AAT3114ISN-20-T1

High Efficiency 1.5X Fractional Charge Pumps For White LED Applications General Description The AAT3113 and AAT3114/14A are low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low external parts count (two 1µF flying capacitors and two small bypass capacitors at VIN and OUT) makes these devices ideally suited for small, battery-powered applications. AnalogicTech’s Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. AAT3113 and AAT3114/14A devices have a thermal management system for protection in the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high switching frequency enables the use of small external capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA. The AAT3113 provides four LED current source outputs, and the AAT3114/14A provides six. The AAT3113 is available in a Pb-free 12-pin TSOPJW package, and the AAT3114/14A is available in a Pb-free 16-pin QFN package. AAT3113, AAT3114/14A ChargePump™ Features • • • • • • • • • • • • • • • • • AAT3113: Four Outputs AAT3114/14A: Six Outputs 20mA Full-Scale Current Simple Serial Control (S2Cwire) Interface — 32-Position Logarithmic Scale with Digital Control Low Noise Constant Frequency Operation 33% Less Input Current Than Doubler Charge Pump High Accuracy Brightness Matching Small Application Circuit Regulated Output Current Automatic Soft Start VIN Range: 2.7V to 5.5V No Inductors 600kHz Switching Frequency IQ 50ns 300ns < TLO < 75μs 50ns minimum to enable ON/1 2 3 4 5 6 n (n < =32) OFF Enable / Disable / LED Brightness Level Set Data Input 12 3113.2006.07.1.9 High Efficiency 1.5X Fractional Charge Pumps For White LED Applications Driving white LED display module backlights and individual white LEDs connected in parallel: The AAT3114/14A D1 to D6 outputs are true constant current sources capable of driving up to 20mA each over the operation input voltage range. Since these outputs are true constant current sources, they may be connected in parallel to drive a single power output. Any combination of outputs (D1 to D6) may be connected in parallel. The maximum total output current is a sum of parallel-connected current sources. This feature is particularly useful to power pre-manufactured display modules that are pre-wired with white LED backlights connected in a parallel circuit configuration. All outputs can be connected in parallel to drive groups of LEDs as well. The internal current source reference circuit bases feedback from current sensed on the D1 output. For best operation, the only requirement for this application is that the output D1 should always be connected to the load circuit. AAT3113, AAT3114/14A AAT3114/14A Application Driving a Display Module With Six Parallel-Connected White LEDs: VIN C1+ C1 1μF OUT V BATTERY CIN 1μF COUT 1μF C1C2+ C2 1μF AAT3114/14A C2D1 D2 D3 D4 D5 D6 Display Module D1 D2 D3 D4 D5 D6 EN/SET EN/SET GND R1 R2 R3 R4 R5 R6 Resistor R is optional AAT3114/14A Dual Backlight Control Circuit: VIN C1+ C1 1μF OUT V BATTERY CIN 1 μF COUT 1μF C1C2+ C2 1μF AAT3114/14A C2D1 D2 D3 D4 D5 D6 Keyboard Backlight Display Backlight D4 D1 D2 D3 D5 D6 EN/SET EN/SET GND Enable Keyboard Backlight Enable Display Backlight 3113.2006.07.1.9 13 High Efficiency 1.5X Fractional Charge Pumps For White LED Applications Ordering Information Package TSOPJW-12 QFN44-16 QFN44-16 AAT3113, AAT3114/14A Marking1 HTXYY FGXYY OVXYY Part Number (Tape and Reel)2 AAT3113ITP-20-T1 AAT3114ISN-20-T1 AAT3114AISN-20-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/pbfree. Package Information QFN44-16 0.600 ± 0.050 Pin 1 Dot By Marking 0.330 ± 0.050 13 16 Pin 1 Identification 0.650 BSC 1 4.000 ± 0.050 R0.030Max 9 4 8 5 4.000 ± 0.050 2.280 REF Top View Bottom View 2.400 ± 0.050 0.0125 ± 0.0125 0.203 ± 0.025 Side View All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on all part numbers listed in BOLD. 14 0.900 ± 0.050 0.450 ± 0.050 3113.2006.07.1.9 High Efficiency 1.5X Fractional Charge Pumps For White LED Applications TSOPJW-12 + 0.10 - 0.05 AAT3113, AAT3114/14A 0.20 2.40 ± 0.10 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 2.85 ± 0.20 7° NOM 3.00 ± 0.10 0.9625 ± 0.0375 0.04 REF + 0.10 1.00 - 0.065 0.055 ± 0.045 4° ± 4° 0.010 0.15 ± 0.05 0.45 ± 0.15 2.75 ± 0.25 All dimensions in millimeters. © 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. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. 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. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 3113.2006.07.1.9 15