DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash General Description Features The AAT1282 is a high-efficiency, high-current step-up converter capable of 2A maximum output current. It is an ideal power solution for LED photo flash applications in all single cell Li-ion powered products. VIN Range: 2.7V to 5.5V Dual Channel Output ▪ Up to 2A Regulated Output Current 1A per channel Integrated Fixed Input Current Limit ▪ 800mA* ▪ Suited for Super Capacitor Applications Up to 80% Efficiency with Small Magnetics 2MHz Switching Frequency Independent Flash Enable User-programmable Safety Timer Single Resistor Sets Flash and Movie-mode Current Two Wire, I2C Compliant Serial Interface: ▪ Fast, 400kHz Serial Transfer Rate ▪ 16 level Movie-mode Current ▪ Flash/Movie-mode ▪ Current Output Channel Control ▪ Safety Timer • True Load Disconnect • Supply Current in Shutdown: <1.0μA • TDFN33-14 Package The AAT1282 maintains output current regulation by switching the internal high-side and low-side switch transistors. The transistor switches are pulse-width modulated at a fixed frequency of 2MHz. The high switching frequency allows the use of a small inductor and output capacitor, making the AAT1282 ideally suited for small battery-powered applications. A high-capacity Super Capacitor on the secondary side of the step-up converter provides the high-peak flash LED current, thereby reducing the peak current demand from the Li-ion battery. To achieve this, the step-up converter features a fixed, input current limiter. An industry-standard I2C serial digital input is used to enable, disable and set the movie-mode current for each flash LED with up to 16 movie-mode settings. The AAT1282 also includes a separate Flash Enable input to initiate both the flash operation and the default timer which can be used either to terminate a flash event at the end of a user-programmed delay or as a safety feature. The maximum flash and movie-mode current is set by one external resistor where the ratio between Flash to Movie-mode current is set at approximately 7.3:1. One or two LEDs can be connected to the AAT1282, where in the case of two LEDs the output current is matched between each diode. The ratio of maximum flash current to moviemode current can also be adjusted via the I2C control. Applications • • • • • Camcorder Video Light (Torch Light) Camera Phones/Smartphones Digital Still Cameras (DSC) LED Photo Flash Light (Strobe Light) Mobile Handsets The AAT1282 contains a thermal management system to protect the device in the event of an output short-circuit condition. Built-in circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 1.0μA. The AAT1282 is available in a Pb-free, thermallyenhanced 14-pin 3 x 3mm TDFN package. * Contact Sales for alternative current limits. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 1 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Typical Application Circuit L1 1μH SW IN Flash LEDs OUT CIN 2.2μF VBAT COUT 2.2μF I2C Interface RSCB1 30kΩ AAT1282 Flash Enable FLEN Enable EN FLOUTA SDA SDA SCL SCL FLOUTB CT RSCB2 30kΩ CT 47nF RSET AGND PGND FLGND Super Capacitor RSET 80.6kΩ Pin Descriptions Pin # Symbol Function 1 CT I 2 EN I 3 FLEN I 4 AGND P 5 IN PI 6 SW O 7 PGND P 8 OUT O 9 10 SCL SDA I I 11 FLOUTB O 12 FLGND P 13 FLOUTA O 14 RSET I EP 2 Description Flash timer control input. Connect a capacitor between CT and AGND to set default ON time for the flash output. A 47nF ceramic capacitor defaults the flash timer to 600ms. Alternative timeout periods can be programmed via I2C. To disable the flash timer, connect CT to AGND. Enable control input, an active HIGH asserted input. EN must be strobed low-to-high to enable the AAT1282 to accept I2C programming instructions. Flash enable pin. A low-to-high transition on the FLEN pin initiates a flash pulse and starts the flash timer. Analog ground pin. Connect AGND to PGND and FLGND at a single point as close to the AAT1282 as possible. Power input. Connect IN to the input power supply voltage. Connect a 2.2μF or larger ceramic capacitor from IN to PGND as close as possible to the AAT1282. Step-up converter switching node. Connect a 1μH inductor between SW and IN. Power ground pin. Connect PGND to AGND and FLGND at a single point as close to the AAT1282 as possible. Power output of the step-up converter. Connect a 2.2μF or larger ceramic capacitor from OUT to PGND as close as possible to the AAT1282. Connect OUT to the super capacitor and the anode(s) of the Flash LED(s). I2C Interface: Serial Control Line. I2C Interface: Serial Data/Address. Flash Output B. Connect cathode of Flash LEDB to FLOUTB. For a single flash LED, connect FLOUTB and FLOUTA together. For two flash LEDs, each output will conduct 50% of the total flash output current. Can be turned off or on via I2C. Flash ground pin. Connect FLGND to PGND and AGND at a single point as close to the AAT1282 as possible. Flash Output A. Connect cathode of Flash LED A to FLOUTA. For a single flash LED, connect FLOUTA and FLOUTB together. For two flash LEDs, each output will conduct 50% of the total flash output current. Can be turned off or on via I2C. Flash current setting input. A 80.6kΩ resistor from RSET to AGND sets the maximum flash current available at FLOUTA and FLOUTB to 2000mA. Each FLOUTA and FLOUTB channel will conduct 50% of the maximum programmed current (1000mA). The AAT1282’s flash-to-movie-mode default ratio is a fixed at 7.3 but can be adjusted via I2C. Exposed paddle (bottom); Connect EP to PGND as close as possible to the AAT1282. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Pin Configurations TDFN33-14 (Top View) CT EN FLEN AGND IN SW PGND 1 14 2 13 3 4 12 EP 11 5 10 6 9 7 8 RSET FLOUTA FLGND FLOUTB SDA SCL OUT Absolute Maximum Ratings1 TA = 25OC unless otherwise noted. Symbol VIN, VSW, VOUT VRSET, VEN, VFLEN, VSCL, VSDA, VCT, VFLOUTA, VFLOUTB IOUT Description IN, SW, OUT to GND or PGND RSET, EN, FLEN, SCL, SDA, CT, FLOUTA, FLOUTB to GND, PGND, or FLGND FLOUT1 and FLOUT22 Value Units -0.3 to 6.0 V VIN + 0.3 2200 mA Value Units Thermal Information3 Symbol ΘJA PD TJ TLEAD Description Thermal Resistance Maximum Power Dissipation Maximum Junction Operating Temperature Maximum Soldering Temperature (at leads, 10 sec) 50 2 -40 to +150 300 O C/W W O 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. Based on long-term current density limitation. 3. Mounted on an FR4 circuit board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 3 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Electrical Characteristics1 VIN = 3.6V; CIN = 2.2μF; COUT = 2.2μF; L = 1μH; RSET = 80.6kΩ; TA = -40°C to +85, unless otherwise noted. Typical values are TA = 25°C. Symbol Description Conditions Power Supply VIN Input Voltage Range IIN(Q) ISHDN(MAX) IFL(TOTAL) IFL(MATCH) Supply Current Shutdown Current Total Output Current, Flash Mode FLOUTA and FLOUTB Current Matching RSET = 80.6k; Movie-mode Current Set = 100%; FLOUTA + FLOUTB Switching Frequency TA = 25°C tDEFAULT Default ON time TSD Thermal Shutdown Threshold Thermal Shutdown Hysteresis TSD(HYS) I2C Control – SDA, SCL VIL Input Threshold Low VIH Input Threshold High II Input Current VOL Output Logic Low (SDA) 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 SDA Data Setup Time tSU_DAT tHD_DAT SDA Data Hold Time tSU_STO Setup time for STOP Condition Bus Free Time between STOP and tBUF START Condition EN, FLEN Logic Control VEN(L), EN, FLEN Input Low Threshold VFLEN(L) VEN(H), EN, FLEN Input High Threshold VFLEN(H) tFLEN_OND FLEN ON Delay Time tFLEN_OFFD FLEN OFF Delay Time CT = 47nF fOSC Typ 2.7 EN = IN; FLEN = AGND; Set load = 2A; RSET = 80.6k EN = FLEN = AGND RSET = 80.6k; FLOUTA + FLOUTB Total Output Current, Movie-mode IMM(TOTAL) Min 1800 1.5 Max 5.5 V 0.57 1 mA 2000 1.0 2200 μA mA 10 % 274 mA 2.0 2.5 600 140 15 MHz ms C C 0.4 0.6 V V μA V kHz μs μs μs μs ns μs μs 1.3 μs 1.4 -1.0 1.0 0.4 400 IPULLUP = 3mA 0 1.3 0.6 0.6 0.6 100 0.9 0.4 1.4 EN = AGND EN = AGND Units V V 40 10 μs μs 1. The AAT1282 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. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash 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 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 5 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Typical Characteristics Boost Converter Efficiency (POUT/PIN) without SuperCap Flash Mode LED Current Matching vs. Temperature (L = 1µH) (IFLOUTX = 1A/Channel; VIN = 3.6V; SuperCap [5.5V, 0.55F]) LED Current Matching (%) 100 Efficiency (%) 95 90 85 80 75 274mA 200mA 142mA 100mA 70 65 60 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 4 3.5 3 2.5 2 1.5 1 0.5 0 -40 -15 10 Flash Mode LED Current (mA) Input Voltage (V) 85 Flash Mode LED Current vs. Temperature Flash Turn On Characteristic (IFLOUTX = 1A/Ch; VIN = 3.6V; SuperCap [5.5V, 0.55F]) 1200 1000 800 VOUT (2V/div) 4V VSW (5V/div) 0V 600 400 ILED = IFLOUTX (1A/div) 0A VFLOUTX (5V/div) 0V 200 0 -40 -15 10 35 60 85 Time (50ms/div) Movie Mode LED Current Accuracy Movie Mode LED Current Matching (IFLOUTX = 100mA/Channel; L = 1µH) (IFLOUTX = 100mA/Channel; L = 1µH) 8 1.8 6 1.6 4 1.4 Matching (%) Output Current Accuracy (%) 60 (IFLOUTX = 1A/Channel; VIN = 3.6V; SuperCap [5.5V, 0.55F]) Temperature (°C) 2 0 -2 -4 -6 -8 2.7 1.2 1 0.8 0.6 0.4 3.1 3.5 3.9 4.3 Input Voltage (V) 6 35 Temperature (°C) 4.7 5.1 5.5 0.2 2.7 3.1 3.5 3.9 4.3 4.7 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 5.1 5.5 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Typical Characteristics Movie Mode Ripple Movie Mode Transition Characteristic (VOUT = 5.5V; VIN = 3.6V; IFLOUTX = 137mA/Ch; L = 1µH) (IFLOUTX = 137mA/Ch to 50mA/Ch; SuperCap [5.5V, 0.55F]) VOUT (AC Coupled) (50mV/div) VIN (AC Coupled) (50mV/div) ISW (500mA/div) SDA Pin (5V/div) 0V VOUT (5V/div) 0V VFLOUTX (AC Coupled) (100mV/div) 200mA IFLOUTX (AC Coupled) (10mA/div) IFLOUTX (100mA/div) 0A Time (200ns/div) Time (200µs/div) Movie Mode Turn On Characteristic Shutdown Current vs. Input Voltage (IFLOUTX = 137mA/Ch; VIN = 3.6V; SuperCap [5.5V, 0.55F]) 0V VOUT (5V/div) 0V Shutdown Current (µA) SDA Pin (5V/div) 0A ISW (1A/div) IFLOUTX (100mA/div) (VEN = VFLEN = GND = AGND = FLGND) 0.03 0A -40°C 25°C 0.025 0.02 0.015 0.01 0.005 0 2.7 3.1 3.5 Time (100µs/div) 4.7 5.1 Flash Timeout vs. CT Capacitor (VIN = 3.6V; CT = 47nF; IFLOUTX = 1A/Ch) (IFLOUTX = 1A/Ch; SuperCap [5.5V, 0.55F]) 5.5 800 Flash Timeout (ms) 900 Flash Timeout (ms) 4.3 Flash Timeout vs. Temperature 1000 800 700 600 500 400 300 200 -40 3.9 Input Voltage (V) 700 600 500 400 300 200 100 0 -15 10 35 Temperature (°C) 60 85 0 5 10 15 20 25 30 35 40 45 50 CT Capacitor (nF) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 7 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Typical Characteristics Supply Current vs. Input Voltage Enabling and SuperCap Charging Characteristic (VEN = 3.6V; VFLEN = FLGND) (VIN = 3.6V; SuperCap [5.5V, 0.55F]) Supply Current (µA) 800 700 600 500 400 300 200 -40°C 25°C 85°C 100 0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 VIN (2V/div) 3.6V VOUT (5V/div) 0V ISW (1A/div) 0A IIN (1A/div) 0A 5.5 Input Voltage (V) Time (1s/div) EN, FLEN High Threshold Voltage vs. Input Voltage (L = 1µH) 1.4 3 1.3 2.5 VEN(H), VFLEN(H) (V) Switching Frequency (MHz) Movie Mode Switching Frequency vs. Input Voltage 85C 2 -40C 1.5 25C 1 -40°C 25°C 85°C 0.5 0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 1.2 1.1 1.0 0.9 0.8 0.7 -40°C 25°C 85°C 0.6 0.5 5.5 Input Voltage (V) 0.4 2.7 3.1 3.5 3.9 4.3 4.7 Input Voltage (V) EN, FLEN Low Threshold Voltage vs. Input Voltage 1.4 -40°C 25°C 85°C VEN(L), VFLEN(L) (V) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Input Voltage (V) 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 5.1 5.5 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Functional Block Diagram SW OUT IN PGND FLOUTA FLOUTB EN FLEN SCL SDA Control RSET CT AGND PGND Functional Description The AAT1282 is a high power, 2A Flash LED driver. This device utilizes a highly efficient inductive step-up converter to achieve to desired output voltage (Super Capacitor voltage, 5.5V). The current of two output channels are regulated evenly which is discharged from the output Super Capacitor, mainly for camera flash applications. The maximum flash current is set by an external resistor, RSET, which also sets the maximum movie-mode current. The maximum movie-mode current is equal to the maximum programmed flash current reduced by the flash-tomovie-mode ratio with the default value set to 1:7.3. A flash pulse is initiated by strobing the FLEN input pin lowto-high, which initiates a flash pulse and also starts the internal safety timer. The maximum flash time is determined by an external timing capacitor connected to the CT pin. The flash duration can be set from 50ms up to a maximum of 1s. The flash timer will terminate the flash current regardless of the status of the FLEN pin. This can be either used as a simple flash timing pulse or can be used as a safety timer in the event of a control logic malfunction to prevent the LEDs from over-heating. If the safety timer is not needed in the application, it can be disabled by connecting the CT pin directly to AGND. Further adjustments to the timeout period can be obtained by programming through the I2C interface. FLGND When the AAT1282 is enabled, the step-up convertor operates at 2MHz switching and charged up the Super Capacitor to 5.5V in seconds. As soon as the Super Capacitor reaches 5.5V, the AAT1282 automatically changes to light load mode operation to maintain output regulation at light load or no load condition. This is discontinuous mode operation, and is normal behavior for a switching regulator. At this point, the LEDs are ready to be flashed. During the flash, the boost engine is shut down, and the two LEDs connected to its corresponding current channel (FLOUTA or FLOUTB) share the output current supplied by the Super Capacitor equally. (The duration of the flash will be further discussed in the Applications Information section of this datasheet.) In applications where only one LED is connected to either FLOUTA or FLOUTB, the unused current channel must be directly connected to OUT, thereby disabling that channel. For the single ultra bright LED application which requires doubling the flash current, the two current channels can be connected together which allow this ultra bright single LED getting the full output current (please check with the LED specification from LED suppliers). During the movie-mode operation, the safety timer is disabled. Enabling each output channel (FLOUTA and FLOUTB can be enabled or disabled individually or together) and programming the flash-to-movie-mode Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 9 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash current ratio can be set using the AAT1282’s I2C-compliant interface. The movie-mode current level can be adjusted in 16 steps using a logarithmic scale. The maximum flash safety timer can be externally set by CT, and the timer can be programmed from the maximum value in 16 linear steps through I2C-compliant interface. The FLEN signal takes priority over movie-mode operation. Lastly, the EN pin must be toggled low-to-high to enable the AAT1282 to accept any I2C programming instructions. Over-Temperature Protection Thermal protection disables the AAT1282 when internal power dissipation becomes excessive, as it disables both MOSFETs. The junction over-temperature threshold is 140°C with 15°C of temperature hysteresis. The output voltage automatically recovers when the over-temperature fault condition is removed. Over-Voltage Protection (Open LED, Open Super Capacitor) The AAT1282’s output voltage is limited by internal overvoltage protection circuitry, which prevents damage to the AAT1282 from an open super capacitor condition. During this condition, the output voltage rises and reaches 5.5V (typical), preventing the output voltage from rising higher. Once the open super capacitor condition is removed, charging of the super capacitor will resume. The controller will return to normal operation and maintain an average output voltage. If one LED channel accidently becomes open, the remaining LED channel of AAT1282 will still work, but may not be regulated to the desired current. Device Start up and Shutdown The AAT1282 is put into operation when EN is set high. It is put into a shutdown mode when EN is set to GND. In the shutdown mode, AAT1282 draws less than 1μA from the battery. All data and register contents are cleared (reset to the default value) during shutdown. During start up of this LED driver, the peak current is limited in order to avoid high peak current drawn from the battery. Operating Diagram ENABLE 5.5V VOUT = SuperCap voltage FLASH ENABLE t CT LED CURRENT Turn on LEDs in Movie Mode controlled by I2C interface 10 Flash times out Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Applications Information LED Selection The AAT1282 is specifically designed to drive ultra bright flash LEDs with typical forward voltage of 2.5V to 4.0V within 1A forward current. Since the FLOUTA and FLOUTB pins have internal current-mirror circuitry which matches both channels with tight accuracy up to 1A per channel; the LED-to-LED brightness will be matched regardless of the individual LED forward voltage (VF). Circuit designers should consult the LED supplier for LED specifications. Flash Mode LED Current The LED current is controlled by the RSET resistor. For maximum accuracy, a 1% tolerance resistor is recommended. FLOUTA and FLOUTB can be programmed up to a maximum total flash current of 2000mA or up to 1000mA per channel. FLOUTA and FLOUTB output current is matched across the programming range. A flash event is initiated by asserting the FLEN pin. A flash event is automatically terminated when FLEN is disabled or if the safety timer terminates before the FLEN pin is disabled. IMOVIE-MODE[A/B] = IFLOUT[A/B](MAX) 1000mA = = 137mA 7.3 7.3 To change the configuration or the settings, the AAT1282 can be programmed via the I2C interface. Triggering the FLEN low to high will enable a flash event with the maximum flash current set by the RSET resistor or with programmed flash current set via the I2C interface. Concurrently, the flash timer is also initiated. All data and register contents are cleared (reset to the default value) after each flash event. Flash Safety Timeout The AAT1282 includes a timer circuit that enables the flash current for a programmed period of time. This feature eliminates the need for an external, housekeeping baseband controller to contain a safety delay routine. It also serves as a protection feature to minimize thermal issues with the flash LEDs in the event an external controller’s flash software routine experiences hang-up or freeze. The flash safety timeout, T can be calculated by the following equation: T = 13.5s/μF · CT The maximum flash current in each FLOUTA and FLOUTB is set by the RSET resistor and can be calculated using the following equation: Where T is in seconds and CT is the capacitance of the timer capacitor in μF. 81kΩ · A 81kΩ · A = = ~1000mA per channel RSET 80.6kΩ For example, using a 74nF capacitor for CT sets the flash timeout to: To prevent excessive power dissipation during higher flash current operation, RSET values smaller than 80.6kΩ are not recommended. Since the super capacitor is the only source for the LED flash current, the duration of the flash is determined by the energy stored in the super capacitor. During flash, the energy of the super capacitor is discharged; at the same time, the voltage of the super capacitor is decreased. Once the super capacitor voltage is lowered to a level (the minimum sink pin voltage + the LED forward voltage), the flash is ended. With a fully charged super capacitor in place, the flash for two 1A LEDs can last for more than 500ms. Movie Mode LED Current The maximum movie-mode current level is set by the maximum, programmed flash current reduced by the programmed flash-to-movie-mode ratio in which the default value is 7.3: Flash Safety Timeout = 13.5s/μF · 0.074μF = 1s The relationship between the flash safety timeout and the capacitance of the timer capacitor is illustrated in Figure 1. Flash Safety Timeout (ms) IFLOUTA = IFLOUTB = 1200 1000 800 600 400 200 0 0 10 20 30 40 50 60 70 80 90 CT Capacitor (nF) Figure 1: Flash Safety Timeout vs. Timer Capacitor. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 11 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash I2C Serial Interface I2C Address Bit Map The AAT1282 is fully compliant with the industry-standard I2C interface. The I2C two-wire communications bus consists of SDA and SCL lines. SDA provides data, while SCL provides clock synchronization with speed up to 400kHz. SDA data transfers device address followed by a register address and data bits sequence. When using the I2C interface, EN is pulled high to enable the device or low to disable the device. The I2C serial interface requires a master to initiate all the communications with target devices. The AAT1282 is a target device and only supports the write protocol. The AAT1282 is manufactured with a target device address of 0x37 (Hex). See Figure 2 for the I2C interface diagram. Figure 4 illustrates the address bit transfer. The 7-bit address is transferred with the Most Significant Bit (MSB) first and is valid when SCL is high. This is followed by the R/W bit in the Least Significant Bit (LSB) location. The R/W bit on the eighth bit determines the direction of the transfer (a '1' for read or a '0' for write). The AAT1282 is a write-only device and the R/W bit must be set low. The Acknowledge bit (ACK) is set to low by the AAT1282 to acknowledge receipt of the address. I2C START and STOP Conditions START and STOP conditions are always generated by the master. Prior to initiating a START, both the SDA and SCL pins are in idle mode (idle mode is when there is no activity on the bus and SDA and SCL are pulled high by the external pull-up resistors). A START condition occurs when the master strobes the SDA line low and after a short period strobes the SCL line low. A START condition acts as a signal to all ICs that transmission activity is about to occur on the I2C bus. A STOP condition, as shown in Figure 2, is when master releases the bus and SCL changes from low to high followed by SDA low-tohigh transition. The master does not issue an ACKNOWLEDGE and releases the SCL and SDA pins. I2C Register Address/Data Bit Map Figure 5 illustrates the Register Address or the serial data bit transfer. The 8-bit data is always transferred most significant bit first and is valid when SCL is high. The Acknowledge bit (ACK) is set low by the AAT1282 to acknowledge receipt of the register address or the data. I2C Acknowledge Bit (ACK) The Acknowledge bit is the ninth bit of each transfer on the SDA line. It is used to send back a confirmation to the master that the data has been received properly by the target device. For each ACK to take place, the master must first release the SDA line, and then the target device will pull the SDA line low, as shown in Figures 1, 4, and 5. ack from slave start MSB Device Address LSB w ack ack from slave MSB Register Address LSB ack MSB ack from slave DATA LSB ack stop SCL SDA start AAT1282 Device Address = 37h w ack Register Address = 00h ack Data = 06h ack Figure 2: I2C Interface Diagram. 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 stop DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash STOP START SDA SDA SCL SCL Figure 3: 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 4: 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 5: 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 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 13 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Device Register Information To program the register through the I2C interface, the master needs to send the AAT1282’s device address, 0x37 (Hex), first, and then sends an 8-bit register address and 8-bit data. The AAT1282 has two registers, Register 0 and Register 1. If no instruction is written to the register, the default value is applied. Register 0 (REG0), Register Address: 00h Bits [7:4] Program the movie-mode current with 16 different percentage levels. Bits [3:0] Program the flash safety timeout with 16 different fractions from the hardware configuration, CT. MSB 7 LSB 6 5 4 3 2 1 0 Flash Safety Timeout 0000 = 16/16 (default) 0001 = 15/16 0010 = 14/16 0011 = 13/16 0100 = 12/16 0101 = 11/16 0110 = 10/16 0111 = 9/16 1000 = 8/16 1001 = 7/16 1010 = 6/16 1011 = 5/16 1100 = 4/16 1101 = 3/16 1110 = 2/16 1111 = 1/16 Movie Mode Current 0000 = 100% (default) 0001 = 89.1% 0010 = 79.4% 0011 = 70.8% 0100 = 63.1% 0101 = 56.2% 0110 = 50.1% 0111 = 44.7% 1000 = 39.8% 1001 = 35.5% 1010 = 31.6% 1011 = 28.2% 1100 = 25.1% 1101 = 22.4% 1110 = 20% 1111 = 0% Figure 6: AAT1282 Register 0 Programming. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Register 1 (REG1); Register Address: 01h Bits [5:4] Program the FLOUTA and FLOUTB with four ON/OFF configurations. Bits [3:0] Program the flash-to-movie mode ratio with 16 different fractions from the hardware configuration, RSET. MSB X LSB X 5 4 3 2 1 0 Flash-to-Movie Mode Ratio 0000 = 1/2 0001 = 1/3.8 0010 = 1/5.5 0011 = 1/7.3 (default) 0100 = 1/8.9 0101 = 1/10.5 0110 = 1/12.2 0111 = 1/13.8 1000 = 1/14.9 1001 = 1/16.5 1010 = 1/18 1011 = 1/19.6 1100 = 1/21.1 1101 = 1/22.6 1110 = 1/24 1111 = OFF 00 01 10 11 FLOUTA FLOUTB OFF OFF (default) OFF* ON ON OFF* ON ON *with 2-3mA standby current Figure 7: AAT1282 Register 1 Programming. Selecting the Boost Inductor The AAT1282 controller utilizes PWM control and the switching frequency is fixed. To maintain 2MHz maximum switching frequency and stable operation, a 1μH inductor is recommended. Manufacturer’s specifications list both the inductor DC current rating, which is a thermal limitation, and peak inductor current rating, which is determined by the saturation characteristics. Measurements at full load and high ambient temperature should be performed to ensure that the inductor does not saturate or exhibit excessive temperature rise. The inductor (L) is selected to avoid saturation at minimum input voltage and maximum output load conditions. Worst-case peak current occurs at minimum input voltage (maximum duty cycle) and maximum load. Bench measurements are recommended to confirm actual IPEAK and to ensure that the inductor does not saturate at maximum LED current and minimum input supply voltage. The RMS current flowing through the boost inductor is equal to the DC plus AC ripple components. Under worst case RMS conditions, the current waveform is critically continuous. The resulting RMS calculation yields worst case inductor loss. The RMS current value should be compared against the inductor manufacturer’s temperature rise, or thermal derating guidelines: IRMS = IPEAK 3 For a given inductor type, smaller inductor size leads to an increase in DCR winding resistance and, in most cases, increased thermal impedance. Winding resistance degrades boost converter efficiency and increases the inductor’s operating temperature: PLOSS(INDUCTOR) = I2RMS · DCR Selecting the Boost Capacitors In general, it is good design practice to place a decoupling capacitor (input capacitor) between the IN and GND pins. An input capacitor in the range of 2.2μF to 10μF is Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 15 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash recommended. A larger input capacitor in this application may be required for stability, transient response, and/or ripple performance. The high output ripple inherent in the boost converter necessitates the use of low impedance output filtering. Multi-layer ceramic (MLC) capacitors provide small size and adequate capacitance, low parasitic equivalent series resistance (ESR) and equivalent series inductance (ESL), and are well suited for use with the AAT1282 boost regulator. MLC capacitors of type X7R or X5R are recommended to ensure good capacitance stability over the full operating temperature range. The output capacitor is selected to maintain the output load without significant voltage droop (∆VOUT) during the power switch ON interval. A ceramic output capacitor 2.2μF is recommended (see Table 2). Typically, 6.3V or 10V rated capacitors are required for this flash LED boost output. Ceramic capacitors selected as small as 0603 are available which meet these requirements. MLC capacitors exhibit significant capacitance reduction with applied voltage. Output ripple measurements should confirm that output voltage droop and operating stability are within acceptable limits. Voltage derating can minimize this factor, but results may vary with package size and among specific manufacturers. To maintain stable operation at full load, the output capacitor should be selected to maintain ∆VOUT between 100mV and 200mV. The boost converter input current flows during both ON and OFF switching intervals. The input ripple current is less than the output ripple and, as a result, less input capacitance is required. of 5.5V and 500mF DC capacitance for the best results in AAT1282 camera flash applications. Low profile, low impedance (low ESR below 110mΩ), and a wide environmental operating range (-40°C to +85°C) should also be considered when selecting a capacitor for portable power management systems. Please contact the super capacitor manufacturer(s) (such as TDK, CAP-XX or Murata) for detailed information. PCB Layout Guidelines Boost converter performance can be adversely affected by poor layout. Possible impact includes high input and output voltage ripple, poor EMI performance, and reduced operating efficiency. Every attempt should be made to optimize the layout in order to minimize parasitic PCB effects (stray resistance, capacitance, and inductance) and EMI coupling from the high frequency SW node. A suggested PCB layout for the AAT1282 High Power 2A Flash LED driver is shown in Figures 8 through 11. The following PCB layout guidelines should be considered: 1. 2. 3. Super Capacitor The AAT1282 requires a super capacitor connected to the output and the LEDs. After the super capacitor is fully charged, sufficient energy is stored and ready to provide large power surges such as flash peak current. When selecting a super capacitor, it is highly recommended to select a capacitor with an operating voltage 16 4. 5. Minimize the distance from capacitor CIN and COUT’s negative terminals to the PGND pins. This is especially true with output capacitor COUT, which conducts high ripple current from the output to the PGND pins. Minimize the distance between IN and switching pin SW; minimize the size of the PCB area connected to the SW pin. Maintain a ground plane and connect to the IC PGND pin(s) as well as the PGND connections of CIN and COUT. Consider additional PCB exposed area for the flash LEDs to maximize heatsinking capability. This may be necessary when using high current application and long flash duration application. Connect the exposed paddle (bottom of the die) to either PGND or GND. Connect AGND, FLGND to GND as close as possible to the package. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Manufacturer Part Number Inductance (μH) Saturated Rated Current (A) DCR (mΩ) Cooper Bussmann Cooper Bussmann Cooper Bussmann Sumida Coilcraft TDK SD3812-1R0-R SDH3812-1R0-R SD10-1R0-R CDH38D11/S LPS4012-102NLC VLS4012T-1RON1R6 1 1 1 1 1 1 2.69 3 2.25 2.69 2.5 2.5 48 45 44.8 48 60 60 Size (mm) LxWxH 4.0 3.8 5.2 4.0 4.1 4.0 x x x x x x 4.0 3.8 5.2 4.0 4.1 4.0 x x x x x x Type 1.2 1.2 1.0 1.2 1.2 1.2 Shielded Shielded Shielded Shielded Shielded Shielded Drum Drum Drum Drum Drum Drum Core Core Core Core Core Core Table 1: Typical Suggested Surface Mount Inductors. Manufacturer Part Number Capacitance (μF) Voltage Rating (V) Temp Co. Case Size Murata Murata Murata Murata TDK Murata TDK Murata GRM185R60J225KE26 GRM188R71A225KE15 GRM21BR70J225KA01 GRM21BR71A225KA01 C1608X5R1A225K GRM219R61A475KE19 C1005X7R1C473K GRM21BR71A106KE51 2.2 2.2 2.2 2.2 2.2 0.047 0.047 10 6.3 10 6.3 10 10 10 16 10 X5R X7R X7R X7R X5R X5R X7R X7R 0603 0603 0805 0805 0603 0805 0402 0805 Table 2: Typical Suggested Surface Mount Capacitors. Manufacturer Part Number Capacitance (F) Voltage Rating (V) ESR (mΩ) Size (mm) LxWxH TDK CAP-XX Murata EDLC262020-501-2F50 HA230 ** 0.5 0.425 0.425 5.6 5.5 5.5 50 110 110 20 x 20 x 2.6 20 x 18 x 3.2 20 x 18 x 3.2 Table 3: Typical Suggested Super Capacitors. SCL VOUT SDA FLEN R2 VCC JP1 0 JP2 0 FL 1 FL2 10k Enable SC1 0.55F U1 1 2 3 JP3 4 5 6 L1 C1 2.2μF 1μH C3 47nF 7 CT EN FLEN AGND IN SW PGND RSET FLA FLGND FLB SDA SCL OUT R12 30.1k 3 14 13 12 11 R13 30.1k 10 9 + 1 Bal Gnd 2 8 AAT1282 TDFN33-14 R1 80.6k C2 2.2μF Figure 8: AAT1282 DB1 Microcontroller Evaluation Board Schematic. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 17 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash DC - DC + VCC JP7 MCU JP8 0 R5 R6 R7 10K 10K 10K 1 Movie Mode Control Safety Timer A / B Control 0 0 0 2 SW 1 3 21 43 5 4 SW 2 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 R8 10 k C4 1μF U2 8 FLEN 7 6 5 R4 330 PIC12F675 0 R3 330 21 43 5 LED 1 RED 21 43 5 LED 2 GRN SW 3 SW4 JP4 R9 100k 21 43 5 R10 10k R11 10k SCL JP5 FLEN SDA JP6 SCL SDA Figure 9: AAT1282 DB1 Microcontroller Evaluation Board MCU Section Schematic. Figure 10: AAT1282 DB1 Microcontroller Evaluation Board Top Side Layout. 18 Figure 11: AAT1282 DB1 Microcontroller Evaluation Board Bottom Side Layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash HEADER ViO SCL FLEN NC NC 1 3 5 7 9 Gnd SDA NC NC NC 2 4 6 8 10 Header 5X2 SCL VOUT SDA FLEN JP1 0 R2 JP2 0 10k VIN Enable FL1 U1 JP3 L1 C4 Opt C1 2.2μF 1µH C3 47nF 1 2 3 4 5 6 7 CT EN FLEN AGND IN SW PGND RSET FLOUTA FLGND FLOUTB SDA SCL OUT SC1 0.50F FL 2 R4 30.1k 3 14 13 12 11 10 9 8 R3 30.1k AAT1282 TDFN33-14 R1 80.6k + 1 Bal Gnd 2 C2 2.2μF Figure 12: AAT1282 DB2 USB/I2C Evaluation Board Schematic. Figure 13: AAT1282 DB2 USB/I2C Evaluation Board Top Side Layout. Figure 14: AAT1282 DB2 USB/I2C Evaluation Board Bottom Side Layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 19 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Component Part# U1 AAT1282IWO U2 PIC12F675 SW1 – SW4 R1 R9 R2, R5, R6, R7, R8, R10, R11 R3, R4 R12, R13 JP1, JP2, JP8 PTS645TL50 Chip Resistor Chip Resistor Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM188R71A225KE15 C1608X5R1A225K GRM155R71A473KA01 C1005X7R1C473K GRM185R61A105KE36 SD3812-1R0-R VLS4012T-1RON1R6 * CMD15-21SRC/TR8 CMD15-21VGC/TR8 EDLC262020-501-2F50 PRPN401PAEN C1, C2 C3 C4 L1 FL1-FL2 LED1 LED2 SC1 JP3, JP4, JP5, JP6, JP7 Description High Power 2A Flash Driver; TDFN33-14 package 8-bit CMOS, FLASH-based μC; 8-pin PDIP package Switch Tact, SPST, 5mm 80.6kΩ, 1%, 1/4W; 0402 100kΩ, 1%, 1/4W; 0603 10kΩ, 5%, 1/4W; 0603 330Ω, 5%, 1/4W; 0603 30.1kΩ, 1%, 1/4W; 0805 0Ω, 5% 2.2μF, 10V, X7R, 0603 2.2μF, 10V, X5R, 0603 47nF, 10V, X7R, 0402 47nF, 16V, X7R, 0402 1μF, 10V, X5R, 0603 Drum Core, 1μH, 2.69A, 48mΩ Drum Core, 1μH, 2.6A, 60mΩ White Flash LED Red LED; 1206 Green LED; 1206 5.5V, 0.50F, Low ESR, 30mΩ Conn. Header, 2mm zip Manufacturer Skyworks Microchip ITT Industries Vishay Vishay Vishay Vishay Vishay Vishay Murata TDK Murata TDK Murata Cooper Bussmann TDK * Chicago Miniature Lamp Chicago Miniature Lamp TDK Sullins Electronics Table 4: AAT1282 Evaluation Board Component Listing. * Lumileds LXCL-PWM1 or LXCL-PWF4, OSRAM LW F65G, Seoul Semiconductor FCW401ZD based on availability from the manufacturer. 20 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Ordering Information Package Marking1 Part Number (Tape and Reel)2 TDFN33-14 ZGXYY AAT1282IWO-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 TDFN33-143 Detail "A" 3.000 ± 0.050 2.500 ± 0.050 Index Area 3.000 ± 0.050 1.650 ± 0.050 Top View Bottom View + 0.100 - 0.000 Pin 1 Indicator (Optional) 0.180 ± 0.050 Side View 0.400 BSC 0.000 0.203 REF 0.750 ± 0.050 0.425 ± 0.050 Detail "A" 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202305C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 21 DATA SHEET AAT1282 2A Driver for High Intensity LED Camera Flash Copyright © 2012, 2013 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. 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