POWER LOSS (mW) LTC3526/LTC3526B 500mA 1MHz Synchronous Step-Up DC/DC Converters NOT RECOMMENDED FOR NEW DESIGNS in 2mm 2mm DFN Contact Linear Technology for Potential Replacement Fae Tseru Dpircse Tnoi n Delivers 3.3V at 100mA from a Single Alkaline/ The LTC 3526/LTC3526B are synchronous, fixed frequency NiMH Cell or 3.3V at 200mA from Two Cells step-up DC/DC converters with output disconnect. Syn- n V Start-Up Voltage: 850mV chronous rectification enables high efficiency in the low IN n 1.6V to 5.25V V Range profile 2mm 2mm DFN package. Battery life in single OUT n Up to 94% Efficiency AA/AAA powered products is extended further with an n Output Disconnect 850mV start-up voltage and operation down to 500mV n 1MHz Fixed Frequency Operation once started. n V > V Operation IN OUT A switching frequency of 1MHz minimizes solution foot- n Integrated Soft-Start print by allowing the use of tiny, low profile inductors and n Current Mode Control with Internal Compensation ceramic capacitors. The current mode PWM design is n Automatic Burst Mode Operation with 9A internally compensated, reducing external parts count. The Quiescent Current (LTC3526) LTC3526 features automatic Burst Mode operation at light n Low Noise PWM Operation (LTC3526B) load conditions, while the LTC3526B features continuous n Internal Synchronous Rectifier switching at light loads. Anti-ringing control circuitry also n Logic Controlled Shutdown (I < 1A) Q reduces EMI concerns by damping the inductor in discon- n Anti-Ringing Control tinuous mode. Additional features include a low shutdown n Low Profile (2mm 2mm 0.75mm) DFN Package current of under 1A and thermal shutdown. The LTC3526/LTC3526B are housed in a 2mm 2mm a acilpp Tsnoi 0.75mm DFN package. n Medical Instruments For new designs, we recommend the LTC3526L/LTC3526LB. n Flash-Based MP3 Players L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Noise Canceling Headphones and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Wireless Mice n Bluetooth Headsets T lacipy a acilpp Tnoi LTC3526 Efficiency and Power Loss vs Load Current 100 1000 V = 2.4V IN 90 EFFICIENCY 4.7H 80 100 70 SW V OUT 60 10 V IN V V 3.3V IN OUT 1.6V TO 3.2V 50 200mA 1F LTC3526 POWER LOSS 1.78M 40 1 OFF ON SHDN FB 4.7F 30 GND 1M 20 0.1 3526 TA01a 10 0 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 3526 TA01b 3526bfd EFFICIENCY (%)LTC3526/LTC3526B a ulosb T e m mumixa r a Tsgni p ni c no Farugi Tnoi (Note 1) TOP VIEW V Voltage ................................................... 0.3V to 6V IN SW Voltage SW 1 6 V OUT DC ............................................................ 0.3V to 6V GND 2 7 5 FB Pulsed <100ns ......................................... 0.3V to 7V V 3 4 SHDN IN SHDN, FB Voltage ........................................ 0.3V to 6V V ............................................................. 0.3V to 6V DC PACKAGE OUT 6-LEAD (2mm 2mm) PLASTIC DFN Operating Temperature Range (Note 2) ...40C to 85C T = 125C, = 102C/W (NOTE 6) JMAX JA Storage Temperature Range .................. 65C to 150C EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PC BOARD o r D re i n Famro Tnoi LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3526EDC PBF LTC3526EDC TRPBF LCHW 6-Lead (2mm 2mm) Plastic DFN 40C to 85C LTC3526BEDC PBF LTC3526BEDC TRPBF LCNN 6-Lead (2mm 2mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: