LTC3119 18V, 5A Synchronous Buck-Boost DC/DC Converter Fea T Descrip T n Input Voltage Range: 2.5V to 18V The LTC 3119 is a high efficiency 18V monolithic buck- n Runs Down to V = 250mV After Start-Up boost converter that can deliver up to 5A of continuous IN n Output Voltage Range: 0.8V to 18V output current. Extensive feature integration and very n 5A Output Current in Buck Mode, V > 6V low resistance internal power switches minimize the total IN n 3A Output Current for V = 3.6V, V = 5V solution footprint for even the most demanding applica- IN OUT n Programmable Switching Frequency: 400kHz to 2MHz tions. A proprietary 4-switch PWM architecture provides n Synchronizable with an External Clock Up to 2MHz seamless low noise operation from input voltages above, n Accurate Run Comparator Threshold equal to, or below the output voltage. n Burst Mode Operation, No-Load I = 35A Q External frequency programming as well as synchroniza- n Ultralow Noise Buck-Boost PWM tion using an internal PLL enable operation over a wide n Current Mode Control switching frequency range of 400kHz to 2MHz. The wide n Maximum Power Point Control 2.5V to 18V input range is well suited for operation from n Power Good Indicator unregulated power sources including battery stacks and n Internal Soft-Start backup capacitors. After start-up, operation is possible n 28-Lead 4mm 5mm QFN and TSSOP Packages with input voltages as low as 250mV. Other features include: output short-circuit protection, a T thermal overload protection, less than 3A shutdown n Wide Input Range Power Supplies current, power good indicator, Burst Mode operation, and n 1- to 4-Cell Lithium Battery Powered Products maximum power point control. n RF Power Supplies The LTC3119 is offered in thermally enhanced 28-lead n Solar Battery Chargers 4mm 5mm QFN and TSSOP packages. n System Backup Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Lead Acid to 12V Regulator and PowerPath and No R are trademarks of Analog Devices, Inc. All other trademarks are SENSE the property of their respective owners. Typical a T Wide Input Range 5V Regulator Efficiency Efciency 100 3.3H Burst Mode OPERATION 90 0.1F 0.1F 80 SW1 SW2 V OUT BST1 BST2 V 70 5V AT 5A, V > 6V IN IN PV PV IN OUT 2.5V TO 18V 5V AT 3A, V = 3.6V IN V 60 IN 150F 100k 10F LTC3119 PWM RUN 536k 50 BURST PWM PWM/SYNC FB 40 MPPC V 30 CC PGOOD V = 3V IN SV CC 102k VC V = 5V 20 IN RT PGND GND V = 9V 78.7k IN 4.7F 3119 TA01a 10 105k 100 1m 10m 100m 1 10 680pF LOAD CURRENT (A) 3119 TA01b 3119fb 1 For more information www.linear.com/LTC3119 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3119 a Te Maxi Mu M r a T (Note 1) V , PV , PV , RUN, PGOOD ................. 0.3V to 19V Operating Junction Temperature (Notes 2, 3) IN IN OUT FB, VC, RT, SYNC, MPPC, V , SV ........... 0.3V to 6V LTC3119E/LTC3119I ........................... 40C to 125C CC CC BST1 Voltage .....................(SW1 0.3V) to (SW1 + 6V) LTC3119H .......................................... 40C to 150C BST2 Voltage .....................(SW2 0.3V) to (SW2 + 6V) LTC3119MP........................................ 55C to 150C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) FE......................................................................300C p in c F T TOP VIEW TOP VIEW 1 28 PWM/SYNC N/C 2 27 N/C N/C 3 26 BST1 BST2 28 27 26 25 24 23 4 25 PGND PGND 1 22 PGND PGND 5 24 SW1 SW2 SW2 2 21 SW1 6 23 PV PV IN OUT PV 3 20 PV OUT IN 7 22 PV PV IN OUT 29 PV 4 19 PV OUT 29 IN PGND 8 21 SW1 SW2 PGND SW2 5 18 SW1 9 20 PGND PGND 6 17 PGND PGND 10 19 V PGOOD IN PGOOD 7 16 V IN 11 18 RUN SV CC SV 8 15 RUN CC 12 17 RT FB 9 10 11 12 13 14 13 16 V VC CC 14 15 MPPC SGND UFD PACKAGE FE PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN 28-LEAD PLASTIC TSSOP T = 125C, = 22C/W JMAX JA T = 150C, = 21C/W JMAX JA EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB