LTC3536 1A Low Noise, Buck-Boost DC/DC Converter Fea T Descrip T n Regulated Output with Input Voltage Above, Below The LTC 3536 is an extended V range, fixed frequency, IN or Equal to the Output Voltage synchronous buck-boost DC/DC converter that operates n 1.8V to 5.5V Input and Output Voltage Range from input voltages above, below or equal to the regulated n 1A Continuous Output Current for output voltage. The topology incorporated in the LTC3536 V 3V, V = 3.3V provides low noise operation, making it ideal for RF and IN OUT n 1% Output Voltage Accuracy precision measurement applications. n Low Noise Buck-Boost Architecture The device can produce up to 1A of continuous output n Up to 95% Efficiency current, and it includes two N-channel and two P-channel n Programmable Frequency from 300kHz to 2MHz MOSFET switches. Switching frequencies up to 2MHz can n Synchronizable Oscillator be programmed with an external resistor and the oscilla- n Burst Mode Operation: 32A I Q tor can be synchronized to an external clock. Quiescent n Internal 1ms Soft-Start current is only 32A in Burst Mode operation, maximizing n Output Disconnect in Shutdown battery life in portable applications. Burst Mode operation n Shutdown Current: 1A is user controlled and improves efficiency at light loads. n Short-Circuit Protection n Other features include a 1A shutdown current, internal Small Thermally Enhanced 12-Pin MSOP soft-start, overtemperature protection and current limit. and 10-Pin (3mm 3mm) DFN Packages The LTC3536 is available in 12-pin thermally enhanced MSOP and 10-pin (3mm 3mm) DFN packages. a T L, LT, LTC, LTM, Burst Mode, LTSpice, Linear Technology and the Linear logo are registered trademarks and PowerPath and No R are trademarks of Linear Technology Corporation. All SENSE n Wireless Inventory Terminals other trademarks are the property of their respective owners. n Handheld Medical Instruments n Wireless Locators, Microphones n Supercapacitor Backup Power Supply Typical a T Efficiency vs Input Voltage 100 I = 200mA LOAD 4.7H 95 90 SW1 SW2 V OUT V IN 85 V V 3.3V I = 1A LOAD IN OUT 1.8V TO 5.5V 47pF 1A FOR V 3V IN 80 LTC3536 6.49k 75 1000k PWM BURST MODE/SYNC FB 70 220pF 10F OFF ON 22F SHDN 49.9k 65 RT VC PGND SGND 60 221k 55 3536 TA01a 50 1.5 2 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 3536 TA01b 3536fa 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3536 a Te Maxi Mu M r a T (Note 1) V , V , (SV , PV ) Voltage .................... 0.3V to 6V Operating Junction Temperature Range IN OUT IN IN SW1, SW2 Voltage (Notes 2, 3) ............................................ 40C to 125C DC ............................................................ 0.3V to 6V Storage Temperature Range .................. 65C to 150C Pulsed (<100ns) ........................................1.0V to 7V Lead Temperature (Soldering, 10 sec) VC, RT, FB, SHDN Voltage ............................ 0.3V to 6V MSE ..................................................................300C MODE/SYNC Voltage ................................... 0.3V to 6V p in c F T TOP VIEW TOP VIEW RT 1 12 VC RT 10 VC 1 SGND 2 11 FB SGND 9 FB 2 3 MODE/SYNC 13 10 SHDN 11 4 PGND V MODE/SYNC 3 8 SHDN SW1 9 IN PGND PGND 5 8 V IN SW1 4 7 V IN SW2 6 7 V OUT SW2 5 6 V OUT MSE PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 40C/W JMAX JA T = 125C, = 39.7C/W EXPOSED PAD (PIN 13) IS PGND MUST BE SOLDERED TO PCB JMAX JA EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO PCB FOR RATED THERMAL PERFORMANCE AND LOAD REGULATION o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3536EDD PBF LTC3536EDD TRPBF LFZD 40C to 125C 10-Lead (3mm 3mm) Plastic DFN LTC3536IDD PBF LTC3536IDD TRPBF LFZD 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3536EMSE PBF LTC3536EMSE TRPBF 3536 12-Lead Plastic MSOP 40C to 125C LTC3536IMSE PBF LTC3536IMSE TRPBF 3536 12-Lead Plastic MSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: