POWER LOSS (mW) LTC3525D-3.3 400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode Fea T Descrip T n V Connected to V in Shutdown The LTC 3525D-3.3 is a high efficiency synchronous step- OUT IN n Up to 95% Efficiency up DC/DC converter that can start up with an input as low n 0.85V Minimum Input Start-Up Voltage as 0.85V. It offers a compact, high efficiency alternative to n Fixed Output Voltage of 3.3V charge pumps in single cell or dual cell alkaline or Li-Ion n Delivers 60mA at 3.3V from a 1V Input, applications. Only three small external components are re- or 140mA at 3.3V from a 1.8V Input quired. The LTC3525D features a fixed output voltage of 3.3V. n Burst Mode Operation: I = 7A In shutdown, V is connected to V through the inductor. Q OUT IN n V Range: 0.5V to 4.5V IN The device includes a 0.5 N-channel MOSFET switch and n Only Three External Components a 0.8 P-channel synchronous rectifier. Peak switch current n V > V Operation IN OUT ranges from 150mA to 400mA, depending on load, providing n Anti-Ringing Control enhanced efficiency. Quiescent current is an ultralow 7A, n Short-Circuit and Overtemperature Protection maximizing battery life in portable applications. n Very Low Profile of 1mm n Other features include anti-ringing control and thermal Tiny 6-Lead SC70 Package shutdown. The LTC3525D is available in a tiny 6-Lead SC70 package. a T n MP3 Players List of LTC3525 Options n Portable Instruments PART NAME INPUT START-UP OUTPUT V STATUS IN OUT n VOLTAGE VOLTAGE SHUTDOWN MODE Glucose Meters n LTC3525-3 0.85V 3V Output Disconnect Digital Cameras LTC3525-3.3 0.85V 3.3V Output Disconnect L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the LTC3525-5 0.85V 5V Output Disconnect property of their respective owners. Patents pending. LTC3525D-3.3 0.85V 3.3V Pass Through Mode LTC3525L-3 0.7V 3V Output Disconnect LTC3525D-3.3 Efficiency and Typical a T Power Loss vs Load Current L1* 100 100 10H 90 80 10 LTC3525D-3.3 EFFICIENCY V IN V SW IN 70 1.8V TO 3.2V V OUT 3.3V SHDN V 60 1 PASS THROUGH ON OUT 140mA POWER LOSS 50 GND GND 1F 10F 40 0.1 V = 3V IN 30 3525 TA01 V = 2.4V IN *MURATA LQH32CN100K53 V = 1.2V IN 20 0.01 0.01 0.1 1 10 100 1000 LOAD (mA) LT3525 TA02 3525d33fb 1 For more information www.linear.com/LTC3525D3.3 EFFICIENCY (%) ion pplica ions pplica ion ures LTC3525D-3.3 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW V , V Voltage ........................................ 0.3V to 6V IN OUT SHDN 1 6 SW SW Voltage ................................................. 0.3V to 6V GND 2 5 GND SW Voltage < 100ns .................................... 0.3V to 7V V 3 4 V IN OUT SHDN Voltage ............................................. 0.3V to 6V SC6 PACKAGE Operating Junction Temperature Range 6-LEAD PLASTIC SC70 (Notes 2, 5) ............................................ 40C to 125C T = 125C JMAX = 256C/W IN FREE AIR, = 150C/W ON BOARD OVER GROUND PLANE JA JA Storage Temperature Range .................. 65C to 125C Lead Temperature (Soldering, 10 sec) ...................300C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3525DESC6-3.3 PBF LTC3525DESC6-3.3 TRPBF LCQZ 6-Lead Plastic SC70 40C to 85C LTC3525DISC6-3.3 PBF LTC3525DISC6-3.3 TRPBF LCQZ 6-Lead Plastic SC70 40C to 125C 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: