AL3158 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Description Pin Assignments NEW PRODUCT The AL3158 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 AL3158 is capable of driving three groups of three LED channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple PWM dimming inputs individually or in parallel for driving highercurrent 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. AL3158 PWM dimming inputs are used to enable, disable device and dimming LED current with a fixed default current settings at 20mA or other factory programming options available. Each output of the AL3158 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 AL3158 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package. Applications Features • • • • • • • • • • • • • • • • • VIN Range: 2.7V to 5.5V Up to 93% Max Power Efficiency 1% Current Matching Accuracy Between Channels Three simple PWM dimming for RGB or WLED Low transition threshold voltage typical 150 mV Dual-Mode 1x and 2x Charge Pump Drives up to 3 + 3 + 3 Channels of LEDs 1.2 MHz Constant Switching Frequency VOUT short circuit and Thermal Protections Soft Start for reducing inrush current Under Voltage Lockout Protection 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: 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 8 VIN VIN CP 2.2uF CIN CN AL3158 VOUT 9 1uF C1 7 EN2 3 5 D1 D2 D3 D4 EN1 EN2 EN3 EN2 11 D1 LED EN1 EN1 D2 LED D3 LED D4 LED D5 LED D6 LED D7 LED D8 LED D9 LED 2.2uF COUT 12 13 14 15 D5 16 EN3 4 D6 18 EN3 20 PGND 6 AL3158 Document number: DS35047 Rev. 2 - 2 D7 1 D8 2 D9 GND 17 1 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS NEW PRODUCT Pin Descriptions Pin Name D8 D9 EN1 EN3 EN2 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 D6 GND D7 GND 12 13 14 15 16 18 17 20 EP PAD Description Current sink input #8. Connected to VOUT when un-used. Current sink input #9. Connected to VOUT when un-used. Enable Pin 1 Enable Pin 3 Enable 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. Current sink input #6. Connected to VOUT when un-used. Ground Current sink input #7. Connected to VOUT when un-used. Exposed Pad (bottom). Connected to GND directly underneath the package. Functional Block Diagram AL3158 Document number: DS35047 Rev. 2 - 2 2 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Absolute Maximum Ratings (Note 2) NEW PRODUCT Symbol ESD HBM ESD MM VIN VEN1,2,3 IOUT TJ TLEAD Notes: Description Human Body Model ESD Protection Machine Model ESD Protection Input Voltage EN1, EN2, EN3 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 EN1, EN2, EN3 = 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 EN1,2,3 Threshold Low EN1,2,3 Threshold High EN1,2,3 Off Timeout VIN Under-Voltage Lockout EN1,2,3 Input Leakage Thermal shutdown Protection Thermal shutdown hysteresis Thermal Resistance Junction-toAmbient 100 1.2 µs MHz V V ms V µA °C °C VEN1, 2,3 (L) VEN1,2,3(H) TEN1,2,3 UVLO IEN1,2,3 TSHDN THYS θJA VIN = 2.7V VIN = 5.5V 0.4 1.4 1.8 -1 2 160 10 QFN3030-20 (Note 5) 52 20 2.2 1 o C/W Notes: 3. Determined by the average current levels of all active channels. 4. Determined by the maximum sink current (MAX), the minimum sink current (MIN), and the average sink current (AVG). Two matching numbers are calculated as (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered as the matching data. 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. AL3158 Document number: DS35047 Rev. 2 - 2 3 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Typical Performance Characteristics NEW PRODUCT Turn-On to 1x Mode Turn-On to 2x Mode EN1,2,3 2V/div EN1,2,3 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 VIN=3.0V TA=25°C IL=20mA EN1,2,3 2V/div EN1,2,3 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 PWM Dimming Control (Duty Cycle=50%) Vin 200mVAC/div EN 3.6V/div Idx 50mA/div VIN=3.0V TA=25°C IL=20mA Vout 200mVAC/div Iin 100mAAC/div VIN=3.6V Freq=20kHz Duty Cycle=50% Document number: DS35047 Rev. 2 - 2 Iin 100mA/div 10us/div 1us/div AL3158 TA=25°C 4 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 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 VEN(H) VEN(L) VIN=3.6V AL3158 Document number: DS35047 Rev. 2 - 2 5 of 10 www.diodes.com VIN=2.7V January 2011 © Diodes Incorporated AL3158 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Functional Description NEW PRODUCT The AL3158 is a dual-mode high efficiency charge pump (1x and 2x) device, driving three groups of three LED channels at 30mA maximum each, 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 AL3158 requires only three external components: one 1µF 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 AL3158 can drive three groups of three individual LED channels with a maximum current of fixed manufacture setting (20mA or 30mA) per channel. These can be paralleled to give a total output current of 270mA. EN<3:1> LED ON/OFF CONTROL XX0 XX1 X0X X1x 0XX 1xX LED1~LED3 OFF LED1~LED3 ON LED4~LED6 OFF LED4~LED6 ON LED7~LED9 OFF LED7~LED9 ON 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. 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. PWM Dimming Control Unused current channels must be disabled by connecting the sinks to VOUT with only a small sense current flowing through the disabled channel. Document number: DS35047 Rev. 2 - 2 Soft-start is incorporated to prevent excessive inrush current during power-up, mode switching, and transitioning out of stand-by mode. Thermal Auto Shutdown Disabled Current Sinks AL3158 Soft-Start The AL3158 provides simple PWM dimming control through ENx pins, and the current is adjusted by the duty cycle of the signal applied on ENx pin. The recommended PWM frequency is from 200Hz to 50KHz depending on applications. 6 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 HIGH EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS Ordering Information AL 3158 FS G - 7 NEW PRODUCT Package FS : QFN3030-20 Device AL3158FSG-7 Notes: Package Code FS Green G : Green Packing 7 : Tape & Reel 7” Tape and Reel Quantity Part Number Suffix 3000/Tape & Reel -7 Packaging (Note 7 and 8) QFN3030-20 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 AL3158 Document number: DS35047 Rev. 2 - 2 XX : B8 : AL3158 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 Part Number Package Identification Code AL3158FSG QFN3030-20 B8 7 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 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 AL3158 Document number: DS35047 Rev. 2 - 2 8 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 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 AL3158 Document number: DS35047 Rev. 2 - 2 9 of 10 www.diodes.com January 2011 © Diodes Incorporated AL3158 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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