POWER LOSS (W) LTC3406-1.2 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT FEATURES DESCRIPTIO High Efficiency: Up to 90% The LTC 3406-1.2 is a high efficiency monolithic syn- Very Low Quiescent Current: Only 20A chronous buck regulator using a constant frequency, 600mA Output Current at V = 3V current mode architecture. Supply current during opera- IN 2.5V to 5.5V Input Voltage Range tion with only 20A drops <1A in shutdown. The 2.5V to 1.5MHz Constant Frequency Operation 5.5V input voltage range makes the LTC3406-1.2 ideally No Schottky Diode Required suited for single Li-Ion battery-powered applications. 100% Shutdown Mode Draws < 1A Supply Current duty cycle provides low dropout operation, extending Current Mode Operation for Excellent Line and battery life in portable systems. Automatic Burst Mode Load Transient Response operation further increases efficiency at light loads. Overtemperature Protected Switching frequency is internally set at 1.5MHz, allowing TM Low Profile (1mm) ThinSOT Package the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and U APPLICATIO S eliminates the need for an external Schottky diode. The LTC3406-1.2 is available in a low profile (1mm) ThinSOT Cellular Telephones package. Personal Information Appliances , LTC and LT are registered trademarks of Linear Technology Corporation. All other Wireless and DSL Modems trademarks are the property of their respective owners. ThinSOT is a trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066, Digital Still Cameras 6127815, 6498466, 6611131. MP3 Players Portable Instruments TYPICAL APPLICATIO Efficiency and Power Loss 100 1 High Efficiency Step-Down Converter EFFICIENCY 90 2.2H 80 0.1 V V IN V SW OUT IN 2.7V TO 5.5V C 1.2V C OUT IN 70 10F 600mA 4.7F LTC3406-1.2 CER CER 60 0.01 50 RUN V OUT 340612 TA01a POWER LOSS 40 0.001 GND 30 20 0.0001 V = 2.7V IN V = 3.6V 10 IN V = 4.2V IN 0 0.00001 0.1 1000 1 10 100 LOAD CURRENT (mA) 340612 TA01b 340612fa 1 EFFICIENCY (%) U ULTC3406-1.2 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Input Supply Voltage .................................. 0.3V to 6V RUN, V Voltages................................... 0.3V to V RUN 1 5 V OUT OUT IN GND 2 SW Voltage (DC) ......................... 0.3V to (V + 0.3V) IN SW 3 4 V IN P-Channel Switch Source Current (DC) ............. 800mA N-Channel Switch Sink Current (DC) ................. 800mA S5 PACKAGE 5-LEAD PLASTIC TSOT-23 Peak SW Sink and Source Current (V = 3V)........ 1.3A IN T = 125C, = 250C/ W, = 90C/ W JMAX JA JC Operating Temperature Range (Note 2) .. 40C to 85C Junction Temperature (Notes 3, 5) ...................... 125C S5 PART MARKING ORDER PART NUMBER Storage Temperature Range ................ 65C to 150C LTC3406ES5-1.2 LTBMQ Lead Temperature (Soldering, 10 sec)................. 300C Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: