PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM General Description Features The AAT3340 is a low-noise, constant-frequency charge pump DC/DC converter that uses a dual-mode load switch (1x) and fractional (1.5x) conversion to maximize efficiency for white LED applications. The AAT3340 is capable of driving 4 white LEDs at a total of 80mA from a single 2.7V to 5.5V input. The current sinks may be operated individually or in parallel while driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) makes the AAT3340 ideal for small battery-powered applications. • Dual-Mode (1x/1.5x) Charge Pump • Drives up to 4-Channel Backlight LEDs • 32-Level Programmable Backlight Current (linear, inverting) • Single-wire S2Cwire Control • Built-in Thermal Protection • Automatic Soft Start • -40°C to +85°C Temperature Range • TSOPJW-12 and TDFN33-12 Packages Analogic Tech’s Simple Serial Control (S2Cwire) digital interface is used to enable, disable and set current to one of 32 levels for the LEDs. Applications The AAT3340 is equipped with built-in short-circuit and over-temperature protection. The soft-start circuitry prevents excessive inrush current at start-up and mode transitions. The AAT3340 family is available in Pb-free, space-saving TSOPJW and TDFN33 packages, and operates over the -40°C to +85°C ambient temperature range. • • • • • • Cellular and Smart Phones Digital Still and Video Cameras PDAs Portable Devices Portable Media Players Other White LED Backlighting Typical Application C1+ C2+ C1 1µF VBATTERY 3.6V C IN 1µF EN/SET S2Cwire Serial Control C2 1µF C1- C2- IN OUT C OUT 1µF AAT3340 D1 D2 D3 D4 BL1 EN/SET BL2 BL3 BL4 GND 3340.2008.04.1.0 www.analogictech.com 1 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Pin Description Pin Number TDFN33-12 TSOPJW-12 Name 1 12 C1+ 2 11 OUT 3 10 IN 4 9 C2+ 5 6 7 8 9 10 11 12 EP 8 7 6 5 4 3 2 1 n/a EN/SET BL1 BL2 BL3 BL4 C1GND C2- Function Flying capacitor 1 positive terminal. Connect a 1μF ceramic capacitor between C1+ and C1-. Charge pump output to drive load circuit. Requires a 1μF or larger ceramic capacitor connected between this pin and ground. Input power supply. Requires a 1μF or larger ceramic capacitor connected between this pin and ground. Flying capacitor 2 positive terminal. Connect a 1μF ceramic capacitor between C2+ and C2-. AS2Cwire serial interface control pin. Current sink input #1. Current sink input #2. Current sink input #3. Current sink input #4. Flying capacitor 1 negative terminal. Ground pin Flying capacitor 2 negative terminal. Exposed paddle (bottom). Connect to GND directly beneath package. Pin Configuration TSOPJW-12 (Top View) 2 TDFN33-12 (Top View) C2- 1 12 C1+ GND 2 11 OUT C1- 3 10 BL4 4 9 C2+ BL3 5 8 EN/SET BL2 6 7 BL1 C1+ 1 12 C2- OUT 2 11 GND IN 3 10 C1- C2+ 4 9 BL4 EN/SET 5 8 BL3 BL1 6 7 BL2 IN www.analogictech.com 3340.2008.04.1.0 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Absolute Maximum Ratings TA = 25°C, unless otherwise noted. Symbol VIN VOUT VEN/SET VEN/SET(MAX) IOUT TJ Description Input Voltage Charge Pump Output EN/SET to GND Voltage Maximum EN/SET Voltage Maximum DC Output Current (sum of IOUT and D currents) Operating Junction Temperature Range Value Units -0.3 to 6 -0.3 to 6 -0.3 to 6 VIN + 0.3 120 -40 to 150 V V V V mA °C Value Units Thermal Information1 Symbol Description θJA Maximum Thermal Resistance2 PD Maximum Power Dissipation2 TJ Operating Junction Temperature Range TSOPJW-12 TDFN33-12 TSOPJW-12 TDFN33-12 160 50 625 2 -40 to 150 °C/W mW W °C 1. Mounted on an FR4 board. 2. Derate 6.25mW/°C above 25°C. 3340.2008.04.1.0 www.analogictech.com 3 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Electrical Characteristics VIN = 3.6V; CIN = COUT = 1µF; C1= C2 = 1µF; TA = -40°C to 85°C unless otherwise noted. Typical values are TA = 25°C. Symbol Parameter Conditions Input Power Supply VIN Input Voltage Range IQ ISHDN VIN_(TH) Operating Current VIN Shutdown Current Charge Pump Mode Hysteresis Min Typ Max Units 2.7 EN/SET = IN; 1x Mode, VD1 = VD2 = VD3; VD4 = 1V EN/SET = IN; 1.5x Mode, ID1 = ID2 = ID3; ID4 = Open EN/SET = GND 1x to 1.5x Transition at Any IDX; ID1 = ID2 = ID3; ID4 = 20mA 1.8 4.8 TSD Thermal Shutdown Threshold TSD(HYS) Thermal Shutdown Hysteresis LED Current Sink Outputs I(D-ACC) I(D-Match) VD_(TH) LED Current Accuracy LED Current Matching1 Hysteresis for Mode Change Charge Pump Maximum IDMAX Output Current fOSC Clock Frequency Charge Pump Mode Transition VBL_(TH) Threshold tSS Charge Pump Start Up Time EN/SET and S2Cwire Control EN/SET Input High Threshold VENH Voltage EN/SET Input Low Threshold VENL Voltage tEN/SET(HI_MIN) EN/SET Minimum High Time tEN/SET(HI_MAX) EN/SET Maximum High Time tEN/SET(LOW) EN/SET Input Low Time t EN/SET(OFF) EN/SET Input OFF Timeout tEN/SET(LAT) EN/SET Input Latch Timeout2 EN/SET = DATA1 EN/SET = DATA31 IMLED = 20mA IMLED = 20mA at 1.5x to 1x Mode 18 0.52 5.5 7.0 7.2 1 mA µA 0.15 V 140 15 °C °C 20 0.64 ±3 0.15 22 0.78 0.25 mA % V 120 mA 1 MHz 0.15 V 150 µs 1.4 V 0.4 V 75 75 500 500 ns µs µs µs µs 50 0.3 V 1. LED current match is defined as 100 (IDX - IAVG)/IAVG. 2. If the part has been shut down, then the latch time would be 500µs longer for soft start of charge pump. 4 www.analogictech.com 3340.2008.04.1.0 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Typical Characteristics VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted. No Load Operating Current (1.5x Mode) vs. Input Voltage No Load Operating Current (1x Mode) vs. Input Voltage 4.4 1.8 4.2 1.7 IQ (mA) IQ (mA) 4.0 3.8 85°C 60°C 40°C 25°C 0°C -20°C -40°C 3.6 3.4 3.2 3.0 1.6 85°C 60°C 40°C 25°C 0°C -20°C -40°C 1.5 1.4 1.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 2.7 3.1 3.5 3.9 Input Voltage (V) Output Voltage (V) VIN = 5.5V 0.7 0.6 ISHDN (µA) 5.1 5.5 5.2 0.8 0.5 0.4 0.3 VIN = 2.7V 0.2 5.1 VIN = 3.6V 5 4.9 4.8 VIN = 3.3V 4.7 4.6 0.1 4.5 -40 -15 10 35 60 85 0 20 Efficiency vs. Input Voltage 60 80 100 120 Efficiency vs. Input Voltage (Code 26, ILED = 3.8mA) (Code 1, BL = 20mA) 100 100 85 Efficiency (%) VF = 3.3V VF = 3V VF = 2.7V 70 55 40 2.7 40 Output Current (mA) Temperature (°C) Efficiency (%) 4.7 1.5X Mode Output Voltage vs. Output Current Shutdown Current vs. Temperature 0.0 4.3 Input Voltage (V) 3.1 3.5 3.9 4.3 4.7 5.1 5.5 85 70 55 40 2.7 Input Voltage (V) 3340.2008.04.1.0 VF = 3.3V VF = 3V VF = 2.7V 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Input Voltage (V) www.analogictech.com 5 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Typical Characteristics VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted. EN/SET Input Latch Timeout vs. Input Voltage EN/SET Input OFF Timeout vs. Input Voltage 400 350 350 tEN/SET(OFF) (µs) tEN/SET(LAT) (µs) 300 250 200 85°C 25°C -40°C 150 100 2.7 3.1 3.5 3.9 4.3 4.7 5.1 300 250 200 85°C 25°C -40°C 150 100 2.7 5.5 3.1 3.5 Input Voltage (V) 21 1.0 20 VENH (V) Output Current (mA) 1.2 20 19 BL4 BL3 BL2 BL1 19 0 10 20 30 40 4.7 5.1 5.5 EN Input High Threshold Voltage vs. Input Voltage 21 -40 -30 -20 -10 4.3 Input Voltage (V) Output Current Matching Over Temperature 18 3.9 50 60 70 80 0.8 0.6 -40°C 25°C 85°C 0.4 0.2 2.7 90 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Input Voltage (V) Temperature (°C) 1x Mode Turn-On Waveform EN Input Low Threshold Voltage vs. Input Voltage (VIN = 3.6V; Load = 80mA) 1.2 EN (2V/div) VENL (V) 1.0 VOUT (4V/div) VBL (4V/div) 0.8 0.6 -40°C 25°C 85°C 0.4 0.2 2.7 3.1 3.5 3.9 4.3 4.7 5.1 IIN (200mA/div) 0 0 0 5.5 Input Voltage (V) 6 0 Time (100µs/div) www.analogictech.com 3340.2008.04.1.0 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Typical Characteristics VIN = 3.6V, CIN = COUT = C1 = C2 = 1μF; TA = 25°C, unless otherwise noted. 1.5x Mode Turn-On Waveform 1.5x Mode Load Characteristics (VIN = 3.3V; 80mA Load) (VIN = 3.3V; 80mA Load) VOUT (AC) (50mV/div) VOUT (2V/div) VBL (2V/div) 0 0 C1N (2V/div) EN 0 (2V/div) C2N (2V/div) IIN (200mA/div) 0 VIN (AC) (20mV/div) 0 0 0 Time (100µs/div) 0 Time (800ns/div) 1.5x Mode Turn-Off (VIN = 3.3V; Load = 80mA) VF (1V/div) 0 EN (1V/div) 0 IIN (100mA/div) 0 Time (200µs/div) 3340.2008.04.1.0 www.analogictech.com 7 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Functional Block Diagram IN C1+ Dual-mode Charge Pump 1X/1.5X C1C2+ OUT C24 BL1 EN/SET 32-step S2Cwire Backlight Control BL2 Control Logic BL3 BL4 GND Functional Description Application Information The AAT3340 is a high efficiency charge pump white LED driver for portable applications. It can drive 4 white LEDs. Current Level Settings The AAT3340 is a fractional charge pump and can multiply the input voltage by 1 or 1.5 times. The charge pump switches at a fixed frequency of 1MHz. The internal-modeselection-circuit automatically switches the mode between 1x and 1.5x mode base on the input voltage, output voltage and load current. This mode switching maximizes the efficiency throughout the entire load range. LED current level is set via AnalogicTech’s Simple Serial Control (S2Cwire) interface in a linear scale where each code is 0.6mA smaller than the previous code, as shown in Figure 1. In this manner, the LED current decreases linearly with each increasing code. LED Current vs. S2C Data (VF = 3.0V @ 20mA) When the input voltage is high enough, the AAT3340 operates in 1x mode to provide maximum efficiency. If the input voltage is too low to supply programmed LED current, typically when the battery discharges and the voltage decays, a 1.5x mode is automatically enabled. When the battery is connected to a charger and the input voltage become high enough again, the device will switch back to 1x mode. The current sink magnitude is controlled by the EN/SET serial data S2Cwire interface. The interface records rising edges of the EN/SET pin and decodes them into 32 individual current level settings. 8 LED Current (mA) 25 20 15 10 5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1718 19 20 21 22 23 24 25 26 27 28 29 30 31 32 S2C Code Figure 1: LED Current Level vs. Simple Serial Control (S2Cwire). www.analogictech.com 3340.2008.04.1.0 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM S2Cwire Data LED Current (mA) S2Cwire Data LED Current (mA) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 20.0 19.4 18.7 18.1 17.4 16.8 16.1 15.5 14.8 14.2 13.6 12.9 12.3 11.6 11.0 10.3 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 9.7 9.0 8.4 7.7 7.1 6.5 5.8 5.2 4.5 3.9 3.2 2.6 1.9 1.3 0.6 0.3 put current at the programmed level. The device is disabled 500μs after the EN/SET pin enters a logic low state. The EN/SET timing is designed to accommodate a wide range of data rates. After the first rising edge of EN/SET, the charge pump is enabled and reaches full capacity after the soft-start time (TSS). Exact counts of clock pulses for the desired current level should be entered on the EN/SET pin with a single burst of clocks. The counter refreshes each time a new clock input to the EN/SET pin is detected. A constant current is sunk as long as EN/SET remains in a logic high state. The current sink pins are switched off after EN/SET has remained low state for at least the tOFF timeout period (see Figure 1). LED Selection The AAT3340 is designed to drive white LEDs with forward voltages up to 4.8V. Since BL1 through BL4 output current sinks are matched with negligible voltage dependence; the LED brightness will be matched regardless of their forward voltage matching. Table 2: S2C Data vs LED Current. EN/SET Serial Interface The LED current magnitude is controlled by the EN/SET pin using the S2Cwire interface. The interface records rising edges of the EN/SET pin and decodes them into 32 individual current level settings. Code 1 is full scale, and Code 32 is 0.3mA. The modulo 32 interface wraps states back to state 1 after the 32nd clock. The counter can be clocked at speeds up to 1MHz, so intermediate states are not visible. The first rising edge of EN/SET enables the IC and initially sets the output LED current to full scale, the lowest setting equal to 0.3mA. Once the final clock cycle is input for the desired brightness level, the EN/ SET pin should be held high to maintain the device out- The AAT3340 operates at a fixed frequency of 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-topeak, typically ten times less than inductor-based DC/DC boost converter white LED backlight solutions. The AAT3340 soft-start feature prevents noise transient effects associated with inrush currents during startup of the charge pump circuit. tLO t HI OFF Device Switching Noise Performance 1 tOFF 2 3 OFF Figure 2: EN/SET Timing Diagram. 3340.2008.04.1.0 www.analogictech.com 9 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Power Efficiency and Device Evaluation The charge pump efficiency discussion in the following sections accounts only for efficiency of the charge pump section itself. Due to the unique circuit architecture and design of the AAT3340, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. Since the AAT3340 outputs are pure constant current sinks and typically drive individual loads, it is difficult to measure the output voltage for a given output 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 components count, reliability, operating range, and total energy usage...not just % efficiency. The AAT3340 efficiency may be quantified under specific conditions and is dependent upon the input voltage and voltage on BL outputs BL1 through BL4 for a given constant current setting. At any given current setting, if VIN is sufficiently high to avoid drop-out for all the BL pin in 1x mode, the device stays in 1x mode. If in 1x mode, Vin is less than the voltage required on any of the 4 current sink channels to avoid drop-out, the device will operate in 1.5x charge pump mode. Each of these two modes will yield different efficiency values. The AAT3340 contains a fractional charge pump which will boost the input supply voltage when VIN is less than the voltage required on the constant current sink pins. The ideal efficiency (η) can be defined as: η= PLED VF · ILED = PIN VIN · IIN VF is the LED forward voltage. In 1x mode, IIN = ILED + IQ. Ignore the quiescent current, it’s much smaller than ILED. 10 η= VF · ILED VIN · IIN In 1.5X mode, IIN = 1.5 · ILED + IQ. Ignore the quiescent current, it’s much smaller than ILED. η= VF · ILED VIN · 1.5 · IIN Please also refer to the Typical Characteristics section of this document for measured plots of efficiency versus input voltage and output load current for the given charge pump output voltage options. Capacitor Selection Careful selection of the four external capacitors CIN, C1, C2, and COUT is important because they will affect turnon time, output ripple, and transient performance. Optimum performance will be obtained when low equivalent series resistance (ESR) ceramic capacitors are used. In general, low ESR may be defined as less than 100mΩ. A value of 1μF for all four capacitors is a good starting point when choosing capacitors. If the LED current sinks are only programmed for low current levels, then the capacitor size may be decreased. Test Current/Channel Disable Each current sink channel is equipped with a test current function. While it has been enabled, the AAT3340 automatically detects the presence of LEDs all the time. Unused channels that are tied to OUT or LED loads that have failed will be automatically disabled. Capacitor Characteristics Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3340. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor has very low ESR, is lowest cost, has a smaller PCB footprint, and is non-polarized. 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. www.analogictech.com 3340.2008.04.1.0 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Equivalent Series Resistance ESR is an important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor that 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. Ceramic Capacitor Materials Ceramic capacitors less than 0.1μF are typically made from NPO or C0G materials. NPO and C0G materials have tight tolerance and are stable over temperature. Capacitors with large values are typically composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors, greater than 2.2μF, are often available in low-cost Y5V and Z5U dielectrics, but capacitors greater than 1μF are usually not required for AAT3340 applications. 3340.2008.04.1.0 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. Thermal Protection The AAT3340 has a built-in thermal protection circuit that will shut down the charge pump if the die temperature rises above the thermal limit, as is generally the case during short-circuit event of the VOUT pin. Evaluation Board Layout When designing a PCB for the AAT3340, the key requirements are: 1. 2. Place the two flying capacitors, C1 and C2, as close to the chip as possible, otherwise the 1.5X mode performance will be compromised. Place the input and output decoupling capacitors as close to the chip as possible to reduce switching noise and output ripple. www.analogictech.com 11 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM AAT3340 Evaluation Board Schematic C2 1µF J1 DC+ DC+ C8 10µF 1 2 COUT 1µF C2+ C2- 3 C1 1µF C1+ C1- DC- CPO U1 1 2 3 4 5 6 VIN JP1 CIN 1µF D4 AAT3340 C1P CPO VIN C2P EN/SET BL1 C2N GND C1N BL4 BL3 BL2 12 11 10 9 8 7 BL4 BL3 BL2 D3 D2 D1 R12 0 R9 0 R10 0 R11 0 BL1 EXP PAD EN/SET +3.3V R5 1K 20K S2C R4 R3 1K 1K S1 S1 UP GND R2 JP5 C6 4.7µF U2 PIC12F675 1 2 3 4 VDD GP5 GP4 GP3 VSS GP0 GP1 GP2 VR1 POT10K 8 7 6 5 C4 R7 0.1µF 330 LED2 Red R6 330 S2 S2 DOWN LED1 Green S3 S3 CYCLE Figure 3: AAT3340 Evaluation Board Rev.1A Schematic. Figure 4: AAT3340 Evaluation Board Rev.1A PCB Component Side Layout. 12 Figure 5: AAT3340 Evaluation Board Rev.1A Solder Side Layout. www.analogictech.com 3340.2008.04.1.0 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM Ordering Information Interface Current Control Package Marking Part Number(Tape & Reel) S2Cwire S2Cwire 32-step 32-step TSOPJW-12 TDFN33-12 2GXYY 2HXYY AAT3340ITP-1-T1 AAT3340IWP-1-T1 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/about/quality.aspx. Package Information TSOPJW-12 2.85 ± 0.20 2.40 ± 0.10 0.20 + 0.10 - 0.05 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 7° NOM 0.04 REF 0.055 ± 0.045 0.15 ± 0.05 + 0.10 1.00 - 0.065 0.9625 ± 0.0375 3.00 ± 0.10 4° ± 4° 0.45 ± 0.15 0.010 2.75 ± 0.25 All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3340.2008.04.1.0 www.analogictech.com 13 PRODUCT DATASHEET AAT3340 ChargePump High Efficiency 1x/1.5x Charge Pump TM TDFN33-12 Index Area 0.43 ± 0.05 0.1 REF C0.3 0.45 ± 0.05 2.40 ± 0.05 3.00 ± 0.05 Detail "A" 3.00 ± 0.05 1.70 ± 0.05 Top View Bottom View 0.23 ± 0.05 Pin 1 Indicator (optional) 0.05 ± 0.05 0.23 ± 0.05 0.75 ± 0.05 Detail "A" Side View All dimensions in millimeters. 1. 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. Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. 14 www.analogictech.com 3340.2008.04.1.0