LTC3406A 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT FEATURES DESCRIPTION High Ef ciency: Up to 96% The LTC 3406A is a high ef ciency monolithic synchro- Very Low Quiescent Current: Only 20A nous buck regulator using a constant frequency, current Low Output Ripple Voltage During Burst Mode mode architecture. Supply current during operation is only Operation 20A, dropping to 1A in shutdown. The 2.5V to 5.5V 600mA Output Current input voltage range makes the LTC3406A ideally suited 2.5V to 5.5V Input Voltage Range for single Li-Ion battery-powered applications. 100% duty 1.5MHz Constant Frequency Operation cycle provides low dropout operation, extending battery No Schottky Diode Required runtime portable systems. Automatic Burst Mode opera- Low Dropout Operation: 100% Duty Cycle tion increases ef ciency at light loads, further extending 2% 0.6V Reference battery runtime. Shutdown Mode Draw 1A Supply Current Switching frequency is internally set at 1.5MHz, allowing Internal Soft-Start Limits Inrush Current the use of small surface mount inductors and capacitors. Current Mode Operation for Excellent Line and The internal synchronous switch increases ef ciency Load Transient Response and eliminates the need for an external Schottky diode. Overtemperature Protected Low output voltages are easily supported with the 0.6V TM Low Pro le (1mm) ThinSOT Package feedback reference voltage. The LTC3406A is available in a low pro le (1mm) ThinSOT package. APPLICATIONS , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a registered trademark of Linear Technology Corporation. Cellular Telephones All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258. Wireless and DSL Modems Digital Still Cameras Media Players Portable Instruments Point of Load Regulation TYPICAL APPLICATION Ef ciency vs Load Current 100 2.2H 90 V OUT V IN 1.8V V SW IN 80 22pF 600mA 4.7F 10F 70 CER LTC3406A CER 60 RUN V FB 50 619k GND 40 309k 30 3406A TA01 20 V = 2.7V IN V = 3.6V 10 IN V = 4.2V V = 1.8V OUT IN 0 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3406A TA01b 3406afa 1 EFFICIENCY (%)LTC3406A ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Supply Voltage ....................................0.3V to 6V RUN 1 5 V FB RUN, V Voltages .......................................0.3V to V FB IN GND 2 SW Voltage (DC) ........................... 0.3V to (V + 0.3V) IN SW 3 4 V IN P-Channel Switch Source Current (DC) S5 PACKAGE (Note 7) ................................................................800mA 5-LEAD PLASTIC TSOT-23 T = 125C, = 250C/W, = 90C/W N-Channel Switch Sink Current (DC) (Note 7) .....800mA JMAX JA JC Peak SW Sink and Source Current (Note 7) .............1.3A Operating Temperature Range (Note 2) LTC3406AE ..............................................40C to 85C LTC3406AI .............................................40C to 125C Junction Temperature (Notes 3, 6)........................ 125C Storage Temperature Range ...................65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3406AES5 PBF LTC3406AES5 TRPBF LTCWJ 5-Lead Plastic TSOT-23 40C to 85C LTC3406AIS5 PBF LTC3406AIS5 TRPBF LTCWJ 5-Lead Plastic TSOT-23 40C to 125C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *Temperature grades are identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: