Advanced Analog Technology, Inc. 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 General Description Features The AAT1500 is a step-up converter that provides a solution to drive 1 to 4 white LEDs with a constant current from a Lithium Ion cell, and its switching frequency is fixed at 1 MHz. Up to 4 LEDs at 2.8V Supply High Efficiency (85%) Output Over Voltage Protection HV Internal Switch 1 MHz PWM Switching Frequency The AAT1500 offers a low 0.25V reference, which minimizes power loss in the current setting resistor and improves efficiency. Protection feature includes output over voltage protection. The AAT1500 consists of a 0.1µA shutdown current, and HV internal switch. Input supple range allows operation from 2.6V to 6V. Uses Tiny 1 mm Height Inductor 2.6V to 6V Input Range 0.1µA Shutdown Current SOT-26 & VQFN-8 Package Available The AAT1500 is available in 6-pin SOT-26 and 8-pin VQFN-8 package. Pin Configuration TOP VIEW TOP VIEW SW 1 6 VDD GND 2 5 OVP IE 3 4 EN Applications 1 8 SW VDD 2 7 GND1 OVP EN 3 6 IE GND 4 5 NC SOT-26 PACKAGE Palmtops MP3 Player Digital Still Cameras Portable Media Player Cell Phones and Smart Phones Electronic Information Organizers VQFN-8 PACKAGE – – – Advanced Analog Technology, Inc. – Page 1 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Pin Description PIN NO SOT-26 1 PIN NO VQFN-8 8 2 NAME I/O DESCRIPTION SW O Switch Pin 4 GND - Ground 3 6 IE I Inverting Input Pin of Error Amplifier 4 3 EN I Chip Enable/Disable(Active High) 5 1 OVP I Over Voltage Protection 6 2 VDD - Supply Voltage - 7 5 GND1 NC - SW MOS Ground NC Absolute Maximum Ratings (Note 1) CHARACTERISTICS SYMBOL VDD VALUE − 0.3 to 7 UNIT SW, OVP to GND − 0.3 to 21 V Other I/O Pin Voltage − 0.3 to 6 V Junction Temperature 125 o − 45 to 125 o − 40 to 85 o TL 260 o SYMBOL VDD VALUE UNIT 2.6 to 6 V SYMBOL θ JA VALUE UNIT Supply Voltage Tstorage Storage Temperature Range TC Operating Temperature Range Lead Temperature V C C C C Recommended Operating Conditions CHARACTERISTICS Supply Voltage Dissipation Ratings CHARACTERISTICS Package Thermal Resistance Power Dissipation, TC = 25 oC – PACKAGE SOT-26 208 o 50 o C/W VQFN-8 θ JA SOT-26 Pd 0.48 W VQFN-8 Pd 2 W C/W – – Advanced Analog Technology, Inc. – Page 2 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Electrical Characteristics, VDD = 3.6 V, TC = 25 oC (Unless Otherwise Specified) Operating Condition PARAMETER SYMBOL Supply Voltage Under Voltage Lockout TEST CONDITION MIN TYP MAX UNIT VDD 2.6 6.0 V VUVLO 1.8 2.3 V 2 mA 2.2 Operating Current I DD VDD = 5.5V, Switch On Quiescent Current IQ VDD = 5.5V VFB = 1.3V, Switch Off 250 500 µA Shutdown Current I SD VDD = 5.5V, VEN < 0.4V 0.1 1 µA Oscillator PARAMETER Operating Frequency SYMBOL f OSC TEST CONDITION Maximum Duty Cycle D MAX Reference Voltage PARAMETER SYMBOL VIE Feedback Voltage N-Channel Switch PARAMETER Current Limit SYMBOL I LIM 79 TEST CONDITION Note 2 TEST CONDITION R ON On-Resistance I SWOFF Leakage Current Control and Protection PARAMETER SYMBOL EN pin Current I EN OVP Threshold VOVP Chip Enable/Disable – MIN 0.8 MIN Chip Enable VENL Chip Disable 92 TYP MAX UNIT V TYP MAX UNIT A 0.75 0.90 0.50 0.75 1.00 Ω 0.01 20.00 µA MIN 0.4 TYP MAX UNIT 4 6 µA 15.5 20.0 V 0.8 1.4 V 0.8 V – – Advanced Analog Technology, Inc. – Page 3 of 11 % MIN 0.60 14.5 VENH 85 0.237 0.250 0.263 VSW = 12V TEST CONDITION TYP MAX UNIT 1.0 1.2 MHz V 0.2 Advanced Analog Technology, Inc. AAT1500 Note 1. 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. Note 2. 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. Block Diagram SOT-26 and VQFN-8 OVP Bandgap Soft-Start 0.25V VBG VDD UVLO OVP EN IE SW 0.25V VBG Control Logic GND/ Driver Current Sense Oscillator – – – Advanced Analog Technology, Inc. – Page 4 of 11 V 0.2 GND1 Advanced Analog Technology, Inc. AAT1500 Application Circuit SOT-26 L VIN VIN D1 V VOUT 2.6V~6V C1 VDD VDD SSW W EEN N OOVP VP GGND N D IIE E VQFN-8 L VIN VIN D1 V VOUT 2.6V~6V C1 VDD VDD SW S W EN E N GND1 G N D GND – OVP O VP IE IE NC – – Advanced Analog Technology, Inc. – Page 5 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Package Dimensions SOT-26 – – – Advanced Analog Technology, Inc. – Page 6 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Package Dimensions SOT-26(Cont.) VARIATION (ALL DIMENSIONS SHOWN IN MILLIMETERS) SYMBO L MIN TYP MAX A ------ ------ 1.45 A1 ------ ------ 0.15 A2 0.90 1.15 1.30 b 0.30 ------ 0.50 c 0.08 ------ 0.22 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.95 BSC e1 1.90 BSC L 0.30 0.45 L1 0.60 REF L2 0.25 BSC 0.60 R 0.10 ------ ------ R1 0.10 ------ 0.25 0o 4o 10 o 8o θ θ1 5o 15 o NOTE: 1 JEDEC OUTLINE: MO-178 AB – – – Advanced Analog Technology, Inc. – Page 7 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Tape and Reel SOT-26 Packing Method: 3,000pcs/reel, 5 reels/box – – – Advanced Analog Technology, Inc. – Page 8 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Tape and Reel SOT-26(Cont.) X.XXX X ± 0.0025 X.XXX ± 0.006 X.XX ± 0.025 X.X ± 0.10 X ± 0.25 UNIT: MILLIMETERS – – – Advanced Analog Technology, Inc. – Page 9 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Part Marking SOT-26 TOP MARKING XXX VQFN-8 TOP MARKING XXX NOTE: BOTH SOT-26 AND VQFN-8 HAVE NO BACK MARKING. – – – Advanced Analog Technology, Inc. – Page 10 of 11 V 0.2 Advanced Analog Technology, Inc. AAT1500 Package Dimensions VQFN-8 $ ###### ! ###### – " ###### % " ! – – Advanced Analog Technology, Inc. – Page 11 of 11 V 0.2