DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit General Description Features The AAT2863 is a highly integrated charge pump-based lighting management unit with four linear regulators optimized for single-cell lithium-ion/polymer systems. The charge pump provides power for all LED outputs and multiple LED configurations are available. The LED control current sinks can be programmed up to 30mA each and the two AUX LED outputs can be programmed up to 60mA each. • Input Voltage Range: 2.7V to 5.5V • Tri-Mode Charge Pump • Drives up to Six LEDs • Programmable Backlight Current via I2C Interface ▪ 30mA Maximum Current per Channel ▪ 60mA Maximum Current per Auxiliary Channel ▪ 32 Linear Current Settings • Independent Main/Sub Settings ▪ Main Backlight BL1-BL6 ▪ Main Backlight BL1-BL5 + 1 AUX ▪ Main Backlight BL1-BL4 + 2 Sub (default) ▪ Main Backlight BL1-BL4 + 2 AUX • PWM Control ▪ 60Hz to 100kHz • 600k to 1.2MHz Switching Frequency • Automatic Soft Start •I2C Selectable Drivers • Four Linear Regulators ▪ 1 x 300mA Output LDO ▪ 3 x 150mA Output LDOs •I2C Programmable Output Voltage from 1.2V to 3.3V • Output Auto-Discharge for Fast Shutdown • Built-In Thermal Protection • -40°C to 85°C Temperature Range • TQFN34-24 Package An I2C serial digital interface is used to enable, disable, and set the LED current to one of 32 levels. In addition the 6 LED channels, including two AUX channels, can be configured between MAIN/SUB. High power auxiliary channels' current matching is better than 5% for matched LED color and brightness. A separate PWM input allows the LED current sinks to be modulated at high frequencies as required by CABC or Dynamic backlight power saving schemes. The AAT2863 also provides four high-performance lownoise MicroPower™ low dropout (LDO) linear regulators. The regulators are enabled and their output voltages are I2C programmable. One MicroPower™ LDO has a load current rating of 300mA and three LDOs have load current ratings of 150mA. Single LDO operating current is less than 80µA, making the AAT2863 ideal for battery-operated applications. The AAT2863 is available in a Pb-free, space-saving TQFN34-24 package and operates over the -40°C to 85°C ambient temperature range. Applications • Camera Enabled Mobile Devices • Digital Still Cameras • Multimedia Mobile Phones Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 1 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Typical Application Circuit VBAT 3.6V CF1 1µF CF2 1µF C1+ C1IN C2+ C2OUT CIN 4.7µF VOUT WLEDs COUT 2.2µF IN PWM ENABLE SDA I2C Serial Interface SCL PWM EN BL1 BL2 BL3 BL4 BL5/AUX1 BL6/AUX2 SDA LDOA SCL AAT2863 LDOB VOUTA at 300mA COUTA 2.2µF VOUTB at 150mA COUTB 2.2µF LDOC VOUTC at 150mA COUTC 2.2µF LDOD VOUTD at 150mA COUTD 2.2µF AGND 2 PGND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Pin Descriptions Pin # Symbol Function 1 OUT O 2 C2+ I 3 4 SDA SCL I I 5 EN I 6 7 AGND IN G PI 8 LDOC O 9 LDOB O 10 LDOA O 11 LDOD O 12 BL1 O 13 BL2 O 14 BL3 O 15 BL4 O 18 BL6/ AUX2 BL5/ AUX1 N/C 19 PWM I 20 21 22 PGND C2C1- G I I 23 IN PI 24 C1+ I 16 17 EP O O Description Charge pump output. OUT supplies current to the backlight LEDs. Connect the backlight and flash LED anodes to OUT. Bypass OUT to PGND with a 2.2μF or larger ceramic capacitor as close to the AAT2863 as possible. Positive terminal of charge pump capacitor 2. Connect the 1μF charge pump capacitor 2 from C2+ to C2-. I2C serial data input. SDA is the data input of the I2C serial interface. Drive SDA with the I2C data. I2C serial clock input. SCL is the clock input of the I2C serial interface. Drive SCL with the I2C clock. Programming enable input. When EN is strobed high, the backlight and LDO registers can be programmed via the I2C serial interface. When EN is strobed low, all backlight and LDO outputs are turned off and the backlight and LDO registers are reset to their default (POR) values and forces all LDO outputs to 0V. Analog ground. Connect to PGND as close to the AAT2863 as possible Input power pin for all four LDOs. Connect Pin 7 to Pin 23 with as short a PCB trace as practical. LDO C 150mA regulated voltage output. Bypass LDOA to AGND with a 2.2μF or larger ceramic capacitor as close to the AAT2863 as possible. LDO B 150mA regulated voltage output. Bypass LDOB to AGND with a 2.2μF or larger capacitor as close to the AAT2863 as possible. LDO A 300mA regulated voltage output. Bypass LDOC to AGND with a 2.2μF or larger capacitor as close to the AAT2863 as possible. LDO D 150mA regulated voltage output. Bypass LDOD to AGND with a 2.2μF or larger ceramic capacitor as close to the AAT2863 as possible. Backlight LED 1 current sink. BL1 controls the current through backlight LED 1. Connect the cathode of backlight LED 1 to BL1. If not used, connect BL1 to OUT. Backlight LED 2 current sink. BL2 controls the current through backlight LED 2. Connect the cathode of backlight LED 2 to BL2. If not used, connect BL2 to OUT. Backlight LED 3 current sink. BL3 controls the current through backlight LED 3. Connect the cathode of backlight LED 3 to BL3. If not used, connect BL3 to OUT. Backlight LED 4 current sink. BL4 controls the current through backlight LED 4. Connect the cathode of backlight LED 4 to BL4. If not used, connect BL4 to OUT. Backlight or auxiliary LED 6 current sink. BL6 controls the current through backlight LED 6. Connect the cathode of backlight LED 6 to BL6. If not used, connect BL6 to OUT. Backlight or auxiliary LED 5 current sink. BL5 controls the current through backlight LED 5. Connect the cathode of backlight LED 5 to BL5. If not used, connect BL5 to OUT. No connection. PWM input pin. Apply a PWM signal of varying duty cycle to modulate the LED current on BL1, BL2, BL3, BL4, BL5 & BL6 (Default). PWM frequency can vary up to 100kHz. The LED current maximum will be set at the default setting if no programming is applied. If not used, connect PWM to IN. Power ground. Connect to AGND as close to the AAT2863 as possible. Negative terminal of charge pump capacitor 2. Negative terminal of charge pump capacitor 1. Power input. Connect IN to the input source voltage. Bypass IN to PGND with a 4.7μF or larger ceramic capacitor as close to the AAT2863 as possible. Positive terminal of charge pump capacitor 1. Connect the 1μF charge pump capacitor 1 from C1+ to C1-. Exposed paddle (bottom) Connect to PGND/AGND as close to the AAT2863 as possible. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 3 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Pin Configurations TQFN34-24 (Top View) PGND C2C1IN C1+ 24 OUT C2+ SDA SCL EN AGND IN 23 22 21 20 1 19 2 18 3 17 4 16 5 15 6 14 7 13 8 9 10 11 PWM N/C BL5/AUX1 BL6/AUX2 BL4 BL3 BL2 12 BL1 LDOD LDOA LDOB LDOC Programmable Current Sink Options Main Channels Sub Channels Aux1 Channel Aux2 Channel 6 5 4* 4 0 1 2* 0 0 0 0* 1 0 0 0* 1 * Default. Absolute Maximum Ratings1 TA = 25°C unless otherwise noted. Symbol Description IN, OUT, BL1, BL2, BL3, BL4, BL5/AUX1, BL6/AUX2 Voltage to PGND and AGND C1+, C2+ Voltage to PGND and AGND C1-, C2-, LDOA, LDOB, LDOC, LDOD, EN, PWM, SDA, SCL Voltage to PGND and AGND PGND Voltage to AGND Value Units -0.3 to 6.0 -0.3 to VOUT + 0.3 -0.3 to VIN + 0.3 -0.3 to 0.3 V Thermal Information2,3 Symbol ΘJA PD TJ TLEAD Description Thermal Resistance Maximum Power Dissipation Operating Junction Temperature Range Maximum Soldering Temperature (at Leads) Value 50 2 -40 to 150 300 Units O C/W W °C 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Derate 20 mW/°C above 25°C ambient temperature. 3. Mounted on a FR4 circuit board. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Electrical Characteristics1 VIN = 3.6V; CIN = COUT = 2.2μF; C1 = C2 = 1µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol VIN IIN Description IN Operating Current IIN(SHDN) IN Shutdown Current Over-Temperature Shutdown TSD Threshold Over-Temperature Shutdown TSD(HYS) Hysteresis Charge Pump Section VOUT OUT Output Voltage IOUT(MAX) OUT Maximum Output Current BL1-BL6 Charge Pump Mode VIN(TH_H, BL) Transition Hysteresis fOSC Charge Pump Oscillator Frequency tCP(SS) Charge Pump Soft-start Time BL1-BL4, BL5/AUX1, BL6/AUX2 LED Drivers tLED(SU) LED Output Current Start-up Time IAUX[1/2](MAX) IAUX[1/2](DATA13) ΔIAUX[1/2]/ IAUX(AVG) IBL_(MAX) IBL_(DATA29) ΔIPWM[BL1-BL6]/ IPWM[BL1-BL6] VBL_(TH) Conditions Min IN Operating Voltage Range AUX Maximum Current AUX Current AUX1/AUX2 Current Matching BL1-BL6 Maximum Current BL1-BL6 Current BL1-BL6 PWM Current Accuracy BL1-BL6 Charge Pump Transition Threshold Typ Max Units 0.15 5.5 0.20 V mA 3.0 mA 5.0 mA 225 µA 80 µA 1.0 µA 2.7 1X Mode; 3.0 ≤ VIN ≤ 5.5; LDOs OFF; No Load 1.5X Mode; 3.0 ≤ VIN ≤ 5.5; LDOs OFF; Charge Pump ON; No Load 2X Mode; 3.0 ≤ VIN ≤ 5.5; LDOs OFF; Charge Pump ON; No Load 2.7 ≤ VIN ≤ 5.5; All LDOs ON; Charge Pump OFF; No Load 2.7 ≤ VIN ≤ 5.5; Any One LDO ON; Charge Pump OFF; No Load EN= GND 150 °C 15 °C VIN = 3.0V, VOUT = 4.0V 5.2 800 V mA EN/SET = IN; VIN – VF = 1V 150 mV TA = 25°C, TA = 25°C, TA = 25°C, TA = 25°C, TA = 25°C Address Address Address Address 07h 07h 07h 07h Data=00 Data=10 Data=20 Data=30 (0000 (0001 (0010 (0011 OUT: 0V to IN Address 05h Data=E0(1110 0000) Address 06h Data=E0(1110 0000) Address 05h Data=AC(1010 1100) Address 06h Data=AC(1010 1100) Address 05h Data=E0(1110 0000) Address 06h Data=E0(1110 0000) Address 03h, Data=E0 (1110 0000) Address 03h, Data=FD (1111 1101) Duty Cycle = 10%, FPWM = 10kHz, VIN - VF = 1.5V Address 03h, Data=E0 (1110 0000) 0000) 0000) 0000) 0000) 0.6 0.8 1.2 0.6 100 MHz µs 20 54 60 µs 66 18.4 27 1.75 30 1.94 mA mA 5 % 33 2.13 mA mA 2.5 % 180 mV 1. The AAT2863 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. Current matching is defined as the deviation of any sink current from the average of all active channels. 3.VDO[A/B/C/D] is defined as VIN – LDO[A/B/C/D] when LDO[A/B/C/D] is 98% of nominal. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 5 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Electrical Characteristics (continued)1 VIN = 3.6V; CIN = COUT = 2.2μF; C1 = C2 = 1µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Description Linear Regulators ΔVOUT[A/B/C,D]/ LDOA, LDOB, LDOC, LDOD Output VOUT[A/B/C,D] Voltage Tolerance IOUT[A](MAX) LDOA Maximum Load Current VOUT[A](DO) LDOA Dropout Voltage3 LDOB, LDOC, LDOD Maximum Load IOUT[B/C,D](MAX) Current VOUT[B/C,D](DO) LDOB, LDOC, LDOD Dropout Voltage3 ∆VOUT/ Line Regulation VOUT*∆VIN LDOA, LDOB, LDOC, LDOD Power PSRR[A/B/C,D] Supply Rejection Ratio LDOA, LDOB, LDOC, LDOD AutoROUT_(DCHG) Discharge Resistance I2C Logic, PWM Input and Control Interface SDA, SCL, PWM, EN Input Low VIL Threshold SDA, SCL, PWM, EN Input High VIH Threshold VOL SDA Output Low Voltage IIN SDA, SCL, EN Input Leakage Current fPWM PWM input Frequency Range fSCL SCL Clock Frequency tLOW SCL Clock Low Period tHIGH SCL Clock High Period tHD_STA Hold Time START Condition tSU_STA Setup Time for Repeat START tSU_DAT SDA Data Setup Time tHD_DAT SDA Data HOLD Time tSU_STO Setup Time for STOP Condition Bus Free Time Between STOP and tBUF START Conditions Conditions Min IOUT = 1mA to 150mA; TA = 25°C IOUT = 1mA to 150mA; TA = -40°C to +85°C -1.5 -3.0 300 VOUT[A/B/C/D] ≥ 3.0V; IOUT = 300mA Typ 60 Max Units 1.5 3.0 % % mA mV 150 150 VOUT[A/B/C/D] ≥ 3.0V; IOUT = 150mA mA 60 VIN = (VOUT[A/B/C/D] + 1V) to 5V IOUT[A/B/C/D] = 10mA, 1kHz IPULLUP = 3mA VSDA = VSCL = VPWM = VLED_SEL = VLDO_SEL = 5V mV 0.09 %/V 50 dB 20 Ω 2.7V ≤ VIN ≤ 5.5V 2.7V ≤ VIN ≤ 5.5V 150 0.4 1.4 -1 0.6 0 1.3 0.6 0.6 0.6 100 0 0.6 V V 0.4 1 100 400 0.9 1.3 V µA kHz kHz µs µs µs µs ns µs µs µs 1. The AAT2863 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit I2C Interface Timing Details SDA TSU_DAT TLOW THD_STA TBUF SCL THD_STA THD_DAT THIGH TSU_STA TSU_STO Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 7 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Typical Characteristics Backlight Efficiency vs. Input Voltage Backlight Current Matching vs. Temperature Backlight Output Current (mA) (VIN = 3.6V; 30mA/ch) 100 90 Efficiency (%) 80 70 60 50 40 30 20 10 0 2.7 30mA/ch, VF = 3.25V 20.32mA/ch, VF = 3.14V 14.52mA/ch, VF = 3.05V 4.84mA/ch, VF = 2.85V 3.1 3.5 3.9 4.3 4.7 5.1 Input Voltage (V) 5.5 33 BL1 BL2 BL3 BL4 AUX1 AUX2 32 31 30 29 28 27 -40 -15 (VIN = 3.5V; 30mA/ch) SDA (2V/div) 0V VOUT (2V/div) 0V VSINK (2V/div) 0V VSINK (2V/div) 0V IIN (100mA/div) 0A IIN (100mA/div) 0A Time (200µs/div) 60 Turn On to 1.5x Mode Backlight (VIN = 4.5V; 30mA/ch) VOUT (2V/div) 35 Temperature (°C) Turn On to 1x Mode Backlight SDA (2V/div) 10 Time (200µs/div) Turn On to 2x Mode Backlight (VIN = 3.2V; 30mA/ch) SDA (2V/div) VOUT (2V/div) VSINK (2V/div) IIN (200mA/div) 0V 0V 0A Time (200µs/div) 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 85 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Typical Characteristics Charge Pump Output Turn On Characteristic Turn Off from 1.5x Mode Backlight (VIN = 3.6V; ILED = 0mA; COUT = 2.2µF) (VIN = 3.5V; 30mA/ch) 0V VEN (top) (V) VDIODE (2V/div) 4.0 0V 2.0 0.0 4.0 3.0 2.0 1.0 IIN (200mA/div) 0.0 Charge Pump Output (bottom) (V) VEN (2V/div) 0A Time (200µs/div) Time (50µs/div) 0 50 0 -50 Time (500ns/div) 10 0 20 10 0 -10 -20 Time (500ns/div) LDO B/C/D Output Voltage vs. Temperature (VIN = 3.6V; ILDO = 0mA) (VIN = 3.6V; ILDO = 0mA) 1.5 LDOB/C/D Output Voltage Deviation (%) 1.5 1 0.5 0 -0.5 VOUT = 3.3V VOUT = 1.2V -1 -1.5 -40 20 LDO A Output Voltage vs. Temperature LDOA Output Voltage Deviatoin (%) Input Voltage (AC coupled) (top) (mV) 10 (VIN = 3.0V; 30mA/ch Backlight; 2x Mode; COUT = 2.2µF; fOSC = 1.2MHz) Charge Pump Output Voltage (AC coupled) (bottom) (mV) 20 Operating Characteristic Charge Pump Output Voltage (AC coupled) (bottom) (mV) Input Voltage (AC coupled) (top) (mV) Operating Characteristic (VIN = 3.3V; 30mA/ch Backlight; 1.5x Mode; COUT = 2.2µF; fOSC = 1.2MHz) -15 10 35 Temperature (°C) 60 85 1 0.5 0 -0.5 VOUT = 3.3V VOUT = 1.2V -1 -1.5 -40 -15 10 35 60 85 Temperature (°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 9 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Typical Characteristics LDO B/C/D Load Regulation (VIN = 3.6V) 1.5 (VIN = 3.6V) 1.5 VOUT = 3.3V VOUT = 1.2V 1.0 LDO B/C/D Output Voltage Deviation (%) LDO Output Voltage Deviation (%) LDO A Load Regulation 0.5 0.0 -0.5 -1.0 -1.5 0.1 1 10 100 Load Current (mA) 0.5 0.0 -0.5 -1.0 -1.5 1000 0.1 LDO Output Deviation (%) LDO Output Deviation (%) VOUT = 3.3V VOUT = 1.2V 1.0 0.5 0.0 -0.5 -1.0 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Load Current (mA) LDO A Load Transient Response VLDOA (100mV/div) 10 (ILDO = 10mA) 1.0 0.5 0.0 -0.5 VOUT = 3.3V VOUT = 1.8V -1.0 -1.5 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Load Current (mA) LDO B/C/D Load Transient Response (ILDO = 10mA to 200mA; VIN = 3.6V; VOUT = 1.8V; CLDO = 2.2µF) 200 200 ILDOB/C/D (200mA/div) 0 1.9 0 1.9 1.8 VLDOB/C/D (100mV/div) 1.7 Time (10µs/div) 1000 1.5 (ILDO = 10mA to 200mA; VIN = 3.6V; VOUT = 1.8V; CLDO = 2.2µF) ILDOA (200mA/div) 100 Load Current (mA) VOUT = 1.8V VOUT = 3.3V 1.5 10 LDO B/C/D Line Regulation (ILDO = 10mA) 2.7 1 LDO A Line Regulation -1.5 VOUT = 3.3V VOUT = 1.2V 1.0 1.8 1.7 Time (20µs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Typical Characteristics EN, SDA, SCL Input Low Threshold Voltage vs. Input Voltage 1.4 1.2 1.3 1.1 VEN(L), VSDA(L), VSCL(L) (V) VEN(H), VSDA(H), VSCL(H) (V) EN, SDA, SCL Input High Threshold Voltage vs. Input Voltage 1.2 1.1 1.0 0.9 0.8 0.7 -40°C 25°C 85°C 0.6 0.5 0.4 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 1.0 0.9 0.8 0.7 0.6 0.5 0.3 0.2 2.7 2.9 3.1 3.3 4.7 4.9 5.1 5.3 5.5 Input Voltage (V) (VOUTA = 3.3V) 3.7 IOUT = 150mA IOUT = 200mA IOUT = 250mA IOUT = 300mA Output Voltage (V) Output Voltage (V) IOUT = 0mA IOUT = 10mA IOUT = 50mA IOUT = 100mA 3.1 2.8 2.5 2.2 3.4 3.1 2.8 IOUT = 0mA IOUT = 10mA IOUT = 50mA IOUT = 100mA 2.5 2.2 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Input Voltage (V) 2.7 2.8 2.9 3.3 2.8 2.5 2.2 2.8 2.9 3.0 3.1 3.2 3.3 Input Voltage (V) 3.4 3.5 3.6 3.5 3.6 3.4 3.1 IOUT = 0mA IOUT = 10mA IOUT = 50mA IOUT = 100mA IOUT = 150mA 2.8 2.5 2.2 2.7 3.4 3.7 Output Voltage (V) 3.1 3.2 (VOUTA = 3.3V) IOUT = 0mA IOUT = 10mA IOUT = 50mA IOUT = 100mA IOUT = 150mA 3.4 3.1 LDO B/C/D Dropout Characteristics (VOUTA = 2.8V) 3.7 3.0 IOUT = 150mA IOUT = 200mA IOUT = 250mA IOUT = 300mA Input Voltage (V) LDO B/C/D Dropout Characteristics Output Voltage (V) 4.7 4.9 5.1 5.3 5.5 LDO A Dropout Characteristics (VOUTA = 2.8V) 3.4 3.5 3.7 3.9 4.1 4.3 4.5 Input Voltage (V) LDO A Dropout Characteristics 3.7 -40°C 25°C 85°C 0.4 3.7 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 11 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Functional Block Diagram C1+ C1- C2+ C2- 1x/1.5x/2x Tri-Mode Charge Pump IN IN OUT MAIN BL1 EN PWM SDA SCL BL2 I2C Serial Interface and PWM Control BL3 Constant Current Sink Control Logic BL4 AUX1/BL5 AUX1 AUX2/BL6 AUX2 300mA Linear Regulator LDOA LDOA 150mA Linear Regulator LDOB LDOB 150mA Linear Regulator LDOC LDOC 150mA Linear Regulator LDOD LDOD AGND Functional Description The AAT2863 is a highly integrated white LED backlight driver with four LDO regulators intended for applications in portable products such as cell phone handsets. A multimode 1x/1.5x/2x fractional charge pump provides LED backlight power from a 2.7V to 5.5V input voltage source. The white backlight LED current (brightness) is then controlled by dedicated programmable constant current sinks. Three 150mA LDO regulators and one 300mA LDO regulator are powered from the same input 12 PGND and produce regulated output voltages between 1.2V and 3.3V. Control of the LEDs and the LDO output voltages is through an industry standard I2C serial interface for easy programming and system control. LED Drivers The AAT2863 drives up to six backlight LEDs up to 30mA each. The LEDs are driven from a multimode fractional charge pump to insure that constant current is maintained for all possible LED forward voltage over the Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit entire battery voltage range. The charge pump automatically switches from 1x, to 1.5x, to 2x modes and back to maintain the LED current while minimizing power loss for high efficiency. The charge pump operates at the high 1MHz switching frequency allowing the use of small 1μF ceramic capacitors. Depending on the battery voltage and LED forward voltage, the charge pump drives the LEDs directly from the input voltage (1x or bypass mode) or steps up the input voltage by a factor of 1.5 (1.5x mode) or 2 (2x mode). The charge pump requires only two tiny 2.2μF ceramic capacitors, making a more compact solution than an inductor-based step-up converter solution. Each individual LED is driven by a current sink to GND, allowing individual current control with high accuracy over a wide range of input voltages and LED forward voltages while maintaining high efficiency. The charge pump is controlled by the voltage across the LED current sinks. When any one of the active backlight current sink voltages drops below 150mV, the charge pump will switch to the next higher mode (from 1x to 1.5x or from 1.5x to 2x mode) to maintain sufficient LED voltage for constant LED current. The AAT2863 continuously monitors the LED forward voltages and uses the input voltage to determine when to reduce the charge pump mode for better efficiency. There is also a 500mV mode-transition hysteresis that prevents the charge pump from oscillating between modes. LED Current Control LED backlight current is programmed and controlled through the I2C serial interface as is the fade in/out function. The constant current sinks can be set between 0.5 and 30mA in approximate 1mA steps. Refer to the constant current sink I2C serial interface programming table for detailed programmable current levels. PWM Controlled Dimming As an alternative to digital dimming via the I2C interface, the AAT2863 also provides an additional PWM dimming input pin, which allows the user to control BL1-BL6 or the main BL1-BL4 and sub BL5-BL6 independently. The PWM signal will modulate the LED current set by the I2C interface programming, making the AAT2863 compatible with various content adjusted backlight control (CABC) and ambient light sensor (ALS) auxiliary dimming control systems. The useable input PWM frequencies frequency range for this device is 600Hz to 100kHz. The constant current sinks are proportional to the duty cycle of the PWM signal. Fade In/Fade Out Function An LED current sink fade in/fade out function is provided for smooth turn on and turn off dimming of the backlight LEDs. This function is enabled and disabled through the I2C interface. Additionally, the LED Fade function can be applied to the main, sub or both backlights. There are four user selectable fade in/out times available. LDO Regulators The AAT2863 includes four low dropout (LDO) linear regulators. LDO regulator A has a 300mA output current capability and LDO regulators B, C and D can provide up to 150mA of load current. These regulators are powered from the battery and produce a fixed output voltages set through the I2C serial interface. The output voltage of any LDO regulator can be independently set to one of 16 output voltages between 1.2V and 3.3V. The LDO regulators can also be turned on/off through the I2C serial interface. The LDO regulators require only a small 2.2μF ceramic output capacitor for stability. If improved load transient response is required, larger-valued capacitors can be used without stability degradation. I2C Serial Interface The AAT2863 uses an I2C serial interface to set the LED currents, the LDO on/off and output voltage, as well as other housekeeping functions. The I2C interface takes input from a master device while the AAT2863 acts as a target to the master. The I2C protocol uses two open-drain inputs; SDA (serial data line) and SCL (serial clock line). Both inputs require an external pull up resistor, typically to the input voltage. The I2C protocol is bidirectional and allows target devices and masters to both read and write to the bus. The AAT2863 only supports the write protocol and therefore the Read/Write bit must always be set to “0”. Figure 1 shows the typical transmission protocol. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 13 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit start w msb Chip Address lsb ack msb Register Add lsb ack msb DATA lsb ack stop SCL SDA start AAT2863 Device Address Id = 60 h w ack Addr =00h ack Address = 00 h Data = 06h ack stop Figure 1: Typical I2C Timing Diagram. I2C Serial Interface Protocol START and STOP Conditions The I2C serial interface protocol is shown in Figure 1. Devices on the bus can be either master or target devices. Both master and target devices can both send and receive data over the bus, with the difference being that the master device controls all communication on the bus. The AAT2863 acts as a target device on the bus and is only capable of receiving data and does not transmit data over the bus. START and STOP conditions are always generated by the master. Prior to initiating a START, both the SDA and SCL pin are inactive and are pulled high through external pullup resistors. As shown in Figure 1, a START condition is when the master pulls the SDA line low and, after the start condition hold time (tHT_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. The I2C communications begins by the master making a START condition. Next the master transmits the 7-bit device address and a Read/Write bit. Each target device on the bus has a unique address. The AAT2863 device address is 60h. If the address transmitted by the master matches the device address, the target device transmits an Acknowledge (ACK) signal to indicate that it is ready to receive data. Since the AAT2863 only reads from the master, the Read/ Write bit must be set to “0”. Next, the master transmits the 8-bit register address, and the target device transmits an ACK to indicate that it received the register address. Next, the master transmits the 8-bit data word, and again the target device transmits an ACK indicating that it received the data. This process continues until the master is finished writing to the target device at which time the master generates a STOP condition. 14 A STOP condition, as shown in Figure 1, is when SCL changes from low to high followed after the STOP condition setup time (tSU_STO), by an SDA low-to-high transition. The master does not issue an ACK and releases SCL and SDA. Transferring Data Addresses and data are sent with the most significant bit first transmitted and the least significant bit transmitted 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit STOP START SDA SDA SCL SCL THD_STA TSU_STO Figure 2: I2C STOP and START Conditions; START: A High “1” to Low “0” Transition on the SDA Line While SCL is High “1” STOP: A Low “0” to High “1” Transition on the SDA Line While SCL is High “1”. SCL 1 2 3 4 5 6 7 MSB SDA A6 8 9 LSB A5 A4 A3 A2 A1 A0 R/W ACK Device Address Figure 3: I2C Address Bit Map; 7-bit Slave Address (A6-A0), 1-bit Read/Write (R/W), 1-bit Acknowledge (ACK). SCL 1 2 3 4 5 6 7 MSB SDA D7 8 9 LSB D6 D5 D4 D3 D2 D1 D0 ACK Register Address / Data Figure 4: I2C Register Address and Data Bit Map; 8-bit Data (D7-D0), 1-bit Acknowledge (ACK). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 15 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Application Information Backlight Control Registers The AAT2863 has five backlight registers: I2C Serial Programmed Registers • REG3 (I2C address 03h) controls the MAIN backlight. • REG4 (I2C address 04h) controls the SUB backlight. • REG5 (I2C address 05h) controls the auxiliary AUX1 backlight. • REG6 (I2C address 06h) controls the auxiliary AUX2 backlight. • REG7 (I2C address 07h) controls the MAIN, SUB fade in/out function. The AAT2863's I2C programming registers are listed in Table 1. There are eight registers: five for the backlight LED control, and three to control the four LDO regulators. All backlight channels can be easily configured in many different ways through the I2C inerface. The default assignment for the drivers is four backlight for main, two backlight for sub, and two extra that can be applied to main, sub, or auxiliary. All eight backlights can be driven to the same current level by writting the MEQS = 1 option in REG3. The MAIN and SUB backlights can be programmed independently to one of 32 levels described in Table 2. Table 3 describes the floor current per channel for the fade-in and fade-out functions. In fade-out sequence floor will be the final current that will continue to be present until the Main, Sub or Aux1,2 channels are disabled by writing MAIN_ON=0 to REG3, SUB_ON=0 to REG4, A1_ ON=0 to REG5, and/or A2_ON=0 to REG6. In fade-in sequence floor is the direct current all channels will be turned on by writing MAIN_ON=1 to REG3, SUB_ON=1 to REG4, A1_ON=1 to REG5, and/or A2_ON=1 to REG6. Register Number Hex Code Function Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 LDOA[3] LDOA[2] LDOA[1] LDOA[0] LDOB[3] LDOB[2] LDOB[1] LDOB[0] LDOC[2] LDOC[1] LDOC[0] LDOD[3] LDOD[2] LDOD[1] LDOD[0] REG0 00h LDO A & B Output Voltage Control REG1 01h LDO C & D Output Voltage Control LDOC[3] REG2 02h LDO EN CONTROL X X X X ENLDO_D ENLDO_C ENLDO_B ENLDO_A REG3 03h Backlight Current Control MAIN MEQS DISABLE FADE_MAIN MAIN_ON BLM[4] BLM[3] BLM[2] BLM[1] BLM[0] REG4 04h Backlight Current Control SUB X DISABLE FADE_SUB SUB_ON BLS[4] BLS[3] BLS[2] BLS[1] BLS[0] 05h Backlight Current Control AUX1 AUX1[1] AUX1[0] A1_ON BLA1[4] BLA1[3] BLA1[2] BLA1[1] BLA1[0] REG6 06h Backlight Current Control AUX2 AUX2[2] AUX2[0] A2_ON BLA2[4] BLA2[3] BLA2[2] BLA2[1] BLA2[0] REG7 07h Backlight Fade Control X X FADE_TIME[1] FADE_TIME[0] FADE_MAIN FADE_SUB FLOOR[1] FLOOR[0] REG5 Table 1: AAT2863 Configuration/Control Register Allocation (“X” = Reserved). 16 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Bit4 Bit3 Bit2 Bit1 Bit0 LED Current (mA) BLM[4] BLS[4] BLA1[4] BLA2[4] BLM[3] BLM[3] BLA1[3] BLA2[3] BLM[2] BLS[2] BLA1[2] BLA2[2] BLM[1] BLS[1] BLA1[1] BLA2[1] BLM[0] BLS[0] BLA1[0] BLA2[0] REG3 REG4 REG5 REG6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 30* 29.03 28.06 27.10 26.13 25.16 24.19 23.23 22.26 21.29 20.32 19.35 18.38 17.42 16.45 15.48 14.52 13.55 12.58 11.61 10.65 9.68 8.71 7.74 6.77 5.81 4.84 3.87 2.9 1.94 0.97 0.48 Table 2: Main/Sub/Aux Backlight LED Current - BLM/BLS/BLA [4:0]. Bit1 Bit 0 Fade Out Current Level (mA) FLOOR 1 FLOOR 0 REG7 0* 0 1 1 0* 1 0 1 0.48* 0.97 1.94 2.90 Table 3: Main/Sub LED Current Fade OUT Level Control. * Denotes default (power-on-reset) value. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 17 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Table 4 describes the final current per channel after the fade out sequence that will continue to be present until the MAN, SUB or AUX1,2 channels are disabled by writing to Bit 5 = 1 to REG3, REG4, REG5 or REG6. Fade OUT can be initiated only after Bit2 or Bit3 of REG7 have been programmed for fade in sequence first by writing FADE_ MAIN = 1 or FADE_SUB = 1. Fade IN / OUT Control REG7 Bit3 Bit 2 FADE_MAIN FADE_SUB MAIN SUB 0* 0 1 1 0* 1 0 1 Fade OUT Fade OUT Fade IN Fade IN Fade OUT Fade IN Fade OUT Fade IN Table 4: Main/Sub LED Current Fade IN/OUT Control. Table 5 describes Data Bit4 and Data Bit5 of REG7 control the duration of the fade-in/out function. The default timing is 850ms with options for 650ms and 425ms according to Table 5. The charge pump oscillator frequency is related to the fade-in/out timing as follows: For the 850ms fade-in/out timer, typical fOSC = 600kHz For the 650ms fade-in/out timer, typical fOSC = 800kHz For the 425ms fade-in/out timer, typical fOSC = 1.2MHz Bit5 Bit 4 FADE_TIME[1] FADE_TIME[0] Fade IN and OUT Timing (ms) 0* 0 1 1 0* 1 0 1 850* 650 425 850 Table 5: Main/Sub LED current Fade IN /OUT Timing Selection. Data Bit5 of REG3, REG4, REG4 and REG5 controls the turn on/off of the MAIN, SUB, AUX1 and AUX2 channels. Bit 5 Backlight Channel ON/OFF MAIN_ON SUB_ON AUX1_ON AUX1_ON REG3 REG4 REG5 REG6 0* 1 OFF ON Table 6: Main/Sub/Aux LED Current ON/OFF Control. Data Bit6 of REG3 and REG4 enable the fade control of the MAIN and SUB channels. Fade function can be explicitly disabled by writing DISABLE FADE_MAIN = 1 and DISABLE FADE_SUB = 1. Bit 6 Backlight Channel Fade Enable/Disable DISABLE FADE_MAIN DISABLE FADE_SUB REG3 REG4 0* 1 Enable Disable Table 7: Main/Sub Current Fade ON/OFF Control. Data Bit7 of REG3 programs all SUB channels as MAIN backlight. In this case if the MAIN fade function is enabled all MAIN and SUB channels will be faded simultaneously. Bit 7 MAIN Equal SUB MEQS REG3 0* 1 False True Table 8: Main/Sub Current Fade ON/OFF Control. *Denotes default (power-on-reset) value. 18 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Examples of Fade-Out Programming Main Only (Sub is OFF): Address Address Address Address Address 03h, 07h, 03h, 03h, 07h, Data Data Data Data Data 40: Disable fade 08: Fade-in is programmed 6F: Turn on directly to 15.48mA/ch 20: Re-enable fade 00: Fade-out to 0.48mA/ch Sub Only (Main is OFF): Address Address Address Address Address 04h, 07h, 04h, 04h, 07h, Data Data Data Data Data 40: Disable fade 04: Fade-in is programmed 6F: Turn on directly to 15.48mA/ch 2F: Enable fade 02: Fade-out to 1.94mA/ch Main and Sub (as shown in Figure 5): Address Address Address Address Address 03h, 07h, 03h, 03h, 07h, Data Data Data Data Data C0: 0C: 60: 20: 03: Disable fade Fade-in is programmed Turn on directly to 30mA/ch Enable fade Fade-out to 2.90mA/ch Examples of Fade-In/Out Programming Main Only (Sub is OFF): Address 03h, Data 20: Main backlight is turned on with 0.48mA/ch Address 07h, Data 08: Fade-in to 30mA/ch Address 07h, Data 03: Fade-out to 2.90mA/ch Sub Only (Main is OFF): Address Address Address Address 07h, 04h, 07h, 07h, Data Data Data Data 02: 2E: 04: 02: Fade-in is programmed to 1.94mA/ch Sub backlight is turned on with 1.94mA/ch Fade-in to 16.45mA/ch Fade-out to 1.94mA/ch Main and Sub (as shown in Figure 6): Address Address Address Address 07h, 03h, 07h, 07h, Data Data Data Data 01: Fade-in is programmed to 0.97mA/ch AA: Main and Sub backlight is turned on with 0.97mA/ch 0C: Fade-in to 20.32mA/ch 01: Fade-out to 0.97mA/ch Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 19 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Main and Sub Fade Out Only Max. 30mA /ch to 2.90mA/ch I2C Sequence: AAT2863 Chip Address 60h REG3 Address 03h, Data C0(0100 0000): Disable fade function REG7 Address 07h, Data 0C(0000 1100): Fade-in is programmed REG3 Address 03h, Data 60(0110 0000): Main/Sub is turned on with 30mA/ch Main/Sub Backlight 30mA/ch REG3 Address 03h, Data 20(0010 0000): Enable fade function REG7 Address 07h, Data 03(0000 0011): Fade-out is programmed to 2.90mA/ch Main/Sub Backlight 2.90mA/ch REG3 Address 03h Data 00(0000 0000 ) REG3 Address 03h, Data 20(0010 0000): Enable fade function REG3 Address 03h, Data 60(0110 0000): Main/Sub is turned on with 30mA/ch REG7 Address 07h, Data 08(0000 1000): Fade-in is programmed Main/Sub Backlight Off REG3 Address 03h, Data C0(0100 0000): Disable fade function REG7 Address 07h, Data 0C(0000 1100): Fade-in is programmed REG3 Address 03h, Data 60(0110 0000): Main/Sub is turned on with 30mA/ch Figure 5: Example of AAT2863 Fade Out Programming. Main and Sub Fade In/Out Max. 20.32mA/ch to 0.97mA/ch I2C Sequence: AAT2863 Chip Address 60h REG7 Address 07h, Data 01(0000 0001): Fade-in is programmed as 0.97mA/ch REG3 Address 03h, Data AA(1010 1010): Main/Sub backlight is turned on with 0.97mA/ch REG7 Address 07h, Data 0C(0000 1100): Fade-in programmed to 20.32mA/ch Main/Sub Backlight 20.32mA/ch REG7 Address 07h, Data 01(0000 0001): Fade-out is programmed to 0.97mA/ch REG7 Address 07h, Data 0C(0000 1100): Fade-in is programmed as 20.32mA/ch Main/Sub Backlight 0.97mA/ch REG3 Address 03h Data 80(1000 0000) REG7 Address 07h, Data 01(0000 0001): Fade-in is programmed as 0.97mA/ch REG3 Address 03h, Data AA(1010 1010): Main/Sub backlight is turned on with 0.97mA/ch REG7 Address 07h, Data 0C(0000 1100): Fade-in is programmed to 20.32mA/ch Main/Sub Backlight Off Figure 6: Example of AAT2863 Fade In/Out Programming. 20 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit LDO Control Registers The four LDO regulators each have three dedicated control registers: • REG0 (I2C address 00h) and REG1 (I2C address 01h) set the output voltages of LDOA/B/C/D to one of 16 pre-set values according to Table 9 and Table 10. •REG2 (I2C address 02h) controls turning on/off of LDOA/B/C/D regulators according to Table 11. Bit7 Bit6 Bit5 Bit4 LDO VOUT[A/C] (V) LDOA[3] LDOC[3] LDOA[2] LDOC[2] LDOA[1] LDOC[1] LDOA[0] LDOC[0] REG0 REG1 0* 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0* 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0* 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0* 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1.2* 1.3 1.5 1.6 1.8 2.0 2.2 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 Table 9: LDOA/LDOC Output Voltage Control Data. Bit3 Bit2 Bit1 Bit0 LDO VOUT[B/D] (V) LDOB[3] LDOD[3] LDOB[2] LDOD[2] LDOB[1] LDOD[1] LDOB[0] LDOD[0] REG0 REG1 0* 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0* 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0* 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0* 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1.2* 1.3 1.5 1.6 1.8 2.0 2.2 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 Table 10: LDOB/LDOD Output Voltage Control Data. *Denotes default (power-on-reset) value. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 21 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Bit3 Bit2 Bit1 Bit0 ENLDO_D ENLDO_C ENLDO_B ENLDO_A LDOD LDOC LDOB LDOA 0* 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0* 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0* 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0* 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON OFF OFF OFF OFF ON ON ON ON OFF OFF OFF OFF ON ON ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON Table 11: LDOA/LDOB/LDOC/LDOD ON/OFF Control Data. Auxiliary Backlight Selection LED Selection Each of the auxiliary drivers (AUX) can also be programmed to one of 32 levels described in Table 2. The auxiliary drivers can be driven independently, or combined with the main or sub by changing Bit6 and Bit7 in REG5 (I2C address 05h) and REG6 (I2C address 06h) according to Table 12. The auxiliary drivers can also be set to operate at twice their programmed current if Bit6=1 and Bit7=1 in REG5 and REG6. The AAT2863 is specifically intended for driving white LEDs. However, the device design will allow the AAT2863 to drive most types of LEDs with forward voltage specifications ranging from 2.0V to 4.7V. LED applications may include mixed arrangements for display backlighting, color (RGB) LEDs, infrared (IR) diodes and any other load needing a constant current source generated from a varying input voltage. Since the D1 to D8 constant current sinks are matched with negligible voltage dependence, the constant current channels will be matched regardless of the specific LED forward voltage (VF) levels. Bit7 Bit6 Auxiliary Channel Assignment AUX1[1] AUX2[1] AUX1[0] AUX2[0] REG5 REG6 0* 0 1 1 0* 1 0 1 SUB MAIN AUX AUX * 2 The low-dropout current sinks in the AAT2863 maximize performance and make it capable of driving LEDs with high forward voltages. Multiple channels can be combined to obtain a higher LED drive current without complication. Table 12: Auxiliary Channels Assignment. *Denotes default (power-on-reset) value. 22 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Device Switching Noise Performance 1x Mode Efficiency The AAT2863 operates at a fixed frequency of approximately 1MHz to control noise and limit harmonics that can interfere with the RF operation of cellular telephone handsets or other communication devices. Back-injected noise appearing on the input pin of the charge pump is 20mV peak-to-peak, typically ten times less than inductor-based DC/DC boost converter white LED backlight solutions. The AAT2863 soft-start feature prevents noise transient effects associated with in-rush currents during the start up of the charge pump circuit. The AAT2863's 1x mode is operational at all times and functions alone to enhance device power conversion efficiency when VIN is greater then the voltage across the load. When in 1x mode, the voltage conversion efficiency is defined as output power divided by input power: Power Efficiency and Device Evaluation Charge-pump efficiency discussion in the following sections accounts only for the efficiency of the charge pump section itself. Due to the unique circuit architecture and design of the AAT2863, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. Since the AAT2863 outputs are pure constant current sinks and typically drive individual loads, it is difficult to measure the output voltage for a given output (BL1 to BL8) to derive an overall output power measurement. For any given application, white LED forward voltage levels can differ, yet the output drive current will be maintained as a constant. This makes quantifying output power a difficult task when taken in the context of comparing to other white LED driver circuit topologies. A better way to quantify total device efficiency is to observe the total input power to the device for a given LED current drive level. The best White LED driver for a given application should be based on trade-offs of size, external component count, reliability, operating range and total energy usage...Not just “% efficiency”. The AAT2863 efficiency may be quantified under very specific conditions and is dependent upon the input voltage versus the output voltage seen across the loads applied to outputs D1 through D8 for a given constant current setting. Depending on the combination of VIN and voltages sensed at the current sinks, the device will operate in load switch mode. When any one of the voltages sensed at the current sinks nears dropout the device will operate in 1.5x or 2x charge pump mode. Each of these modes will yield different efficiency values. One should refer to the following two sections for explanations for each operational mode. η= POUT PIN The expression to define the ideal efficiency (η) can be rewritten as: η= POUT VOUT · IOUT VOUT = = PIN VIN · IOUT VIN -or- η(%) = 100 VOUT VIN 1.5x/2x Charge Pump Mode Efficiency The AAT2863 contains a fractional charge pump which will boost the input supply voltage in the event where VIN is less then the voltage required to supply the output. The efficiency (η) can be simply defined as a linear voltage regulator with an effective output voltage that is equal to one and a half or two times the input voltage. Efficiency (η) for an ideal 1.5x charge pump can typically be expressed as the output power divided by the input power. η= POUT PIN In addition, with an ideal 1.5x charge pump, the output current may be expressed as 2/3 of the input current. The expression to define the ideal efficiency (η) can be rewritten as: η= POUT VOUT · IOUT VOUT = = PIN VIN · 1.5IOUT 1.5VIN η(%) = 100 VOUT 1.5VIN Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 23 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit For a charge pump with an output of 5V and a nominal input of 3.5V, the theoretical efficiency is 95%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at 93%. These figures are in close agreement for output load conditions from 1mA to 100mA. Efficiency will decrease substantially as load current drops below 1mA or when level of VIN approaches VOUT. The same calculations apply for 2x mode where the output current then becomes 1/2 of the input current. Capacitor Selection Careful selection of the four external capacitors CIN, C1, C2, COUT is important because they will affect turn on time, output ripple and transient performance. Optimum performance will be obtained when low ESR (<100mΩ) ceramic capacitors are used. In general, low ESR may be defined as less than 100mΩ. A capacitor value of 1µF for all four capacitors is a good starting point when choosing capacitors. If the constant current sinks are only programmed for light current levels, then the capacitor size may be decreased. Capacitor Characteristics Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT2863. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lowest cost, has a smaller PCB footprint and is nonpolarized. Low ESR ceramic capacitors help to maximize charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Equivalent Series Resistance (ESR) ESR is an important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor, which is caused by the leads, internal connections, size or area, material composition and ambient temperature. Capacitor ESR is typically measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. 24 Ceramic Capacitor Materials Ceramic capacitors less than 0.1µF are typically made from NPO or COG materials. NPO and COG materials typically have tight tolerance and are stable over temperature. Larger capacitor values are typically composed of X7R, X5R, Z5U or Y5V dielectric materials. Large ceramic capacitors, typically greater than 2.2µF are often available in low cost Y5V and Z5U dielectrics, but capacitors greater than 1µF are typically not required for AAT2863 applications. Capacitor area is another contributor to ESR. Capacitors that are physically large will have a lower ESR when compared to an equivalent material smaller capacitor. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Evaluation Board User Interface The user interface for the AAT2863 evaluation board is provided by three buttons and three connection terminals. The board is operated by supplying external power and pressing individual buttons or button combinations. Table 14 indicates the function of each button or button combination. To power-on the evaluation board, connect a power supply or battery to the DC- and DC+ terminals. Close the board’s supply connection by positioning the J1 jumper to the ON position. A red LED indicates that power is applied. The evaluation board is made flexible so that the user can disconnect the data, clock and enable lines from the microcontroller and apply external signal sources by removing the jumpers from J2, J3 and/or J4. External enable signal must be applied to the ON pin of J4 terminal. External I2C clock SCL can be applied to J2 pin and data SDA to J3 pin. When applying external enable signals, consideration must be given to the voltage levels. The externally applied voltages should not exceed the supply voltage that is applied to the IN pins of the device (DC+). The LDO loads can be connected directly to the evaluation board. For adequate performance, be sure to connect the load between LDOA/LDOB/LDOC/LDOD and DC- as opposed to some other GND in the system. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Manufacturer AVX TDK Murata Taiyo Yuden Part Number Value Voltage 0603ZD105K 0603ZD225K C1608X5R1E105K C1608X5R1C225K C1608X5R1A475K GRM188R61C105K GRM188R61A225K LMK107BJ475KA 1uF 2.2μF 1μF 2.2μF 4.7μF 1μF 2.2μF 4.7μF 10 10 25 16 10 16 10 10 Temp. Co. Case X5R 0603 X5R 0603 X5R 0603 X5R 0603 Table 13: Surface Mount Capacitors. Button(s) Pushed SW1 (LDOs) SW2 (Main Backlight) SW3 (Sub/Aux Backlight) SW1+SW2 SW1+SW3 SW1+SW2+SW3 Description [Push/Release once] All LDOs will be turned on with default output voltage 1.2V. Every push release will increment output voltage according to datasheet table. [Push/Release once] Turning on the Main and Sub backlight LEDs with default current 30mA per channel. Every push release will increment output voltage according to datasheet table. [Push/Release once] Turning on only the Sub/Aux backlight LEDs with default current 30mA. Every push release will increment output voltage according to datasheet table. [Push/Release once] Turning on the fade-out sequence of the backlight LEDs with default current 30mA down to 0.5mA per channel. [Push/Release once] Turning on the fade-in sequence of the backlight LEDs with default current 0.5mA up to 30mA per channel. [Push/Release once] Reset all registers to default. Table 14: AAT2863 Evaluation Board User Interface Functionality. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 25 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit C2+ C1+ DC+ C1 1µF C1- J1 DC+ C1+ C1- 23 7 C5 4.7µF IN IN 20 AGND 6 PGND AGND 3 2 1 24 22 VIN DC- C4 4.7µF EN/SET V_MCU EN PWM SCL R8 10K R6 10K 5 19 4 SDA 3 R9 10K R10 10K PWM U1 AAT2863 18 VOUT 1 N/C EP SDA VIN C2 1µF C2C3 1µF EN PWM SCL SDA SCL 2 21 1 C2+ C2OUT BL1 BL2 BL3 BL4 BL5/AUX1 BL6/AUX2 12 13 14 15 17 16 LDOA LDOB LDOC LDOD 10 9 8 11 D1 D2 D3 D4 D5 D6 2 R24 R25 R26 0 0 0 D1 D4 1 2 LDOD C9 2.2µF U2 S1 SW1 SELECT SW2 DETAIL SW3 SEND 1 2 3 4 PIC12F675 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 8 7 6 5 D2 1 D3 2 1 2 1 2 2 LDOA LDOB LDOC C8 2.2µF D5 1 D6 C7 2.2µF C6 2.2µF GND VMCU R1 R2 R3 1k 1k 1k VOUT R21 R22 R23 0 0 0 C10 1µF R7 1k GND LED1 Red S2 S3 Figure 7: AAT2863 Evaluation Board Schematic. 26 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Figure 8: AAT2863 Evaluation Board Top Side Layout. Figure 9: AAT2863 Evaluation Board Layout Bottom Side Layout. Component Part Number Description Manufacturer U1 U2 SW1 – SW3 R1, R2, R3, R7 R6, R8, R9, R10 R21 – R26 C6, C7, C8, C9 C1, C2, C3, C10 C4, C5 D1-D4 D5, D6 LED1 J1 AAT2863IMK PIC12F675 PTS645TL50 Chip Resistor Chip Resistor Chip Resistor GRM188R71A225K GRM188R61A105K GRM188R61A475K LW M673 LS-SF687DBW71 CMD15-21SRC/TR8 PRPN401PAEN Backlight LED driver with 4 LDOs 8-bit CMOS, Flash-based μC; 8-pin PDIP package Switch Tact, SPST, 5mm 1kΩ, 1%, 1/4W; 0603 10kΩ, 1%, 1/4W; 0603 0Ω, 1%, 1/4W; 0603 2.2μF, 10V, X7R, 0603 1μF, 10V, X5R, 0603 4.7μF, 10V,X5R, 0603 Mini TOPLED White LED; SMT Power Top View White LED; SMT Red LED; 1206 Conn. Header, 2mm zip Skyworks Microchip ITT Industries Vishay Vishay Vishay Murata Murata Murata Osram Longsum Chicago Miniature Lamp Sullins Electronics Table 15: AAT2863 Evaluation Board Bill of Materials (BOM). Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 27 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Ordering Information Package Marking1 Part Number (Tape and Reel)2 TQFN34-24 F1XYY AAT2863IMK-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information TQFN34-243 3.000 ± 0.050 1.700 ± 0.050 Index Area 0.400 ± 0.050 R(5x) 2.700 ± 0.050 4.000 ± 0.050 0.210 ± 0.040 0.400 BSC Detail “A” Bottom View Detail “A” 0.750 ± 0.050 Top View 0 + 0.10 - 0.00 0.203 REF Side View All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3.The leadless package family, which includes QFN, TQFN, DFN, TDFN, and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. 28 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 DATA SHEET AAT2863 Backlight LED Driver and Multiple LDO Lighting Management Unit Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202507A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 2, 2012 29