LTC3111 15V, 1.5A Synchronous Buck-Boost DC/DC Converter FEATURES DESCRIPTION n Regulated Output with V Above, Below The LTC 3111 is a fixed frequency, synchronous buck- IN or Equal to V boost DC/DC converter with an extended input and output OUT n 2.5V to 15V Input and Output Voltage Range range. The unique 4-switch, single inductor architecture n 1.5A Continuous Output Current: V 5V, provides low noise and seamless operation from input IN V = 5V, PWM Mode voltages above, below or equal to the output voltage. OUT n Single Inductor With an input and output range of 2.5V to 15V, the LTC3111 n Accurate RUN Threshold is well suited for a wide variety of single or multiple-cell n Up to 95% Efficiency batteries, back-up capacitor or wall adapter source applica- n 800kHz Switching Frequency, Synchronizable tions. Low R internal N-channel MOSFET switches DS(ON) Between 600kHz and 1.5MHz and selectable PWM or Burst Mode operation produce n 49A No-Load Quiescent Current in Burst Mode high efficiency over a wide range of operating conditions. Operation n An accurate RUN pin allows the user to program the Output Disconnect in Shutdown n turn-on threshold voltage of the converter. Other features Shutdown Current < 1A n include: short-circuit protection, internal soft-start and Internal Soft-Start n thermal shutdown. Small, Thermally Enhanced 14-Lead (3mm 4mm 0.75mm) DFN and 16-Lead MSOP Packages The LTC3111 is offered in both thermally enhanced 14-lead (3mm 4mm 0.75mm) DFN and 16-lead MSOP APPLICATIONS packages. n 3.3V or 5V from 1, 2 or 3 Li-Ion, Multiple-Cell L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, LTspice are registered trademarks and No R and PowerPath are trademarks of Linear Technology Corporation. SENSE Alkaline/NiMH Batteries All other trademarks are the property of their respective owners. Protected by U.S. Patents, n including 6404251, 6166527, 5481178, 6304066, 6580258. RF Transmitters n Military, Industrial Power Systems TYPICAL APPLICATION 5V, 800kHz Wide Input Voltage Buck-Boost Regulator Efficiency at 5V OUT 4.7H 100 PWM 90 0.1F 0.1F SW1 SW2 BURST 80 V BST1 BST2 OUT 5V V IN V V IN OUT 1.5A 70 2.5V TO 15V 680pF 10F 22F LTC3111 (V > 5V) 26.1k IN 20k COMP 1M 60 33pF BURST PWM PWM/SYNC 27pF 50 OFF ON RUN FB V = 2.7V IN SNSGND V 191k CC 40 V = 5V 1F IN SGND PGND V = 12V IN 3111 TA01a 30 0.0001 0.001 0.01 0.1 1 10 LOAD CURRENT (A) 3111 TA01b 3111fa 1 For more information www.linear.com/LTC3111 EFFICIENCY (%)LTC3111 ABSOLUTE MAXIMUM RATINGS (Notes 1, 3) V Voltage ................................................. 0.3V to 16V Operating Junction Temperature Range (Notes 2, 5) IN V Voltage .............................................. 0.3V to 16V LTC3111E, LTC3111I ........................... 40C to 125C OUT SW1 Voltage (Note 4) ................... 0.3V to (V + 0.3V) LTC3111H ........................................... 40C to 150C IN SW2 Voltage (Note 4) .................0.3V to (V + 0.3V) LTC3111MP ........................................ 55C to 150C OUT BST1 Voltage ...................(V 0.3V) to (V + 6V) Maximum Junction Temperature (Note 3)............. 150C SW1 SW1 BST2 Voltage ...................(V 0.3V) to (V + 6V) Storage Temperature Range .................. 65C to 150C SW2 SW2 RUN Voltage............................................... 0.3V to 16V Lead Temperature (Soldering, 10sec) PWM/SYNC, V Voltage ............................. 0.3V to 6V MSOP ...............................................................300C CC FB, COMP, Voltage ....................................... 0.3V to 6V PIN CONFIGURATION TOP VIEW TOP VIEW COMP 1 14 SGND COMP 1 16 SGND FB 2 13 PWM/SYNC 2 FB 15 PWM/SYNC SNSGND 3 12 V SNSGND 3 14 V CC CC 15 4 17 RUN 13 NC RUN 4 11 NC PGND V 5 PGND 12 V IN OUT V 5 10 V 6 SW1 11 SW2 IN OUT BST1 7 10 BST2 SW1 6 9 SW2 8 PGND 9 PGND BST1 7 8 BST2 MSE PACKAGE 16-LEAD PLASTIC MSOP DE PACKAGE T = 150C, = 40C/W, = 10C/W JMAX JA JC 14-LEAD (4mm 3mm) PLASTIC DFN EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB T = 150C, = 43C/W, = 5C/W JMAX JA JC EXPOSED PAD (PIN 15) IS PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3111EDE PBF LTC3111EDE TRPBF 3111 14-Lead (4mm 3mm) Plastic DFN 40C to 125C LTC3111IDE PBF LTC3111IDE TRPBF 3111 14-Lead (4mm 3mm) Plastic DFN 40C to 125C LTC3111HDE PBF LTC3111HDE TRPBF 3111 14-Lead (4mm 3mm) Plastic DFN 40C to 150C LTC3111MPDE PBF LTC3111MPDE TRPBF 3111 14-Lead (4mm 3mm) Plastic DFN 55C to 150C LTC3111EMSE PBF LTC3111EMSE TRPBF 3111 16-Lead Plastic MSOP 40C to 125C LTC3111IMSE PBF LTC3111IMSE TRPBF 3111 16-Lead Plastic MSOP 40C to 125C LTC3111HMSE PBF LTC3111HMSE TRPBF 3111 16-Lead Plastic MSOP 40C to 150C LTC3111MPMSE PBF LTC3111MPMSE TRPBF 3111 16-Lead Plastic MSOP 55C to 150C 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 nonstandard lead based finish parts. For more information on lead free part marking, go to: