threshold
TSD
Maximum input logic low
VIL
Minimum input logic high
VIH
5.5
4.7
2
1.18
V
mA
1.2
1.22
140
A
V
ºC
0.4
1.4
V
V
LCD Bias Boost Section (AVDD)
Output voltage
VAVDD
Operating frequency
fOSC
910
1300
Maximum duty cycle
DMAX
86
90
No load
0.588
0.6
0.612
VFB falling
0.528
0.548
0.568
FB regulation voltage
VIN + 1
14.5
V
1690
kHz
%
V
VFB
FB fault trip level
FB load regulation
VAVDD/IAVDD
0 < IAVDD < full load
FB input bias current
IFB
VFB = 0.7 V
0.01
V
%/mA
1
+1
A
LX on resistance
RLX(ON)
ILX = 200 mA
350
700
m
LX leakage current
ILX_LEAK
VLX = 13.2 V
0.01
20
A
LX current limit
ILIM
Soft-start time
tss
1
No load
A
1.3
ms
Gate On Charge-Pump Driver (VGH)
VDD input voltage range
VDD
FBP regulation voltage
VFBP
FBP fault trip level
VFBP
DRVP P-Ch on resistance
DRVPPRDS
DRVP N-Ch on resistance
DRVPNRDS
2.8
VFBP rising
13.2
V
0.588
0.6
0.612
V
0.457
0.487
0.517
V
3
6

1.5
3

13.2
V
mV
VFBP = 0.585 V
Gate Off Charge-Pump Driver (VGL)
VDD input voltage
VDD
2.8
FBN regulation
VFBN
50
0
50
0.403
0.43
0.457
V
3
6

1.5
3

1.00
1.09
FBN fault trip level
VFBN
DRVN P-Ch on resistance
DRVNPRDS
VFBN rising
DRVN N-Ch on resistance
DRVNNRDS
VFBN = 0.035 V
Over-voltage threshold
VOVP
VIN = 3.6 V
Over-voltage hysteresis
VOVP_HYS
VIN = 3.6 V
Soft-start time
tSS
Oscillator frequency
fOSC
VIN = 3.6 V
Switch on resistance
RDSON
VIN = 3.6 V
LED Driver Boost Converter
0.91
V
100
mV
2.5
ms
600
2000
150
kHz
m
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Table 4. SKYA21004 Electrical Specifications (2 of 2) (Notes 1 and 2)
(VIN = 5 V, VDD = 12 V, AVDD = 13.2 V, L1 = 4.7 H, L2 = 4.7 H, CIN = 10 F, CwIN = 4.7 F, CWOUT = 3  2.2 F, COUT = 4  2.2 F,
TA = –40 C to +105 C, Typical Values are TA = +25 C, Unless Otherwise Noted)
Parameter
Switch current limit
Symbol
Test Condition
Min
Typical
Max
Units
ILIM = 0, VIN = 3.6 V
2.6
3.7
A
ILIM = 1, VIN = 3.6 V
2.1
3.1
A
ILIM
Switch off time
tOFF
FOSC voltage
VFOSC
VIN = 3.6 V
55
0.6
ns
V
VISET
VIN = 3.6 V
0.6
V
LED Driver Current Sink
ISET voltage
1
A
30
120
mA
ICS = 60 mA, VIN = 3.6 V
2.5
2.5
%
ICSX_MATCHING
ICS = 60 mA, VIN = 3.6 V
2.5
2.5
%
VCSX
ICS = 60 mA
0.5
V
VCSX(SHORT)
VSHRT = 00
7
V
Current sink leakage
ICS_LEAK
VCSx = 28 V, WEN = logic low, VIN = 3.6 V
Maximum channel current
ILED_MAX
RISET program
Current sink accuracy
ICSX
Current sink matching
Current sink voltage
Shorted LED detection threshold
Open LED detection threshold
VCSX(OPEN)
PWM input frequency range
fPWM
VIN = 3.6 V
100
PWM duty hysteresis
DPWM_HYS
Duty direction change
0.5
%
Current sink brightness changing time
tSLEW
From one dimming level to another level
4
ms/step
Current sink brightness changing time at
startup or dimming mode change
tSLEW_START
From one dimming level to another level
30
s/step
DPWM propagation delay
tPWM_PROP
1
cycle
PWM leakage current
IPWM_LEAK
0.1
mV
25
VPWM = 3.3 V, VIN = 3.6 V
kHz
15
A
0.4
V
2
I C Interface
Input logic low
VIL
VIN = 3.6 V
Input logic high
VIH
VIN = 3.6 V
SDA output low voltage
VOL
IPULL_UP = 3 mA, VIN = 3.6 V
SDA, SCL input leakage current
IIN
VSDA = VSCL = 5 V, VIN = 3.6 V
SCL clock frequency
fSCL
1.4
1
0.4
V
+1
A
400
kHz
SCL low clock period
tLOW
VIN = 3.6 V
1.3
s
SCL high clock period
tHIGH
VIN = 3.6 V
0.6
s
Hold time start condition
tHD_STA
VIN = 3.6 V
0.6
s
SDA data setup time
tSU_DAT
VIN = 3.6 V
100
ns
Setup time for start (repeated) condition
tSU_STA
VIN = 3.6 V
0.6
s
SDA data hold time
tHD_DAT
VIN = 3.6 V
0
Setup time for stop condition
tSU_STO
VIN = 3.6 V
0.6
s
Bus free time between stop and start conditions
tBUF
VIN = 3.6 V
1.3
s
Capacitive load for each bus line
CB
Note 1: Performance is guaranteed only under the conditions listed in this table.
Note 2: Min and Max limits are specified by design, test, or statistical analysis.
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V
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0.9
400
s
pF
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
400
350
350
300
250
200
150
5V
3.6 V
2.8 V
100
50
0
–40
–20
0
20
40
60
80
100
300
250
200
150
5V
3.6 V
2.8 V
100
50
0
–40
120
–20
0
Temperature ( °C)
300
700
LCD : IOUT (mA)
800
250
200
150
50
20
40
60
80
100
120
80
100
120
Temperature ( °C)
Figure 5. WLED: Maximum LED Current vs Temperature
(8S3P)
5V
3.6 V
2.8 V
600
500
400
300
200
100
0
–40
Y1218
5V
3.6 V
2.8 V
100
Y1217
WLED : ILED (mA)
900
350
0
60
Figure 4. WLED: Maximum LED Current vs Temperature
(7S3P)
400
–20
40
Temperature ( °C)
Figure 3. WLED: Maximum LED Current vs Temperature
(6S3P)
0
–40
20
Y1216
WLED : ILED (mA)
400
Y1215
WLED : ILED (mA)
Safe Operating Area Characteristics
–20
0
20
40
60
80
100
120
Temperature ( °C)
Figure 6. LCD: Maximum Load Current vs Temperature
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Typical Performance Characteristics
(VIN = 5 V, VDD = 12 V, AVDD = 13.2 V, L1 = 4.7 H, L2 = 4.7 H, CIN = 10 F, CWIN = 4.7 F, CWOUT = 3  2.2 F,
COUT = 4  2.2 F, TA = –40 C to +105 C, Typical Values are TA = +25 C, Unless Otherwise Noted)
4.74
25
4.70
4.68
4.66
4.64
4.62
Y1255
4.60
4.58
–40
–20
0
20
40
60
80
100
20
15
10
5
Y1256
Shutdown current (nA)
Quiescent Current (mA)
4.72
0
120
-40
Temperature (ºC)
-20
0
20
40
60
80
100
120
Temperature (ᵒC)
Figure 7. Quiescent Current vs Temperature
Figure 8. Shut Down Current vs Temperature
3.0
ILIM = 1
1.0
Y1257
0.5
0
–40
–20
0
20
40
60
Temperature ( ℃)
80
100
0.840
0.835
0.830
0.825
-40
120
0
20
40
60
60.6
0.5
60.5
60.4
CS12
60.3
CS34
60.2
CS56
Y1259
60.1
WLED: Current Sink Matching (%)
0.6
100
0
20
40
60
120
0.4
0.3
0.2
0.1
0
-20
80
100
120
Temperature (ᵒC)
Figure 11. WLED: Current Sink Accuracy vs Temperature
-40
-20
0
20
40
60
80
100
Temperature (ᵒC)
Figure 12. WLED: Current Sink Matching vs Temperature
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8
80
Figure 10. WLED: Switching Frequency vs Temperature
(VIN = 5 V, RFOSC = 24.3 kΩ)
60.7
60.0
-40
-20
Temperature (ᵒC)
Figure 9. WLED: ILIM vs Temperature
WLED: Current Sink Accuracy (mA)
0.845
Y1258
ILIM = 0
1.5
0.850
Y1260
WLED : I LIM (A)
2.0
WLED: Switching Frequency (MHz)
0.855
2.5
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120
1200
1100
1100
1000
900
Vin = 5.5V
800
Vin = 5V
700
Vin = 3.6V
600
Vin = 3V
500
1000
900
Vin = 5.5V
800
Vin = 5V
700
Vin = 3.6V
600
Vin = 3V
500
Y1262
WLED: EN Low Threshold (mV)
1200
Y1261
WLED: EN High Threshold ( mV)
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
400
400
-40
-20
0
20
40
60
80
100
-40
120
-20
0
20
Temperature (ᵒC)
60
80
100
120
1009
1008
1007
1006
1005
1004
1003
1002
1001
1000
999
998
Figure 14. WLED: EN Low Threshold vs Temperature
Vin = 5.5V
Vin = 5V
Vin = 3.6V
Vin = 3V
-40
-20
0
20
40
60
80
100
934
932
930
Vin = 5.5V
928
Vin = 5V
926
Vin = 3.6V
924
Vin = 3V
922
Y1264
WLED: OVP Low Threshold (mV)
936
Y1263
WLED: OVP High Threshold (mV)
Figure 13. WLED: EN High Threshold vs Temperature
920
-40
120
-20
0
20
Temperature (ᵒC)
40
60
80
100
120
Temperature (ᵒC)
Figure 15. WLED: OVP High Threshold vs Temperature
Figure 16. WLED: OVP Low Threshold vs Temperature
1.26
605
1.25
604
1.23
1.22
1.21
1.2
1.19
1.18
1.17
1.16
-40
-20
0
20
40
60
80
100
Temperature (ᵒC)
Figure 17. LCD: Switching Frequency vs. Temperature
120
603
602
601
600
599
598
597
596
Y1266
LCD: Feedback Voltage (mV)
1.24
Y1265
LCD: Switching Frequency (MHz)
40
Temperature (ᵒC)
595
-40
-20
0
20
40
60
80
100
120
Temperature (ᵒC)
Figure 18. LCD: Feedback Voltage vs Temperature
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
1.1
1.0
0.9
En VIL, Vin = 2.5V
0.8
En VIH, Vin = 2.5V
0.7
EN VIL, Vin = 5.5V
0.6
EN VIH, Vin = 5.5V
0.5
0.4
-40
Y1267
LCD: EN High/Low Threshold (V)
1.2
-20
0
20
40
60
80
100
120
Temperature (ᵒC)
Figure 19. LCD: EN High/Low Threshold vs Temperature
1.8
Vin = 5V
Vin =4.2V
2
Vin = 3.6V
Vin = 3.0V
1
(Ω)
1.2
0
-40
-20
0
20
40
60
80
100
Vin = 5V
1
0.8
Vin =4.2V
0.6
Vin = 3.6V
0.4
Vin = 3.0V
0.2
Y1269
3
1.4
LCD: DRVP NCH R
4
DS(ON)
1.6
5
Y1268
LCD: DRVP PCH R
DS(ON)
(Ω)
6
0
120
–40
–20
0
20
40
60
80
100
120
Temperature (ᵒC)
Temperature (ᵒC)
Figure 20. LCD: DRVP P Channel RDS(ON) vs Temperature
Figure 21. LCD: DRVP N Channel RDS(ON) vs Temperature
6
2.0
3
Vin =4.2V
2
Vin = 3.6V
Vin = 3.0V
1
0
-40
-20
0
20
40
60
80
100
120
Temperature (ᵒC)
Figure 22. LCD: DRVN P Channel RDS(ON) vs Temperature
(Ω)
DS(ON)
1.4
1.2
Vin = 5V
1.0
Vin =4.2V
0.8
Vin = 3.6V
0.6
Vin = 3.0V
0.4
0.2
0
-40
Y1271
Vin = 5V
1.6
LCD: DRVN NCH R
4
Y1270
LCD: DRVN PCH R
DS(ON)
(Ω)
1.8
5
-20
0
20
40
60
80
100
Figure 23. LCD: DRVN N Channel RDS(ON) vs Temperature
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10
120
Temperature (ᵒC)
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
1.64
700
1.58
1.56
Vin = 5V
1.54
Vin =4.2V
1.52
Vin = 3.6V
1.50
Vin = 3.0V
1.48
500
400
Vin = 5V
300
Vin =4.2V
Vin = 3.6V
200
Vin = 3V
100
Y1272
1.46
1.44
-40
600
-20
0
20
40
60
80
100
Y1273
LCD: Boost LX I
LIMIT
(A)
1.60
LCD: LX Switch R DS(ON) (mΩ)
1.62
0
120
-40
-20
0
20
Temperature (ᵒC)
Figure 24. LCD: Boost LX ILIMIT vs Temperature
60
80
100
100
90
90
80
80
70
70
50
6S3P
40
7S2P
30
8S3P
60
50
6S3P
40
7S2P
30
8S3P
20
20
10
10
Y1275
60
Efficiency (%)
100
0
0
0
20
40
60
120
Figure 25. LCD: LX Switch RDS(ON) vs Temperature
Y1274
Efficiency (%)
40
Temperature (ᵒC)
80
100
0
120
20
40
60
80
100
120
I LED Per Channel (mA)
I LED Per Channel (mA)
Figure 27. WLED: LED Efficiency vs LED Configuration
Figure 26. WLED: Boost Efficiency vs LED Configuration
100
140
90
120
80
ILED1
60
ILED2
40
ILED3
Efficiency (%)
70
80
60
50
40
30
20
0
0
100
200
I 2C
Code
Figure 28. WLED: LED Current Accuracy (RSET = 23.2 kΩ)
10
Y1277
20
Y1276
LED Current (mA)
100
0
0
100
200
300
LCD Load Current (mA)
Figure 29. LCD: Efficiency
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400
500
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
VEN
2 V/div
VEN
2 V/div
VOUT
5 V/div
VOUT
5 V/div
ISW
1 A/div
ISW
2 A/div
IOUT
0.2 A/div
IOUT
0.5 A/div
t0436
t0435
Time (200 μs/div)
Time (200 μs/div)
Figure 31. LCD: Enable Waveform (0.5 A Load)
Figure 30. LCD: Enable Waveform (0.2 A Load)
VEN
2 V/div
VEN
2 V/div
VOUT
5 V/div
VOUT
5 V/div
ISW
1 A/div
ISW
2 A/div
IOUT
0.2 A/div
IOUT
0.5 A/div
t0434
t0433
Time (200 μs/div)
Time (200 μs/div)
Figure 33. LCD: Disable Waveform (0.5 A Load)
Figure 32. LCD: Disable Waveform (0.2 A Load)
VSW
10 V/div
VSW
10 V/div
VOUT
0.2 V/div
VOUT
0.2 V/div
ISW
0.5 A/div
ISW
0.5 A/div
IOUT
0.1 A/div
IOUT
0.1 A/div
t0438
t0437
Time (40 μs/div)
Figure 34. LCD: Load Transient (10 mA to 100 mA Load)
Time (40 μs/div)
Figure 35. LCD: Load Transient (100 mA to 10 mA Load)
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
VSW
10 V/div
VSW
10 V/div
VOUT
0.5 V/div
VOUT
0.5 V/div
ISW
2 A/div
ISW
2 A/div
IOUT
0.5 A/div
IOUT
0.5 A/div
t0440
t0439
Time (10 μs/div)
Time (10 μs/div)
Figure 36. LCD: Load Transient (100 mA to 500 mA Load)
Figure 37. LCD: Load Transient (500 mA to 100 mA Load)
VSW
10 V/div
VSW
10 V/div
VOUT
20 mV/div
VOUT
50 mV/div
ISW
1 A/div
ISW
0.5 A/div
IOUT
0.5 A/div
IOUT
0.1 A/div
t0442
t0441
Time (400 ns/div)
Time (400 ns/div)
Figure 39. LCD: Work Waveform (0.5 A Load)
Figure 38. LCD: Work Waveform (0.1 A Load)
SCL (I2C)
2 V/div
VEN
2 V/div
VOUT
10 V/div
VOUT
10 V/div
ISW
1 A/div
ISW
0.5 A/div
ILED
50 mA/div
ILED
50 mA/div
t0446
t0445
Time (4 ms/div)
Figure 40. WLED: Enable via Enable Pin (60 mA Load)
Time (400 ms/div)
Figure 41. WLED: Enable via I2C interface (60 mA Load)
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
SCL (I2C)
2 V/div
VEN
2 V/div
VOUT
10 V/div
VOUT
10 V/div
ISW
1 A/div
ISW
0.5 A/div
ILED
50 mA/div
ILED
50 mA/div
t0444
t0443
Time (10 ms/div)
Time (200 ms/div)
Figure 42. WLED: Disable via Enable Pin (60 mA Load)
Figure 43. WLED: Disable via I2C interface (60 mA Load)
VSW
10 V/div
VSW
10 V/div
VOUT
10 V/div
VOUT
10 V/div
ISW
0.5 A/div
ISW
0.5 A/div
ILED
50 mA/div
ILED
50 mA/div
t0448
t0447
Time (400 ms/div)
Time (400 ms/div)
Figure 44. WLED: Load Transient (1 mA to 60 mA Load)
Figure 45. WLED: Load Transient (60 mA to 1 mA Load)
VSW
10 V/div
VSW
10 V/div
VOUT
20 mV/div
VOUT
50 mV/div
ISW
1 A/div
ILED
50 mA/div
ISW
0.5 A/div
ILED
10 mA/div
t0452
t0451
Time (800 ns/div)
Figure 46. WLED: Work Waveform without PWM (10 mA Load)
Time (800 ns/div)
Figure 47. WLED: Work Waveform without PWM (60 mA Load)
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
WPGND
WLX WLX
OVP
VL
OUT
IN
LED Driver Boost
Converter Control
WCOMP
Over-Voltage
Protection
REF
Reference
Internal
Reg.
Oscillator
Oscillator
Over-Temp
Shutdown
Over-Temp
Shutdown
LX
LED Driver Boost
Converter Control
WEN
PGND
FB
FOSC
+
Control Logic
And
Data ROM
PWM
IN
VREF
COMP
EN
Backlight
Current
Control
DGND
ISET
CS12
CS34
SDA
SCL
I2C Interface
CS56
VDD
Negative Charge
Pump Control
DRVN
FBN
+
VREF_N
Positive Charge
Pump Control
DRVP
FBP
+
VREF_P
t0096
SGND
Figure 48. SKYA21004 Functional Block Diagram
Functional Description
Setting the Output Voltage of Main Boost Converter
A functional block diagram is provided in Figure 48.
The resistive divider network of R20 and R22 (see Figure 56)
programs the AVDD output to regulate at a feedback voltage of
0.6 V. To limit the bias current required for the external
feedback resistor string while maintaining good noise immunity,
the minimum suggested value for R22 is 6.04 k. The resistive
divider can be calculated in the following equation:
Main Boost Converter
The main boost regulator contains a current-mode,
fixed-frequency PWM architecture to maximize loop bandwidth
and provide fast transient response to pulsed loads typical of
TFT-LCD panel source drivers. The 1.3 MHz switching
frequency allows the use of low-profile, low-value inductors and
ceramic capacitors to minimize the thickness of LCD panel
designs.

V

V
R20  R22   AVDD  1   R22   AVDD  1 
0
6
V
.
V


 FB

If the output of any of the regulators (AVDD or VGH or VGL)
drops below the fault trip point for more than 200 msec, the
AVDD boost turns off.
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Dual Charge-Pump Regulator
Positive Output Voltage (Vgh)
The SKYA21004 provides low-power regulated output voltages
from two individual charge pumps to provide the VGH and VGL
supplies. Using a single stage, the VGL charge pump inverts the
supply voltage (VDD) and provides a regulated negative output
voltage. The VGH charge pump doubles VDD and provides a
regulated positive output voltage. These outputs use external
Schottky diodes and capacitor multiplier stages (dependent
upon the required output voltage) to regulate up to ±30 V.
Integrated soft-start circuitry minimizes the start-up inrush
current and eliminates output voltage overshoot across the full
input voltage range and all load conditions. A constant
switching frequency of 1.3 MHz minimizes output ripple and
capacitor size.
The positive output voltage is set by a resistive divider from the
output (VGH) to the FBP and ground pins. To limit the bias
current required for the external feedback resistor string while
maintaining good noise immunity, the minimum suggested
value for R32 is 6.04 k.
Dual Charge-Pump Stages
The integrated high voltage boost (step-up) converter is
designed to drive multiple strings of series LEDs. The maximum
number of LEDs that can be driven by this device depends on
the current limit and the voltage rating of the boost. The
SKYA21004 LED driver can drive up to 28 V (up to about 7 or 8
series LEDs). The boost switch current limit can be set to a
minimum of either 2.75 A or 2.30 A to optimize the boost
operation for a given application.
The number of charge-pump stages required for a given output
(VGH) varies with the input voltage applied (VAVDD) from the main
boost. A lower input voltage requires more stages for a given
output. If the number of stages increases, the maximum load
current limitation of the charge pump decreases to maintain
output voltage regulation.
The number of stages required can be estimated by:
V  VIN
For the positive output:  P  GH
VDD  2VF
For the negative output:  N 
VGL
2VF  VDD
Once R32 is determined, calculate the value for R30:

V

 V
R30  R32   GH  1   R32   GH  1 
.
V
0
6
V


 FBP

LED Driver
The SKYA21004 drives up to three strings of backlight LEDs
with a boost converter.
Three precision current sinks provide a constant current drive to
each LED string. The full-scale LED current is set by a single
external resistor and may be programmed from 30 mA to
120 mA per string. The full-scale LED current is programmed
according to the following equation:
RSET 
Where:
VDD = VAVDD(MIN) – 2VF1 (V F1 = 0.7 V, the forward voltage of the
1N4148 diode [D2 and D3 in Figure 56] at 4 mA forward
current).
VF = 0.31 V, the forward voltage of the BAT54 Schottky diode
(D31, D32, D33, and D34 in Figure 56) at 4 mA forward current.
When solving for nP and nN, round up the calculated result to the
next integer number to determine the number of stages
required.
Negative Output Voltage (Vgl)
The negative output voltage is adjusted by a resistive divider
from the output (VGL) to the FBN and REF pins. The maximum
REF output current is 200 μA; therefore, the minimum allowable
value for R42 in Figure 56 is 6.04 kΩ. It is best to select the
smallest value possible for R42 to keep the value of R40 to a
minimum. With R42 selected, R40 can be determined:
R40 
V
VGL
 R42  GL  R42
1.2 V
VREF
600 mV
51 k

11
I CH _ MAX mA
The controller derives output feedback from the current sink
channel with the lowest current sink voltage while maintaining
the programmed current for each LED string. The LED string
current sink with the lowest operation voltage represents the
LED string with the greatest summed LED forward voltage (VF)
for the given operation condition. This ensures that the system
can operate with the lowest possible boost converter output
voltage and highest efficiency for continuous operation with
potentially mismatched LED strings.
The SKYA21004 LED driver block is designed for maximum
flexibility to allow unused current sinks to be disabled by
hardware configuration by connecting them to ground. The
SKYA21004 can also disable the unused current sinks through
software configuration. The maximum number of LEDs per
channel is set by the LED VF and the maximum output voltage of
the DC/DC switching boost converter.
The boost switching frequency can be adjusted from 600 kHz to
2 MHz using the FOSC signal for optimum efficiency and the
smallest external components. The relationship between
external set resistor (RFOSC) and switching frequency is shown
in Figure 49 and Table 5.
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Open/short LED protection circuitry protects the system from
LED fault damage.
information that allows the signal not to respond to input jitter.
This signal also has a 40-ns deglitch filter.
Fault Protection of LED Driver
Figure 49. Relationship between External Set Resistor (RFOSC)
and Switching Frequency
Table 5. Switching Frequency vs RFOSC
fOSC (kHz)
RFOSC (k)
fOSC (kHz)
RFOSC (k)
2034
10
856
24
1704
12
791
26
1466
14
737
28
1293
16
687
30
1136
18
664
32
1035
20
627
33
974
22
608
34
PWM Dimming
After the PWM signal is applied, the channels start to follow the
PWM signal with the maximum LED current determined by the
RSET resistor value. The maximum LED current can be
programmed from 30 mA to 120 mA by changing the RSET
resistance. The PWM input signal frequency range is 100 Hz to
25 kHz. In the direct PWM (DPWM-bit[4], PWMMD, in the
Control Register, REG2, is set as 1), dimming mode, the LED
current is set by using data in the Current Sink Dimming
Register, REG0, and the RSET resistance. The DPWM frequency
and duty follows the PWM signal. In the analog dimming mode
(APWM-bit[4], PWMMD, in the Control Register, REG2, is set as
0), the LED current is set by multiplying the PWM duty, REG0
data, and the RSET resistance. For example, if the PWM duty is
50 percent and REG0 data is set to 50 percent (0x80), the
output current is 25 percent of the maximum LED current,
which is set by the RSET resistance. When the PWM signal is not
used, it should be pulled high. To ignore the PWM signal for the
dimming control, set IGPW (bit[5] in the Control Register, REG2).
A change to the PWM duty is applied to the output on the next
rising edge of the PWM. In the phase-delay mode, the other
channels follow the preceding channel with a delay. The PWM
signal has hysteresis (typically 0.5 percent) on the duty
The SKYA21004 LED driver is protected from system faults
caused by open or shorted LED strings, over-temperature
operation, boost converter over-current limit or boost converter
output over-voltage conditions. The integrated thermal
shutdown, over-voltage protection, and over-current limit
protection are designed to prevent catastrophic damage to the
system. An open LED condition is detected by the internal
system control circuit at startup by monitoring a low voltage on
each LED current sink and disabling the open current sink while
LED strings operating normally continue to operate. A disabled
LED string remains disabled until the WEN signal or power is
cycled. A shorted LED string condition results in a higher
voltage appearing on the current sink of the affected channel.
That current sink dissipates additional power since the voltage
increases. To prevent thermal shutdown, the shorted LED string
is disabled while normal operating strings continue to function.
The shorted LED string remains disabled until a power-on or an
LED driver enable (WEN) is cycled
The SKYA21004 LED driver has a programmable boost current
limit to optimize the inductor for the given applications. The
default value is 2.75 A (minimum) and the boost current limit
can be switched to 2.30 A on an I2C interface.
The over-voltage protection of the SKYA21004 LED driver can
prevent the LED driver output from rising over the
preprogrammed OVP threshold level, and the OVP threshold
level can be set through external OVP set-up resistors.
The OVP threshold level is set according to the following
equation:
VOVP 
1V  R1  R2 
R2
Register Programming
The SKYA21004 LED driver is programmed using an I2C
interface. There are five programming registers to program the
LED driver block. Programming functions are described in
Table 6. Each register is 8 bits, as defined in Tables 7
through 11.
I2C Interface Protocol
The I2C protocol uses two open-drain inputs: serial data
line (SDA) and serial clock line (SCL). The I2C protocol is
bidirectional.
Devices on the I2C bus can either be a master or a slave. Both
master and slave devices can send and receive data over the
bus, but the master device controls all communication on the
bus.
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Bus communications begin by the master initiating a “start”
condition. Next, the master transmits the 7-bit slave address
and a read/write bit (R/W). Each slave device on the bus has a
unique address. The 7-bit slave address of the SKYA21004 is
0x2C (0101100b).
last. After each address or data transmission, the target device
transmits an ACK signal to indicate that it has received the
transmission. The ACK signal is generated by the target after
the master releases the SDA data line by driving SDA low.
An I2C interface timing diagram is shown in Figure 50. A Start
and Stop timing diagram is shown in Figure 51.
Write to Slave Device
When the read/write bit is cleared and the address transmitted
by the master matches the address of the slave device, the
slave device transmits an ACK signal to indicate that it is ready
to receive data.
Figures 52 and 53 illustrate the bit transfer of device addresses
and data.
Start and Stop Conditions
Next, the master transmits the 8-bit register address, and the
slave device transmits an ACK signal to indicate that it received
the register address. The master transmits the 8-bit data word,
and, again, the slave device transmits an ACK signal indicating
that it received the data. This process continues until the master
finishes writing to the slave device, at which time the master
generates a “stop” condition.
“Start” and “stop” conditions are always generated by the
master. Before initiating a “start,” both the SDA and SCL pins
are inactive and are pulled high through external pull-up
resistors.
As shown in Figure 51, a “start” condition occurs when the
master pulls the SDA line low. After the “start” condition hold
time (tHD_STA), the master strobes the SCL line low. A “start”
condition acts as a signal to devices on the bus that the device
producing the “start” condition is active and will be
communicating on the bus.
A write timing diagram is presented in Figure 54.
Read from Slave Device
When the read/write bit is set and the address transmitted by
the master matches the address of the slave device, the slave
device transmits an ACK signal to indicate that it is ready to
receive data.
A “stop” condition, as shown in Figure 51, occurs when the SCL
signal changes from low to high after the “stop” condition setup
time (tSU_STO), by an SDA low-to-high transition. The master
does not issue an Acknowledge (ACK) signal but does release
SCL and SDA.
Next, the slave device transmits the 8-bit data word, and the
master reads the data byte and transmits an ACK signal to
indicate that it received the byte. Finally, the master generates a
“stop” condition.
Transferring Device Address and Data
A read timing diagram is presented in Figure 55.
Addresses and data are sent with the Most Significant Bit (MSB)
transmitted first and the Least Significant Bit (LSB) transmitted
Table 6. Register Programming Functions
Register
Location
Name
(HEX)
REG0
00
Function
Current sink dimming
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit1
Bit 0
CS[7]
CS[6]
CS[5]
CS[4]
CS[3]
CS[2]
CS[1]
CS[0]
REG1
01
Channel enable
X
X
EN1[1]
EN1[0]
EN2[1]
EN2[0]
EN3[1]
EN3[0]
REG2
02
Control
X
X
IGPW
PWMMD
PHASE
ILIM
SHRT[1]
SHRT[0]
REG3
03
Reserved
X
X
X
X
X
X
X
X
REG4
04
Fault
OCP
OTMP
SHRT1
SHRT1
SHRT2
SHRT2
SHRT3
SHRT3
REG5
05
Fault
X
X
OPEN1
OPEN1
OPEN2
OPEN2
OPEN3
OPEN3
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Start
Start (Repeated)
Stop
Start
SDA
tf
tLOW
tSU,DAT
tr
tHD,STA
tSP
tr
tBUF
tf
SCL
tHD,STA
tHD,DAT
tSU,STA
tHIGH
tSU,STO
S3065
Figure 50. I2C Interface Timing Diagram
SDA
SDA
SCL
SCL
Start Condition
Stop Condition
S3064
2
Figure 51. I C Interface Start and Stop Timing Diagram
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
SCL
1
2
3
4
5
6
7
8
LSB
MSB
SDA
9
A6
A5
A4
A3
A2
A1
A0
R /W
ACK
Device Address
t0328
2
Figure 52. I C Device Address Transmission
SCL
1
2
3
4
5
6
7
9
LSB
MSB
SDA
8
D7
D6
D5
D4
D3
D2
D1
D0
ACK
Registers
Address/Data
t0329
2
Figure 53. I C Device Data Transmission
start
msb
Chip Address
lsb
w
ack
msb
Register Address
lsb
ack
msb
Register Data
lsb
ack
stop
SCL
SDA
start
SKYA21004 Device Address ID=2Ch
w
ack
Address=00h
ack
Address=00h Data=06h
ack
First Byte Writes as 0x58
t0330
2
Figure 54. I C Write Timing Diagram
start
msb
lsb
Chip Address
r
ack
r
ack
msb
Register Data
lsb
ack
stop
ack
stop
SCL
SDA
start
SKYA21004
7-bit Device Address ID=2Ch
Data=08h
First Byte Writes as 0x59
t0331
2
Figure 55. I C Read Timing Diagram
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Table 7. Current Sink Dimming Register, REG0
Parameter
Function
State Description
Default
Bits[7:0];
CS
Current Sink Dimming
00000000 = 0% of maximum LED current
11111111
●●●
11111111 = 100% of maximum LED current
Table 8. Channel Enable Register, REG1
Parameter
RSVD
Function
Reserved
State Description
Bits[7,6]
Default
00
Bits[5:4];
EN1[1:0]
Channel 1 enable
00: fully turn off
00
01, 10: half turn on
11: fully turn on
Bits[3:2];
EN2[1:0]
Channel 2 enable
00: fully turn off
00
01, 10: half turn on
11: fully turn on
Bits[1:0];
EN3[1:0]
Channel 3 enable
00: fully turn off
00
01, 10: half turn on
11: fully turn on
Table 9. Control Register, REG2
Parameter
Function
State Description
Default
RSVD
Reserved
Bits[7,6]
00
IGPW
Ignore PWM input
Bit[5];
0
0: receive PWM input
1: ignore PWM input
PWMMD
PWM dimming mode
Bit[4]
0
0: APWM
1: DPWM
PHASE
Phase shift enable
Bit[3];
0
0: phase shift enable
1: phase shift disable
ILIM
LED driver boost current limit
Bit[2];
0
0: 2.75A(min)
1: 2.3A(min)
SHRT[1:0]
LED short detection voltage
Bit[1,0];
00
00 = 7 V
01 = 6 V
10 = 5 V
11 = 4 V
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Table 10. Fault Register 1, REG4
Parameter
Function
State Description
Default
OCP
LED driver boost over current
Bit[7]
0
OTMP
LED driver over-temperature
Bit[6]
0
Bits[5:4];
SHRT1
CH1 LED short detect
00: CH1 no short
00
11: CH1 short detect
Bits[3:2];
SHRT2
CH2 LED short detect
00
00: CH2 no short
11: CH2 short detect
Bits[1:0];
SHRT3
CH3 LED short detect
00: CH3 no short
00
11: CH3 short detect
Table 11. Fault Register 2, REG5
Parameter
Function
RSVD
Reserved
OPEN1
CH1 LED open detect
State Description
Bit[7:6]
Default
00
Bits[5:4];
00: CH1 no open
00
11: CH1 open detect
Bits[3:2];
OPEN2
CH2 LED open detect
00: CH2 no open
00
11: CH2 open detect
Bits[1:0];
OPEN3
CH3 LED open detect
00: CH3 no open
00
11: CH3 open detect
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DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Evaluation Board Description
Package and Handling Information
The SKYA21004 Evaluation Board is used to test the
performance of the SKYA21004. An Evaluation Board schematic
diagram is provided in Figure 56. Layer details for the
Evaluation Board are shown in Figures 57.
Since the device package is sensitive to moisture absorption, it
is baked and vacuum packed before shipping. Instructions on
the shipping container label regarding exposure to moisture
after the container seal is broken must be followed. Otherwise,
problems related to moisture absorption may occur when the
part is subjected to high temperature during solder assembly.
Package Dimensions
The SKYA21004 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 C. It can be used for lead or lead-free soldering. For
additional information, refer to the Skyworks Application Note,
Solder Reflow Information, document number 200164.
Typical part markings are shown in Figure 58. Package
dimensions for the 36-pin QFN package are shown in Figure 59.
Tape and reel dimensions are shown in Figure 60.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format.
REF
IN
Test Point
VGH
2
1
R52
150 kΩ
C60 100 μF
NC
VGH
R 41
NC
GND
0Ω
L21
4.7 μΗ
LX
C 23
C 26
NC
C 27
AVDD
C15
8 nF
R15
45.3 kΩ
R13
10 kΩ
R14
1 MΩ
C2
470 nF,
16 V
C14
GND
C1
0.1 μF, 50 V
0.22 μF,
50 V
2
R51
150kΩ
CS12
R 12
AGND
34.8 kΩ
R 11
22 kΩ
AGND
CS34
31
32
33
34
35
36
CS12
CS34
CS56
IN
NC
R22
11 kΩ
C24
100 pF
200 kΩ
LX
PGND
FBP
EN
DRVP
VDD
ISET
FOSC
CS12
CS34
CS56
NC
C 45
NC
SDA
SDA
R53
150kΩ
L11
IN
2
Test Point
IN
Jumper
4.7 μH
C11
4.7 μF, 16 V
C61
100 μF, NC
3
DRV N
3
R35
NC
5
C 36
0.22 μF, 50 V
C 37
6
1
0.1 μF,
50 V
C17
2.2 μF, 100 V
GND
P1
AGND
OUT
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
AGND
CS12
CS34
CS56
R36
NC
GND
2
C 38
0.22 μF, 50 V
GND
GND
P2
AGND
SCL
SDA
OUT
R30
301 kΩ
FBP
AGND
4
0.1 μF,
50 V
R 31
NC
GND
D 32
C 35
C13
2.2 μF, 100 V
_
R 32
10 kΩ
C 34
0.22 μF, 50 V
BAT 54 SDW
AGND
R34
0Ω
GND
2
BAT 54 SDW
C12
2.2 μF, 100 V
IN
VGH
R33
C 32
NC
0.22 μF, 50 V
1
0.1 μF,
50 V
OUT
AVDD
D2
1N4148
5
6
D 11
SS16L
R38
0Ω
C 33
C4
1 μF, 50 V
D3
1N4148
R37
0Ω
4
0.1 μF,
50 V
AGND
PWM
BAT 54 SDW
0.1 μF,
50 V
D 31
DRVP
FBP
EN
DRVP
SCL
1
PWM
3
C 31
GND
Test Point
J6
4
GND
C5
0.22 μF,
50 V
AGND GND
Test Point
SCL
REF
FBN
Test Point
5
0.1 μF,
50 V
C 47
C 48
0.22 μF,
50 V
LX
18
17
16
15
14
13
0
1
2
3
4
5
6
7
8
9
10
11
12
PW M
OUT
6
VDD
Test Point
OUT
1
GND
R 46
V DD
CS56
0.1 μF,
50 V
D42
C 46
0.22 μF,
50 V
U1
SKYA21004
EP
SGND
GND
PWM
WPGND
WPGND
WLX
WLX
GND
REF
FBN
GND
DRVN
Test Point
CS56
3
BAT 54 SDW
R 45
R23
OUT
W EN
SD A
SC L
AGND
SDA
WCOMP
WEN
OVP
OUT
DGND
SCL
VL
IN
AGND
FB
COMP
IN
Test Point
CS34
4
2
AVDD
R20
R21
226 kΩ NC
DRVN
C 43
C22/C23,C26/C27,
2.2 μF, 50 V
30
29
28
27
26
25
24
23
22
21
20
19
J5
WEN
1
Test Point
5
0.1 μF,
50 V
C 44
0.22 μF,
50 V
AGND
CS12
6
GND
Test Point
WEN
1
GND
R 44
AVDD
C 22
SS16L
AGND
C 42
0.22 μF,
50 V
D21
VGL
VDD
C 41
R 43
VGL
Test Point
AVDD
D41
2
GND
10 μF, 16 V
Test Point
VDD
R40
37.4 kΩ
C 21
Test Point
VGL
FBN
C62
100 μF, NC
+
+
R 42
6.04 kΩ
_
IN
EN
Test Point
IN
IN
J4
EN
1
3
5
7
9
2
4
6
8
10
SDA
SCL
AGND
Header 5X2
t0325
Header 10X 2
Figure 56. SKYA21004 Evaluation Board Schematic
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23
Y1220
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Top Side
Bottom Side
Figure 57. SKYA21004 Evaluation Board Layer Details
Skyworks
Part Number
Lot Number
Pin 1
Indicator
Y1522
Date Code:
YY = Calendar Year
WW = Week
CC = Country Code
Figure 58. Typical Part Markings
(Top View)
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April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E
C
4.00
A
B
Pin 1
Indicator
Plane
Seating
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
36× 0.200 MIN
0.02 + 0.03
– 0.02
31
Pin 1 indicator
R0.20
36
1
30
7.00
5.70 ± 0.05
0.5 pitch
Exposed pad
12
19
2×
0.05 C
2×
See ‘Detail A’
0.85 ± 0.05
0.05 C
Top View
0.05 C
0.08 C
3
13
18
2.70 ± 0.05
36×
Bottom View
Side View
Scale: 100×
6× this rotation
6× rotated 180º
12× rotated 90ºCW
12× rotated 90ºCCW
0.35 ± 0.05
Notes:
1. Dimensioning and tolerancing per ASME Y14.5M-2009.
2. All dimensions are in millimeters.
3. Coplanarity applies to the terminals and all other bottom surface metallization.
4. Plating requirment per source control drawing (SCD) 2504.
5. Dimensions applies to metalized terminal. If the terminal has a radius on its end,
the width dimension should not be measured in the radius area.
0.25 ± 0.05
Detail A
0.10 M C A B
0.05 M C
5
t0459
Figure 59. SKYA21004 36-Pin QFN Package Dimensions
Ø1.5 ± 0.1/0
Pin #1
0.30 ± 0.05
2.0 ± 0.1
4.0 ± 0.1
1.75 ± 0.10
7.5 ± 0.1
7.30 ± 0.10
16.0 ± 0.3
B
A
A
Ø1.5 Min.
B
8.00 ± 0.10
1.00 ± 0.10
Section B-B
0
0.5
Ref. 0.50
4.3 ± 0.1
f. R
Re
user feed
direction
Section A-A
Notes:
1. Carrier tape must meet all requirements of Skyworks GP01-D232 procurement spec for tape and reel shipping.
2. Carrier tape shall be black conductive polystyrene.
3. ESD-surface resistimity shall be <1x1010 ohms/square per EIA JEDEC TNR specification.
4. Cumulative tolerance of 10 sprocket holes pitch is ±0.20 mm.
5. All measurements are in millimeters.
t0327
Figure 60. SKYA21004 Tape and Reel Dimensions
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25
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
Ordering Information
Model Name
SKYA21004: Three-Channel LCD Bias Power Management IC with
Three-Channel High Efficiency White LED Driver
Manufacturing Part Number
Evaluation Board Part Number
SKYA21004
SKYA21004-EVB
Copyright © 2013-2015 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
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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 PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY
DISCLAIMED. SKYWORKS DOES 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,
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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 and the Skyworks symbol 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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