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PDF SKYA21004 Data sheet ( Hoja de datos )
| Número de pieza | SKYA21004 | |
| Descripción | Three-Channel LCD Bias Power Management IC | |
| Fabricantes | Skyworks | |
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DATA SHEET
SKYA21004: Three-Channel LCD Bias Power Management IC
with Three-Channel High-Efficiency White LED Driver
Applications
Automotive displays
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)
Description
The SKYA21004 consists of a power management block
supplying LCD bias rails and a three-channel backlight driver.
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
1 page  
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
Quiescent supply current
Input shutdown current
Reference voltage
Over-temperature shutdown threshold
Maximum input logic low
Minimum input logic high
VIN
IQ
ISHDN
VREF
TSD
VIL
VIH
VEN = VWEN = high, VIN = 3.6 V
VEN = VWEN = 0 V, VIN = 3.6 V
No load, VIN = 3.6 V
2.8 5.5 V
4.7 mA
2 A
1.18 1.2 1.22
V
140 ºC
0.4 V
1.4 V
LCD Bias Boost Section (AVDD)
Output voltage
Operating frequency
Maximum duty cycle
FB regulation voltage
FB fault trip level
FB load regulation
FB input bias current
LX on resistance
LX leakage current
LX current limit
Soft-start time
VAVDD
fOSC
DMAX
VFB
VAVDD/IAVDD
IFB
RLX(ON)
ILX_LEAK
ILIM
tss
No load
VFB falling
0 < IAVDD < full load
VFB = 0.7 V
ILX = 200 mA
VLX = 13.2 V
No load
VIN + 1
910
86
0.588
0.528
1
1
1300
90
0.6
0.548
0.01
350
0.01
1.3
14.5
1690
0.612
0.568
+1
700
20
V
kHz
%
V
V
%/mA
A
m
A
A
ms
Gate On Charge-Pump Driver (VGH)
VDD input voltage range
FBP regulation voltage
FBP fault trip level
DRVP P-Ch on resistance
DRVP N-Ch on resistance
VDD
VFBP
VFBP
DRVPPRDS
DRVPNRDS
VFBP rising
VFBP = 0.585 V
2.8
0.588
0.457
0.6
0.487
3
1.5
13.2
0.612
0.517
6
3
V
V
V
Gate Off Charge-Pump Driver (VGL)
VDD input voltage
FBN regulation
FBN fault trip level
DRVN P-Ch on resistance
DRVN N-Ch on resistance
VDD
VFBN
VFBN
DRVNPRDS
DRVNNRDS
VFBN rising
VFBN = 0.035 V
2.8 13.2
50 0
50
0.403 0.43 0.457
36
1.5 3
V
mV
V
LED Driver Boost Converter
Over-voltage threshold
Over-voltage hysteresis
Soft-start time
Oscillator frequency
Switch on resistance
VOVP
VOVP_HYS
tSS
fOSC
RDSON
VIN = 3.6 V
VIN = 3.6 V
VIN = 3.6 V
VIN = 3.6 V
0.91 1.00 1.09
V
100 mV
2.5 ms
600 2000 kHz
150 m
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
5
5 Page 
DATA SHEET • SKYA21004: THREE-CHANNEL LCD BIAS POWER MANAGEMENT IC WITH THREE-CHANNEL HIGH EFFICIENCY WHITE LED DRIVER
1.64
1.62
1.60
1.58
1.56
1.54
1.52
1.50
1.48
1.46
1.44
-40 -20
0
20 40 60 80 100 120
Temperature (ᵒC)
Vin = 5V
Vin =4.2V
Vin = 3.6V
Vin = 3.0V
Figure 24. LCD: Boost LX ILIMIT vs Temperature
100
90
80
70
60
50
40
30
20
10
0
0
20 40 60 80 100 120
ILED Per Channel (mA)
6S3P
7S2P
8S3P
Figure 26. WLED: Boost Efficiency vs LED Configuration
140
120
100
80
ILED1
60 ILED2
40 ILED3
20
0
0 100 200
I2C Code
Figure 28. WLED: LED Current Accuracy (RSET = 23.2 kΩ)
700
600
500
400 Vin = 5V
300 Vin =4.2V
Vin = 3.6V
200
Vin = 3V
100
0
-40 -20 0 20 40 60 80 100 120
Temperature (ᵒC)
Figure 25. LCD: LX Switch RDS(ON) vs Temperature
100
90
80
70
60
50
40
30
20
10
0
0
20 40 60 80 100 120
ILED Per Channel (mA)
6S3P
7S2P
8S3P
Figure 27. WLED: LED Efficiency vs LED Configuration
100
90
80
70
60
50
40
30
20
10
0
0
100 200 300
LCD Load Current (mA)
Figure 29. LCD: Efficiency
400
500
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
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet SKYA21004.PDF ] | |
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