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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 202949E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 17, 2015 3 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 Units April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 V April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 7 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 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 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 9 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 120 Temperature (ᵒC) April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 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) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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) 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 13 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) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 14 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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. 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 15 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 16 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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. 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 17 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 18 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 19 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 20 stop April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 21 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 22 April 17, 2015 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202949E 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 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 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) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 24 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 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 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. 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