POWER LOSS (W) LTC3560 2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT FEATURES DESCRIPTION n High Ef ciency: Up to 95% The LTC 3560 is a high ef ciency monolithic synchronous n Low Output Ripple (<20mV ): Burst Mode buck regulator using a constant frequency, current mode P-P Operation: I = 16A architecture. Supply current during operation is only 16A, Q n 2.5V to 5.5V Input Voltage Range dropping to <1A in shutdown. The 2.5V to 5.5V input n 2.25MHz Constant Frequency Operation voltage range makes the LTC3560 ideally suited for single n Synchronizable to External Clock Li-Ion/Li-Polymer battery-powered applications. 100% n No Schottky Diode Required duty cycle provides low dropout operation, extending n Stable with Ceramic Capacitors battery life in portable systems. n Low Dropout Operation: 100% Duty Cycle Switching frequency is internally set at 2.25MHz, allowing n 0.6V Reference Allows Low Output Voltages the use of small surface mount inductors and capacitors. n Shutdown Mode Draws <1A Supply Current For noise sensitive applications the LTC3560 can be ex- n 2% Output Voltage Accuracy ternally synchronized from 1MHz to 3MHz. Burst Mode n Current Mode Operation for Excellent Line and operation is inhibited during synchronization or when the Load Transient Response SYNC/MODE pin is pulled high, preventing low frequency n Overtemperature Protected ripple from interfering with audio circuitry. n Low Pro le (1mm) ThinSOT Package The internal synchronous switch increases ef ciency and eliminates the need for an external Schottky diode. APPLICATIONS Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3560 is available in a n Cellular Telephones low pro le (1mm) ThinSOT package. n Wireless and DSL Modems n Digital Still Cameras L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property n Media Players of their respective owners. Protected by U.S. Patents including 6580258, 5481178, 5994885, 6304066, 6498466, 6611131. n Portable Instruments TYPICAL APPLICATION 100 1 90 80 0.1 70 60 2.2H V IN V OUT 50 0.01 2.7V V SW IN 2.5V 10pF TO 5.5V C IN C 40 LTC3560 OUT 10F 10F CER RUN 30 CER 0.001 SYNC/MODE V 20 FB V = 3.6V IN 806k V = 4.2V IN GND 10 V = 5.5V 255k IN 3405A F01a 0 0.0001 0.1 1 10 100 1000 LOAD CURRENT (mA) 3560 F01b Figure 1a. High Ef ciency Step-Down Converter Figure 1b. Ef ciency vs Load Current 3560fb 1 EFFICIENCY (%)LTC3560 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) Input Supply Voltage ................................... 0.3V to 6V TOP VIEW SYNC/MODE, RUN, V Voltages ............... 0.3V to V FB IN RUN 1 6 SYNC/MODE SW Voltage (DC) .......................... 0.3V to (V + 0.3V) GND 2 5 V IN FB SW 3 4 V P-Channel Switch Source Current (DC) (Note 6)..... 1.2A IN N-Channel Switch Sink Current (DC) (Note 6) ........ 1.2A S6 PACKAGE 6-LEAD PLASTIC TSOT-23 Peak SW Sink and Source Current (Note 6) ........... 2.1A T = 125C, = 250C/W JMAX JA Operating Temperature Range (Note 2) LTC3560E .............................................40C to 85C LTC3560I............................................40C to 125C Junction Temperature (Notes 3, 7) ...................... 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 LTC3560ES6 PBF LTC3560ES6 TRPBF LTCFY 6-Lead Plastic TSOT-23 40C to 85C LTC3560IS6 PBF LTC3560IS6 TRPBF LTCFY 6-Lead Plastic TSOT-23 40C to 125C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is 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: