LTC3531/ LTC3531-3.3/LTC3531-3 200mA Buck-Boost Synchronous DC/DC Converters FEATURES DESCRIPTIO Regulated Output with Input Above, Below or Equal The LTC 3531/LTC3531-3.3/LTC3531-3 are synchronous to the Output buck-boost DC/DC converters that operate from input Single Inductor voltages above, below or equal to the output voltage. The Up to 90% Ef ciency topology incorporated in the ICs provides a continuous V Range: 1.8V to 5.5V transfer through all operating modes, making the product IN 200mA at 3.3V from 3.6V Input ideal for single cell Li-Ion and multicell alkaline or nickel OUT 125mA at 3V from 2.5V Input applications. The converters operate in Burst Mode, mini- OUT Fixed V Versions (TSOT, DFN): 3.3V, 3V mizing solution footprint and component count as well as OUT Adjustable V Version (DFN): 2V to 5V providing high conversion ef ciency over a wide range of OUT Burst Mode Operation, No External Compensation load currents. Ultra Low Quiescent Current: 16A, Shutdown The devices include two 0.5 N-channel MOSFET switches Current <1A and two P-channel switches (0.5, 0.8). Quiescent Only 3 External Components Required current is typically 16A, making the parts ideal for bat- (Fixed Voltage Versions) tery power applications. Other features include a <1A Short-Circuit Protection shutdown current, current limiting, thermal shutdown Output Disconnect in Shutdown and output disconnect. The parts are offered in a 6-pin Available in 6-Pin ThinSOT and 3mm 3mm DFN TM ThinSOT package for xed voltage versions or a 3mm Packages 3mm DFN package for xed and adjustable versions. U APPLICATIO S , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. Handheld Instruments All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6166527. MP3 Players Handheld computers PDA/GPS TYPICAL APPLICATIO Ef ciency vs V IN 100 10H 95 90 BOOST SW1 SW2 MODE V V IN OUT 85 BUCK 3.1V TO V V 3.3V IN OUT MODE 4.2V 160mA LTC3531-3.3 80 4SW Li-Ion 2.2F 10F MODE 75 SHDN GND 70 3531 TA01a 65 ON OFF 3.3V AT 100mA OUT 60 1.5 2 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 3531 TA01b 3531fb 1 EFFICIENCY (%) + U ULTC3531/ LTC3531-3.3/LTC3531-3 ABSOLUTE AXI U RATI GS (Note 1) VIN, VOUT, SW1, SW2, SHDN Voltage ...........0.3 to 6V Storage Temperature Range ................... 65C to 125C SW1, SW2 Voltage, <100ns Pulse ..................0.3 to 7V Lead Temperature (TS6, Soldering, 10 sec) .......... 300C Operating Temperature Range (Notes 2, 3) 40C to 85C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW SW1 1 8 PGND V 2 7 SW2 IN SW2 1 6 SW1 9 GND V 3 6 OUT GND, PGND 2 5 V IN SHDN 4 5 FB* V 3 4 SHDN OUT S6 PACKAGE DD PACKAGE 6-LEAD PLASTIC TSOT-23 8-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 102C/W JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD IS GND (PIN 9), MUST BE SOLDERED TO PCB *NC FOR LTC3531-3.3V, LTC3531-3.0V. ORDER PART NUMBER S6 PART MARKING ORDER PART NUMBER DD PART MARKING LTC3531ES6-3.3 LTBWM LTC3531EDD LBVC LTC3531ES6-3 LTCBK LTC3531EDD-3.3 LBWH LTC3531EDD-3 LCBV Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: