Advanced Analog Technology, Inc. July 2008 AAT1500 Product information presented is current as of publication date. Details are subject to change without notice CONSTANT CURRENT BOOST CONVERTER FOR 1 TO 4 WHITE LEDS FEATURES GENERAL DESCRIPTION Up to 4 LEDs at 2.8V Supply The AAT1500 is a step-up converter that provides a High Efficiency (85%) solution to drive 1 to 4 white LEDs with a constant Output Over Voltage Protection current from a lithium cell, and its switching frequency is HV Internal Switch fixed at 1 MHz. 1 MHz PWM Switching Frequency The AAT1500 offers a low 0.25V reference, which Uses Tiny 1 mm Height Inductor 2.6V to 6V Input Range 0.1µA Shutdown Current SOT23-5 , SOT23-6,TSOT23-6, and VSON8 minimizes power loss in the current setting resistor and improves efficiency. Except in SOT23-5 package, protection Packages Available features include output over voltage protections. The AAT1500 consists of a 0.1µA shutdown current, and HV internal switch. Input supply range allows operation from 2.6V to 6V. The AAT1500 is available in SOT23-5, SOT23-6, APPLICATIONS TSOT23-6 and VSON8 packages. Palmtops MP3 Player Digital Still Cameras Portable Media Player Cell Phones and Smart Phones Electronic Information Organizers PIN CONFIGURATION TYPICAL APPLICATION V R1 = IE IR1 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 1 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 ORDERING INFORMATION DEVICE TYPE PART NUMBER AAT1500 AAT1500 -S5-T AAT1500 AAT1500 -S3-T AAT1500 AAT1500 -S13-T AAT1500 AAT1500 -Q6-T PACKAGE PACKING TEMP. RANGE MARKING MARKING DESCRIPTION T: Tape and Reel −40 ° C to 85 ° C │1500 Device Type T: Tape and Reel −40 ° C to 85 ° C │1500 Device Type T: Tape and Reel −40 ° C to 85 ° C │1500 Device Type T: Tape and Reel −40 ° C to +85 ° C 1500 Device Type S5:SOT 23-5 (SOT25) S3:SOT 23-6 (SOT26) S13:TSOT 23-6 (TSOT26) Q6:VSON 8-2.2*2.2 ABSOLUTE MAXIMUM RATINGS CHARACTERISTICS SYMBOL VALUE UNIT VDD −0.3 to 7 V SW, OVP to GND −0.3 to 21 V Other I/O Pin Voltage −0.3 to 6 V Junction Temperature 125 °C TSTORAGE −45 ° C to +125 ° C °C Operating Temperature Range TC −40 ° C to +85 ° C °C Lead Temperature TL 260 ° C °C Supply Voltage Storage Temperature Range Note: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended period of time may affect device reliability. RECOMMENDED OPERATING CONDITIONS CHARACTERISTICS SYMBOL VALUE UNIT VDD 2.6 to 6 V Supply Voltage – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 2 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 DISSIPATION RATINGS CHARACTERISTICS PACKAGE SYMBOL VALUE UNIT SOT23-6 θJA 208 ° C /W VSON8 θJA 50 ° C /W SOT23-6 Pd 0.48 W VSON8 Pd 2 W Package Thermal Resistance Power Dissipation, TC = 25 ° C ELECTRICAL CHARACTERISTICS ( VDD = 3.6 V, TC = 25 ° C , unless otherwise specified.) Operating Condition PARAMETER SYMBOL MIN MAX UNIT 4.5 V 2.3 V 2 mA 250 500 µA 0.1 1 µA MIN TYP MAX UNIT VDD 2.6 VUVLO 1.8 Supply Voltage Under Voltage Lockout TEST CONDITION Operating Current IDD Quiescent Current IQ Shutdown Current ISD TYP 2.2 VDD = 5.5V, Switch on VDD = 5.5V VFB = 1.3V, Switch off VDD = 5.5V, VEN < 0.4V Oscillator PARAMETER SYMBOL TEST CONDITION Operating Frequency fOSC 0.8 1.0 1.2 MHz Maximum Duty Cycle DMAX 79 85 92 % MIN TYP MAX UNIT 0.237 0.250 0.263 V Reference Voltage PARAMETER SYMBOL VIE Feedback Voltage TEST CONDITION Note Note: To measure the feedback voltage, the device VIE would connect to the application circuit. The inductance is 10 µH and the output voltage equals 12V. – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 3 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 ELECTRICAL CHARACTERISTICS ( VDD = 3.6 V, TC = 25 ° C , unless otherwise specified.) N-Channel Switch PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT Current Limit ILIM 0.60 0.75 0.90 A On-Resistance RON 0.50 0.75 1.00 Ω 0.01 20.0 µA TYP MAX UNIT 4 6 µA 15.5 20.0 V 0.8 1.4 V Leakage Current ISWOFF VSW = 12V Control and Protection PARAMETER SYMBOL EN pin Current IEN OVP Threshold VOVP Chip Enable/Disable TEST CONDITION 14.5 VENH Chip Enable VENL Chip Disable – – MIN 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 4 of 14 0.4 0.8 V Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL OPERATING CHARACTERISTICS Typical Application μ L1 4.7 H D1 μ Efficiency vs. VO 92% 90% AAT1500 D2 LED D3 LED D4 LED C2 10 F VIN : 2.6V~5.5V 88% 1 2 SW VDD 6 86% μ C1 10 F OVP 5 GND 84% 82% 3 IE EN 4 80% Ω R1 12.4 78% 76% 3.5 9.5 12.5 VO (V) Efficiency vs. LED Current Efficiency vs. VIN 94% 92% 90% 88% 86% 84% 82% 80% 78% 76% 6.5 95% 2-LED 1-LED 90% 1-LED 85% 3-LED 80% 3-LED 4-LED 2-LED 75% 4-LED 70% 65% 60% 2.5 3 3.5 4 4.5 5 0 5.5 5 15 20 25 30 LED Current (mA) VIN (V) 22.5 10 LED Current vs. VIN LED Current vs. VO 22 21.5 22 21 21.5 20.5 21 20 20.5 19.5 20 19 19.5 18.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 3 4 5 6 7 8 VO (V) VIN (V) – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 5 of 14 9 10 11 Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL OPERATING CHARACTERISTICS °C – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 6 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 PIN DESCRIPTION PIN NO SOT23-5 PIN NO SOT23-6 PIN NO TSOT23-6 PIN NO VSON8 NAME I/O 1 1 1 8 SW O Switch Pin 2 2 2 4 GND - Ground 3 3 3 6 IE I Inverting Input Pin of error amplifier 4 4 4 3 EN I Chip Enable/Disable(Active High) - 5 5 1 OVP I Over Voltage Protection 5 6 6 2 VDD - Supply Voltage - - - 7 GND1 - SW MOS Ground - - - 5 NC - Not Connected FUCTION BLOCK DIAGRAM SOT23-5 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 7 of 14 DESCRIPTION Advanced Analog Technology, Inc. July 2008 AAT1500 FUCTION BLOCK DIAGRAM SOT23-6 and TSOT23-6 VSON8 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 8 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL APPLICATION CIRCUIT SOT23-5 R1 = VIE IR1 SOT23-6 and TSOT23-6 V R1 = IE IR1 VSON8 R1 = – – 台灣類比科技股份有限公司 – VIE IR1 Advanced Analog Technology, Inc. – Version 1.00 Page 9 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 TYPICAL APPLI CATION CIRCUIT CLK D R1 = V − VDS VIE , R 2 = IE IR1 IR 2 S VIE = 0.25 V ( typical) VDS = RDS( ON) × IR2 (MOSFET Spec.) – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 10 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION SOT23-5(SOT25) Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ θ1 Dimensions In Millimeters MIN TYP MAX 1.05 1.20 1.35 ----------0.15 1.0 1.1 1.2 0.3 -----0.5 0.08 -----0.2 2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.35 0.45 0.55 0.60 REF 0.25 BSC 0.1 ----------0.10 -----0.25 0 5 10 3 10 7 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 11 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION SOT23-6(SOT26) SYMBOL A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ θ1 Dimensions In Millimeters MIN TYP MAX 1.35 1.05 1.2 0.15 ----------1 1.1 1.2 0.4 0.55 -----0.08 0.2 -----2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.35 0.45 0.55 0.60 REF 0.25 BSC 0.10 ----------0.10 0.25 ------ 0 5 10 3 5 7 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 12 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION TSOT23-6 (TSOT26) Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ θ1 Dimensions In Millimeters MIN TYP MAX 0.75 -----0.9 0 -----0.1 0.7 0.75 0.8 0.4 -----0.5 0.08 -----0.2 2.8 2.9 3 2.6 2.8 3 1.5 1.6 1.7 0.95 BSC 1.90 BSC 0.3 0.45 0.6 0.60 REF 0.25 BSC 0.1 ----------0.1 -----0.25 0 4 8 4 10 12 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 13 of 14 Advanced Analog Technology, Inc. July 2008 AAT1500 PACKAGE DIMENSION VSON8 C PIN1 INDENT Chornfer:0.2 A1 D A Symbol A A1 b C D D2 E E2 e L y Dimensions In Millimeters MIN TYP MAX 0.8 0.9 1.0 0.00 0.02 0.05 0.20 0.25 0.30 0.19 0.20 0.25 2.1 2.2 2.3 1.0 1.1 1.2 2.1 2.2 2.3 1.5 1.6 1.7 -----0.55 -----0.25 0.35 0.45 0.000 -----0.076 – – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. – Version 1.00 Page 14 of 14 D2 L