PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Description Features The AAT3169 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The AAT3169 is capable of driving six LEDs for a total of 180mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUTCP) make this part ideally suited for small, batterypowered applications. • VIN Range: 2.7V to 5.5V • Fully Programmable Current with Single Wire ▪ 16-Step Logarithmic Scale ▪ 15/20/30mA Max Current ▪ Four Low-Current Settings Down to 115µA ▪ Low IQ (65µA) for Single-Channel, Low-Current Mode • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage • Drives Up to Six LEDs • Individual Main-Sub (5-1) Group Control • No Inductors, Low Noise Operation • 1MHz Constant Switching Frequency • Small Application Circuit • Built-In Thermal Protection • Built-In Auto-Disable for Open Circuit • Automatic Soft Start • IQ <1µA in Shutdown • Thermally-Enhanced STDFN33-14 or QFN44-16 Package AnalogicTech’s AS2Cwire™ (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 115µA. For optimized efficiency, low-current settings require only 65µA of housekeeping current. Each output of the AAT3169 is equipped with built-in protection for output short-circuit and auto-disable for load short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A lowcurrent shutdown feature disconnects the load from the input and reduces quiescent current to less than 1µA. The AAT3169 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package or a low-profile 14-pin 3x3mm STDFN package and is rated over the -40°C to +85°C temperature range. Applications • • • • • Color (RGB) Lighting Programmable Current Sink Transmissive Displays White LED Backlighting White Photo Flash for Digital Still Cameras Typical Application C1+ C2+ C1 1µF C2 1µF C1- OUTCP IN 2.7V to 5.5V CIN 1µF Main Sub C2- AAT3169 COUT 1µF D1 D2 D3 D4 D5 D6 D1 D2 D3 EN/SET EN/SET D4 D5 D6 3169.2008.03.1.3 www.analogictech.com 1 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Pin Descriptions Pin # AAT3169ISN AAT3169IFP Symbol 1 2 3 2 3 n/a D6 EN/SET N/C 4 6 OUTCP 5 6 7 8 9, 11 10 12 13 14 15 16 EP 7 4 5 8 10 9 11 12 13 14 1 n/a C2+ C1+ C1C2GND IN D1 D2 D3 D4 D5 Function Current sink input #6. AS2Cwire serial interface control pin. No connection. Charge pump output to drive load circuit. Requires 1µF capacitor connected between this pin and ground. Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-. Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-. Flying capacitor 1 negative terminal. Flying capacitor 2 negative terminal. Ground. Input power supply. Requires 1µF capacitor connected between this pin and ground. Current sink input #1. Current sink input #2. Current sink input #3. Current sink input #4. Current sink input #5. Exposed paddle (bottom); connect to ground as closely as possible to the package. Pin Configuration QFN44-16 (Top View) 13 15 14 D4 16 D2 D3 D5 D6 1 12 D1 EN/SET 2 11 GND N/C 3 10 OUTCP 4 9 IN GND D5 D6 EN/SET C1+ C1OUTCP C2+ 1 14 2 13 3 12 4 11 5 10 6 9 7 8 D4 D3 D2 D1 GND IN C2- 8 7 6 5 C2C1- C1+ C2+ 2 STDFN33-14 (Top View) www.analogictech.com 3169.2008.03.1.3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Absolute Maximum Ratings1 Symbol VIN VEN/SET IOUT2 TJ TLEAD Description Input Voltage to GND EN/SET Voltage to GND Maximum DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec) Value Units -0.3 to 6 -0.3 to VIN + 0.3 210 -40 to 150 300 V V mA °C °C Value Units Thermal Information3 Symbol Description PD Maximum Power Dissipation θJA Maximum Thermal Resistance QFN44-164 STDFN33-144 QFN44-16 STDFN33-14 2.0 50 -40 to 150 W V °C/W °C 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Based on long-term current density limitation. 3. Mounted on an FR4 board. 4. Derate 20mW/°C above 25°C. 3169.2008.03.1.3 www.analogictech.com 3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Electrical Characteristics1 CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C, VIN = 3.6V. Symbol Description Conditions Input Power Supply Operation Range VIN ICC ISHDN IDX Min Typ 2.7 Operating Current Shutdown Current Current Accuracy Low Current Accuracy I(D-Match) Current Matching2 1X to 1.5X or 1.5X to 2X Transition VTH Threshold at Any ISINK Pin Charge Pump Section TSS Soft-Start Time FCLK Clock Frequency EN/SET VEN(L) Enable Threshold Low VEN(H) Enable Threshold High TEN/SET LO EN/SET Low Time TEN/SET_HI_MIN Minimum EN/SET High Time TEN/SET_HI_MAX Maximum EN/SET High Time TOFF EN/SET Off Timeout EN/SET Latch Timeout TLAT IEN/SET EN/SET Input Leakage 1X Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load Current, High Current Mode 1.5X Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load Current, High Current Mode 2X Mode, 3.0 ≤ VIN ≤ 5.5, Active, No Load Current, High Current Mode 1X Mode, 3.0 ≤ VIN ≤ 5.5, D6 Active, No Load Current, Low Current Mode VEN/SET = 0V ISET = 20mA, TA = 25°C ISET = 2.4mA, TA = 25°C ISET = 400µA, TA = 25°C VF:D1:D6 = 3.6V Units 5.5 V 0.3 mA 1 1 65 90 µA µA 0.5 1 10 20 20 1 -10 -20 -20 ISET = 20mA VIN = 2.7V VIN = 5.5V Max % 150 mV 100 1000 µs kHz 0.4 1.4 0.3 75 50 -1 % 75 500 500 1 V V µs ns µs µs µs µA 1. The AAT3169 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. Current matching is defined as the deviation of any sink current from the average of all active channels. 4 www.analogictech.com 3169.2008.03.1.3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Typical Characteristics CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted. Turn-On to 1X Mode Efficiency vs. Supply Voltage (VIN = 4.2V; 20mA/Channel) 100 4.9mA/ch VF = 2.9V 10.9mA/ch VF = 3.1V 20mA/ch VF = 3.4V EN (2V/div) Efficiency (%) 90 80 CP (2V/div) VSINK (500mV/div) 70 60 IIN (200mA/div) 50 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 Time (100µs/div) Supply Voltage (V) Turn-On to 1.5X Mode Turn-On to 2X Mode (VIN = 3.8V; 20mA/Channel) (VIN = 2.8V; 20mA/Channel) EN (2V/div) EN (2V/div) CP (2V/div) VSINK (500mV/div) CP (2V/div) VSINK (500mV/div) IIN (200mA/div) IIN (200mA/div) Time (100µs/div) Time (100µs/div) Turn-Off from 1.5X Mode Current Matching vs. Temperature (VIN = 3.5V; 20mA/Channel) 20.2 Channel 1 Channel 2 EN (2V/div) Current (mA) 20.0 VF (1V/div) IIN (100mA/div) 19.8 Channel 5 19.6 Channel 3 19.4 Channel 4 Channel 6 19.2 -40 0 20 40 60 80 Temperature (°°C) Time (100µs/div) 3169.2008.03.1.3 -20 www.analogictech.com 5 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Typical Characteristics CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted. Load Characteristics Load Characteristics (VIN = 3.8V; 1.5X Mode; 15mA/Channel) (VIN = 2.9V; 2X Mode; 15mA/Channel) VIN (40mV/div) VIN (40mV/div) CP (40mV/div) CP (40mV/div) VSINK (40mV/div) VSINK (40mV/div) Time (500ns/div) Time (500ns/div) Load Characteristics Load Characteristics (VIN = 4.0V; 1.5X Mode; 20mA/Channel) (VIN = 3.1V; 2X Mode; 20mA/Channel) VIN (40mV/div) VIN (40mV/div) CP (40mV/div) CP (40mV/div) VSINK (40mV/div) VSINK (40mV/div) Time (500ns/div) Time (500ns/div) Load Characteristics Load Characteristics (VIN = 4.3V; 1.5X Mode; 30mA/Channel) (VIN = 3.6V; 2X Mode; 30mA/Channel) VIN (40mV/div) VIN (40mV/div) CP (40mV/div) CP (40mV/div) VSINK (40mV/div) VSINK (40mV/div) Time (500ns/div) 6 Time (500ns/div) www.analogictech.com 3169.2008.03.1.3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Typical Characteristics CIN = COUT = C1 = C2 = 1.0µF, VIN = 3.6V, TA = 25°C, unless otherwise noted. TLAT vs. VIN TOFF vs. VIN 350 400 350 300 -40°C -40°C 300 TOFF (µ µs) TLAT (µ µs) 250 200 150 25°C 85°C 100 250 200 25°C 150 85°C 100 50 50 0 0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V) VIN (V) Input Ripple vs. VIN VIH vs. VIN 1.2 25 1 -40°C 0.9 15 10 VIH (V) Amplitude (mV) 1.1 30mA/ch 20 20mA/ch 0.7 25°C 0.6 85°C 0.5 10.9mA/ch 5 0.8 0.4 0.3 0.2 0 2.50 2.67 2.84 3.01 3.18 3.35 3.52 3.69 3.86 4.03 4.20 VIN (V) 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V) VIL vs. VIN 1.2 1.1 1 -40°C VIL (V) 0.9 0.8 0.7 0.6 25°C 0.5 85°C 0.4 0.3 0.2 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V) 3169.2008.03.1.3 www.analogictech.com 7 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Functional Block Diagram C1+ C1- C2+ C2- 1X, 1.5X, 2X Charge Pump IN OUTCP Soft-Start Control 1MHz Oscillator Voltage Reference Main 6 x 16 Bit ROM EN/SET AS2Cwire Interface Sub 6 x 16 Bit ROM D/A D1 D/A D2 D/A D3 D/A D4 D/A D5 D/A D6 GND Functional Description The AAT3169 is a tri-mode load switch (1X) and high efficiency (1.5X or 2X) charge pump device intended for white LED backlight applications. To maximize power conversion efficiency, an internal sensing circuit monitors the voltage required on each constant current sink input and sets the load switch and charge pump modes based on the input battery voltage and the current sink input voltage. As the battery discharges over time, the AAT3169 charge pump is enabled when any of the six current sink inputs near dropout. The charge pump initially starts in 1.5X mode. If the charge pump output droops enough for any current source output to become close to dropout, the charge pump will automatically transition to 2X mode. The AAT3169 requires only four external components: two 1µF ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1µF ceramic input capacitor (CIN), and one 0.33µF to 1µF ceramic charge pump output capacitor (COUT). The six constant current sink inputs (D1 to D6) can drive six individual LEDs with a maximum current of 30mA nominal each. Unused sink inputs should be connected to OUTCP, otherwise the part will operate only in 2X charge pump mode. The AS2Cwire serial interface enables the AAT3169 and sets the current sink magni- 8 tudes. AS2Cwire addressing allows independent control of two groups of current sink input: D1~D5 and D6. Constant Current Output Level Settings The constant current sink levels for D1 to D6 are set via the serial interface according to a logarithmic scale where each code is approximately 1.8dB lower than the previous code. In this manner, LED brightness appears linear with each increasing code count. Because the inputs D1 to D6 are true independent constant current sinks, the voltage observed on any single given input will be determined by the actual forward voltage (VF) for the LED being driven. Since the input current sinks of the AAT3169 are programmable, no PWM (pulse width modulation) or additional control circuitry is needed to control LED brightness. This feature greatly reduces the burden on a microcontroller or system IC to manage LED or display brightness, allowing the user to “set it and forget it.” With its high-speed serial interface (1MHz data rate), the input sink current of the AAT3169 can be changed successively to brighten or dim LEDs in smooth transitions (e.g., to fade-out) or in abrupt steps, giving the user complete programmability and real-time control of LED brightness. www.analogictech.com 3169.2008.03.1.3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications The 16 individual current level settings are each approximately 1.8dB apart (see Table 1). Code 1 is full scale; Code 15 is full scale attenuated by approximately 25dB; and Code 16 is reserved as a “no current” setting. Data Mean 30mA Max Mean 20mA Max Mean 15mA Max 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 30.0 29.3 27.8 25.2 22.8 20.9 18.5 16.1 13.7 10.0 9.4 7.0 4.7 3.3 1.9 0.0 20.0 19.5 18.5 17.5 15.4 14.2 12.5 10.9 9.3 8.0 6.5 4.9 3.3 2.4 1.5 0.0 15.0 14.6 13.9 12.7 11.5 10.5 9.3 8.1 7.0 6.0 4.9 3.7 2.6 1.9 1.2 0.0 Table 1: Mean Table of AAT3169 Output Current. AS2Cwire Serial Interface The current sink input magnitude on the AAT3169 is controlled by AnalogicTech’s Advanced Simple Serial Control (AS2Cwire) serial digital input. AS2Cwire adds addressing capability for multiple data registers over the Simple Serial Control™ (S2Cwire™), which is only capable of controlling a single register. The AAT3169 has four registers: Bank1, Bank2, Max Current, and Low Current. Three addresses are used to control the two registers. Address 0 addresses both registers simultaneously to allow the loading of both registers with the same data using a single write protocol. Address 1 addresses Register 1 for D1 to D5 current level settings. Address 2 addresses Register 2 for D6 current level settings. AS2Cwire relies on the number of rising edges of the EN/ SET pin to address and load the registers. AS2Cwire latches data or address after the EN/SET pin has been held high for time TLAT. Address or data is differentiated by the number of EN/SET rising edges. Since the data registers are 4 bits each, the differentiating number of pulses is 24 or 16, so that Address 0 is signified by 17 rising edges, Address 1 by 18 rising edges, and Address 2 by 19 rising edges. Data is set to any number of rising 3169.2008.03.1.3 edges between 1 and including 16. A typical write protocol is a burst of EN/SET rising edges, signifying a particular address, followed by a pause with EN/SET held high for the TLAT timeout period, a burst of rising edges signifying data, and a TLAT timeout for the data registers. Once an address is set, then multiple writes consisting of data only (without address) to the corresponding data register are allowed. Address 0 is the default address on the first rising edge after the AAT3169 has been disabled. If data is presented on the first rising edge with no prior address, both data registers are simultaneously loaded. The maximum current level is determined by the value set in Register 3, the Max Current register. Three scales are available for high operating currents with maximum current levels of 30mA, 20mA, or 15mA. Each scale maintains approximately 1.8dB steps between settings. A separate mode is available for ultra-low LED current operation. When the Max Current register (Register 3) is set to the Low Current setting, the Low Current register (Register 4) must be programmed. The two most significant bits of the Low Current register control whether or not a given bank of current sinks is enabled. The least two significant bits of the Low Current register sets the current level for both banks. For low current settings, the charge pump may be enabled if required by the battery voltage and LED forward voltage conditions, and 1X mode quiescent current is approximately 130µA for multiple channels or 65µA for Channel 6 operation only. Both banks of current sinks must be in the same high or low current mode of operation. When EN/SET is held low for an amount of time greater than TOFF, the AAT3169 enters shutdown mode and draws less than 1µA from the input. Data and Address registers are reset to 0 during shutdown. AS2Cwire Serial Interface Addressing Address EN/SET Rising Edges Data Register AAT3169 0 1 2 3 4 17 18 19 20 21 1&2: D1~D6 Current 1: D1~D5 Current 2: D6 Current 3: Max Current 4: Low Current Data Max Current 1 2 3 4 20mA 30mA 15mA Low Current (see Low Current Register for values) www.analogictech.com 9 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Low Current Register (Address 4) Auto-Disable Feature Data Main Low Current On Sub Low Current On Current 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes No No No No Yes Yes Yes Yes No No No No Yes Yes Yes Yes 115µA 175µA 280µA 400µA 115µA 175µA 280µA 400µA 115µA 175µA 280µA 400µA AAT3169 is equipped with an auto-disable feature for each LED channel. After the IC is enabled and started up, a test current of 120µA (typical) is forced through each sink channel. The channel will be disabled if the voltage of that particular SINK pin does not drop to a certain threshold. This feature is very convenient for disabling an unused channel or during an LED fail-short event. Thermal Protection The AAT3169 has a built-in thermal protection circuit that will shut down the charge pump if the die temperature rises above the thermal limit, as would be the case during a short circuit of the OUTCP pin. AS2Cwire Serial Interface Timing Address Data THI TLO TLAT TLAT EN/SET 1 Address 10 2 17 18 1 0 2... n <= 16 1 Data Reg 1 0 Data Reg 2 0 www.analogictech.com n 3169.2008.03.1.3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Applications Information Capacitor Characteristics LED Selection Although the AAT3169 is designed for driving white LEDs, the device also can be used to drive most types of LEDs with forward voltages from 2.0V to 4.7V. LED applications may include main and sub-LCD display backlighting, camera photo-flash applications, color (RGB) LEDs, infrared (IR) diodes for remotes, and other loads benefiting from a controlled output current generated from a varying input voltage. Since the D1 to D6 input current sinks are matched with negligible voltage dependence, the LED brightness will be matched regardless of the specific LED forward voltage (VF) levels. Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3169. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low equivalent series resistance (ESR), is lowest cost, has a smaller PCB footprint, and is non-polarized. Low ESR ceramic capacitors help maximize charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Equivalent Series Resistance In some instances (e.g., in high luminous output applications such as photo flash), it may be necessary to drive high-VF type LEDs. The low dropout current sinks in the AAT3169 make it capable of driving LEDs with forward voltages as high as 4.7V at full current from an input supply as low as 3.0V. Outputs can be paralleled to drive high-current LEDs without complication. ESR is an important characteristic to consider when selecting a capacitor. ESR is 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. Device Switching Noise Performance Ceramic Capacitor Materials The AAT3169 operates at a fixed frequency of approximately 1MHz to control noise and limit harmonics that can interfere with the RF operation of cellular telephone handsets or other communication devices. Back-injected noise appearing on the input pin of the charge pump is 20mV peak-to-peak, typically ten times less than inductor-based DC/DC boost converter white LED backlight solutions. The AAT3169 soft-start feature prevents noise transient effects associated with inrush currents during start-up of the charge pump circuit. Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance and are very stable over temperature. Larger capacitor values are usually composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors (i.e., greater than 2.2µF) are often available in low-cost Y5V and Z5U dielectrics, but capacitors greater than 1µF are not typically required for AAT3169 applications. 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 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 sources are programmed only for light current levels, then the capacitor size may be decreased. 3169.2008.03.1.3 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. www.analogictech.com 11 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications Ordering Information Package Marking1 Part Number (Tape and Reel)2 STDFN33-14 QFN44-16 UNXYY RVXYY AAT3169IFO-T1 AAT3169ISN-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 Information3 STDFN33-14 Detail "A" 3.000 ± 0.050 2.570 ± 0.050 Index Area 3.000 ± 0.050 1.700 ± 0.050 Top View Bottom View 0.152 REF 0.025 ± 0.025 Pin 1 Indicator (Optional) 0.210 ± 0.050 Side View R0.2 0.400 BSC 0.550 ± 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. 12 www.analogictech.com 3169.2008.03.1.3 PRODUCT DATASHEET AAT3169 SwitchRegTM High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications QFN44-16 2.400 ± 0.050 0.550 ± 0.020 0.330 ± 0.075 13 16 2.400 ± 0.050 1 4 9 8 4.000 ± 0.050 Pin 1 Identification C0.3 0.650 BSC 4.000 ± 0.050 Pin 1 Dot By Marking 5 2.280 REF Top View 0.214 ± 0.036 0.900 ± 0.100 0.025 ± 0.025 Bottom View Side View All dimensions in millimeters. 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. 3169.2008.03.1.3 www.analogictech.com 13