AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Description Pin Assignments NEW PRODUCT The AL3159 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1x), and (2x) conversion for white LED applications. The AL3159 is capable of driving nine LED channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple logic control inputs individually or in parallel for driving higher-current LEDs. Low external part counts (one 1µF flying capacitor and two 2.2µF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. AL3159 digital inputs are used to enable or disable the LED channels with a fixed default current settings at 20mA or other factory programming options available. Each output of the AL3159 is equipped with built-in protection for VOUT short circuit and auto-disable for LED short conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. A low-current shutdown feature disconnects the load from VIN to reduce quiescent current less than 1µA. The AL3159 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package. Features • • • • • • • • • • • • • VIN range: 2.7V to 5.5V Up to 93% Max Power Efficiency 1% Current Matching Accuracy Between Channels Drives up to 9 configurable Channels of LEDs Three simple logic decoding LED On/Off control inputs Low transition threshold voltage typical 150 mV Dual-Mode 1x and 2x Charge Pump 1.2 MHz Constant Switching Frequency VOUT short circuit and Thermal Protections Soft Start for reducing inrush current IQ <1µA in Shutdown Thermally-Enhanced QFN3030-20 Package: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Notes: Applications • • • Mobile Phone White LED Backlighting and Indicators PDA White LED backlighting Battery-operated Phone Main and Sub Screen White LED Backlighting 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html Typical Application Circuit AL3159 Document number: DS35048 Rev. 2 - 2 1 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS NEW PRODUCT Pin Descriptions Pin Name D8 D9 CTL1 CTL3 CTL2 PGND CN VIN CP NC Pin Number 1 2 3 4 5 6 7 8 9 10,19 VOUT 11 D1 D2 D3 D4 D5 GND D6 D7 GND 12 13 14 15 16 17 18 20 EP PAD Description Current sink input #8. Connected to VOUT when un-used. Current sink input #9. Connected to VOUT when un-used. Control Pin 1 Control Pin 3 Control Pin 2 Charge Pump Switch Ground Negative Terminal of Flying Capacitor Input Power Supply. Requires 2.2µF capacitor between this pin and ground. Positive Terminal of Flying Capacitor No-Connect Charge pump output to drive load circuit. Requires 2.2µF capacitor between this pin and ground. Current sink input #1. Connected to VOUT when un-used. Current sink input #2. Connected to VOUT when un-used. Current sink input #3. Connected to VOUT when un-used. Current sink input #4. Connected to VOUT when un-used. Current sink input #5. Connected to VOUT when un-used. Ground Current sink input #6. Connected to VOUT when un-used. Current sink input #7. Connected to VOUT when un-used. Exposed Pad (bottom). Connected to GND directly underneath the package. Functional Block Diagram AL3159 Document number: DS35048 Rev. 2 - 2 2 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Absolute Maximum Ratings (Note 2) NEW PRODUCT Symbol ESD HBM ESD MM VIN VCTL1,2,3 IOUT TJ TLEAD Notes: Description Human Body Model ESD Protection Machine Model ESD Protection Input Voltage CTL1, CTL2, CTL3 to GND Voltage Maximum DC Output Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec) Rating 2 200 -0.3 to 6 -0.3 to VIN +0.3 270 150 300 Unit KV V V V mA °C °C 2. Exceeding Absolute Maximum Ratings will cause permanent damage to the device. Recommended Operating Conditions Symbol Min Max VIN Input Voltage Parameter 2.7 5.5 V TA Operating Ambient Temperature -40 85 °C Electrical Characteristics (TA = 25°C, VIN = 3.6V, Symbol IQ ISHDN IDX ID-Match Parameter Quiescent Current Shutdown Current ISINK Current Accuracy (Note 3) Current Matching Between Any Two Current Sink Inputs (Note 4) Unit CIN = COUT = 2.2µF, C1 = 1µF Unless otherwise noted) Test Conditions 1x Mode, 3.0≤VIN≤5.5, Active, No Load Current 2x Mode, 3.0≤VIN≤5.5, Active, No Load Current CTL1, CTL2 and CTL3 = 0 Min Typ. Max 0.3 0.6 2 5 20 1 21 µA mA 1 2 % mA 19 VF: D1:D9 = 3.6V 1x mode 0.5 2 x mode 4.5 Rout Open Loop VOUT Resistance VTH 1x to 2x Transition Threshold at Any IDX = 20mA ISINK Pin Unit Ω 150 mV VHS Mode Transition Hysteresis 250 mV TSS Fsw Soft-Start Time Switching Frequency CTL1,2,3 Threshold Low CTL1,2,3 Threshold High CTL1,2,3 Off Timeout VIN Under-Voltage Lockout CTL1,2,3 Input Leakage Thermal shutdown Protection Thermal shutdown hysteresis Thermal Resistance Junction-toAmbient 100 1.2 µs MHz V V µs V µA °C °C VCTL1, 2,3 (L) VCTL1,2,3(H) TCTL1,2,3 UVLO ICTL1,2,3 TSHDN THYS θJA VIN = 2.7V VIN = 5.5V 0.4 1.4 1.8 -1 200 2.2 1 2 160 10 QFN3030-20 (Note 5) o 48 C/W Notes: 3. Determined by the average current levels of all active channels 4. Defined as the deviation of any sink current from the average of all active current channels. 5. Device mounted on FR-4 substrate, 2"*2", 2oz copper, double-sided PC board, with minimum recommended pad on top layer and 4 vias to bottom layer. AL3159 Document number: DS35048 Rev. 2 - 2 3 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Typical Performance Characteristics Turn-On to 1x Mode Turn-On to 2x Mode NEW PRODUCT CTL1,2,3 2V/div CTL1,2,3 2V/div Vout 2V/div Vout 2V/div Cp 2V/div Cp 2V/div Iin 200mA/div VIN=4.2V TA=25°C IL=20mA Iin 200mA/div VIN=3.0V TA=25°C IL=20mA 50us/div 100us/div Turn-Off from 1x Mode Turn-Off from 2x Mode VIN=4.2V TA=25°C IL=20mA CTL1,2,3 2V/div VIN=3.0V TA=25°C IL=20mA CTL1,2,3 2V/div Vout 2V/div Vout 2V/div Cp 2V/div Cp 2V/div Iin 200mA/div Iin 200mA/div 200ms/div 200ms/div Load Characteristics in 2x Mode Load Characteristics in 2x Mode Vin 200mVAC/div Vin 200mVAC/div VIN=2.7V TA=25°C IL=20mA Vout 200mVAC/div VIN=3.0V TA=25°C IL=20mA Iin 100mAAC/div 1us/div AL3159 Document number: DS35048 Rev. 2 - 2 Vout 200mVAC/div Iin 100mA/div 1us/div 4 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Typical Performance Characteristics (Continued) Channels 1 to 9 NEW PRODUCT VF=3.1V TA=25°C IL=20mA VIN=3.6V Channels 1 to 9 VIN=3.6 V TA=25°C VCTL(H) VCTL(L) VIN=3.6V AL3159 Document number: DS35048 Rev. 2 - 2 5 of 10 www.diodes.com VIN=2.7V January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Functional Description NEW PRODUCT The AL3159 is a dual-mode high efficiency charge pump (1x and 2x) device, driving nine LED channels with three simple logic control inputs, intended for white LED backlight applications. An internal comparator circuit compares the voltage at each constant current sink input against a reference voltage. To ensure maximum power efficiency, the most appropriate switching mode (1x and 2x) is automatically selected. The AL3159 requires only three external components: one 1 µF ceramic flying capacitor (C1) for the charge pump, one 2.2µF ceramic input capacitor (CIN), and one 2.2µF ceramic charge pump output capacitor (COUT). The each output channel of the AL3159 can drive nine individual LEDs with a maximum current of fixed manufacture setting (20mA or 30mA) per channel. These can be paralleled to give a total maximum output current of 270mA. CTL<3:1> LED ON/OFF CONTROL 000 001 010 011 100 101 110 111 ALL OFF LED1~LED2 ON LED3~LED5 ON LED6~LED9 ON LED9 ON LED6~LED8 ON LED1~LED5 ON ALL ON AL3159 Document number: DS35048 Rev. 2 - 2 Disabled Current Sinks Unused current channels must be disabled by connecting the sinks to VOUT with only a small sense current flowing through the disabled channel. Soft-Start Soft-start is incorporated to prevent excessive inrush current during power-up, mode switching, and transitioning out of stand-by mode. Short-Circuit Protection Short-circuit protection function is incorporated to prevent excessive load current when either flying cap terminals or output pin electrically tied to a very lower voltage or ground. Over-Voltage Protection Over-Voltage Protection function is incorporated to limit the output voltage under a safe value to avoid on-chip device breakdown. Under-Voltage Lockout Under-Voltage lockout feature disables the device when the input voltage drops below UVLO threshold. Thermal Auto Shutdown When the die temperature exceeds the thermal limit, the device will be disabled and enter stand-by mode. The operation resumes whenever the die cools off sufficiently. 6 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Ordering Information AL 3159 FS G - 7 Package FS : QFN3030-20 NEW PRODUCT Device AL3159FSG-7 Notes: Package Code FS Green G : Green Packaging (Note 7 and 8) QFN3030-20 Packing 7 : Tape & Reel Quantity 3000/Tape & Reel 7” Tape and Reel Part Number Suffix -7 7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf 8. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html Marking Information (1) QFN3030-20 (Top View) XX YWX Part Number AL3159FSG AL3159 Document number: DS35048 Rev. 2 - 2 XX : B9 : AL3159 Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Package QFN3030-20 7 of 10 www.diodes.com Identification Code B9 January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Package Outline Dimensions (All Dimensions in mm) 0.15 Typ. Package type: QFN3030-20 CL 0.10 C B 2X - 0.25 A Side View C 2.95/3.05 A 10 1.70/1.90 Pin1 1.70/1.90 0.30/0.40 5 2.95/3.05 NEW PRODUCT 0.05 Max. Seating Plane 0.57/0.63 0.08 C Pad Layout Top View 15 (Pin #1 ID) 2X- 0.25 B 20 0.40 0.16/0.26 0.10 C A B 0.595 Typ. Bottom View AL3159 Document number: DS35048 Rev. 2 - 2 8 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS NEW PRODUCT Taping Orientation (Note 9) Notes: 9. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf AL3159 Document number: DS35048 Rev. 2 - 2 9 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3159 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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