SD3812-1R0-R

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Document overview

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• PDF pages: 17

Technical content

Features

• Input Voltage Range: 2.7V to 5.5V
• Single Channel Flash Output
• Up to 1.5A Regulated Output Current
• Up to 88% Efficiency
• 2 MHz Switching Frequency
• Separate Flash Enable
• Single Resistor Sets Flash and Movie Mode Current ▪ AS 2Cwire Single Wire Programming:
• Movie Mode Current
• Flash/Movie Mode Current Ratio
• True Load Disconnect
• Soft-Start and Input Current Limit
• Over-Voltage (Open LED, Open Circuit), Short Circuit, and Over-Temperature Protection
• -40°C to +85°C Temperature Range
• TDFN33-14 Package

Applications

• LED Photo Flash / Torch
• Camera Enabled Mobile Devices
• Cellphones/Smartphones
• Digital Still Cameras (DSCs)
• Multimedia Mobile Phones Typical Application AAT1274 RSET CIN 2.2μF COUT 2.2μF IN OUT EN/SET FLEN AGNDPGND FLGND RSET Flash LED Enable/Set Input Flash Enable FL VBAT = 2.7V to 5.5V SW L1 1μH FLINHFlash Inhibit

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Pin Descriptions Pin # Symbol Description 1,5 AGND Analog ground pin. Connect AGND to PGND, and FLGND at a single point as close to the AAT1274 as possible. 2 EN/SET Enable and Serial Control input. EN/SET is the AS2Cwire addressing and programming input to: a) adjust the movie-mode current level; b) select the Flash-to-Movie-mode ratio; 3 FL LED Flash current sink pin. Connect the cathode of Flash LED to FL. 4 FLEN Flash enable pin. A low-to-high transition on the FLEN pin initiates a fl ash pulse and a high-to-low transition on the FLEN pin terminates a fl ash pulse 6I N Flash output boost converter power input. Connect IN to the input power source. Connect a 2.2μF or larger ceramic capacitor from IN to PGND and locate as close as possible to the AAT1274 package for optimum per- formance. 7 PGND Power ground. Connect PGND to the same single point as AGND located as close to the AAT1274 as possible 8 OUT Power output of the boost converter. Connect a 2.2μF or larger ceramic capacitor from OUT to PGND as close as possible to the AAT1274. Connect OUT to the anode of the Flash LED. 9, 12 NC Not connected 10 SW Boost converter switching node. Connect a 1 μH inductor between SW and IN. 11 FLINH Flash inhibit pin. FLINH is an active HIGH control input with an internal 200kΩ resistor to AGND. A low-to- high transition on the FLINH pin reduces FL sink current to the maximum (default) movie-mode current level. 13 FLGND Flash ground pin. Connect FLGND to PGND, and AGND at a single point as close to the AAT1274 as possible. 14 RSET Flash current set pin. Connect a resistor from RSET to AGND to program the desired fl ash current for the cur- rent sink FL. Pin Configuration TDFN33-14 (Top View) AGND EN/SET FL FLEN AGND IN RSET FLGND N/C FLINH SW N/C PGND 7 OUT8

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at co nditions other than the operating conditions specified is not implied. 2. Mounted on an FR4 board. 3. Derate 20mW/°C above 25°C. Absolute Maximum Ratings1 TA = 25°C unless otherwise noted. Symbol Description Value Units IN, OUT, SW Maximum Rating -0.3 to 6.0 VEN/SET, FLEN, FLINH, RSET, FL Maximum Rating -0.3 to V IN + 0.3 TJ Operating Junction Temperature Range -40 to 150 CTS Storage Temperature Range -65 to 150 TLEAD Maximum Soldering Temperature (at Leads, 10 sec) 300 Thermal Information2 Symbol Description Value Units JA Thermal Resistance3 50 OC/W PD Maximum Power Dissipation 2 W

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012

Electrical Characteristics

VIN = 3.6V; CIN = COUT = 2.2μF; RSET = 107kΩ; L = 1μH. TA = -40oC to 85°C unless otherwise noted. Typical values are at TA = 25°C. Symbol Description Conditions Min Typ Max Units Power Supply – Switching Flash Driver VIN Input Voltage Range 2.7 5.5 V VOUT(MAX) Maximum Output Voltage 5.5 V IIN(Q) Supply Current EN/SET = FLEN = IN, Set FL Load = 1.5A 0.67 1 mA EN/SET = IN, FLEN = AGND 0.23 ISHDN(MAX) Input Shutdown Current EN/SET, FLEN, = AGND 1.0 μA IFL Output Current, Flash Mode R SET = 107kΩ 1.2 1.5 A IFL(ACC) Flash Current Accuracy R SET = 107kΩ = 1.2A ±10 % IMM(LOAD) Total Output Current, Movie Mode R SET = 107kΩ, Movie mode current set to 100% 206 mA FOSC Switching Frequency T A = 25°C 1.5 2.0 2.5 MHz TSD Over-Temperature Shutdown Threshold 140 °C TSD(HYS) Over-Temperature Shutdown Hysteresis 15 °C EN/SET, FLEN VEN/SET(H), VFLEN(H) EN/SET, FLEN Input High Threshold 1.4 V VEN/SET(L), VFLEN(L) EN/SET, FLEN Input Low Threshold 0.4 V IEN/SET, IFLEN EN/SET, FLEN Input Leakage Current V EN/SET, VFLEN = IN = 5V -1 1 μA VT(FLINH) FLINH Input Threshold Voltage ½ IN V RIN(FLINH) FLINH Input Resistance to AGND 200 k Ω tEN/SET(LO) EN/SET Serial Interface Low Time 0.3 75 μs tEN/SET(HI-MIN) Minimum EN/SET High Time 50 ns tEN/SET(HI-MAX) Maximum EN/SET High Time 75 μs tEN/SET(OFF) EN/SET Off timeout time 500 μs tENSET(LAT) EN/SET Latch Timeout Time 500 μs tFLEN(ON) FLEN On Delay Time EN/SET = AGND 40 μs tFLEN(OFF) FLEN Off Delay Time EN/SET = AGND 10 μs tFLINH_ON FLINH ON Delay Time 93 μs

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Typical Characteristics Flash Mode Efficiency vs. Input Voltage Input Voltage (V) Efficiency (%) 100 320mA, VF = 2.91V 540mA, VF = 3.00V 700mA, VF = 3.04V 900mA, VF = 3.04V 1500mA, VF = 3.15V 1200mA, VF = 3.27V Movie Mode Efficiency vs. Input Voltage Input Voltage (V) Efficiency (%) 204mA 104mA 52mA Boost Switching Frequency vs. Input Voltage (Movie Mode; L = 1µH) Input Voltage (V) Switching Frequency (MHz) 0.5 1.5 2.5 85°C 25°C -40°C Shutdown Current vs. Input Voltage (VEN/SET = VFLEN = 0V) Input Voltage (V) Shutdown Current (µA) 0.005 0.01 0.015 0.02 0.025 0.03 25°C -40°C Supply Current vs. Input Voltage (VEN = VFLEN = 3.6V) Input Voltage (V) Supply Current (µA) 100 200 300 400 500 600 700 800 900 1000 85°C 25°C -40°C Movie Mode LED Current vs. Temperature (IFL = 206mA/Ch; VIN = 3.6V; L = 1µH) Temperature (°C) Output Current (mA) -40 -15 10 35 60 85 185 190 195 200 205 210 215 220 225

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Typical Characteristics Movie Mode LED Current Accuracy vs. Input Voltage (IFL = 206mA; L = 1µH) Input Voltage (V) Output Current (mA) -10 Movie Mode Output Ripple (IFL = 206mA; VIN = 3.6V; L = 1µH) Time (500ns/div) VOUT (AC Coupled) (50mV/div) IINDUCTOR (100mA/div) VINDUCTOR (2V/div) 100mA Flash Mode Output Ripple (IFL = 1.5A; VIN = 4V; L = 1µH) Time (200ns/div) VOUT (AC Coupled) (50mV/div) IINDUCTOR (50mA/div) VINDUCTOR (2V/div) 1.65A Flash LED Current vs. Temperature (IFL = 1.5A; VIN = 4.2V; L = 1µH) Temperature (°C) Output Current (mA) -40 -15 10 35 60 85 1420 1440 1460 1480 1500 1520 1540 1560 1580 Flash On Time Delay vs. Input Voltage (IFL = 1.5A; COUT = 2.2µF; L = 1µH) Input Voltage (V) TFLEN_OND (µs) -40°C 25°C 85°C Movie Mode Line Transient (IFL = 206mA; VIN = 4.2V to 3.6V) Time (50µs/div) IFL (AC Coupled) (50mA/div) VIN (500mV/div) 4.2V 3.6V

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Typical Characteristics Flash Turn On Characteristic (IFL = 1.5A; VIN = 3.6V; L = 1µH) Time (50µs/div) VFLEN (5V/div) IFL (1A/div) VFL (2V/div) VOUT (2V/div) Movie Mode to Flash Turn On Characteristic (IFL = 206mA to 1.5A; VIN = 3.6V; L = 1µH) Time (50µs/div) VFLEN (2V/div) IFLOUTX (1A/div) VFL (500mV/div) VOUT (2V/div) Movie Mode Turn On Characteristic (IFL = 206mA; VIN = 3.6V; L = 1µH) Time (100µs/div) VEN/SET (5V/div) IFL (200mA/div) VFL (500mV/div) VOUT (2V/div) Movie Mode Transition Characteristic (IFL = 206mA to 376mA; COUT = 0.22µF; VIN = 3.6V; L = 1µH) Time (100µs/div) VEN/SET (2V/div) IFL (200mA/div) VFL (500mV/div) VOUT (2V/div) EN, FLEN High Threshold Voltage vs. Input Voltage Input Voltage (V) VEN/SET(H), VFLEN(H) (V) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 85°C 25°C -40°C EN, FLEN Low Threshold Voltage vs. Input Voltage Input Voltage (V) VEN/SET(L), VFLEN(L) (V) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 85°C 25°C -40°C

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Typical Characteristics EN/SET Off Timeout vs. Input Voltage Input Voltage (V) TEN/SET(OFF) (µs) 100 150 200 250 300 85°C 25°C -40°C EN/SET Latch Timeout vs. Input Voltage Input Voltage (V) TEN/SET(LAT) (µs) 100 150 200 250 300 85°C 25°C -40°C

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Functional Description The AAT1274 is a boost converter with a current regu- lated output designed to drive high current white LED used in camera flash applications. The AAT1274 has a constant current sink channel to accurately regulate the current flow through a high current, high intensity white flash LED. The AAT1274 has two basic operating modes; a flash mode controlled by the FLEN pin and the movie/ torch light mode controlled through the AS 2Cwire inter- face. Flash Mode A flash pulse may be initiated by pulling the FLEN input pin from a logic low-to-high state, which initiates a flash pulse. The maximum flash current in the AAT1274 is set by an external resistor, R SET, which sets the flash current and the maximum movie-mode current. In mobile GSM systems where the phone remains in constant contact with the base station by regular com- munication, a FLINH pin is provided to prevent both the camera flash and PA transmission pulses from occurring simultaneously. This avoids potential dips to the Li-ion battery voltage below the system’s undervoltage lockout threshold (UVLO). During a flash event, strobing the FLINH pin low-to-high reduces the LED current to the default movie-mode current level for the duration of FLINH. Strobing FLINH high-to-low instructs the AAT1274 to revert the flash LED current to its maximum level, assuming that the FLEN pin is still active (high). Movie (Torch) Mode The movie / torch mode current level, and the flash to maximum movie mode current ratio are programmed by the AAT1274 AS 2Cwire interface. The movie-mode cur- rent level can be adjusted to one of 16 steps using a logarithmic scale where each code level is 1dB below the previous code. The flash to maximum movie mode cur- rent ratio can be set from 1:2 to 1:30 with respect to the maximum programmed flash current as set by the R SET resistor. The manual FLEN signal has priority over movie- mode operation. Functional Block Diagram System Control Enable and AS2C Interface OUT (to Flash LED) FL FLGND RSET PGNDAGND FLEN EN/SET IN SW FLINH

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Movie mode operation is controlled entirely by the AS2Cwire interface via the EN/SET pin. The FLEN signal will override movie-mode AAT1274 operation when tog- gled to a logic high level. The part will not reenter movie mode when FLEN is brought low. To reenter movie mode after a flash event the part must be cycled off and back on to reset the movie mode and reprogrammed via the AS 2Cwire interface to the desired movie mode operation. Over-Voltage Protection (Open Flash LED, Open Circuit) The AAT1274 boost converter output is voltage limited by internal overvoltage protection circuitry to prevent dam- age to the device in the event an open LED or open circuit condition occurs. During an open circuit condition, the output voltage will rise to 5.5V (typical). The OVP circuit disables the boost converter to prevent the output voltage from rising above 5.5V. Once the open circuit condition is removed, normal boost operation will resume. Short Circuit Protection The AAT1274 is equipped with an auto-disable feature for the flash LED channel. After the IC is enabled and system start up commences, a test current of 2-3mA (typical) is forced through the sink channel. The channel will be disabled if the voltage of the SINK pin does not drop to a predetermined threshold. This feature is very convenient for disabling the current sink in the event the flash LED fails to a short circuit. This small test current is added to the set output current in both Flash and movie mode conditions. Over-Temperature Protection The AAT1274 has internal thermal protection circuitry to disable the device if the internal power dissipation exceeds a preset thermal limit. The junction over-temperature threshold is 140°C with 15°C of temperature hysteresis. During flash or movie-mode operation, if an environmen- tal condition, flash current sink, or the boost converter causes the internal die temperature to rise above 140°C, the boost converter will be shut down. The boost con- verter output operation will automatically recover when the over-temperature fault condition is removed.

Application Information

Flash sink current can be programmed up to a maximum of 1.5A. The maximum flash current is set by the R SET resistor. For the desired flash current, the resistor value can be calculated using the following equation: 162kΩ × A RSET 162kΩ 107kΩIFL = = = 1.5A A flash event is initiated by asserting the FLEN pin. A flash event is automatically terminated when FLEN is deasserted. Any time that the FLINH pin is asserted, the default movie-mode current level will appear at FL chan- nel. The default movie mode current level will be main- tained on FL as long as the FLINH and FLEN pins are asserted. In addition to setting the flash current via R SET, the flash current can be changed after FLEN is asserted by programming the movie mode current register with 16 different steps. AS2Cwire Control of Movie Mode Operation In the AAT1274 control of the movie mode operation is managed by the Advanced Simple Serial Control (AS2Cwire) interface. AS2Cwire relies on the number of rising edges of the EN/SET pin to address and load internal data reg- isters. Referring to Table 1:  Address 0 controls the movie mode (MM) current level as a percentage of the maximum movie mode current level.  Address 3 sets the maximum possible current for movie mode operation. The maximum movie mode current is set as a fraction of the flash current with a peak value of 1/2 and default value of 1/7.3.  The last column in Table 1 shows the default values for each of the address registers.

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Address EN/SET Rising Edges Function Default (No Programming) 01 7 Movie Mode Current 100%

1 Not Used

2 Not Used

1/7.3 Table 1: AS2Cwire Serial Interface Addressing. AS2Cwire Serial Interface AS2Cwire latches data or address after the EN/SET pin has been held high for longer than t LAT (500μs). Address or data are differentiated by the number of EN/SET rising edges. Since the data registers are 4 bits each, the dif- ferentiating number of pulses is 2 4 or 16, so that Address 0 is signified by 17 rising edges, and Address 3 by 20 rising edges. Data is inclusively applied to any number of rising edges between 1 and 16. A typical write protocol is a burst of EN/SET rising edges which signify a particular address that is followed by a pause with EN/SET held high for the prescribed t LAT timeout period, then a burst of rising edges signifying data, and a tLAT timeout for the data registers. Once an address is set, then multiple writes to the corresponding data register are allowed. Address 0 is the default address on the first rising edge after the AAT1274 has been disabled. When EN/SET is transitioned from high to low and held low longer than t OFF (500 μs), the device enters a shutdown mode and draws less than 1uA from the input supply. All data and address are cleared (reset to 0) during shutdown. AS 2Cwire addressing allows for control of the movie mode output current, and the ratio of movie-mode current to flash current. If there are no programmed write instruc- tions applied to the EN/SET pin prior to the assertion of the FLEN pin and the device is enabled, then all registers will be loaded with their default values shown in Table 1. In the event that the number of rising edges applied at the EN/SET pin is less than 17, the internal state machine will interpret instruction to program the output currents to the desired current level for movie-mode operation. Movie Mode Current – Address 0 The AAT1274 movie mode current settings are controlled using the AS 2Cwire interface. The default ratio between the flash current level and maximum movie mode cur- rent level is 1:7.3. For example, if an R SET value of 107k Ω is chosen, then the flash current is set to 1500mA. For movie mode operation, the maximum current available is then: IFL(MAX) 7.3 1500mA

7.3 IMOVIE MODE = = = 206m A

1 2 . . . n ≤ 16 THI TLO TLAT TLAT Figure 1: AS2Cwire Serial Interface Timing Diagram.

• Denotes the default value.

Address 0 controls precise movie mode current levels. of the set movie-mode current. Table 3. The default value for Address 3 is Data = 4 and

7.3 IMOVIE MODE =

7.3 IMOVIE MODE = = 206m A

16 OFF

exhibit excessive temperature rise.

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Selecting the Boost Capacitors In general, it is a good design practice to place a decou- pling capacitor (input capacitor) between the IN and ground. An input capacitor in the range of 2.2μF to 10μF is recommended. A larger input capacitor in this applica- tion may be required for stability, transient response, and/or ripple performance. The high output ripple inher- ent 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 AAT1274 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 (∆V OUT) dur- ing the power switch ON interval. A 2.2μF ceramic output capacitor is recommended (see Table TBD). Typically, 6.3V or 10V rated capacitors are required for this flash LED boost output application. Ceramic capacitors selected as small as 0603 are available which meet these require- ments. MLC capacitors exhibit significant capacitance reduction with applied voltage. Output ripple measure- ments should confirm that output voltage droop and operating stability are within acceptable limits. Voltage de-rating can minimize this factor, but results may vary with package size among specific manufacturers. To maintain stable operation at full load, the output capaci- tor should be selected to maintain ∆V OUT between 100mV and 200mV. The boost converter input current flows dur- ing 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. 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 para- sitic PCB effects (stray resistance, capacitance, and inductance) and EMI coupling from the high frequency SW node. A suggested PCB layout for the AAT1274 1.5A step-up regulator is shown in Figures 3 and 4. The fol- lowing PCB layout guidelines should be considered: 1. Minimize the distance from capacitor C IN and C OUT’s negative terminals to the PGND pins. This is espe- cially true with output capacitor C OUT, which conducts high ripple current from the output to the PGND pins. 2. Minimize the distance under the inductor between IN and switching pin SW; minimize the size of the PCB area connected to the SW pin. 3. Maintain a ground plane and connect to the IC PGND pin(s) as well as the PGND connections of C IN and COUT. 4. Consider additional PCB exposed area for the flash LED to maximize heatsinking capability. This may be necessary when using high current application and long flash duration application. 5. Connect the exposed paddle (bottom of the die) to PGND or GND. Connect AGND, FLGND to GND as close as possible to the package. Manufacturer Part Number Inductance (μH) Saturated Rated Current (A) DCR (mΩ) Size (mm) LxWxH Type Cooper Bussmann SD3812-1R0-R 1 2.69 48 4.0 x 4.0 x 1.2 shielded drum core Cooper Bussmann SDH3812-1R0-R 1 3 45 3.8 x 3.8 x 1.2 shielded drum core Sumida CDH38D11/S 1 2.69 48 4.0 x 4.0 x 1.2 shielded drum core Coilcraft LPS4012-102NLC 1 2.5 60 4.1 x 4.1 x 1.2 shielded drum core Table 4: Typical Suggested Surface Mount Inductors. Manufacturer Part Number Capacitance ( μF) Voltage Rating (V) Temp Co. Case Size Murata GRM185R60J225KE26 2.2 6.3 X5R 0603 Murata GRM188R71A225KE15 2.2 10 X7R 0603 Murata GRM21BR70J225KA01 2.2 6.3 X7R 0805 Murata GRM21BR71A225KA01 2.2 10 X7R 0805 Murata GRM219R61A475KE19 4.7 10 X5R 0805 Murata GRM21BR71A106KE51 10 10 X7R 0805 Table 5: Typical Suggested Surface Mount Capacitors.

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 2.2μFC1 2.2μF 133k DC+ VOUT JP1 VDD1 GP52 GP43 GP34 GP2 5GP1 6GP0 7VSS 8 PIC12F675 1μF 100k (opt) 330 LED1 RED 12 34 5

0 SW4

L1 CooperBussmann SD3812-1R0-R, 1μH, 2.69A, 48mΩ C1, C2 Murata GRM188R71A225KE15 2.2μF, 0603, X7R, 10V D1 Lumiled LXCL-PWF4 or equivalent 1uH AGND5 AGND1 IN6 OUT 8 EN/SET2 FL3 PGND7 FLEN4 N/C 9SW 10FLINH 11N/C 12FLGND 13RSET 14 AAT1274 TDFN33-14C4 220μF 12 34 5 SW3 FLEN R10 100k Figure 2: AAT1274 Evaluation Board Schematic. Figure 3: AAT1274 Evaluation Board Figure 4: AAT1274 Evaluation Board Top Side Layout. Bottom Side Layout.

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 Component Part Number Description Manufacturer U1 AAT1274IWO 1.5A Step-Up Current Regulator for Flash LED; TDFN33-14 package Skyworks U2 PIC12F675 8-bit CMOS, FLASH-based μC; 8-pin SOIC package Microchip SW1 – SW4 PTS645TL50 Switch Tact, SPST, 5mm ITT Industries R1 Chip Resistor 133k Ω, 1%, 1/4W; 0402 Vishay R2, R4, R10 Chip Resistor 100k Ω, 1%, 1/4W; 0603 Vishay R3, R5, R6, R7 Chip Resistor 10k Ω, 5%, 1/4W; 0603 Vishay R8, R9 Chip Resistor 330 Ω, 5%, 1/4W; 0603 Vishay JP1, JP2 Chip Resistor 0 Ω, 5% Vishay C1, C2 GRM188R71A225KE15 2.2 μF, 10V, X7R, 0603 MuRata C3 GRM216R61A105KA01 1 μF, 10V, X5R, 0805 MuRata L1 SD3812-1R0-R Drum Core, 1 μH, 2.69A, 48mΩ Cooper Bussmann D1 FCW401Z4 White Flash LED Seoul Semiconductor LED1 CMD15-21SRC/TR8 Red LED; 1206 Chicago Miniature Lamp LED2 CMD15-21VGC/TR8 Green LED; 1206 Chicago Miniature Lamp JP3, JP4, JP5 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics Table 6: AAT1274 Evaluation Board Bill of Materials.

1.5A Single Flash LED Driver IC DATA SHEET Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012 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 th e 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 c onnection.

Ordering Information

Package Marking 1 Part Number(Tape and Reel)2 TDFN33-14 B1XYY AAT1274IWO-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

3.000 ±± 0.050 Index Area 3.000 ±± 0.050 Detail "A" 1.650 ±± 0.050 2.500 ±± 0.050

0.203 REF

0.750 ±± 0.050 0.000 + 0.100 - 0.000 Detail "A" Side View 0.425 ±± 0.050 0.400 BSC0.180 ±± 0.050 Pin 1 Indicator (Optional)

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