LTC3115-1 40V, 2A Synchronous Buck-Boost DC/DC Converter FEATURES DESCRIPTION n Wide V Range: 2.7V to 40V The LTC 3115-1 is a high voltage monolithic synchronous IN n Wide V Range: 2.7V to 40V buck-boost DC/DC converter. Its wide 2.7V to 40V input OUT n 1A Output Current for V 3.6V, V = 5V and output voltage ranges make it well suited to a wide IN OUT n 2A Output Current in Step-Down Operation variety of automotive and industrial applications. A propri- for V 6V etary low noise switching algorithm optimizes efficiency IN n Programmable Frequency: 100kHz to 2MHz with input voltages that are above, below or even equal n Synchronizable Up to 2MHz with an External Clock to the output voltage and ensures seamless transitions n Up to 95% Efficiency between operational modes. n 30A No-Load Quiescent Current in Burst Mode Programmable frequency PWM mode operation pro- Operation vides low noise, high efficiency operation and the ability n Ultralow Noise Buck-Boost PWM to synchronize switching to an external clock. Switching n Internal Soft-Start frequencies up to 2MHz are supported to allow use of n 3A Supply Current in Shutdown small value inductors for miniaturization of the appli- n Programmable Input Undervoltage Lockout cation circuit. Pin selectable Burst Mode operation n Small 4mm 5mm 0.75mm DFN Package reduces standby current and improves light load effi- n Thermally Enhanced 20-Lead TSSOP Package ciency which, combined with a 3A shutdown current, n AEC-Q100 Qualified for Automotive Applications make the LTC3115-1 ideally suited for battery-powered applications. Additional features include output discon- APPLICATIONS nect in shutdown, short-circuit protection and inter- nal soft-start. The LTC3115-1 is available in thermally n 24V/28V Industrial Applications enhanced 16-lead 4mm 5mm 0.75mm DFN and n Automotive Power Systems 20-lead TSSOP packages. n Telecom, Servers and Networking Equipment All registered trademarks and trademarks are the property of their respective owners. Protected n FireWire Regulator by U.S. Patents including 6404251, 6166527 and others pending. n Multiple Power Source Supplies TYPICAL APPLICATION Efficiency vs V IN 10H 95 I = 0.5A LOAD 0.1F 0.1F 90 BST1 SW1 SW2 BST2 I = 1A 5V LOAD 2.7V TO PV 1A V > 3.6V PV IN OUT IN 40V 2A V 6V 4.7F 47F IN 85 V IN 33pF 1M LTC3115-1 3300pF 60.4k 15k BURST PWM PWM/SYNC VC 80 OFF ON RUN FB PV 249k CC 75 RT V CC GND PGND 47.5k 4.7F (OPTIONAL) V = 5V OUT 70 2 10 40 3115 TA01a INPUT VOLTAGE (V) 31151 TA01b Rev. C 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3115-1 ABSOLUTE MAXIMUM RATINGS (Note 1) V , PV , PV ........................................ 0.3V to 45V V ................................................... 0.3V to 6V IN IN OUT PWM/SYNC V Voltage, All Other Pins ................................. 0.3V to 6V SW1 DC ........................................... 0.3V to (PV + 0.3V) Operating Junction Temperature Range (Notes 2, 4) IN Pulsed (<100ns) ......................1.5V to (PV + 1.5V) LTC3115E-1/LTC3115I-1 ..................... 40C to 125C IN V LTC3115H-1 ....................................... 40C to 150C SW2 DC .........................................0.3V to (PV + 0.3V) LTC3115MP-1 ..................................... 55C to 150C OUT Pulsed (<100ns) .................... 1.5V to (PV + 1.5V) Storage Temperature Range .................. 65C to 150C OUT V ............................................. 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec) RUN IN V .....................................V 0.3V to V + 6V FE......................................................................300C BST1 SW1 SW1 V .....................................V 0.3V to V + 6V BST2 SW2 SW2 PIN CONFIGURATION TOP VIEW PGND 1 20 PGND TOP VIEW RUN 2 19 PWM/SYNC RUN 1 16 PWM/SYNC SW2 3 18 SW1 SW2 2 15 SW1 PV 4 17 PV OUT IN PV 3 14 PV OUT IN GND 5 16 BST1 21 PGND GND 4 13 BST1 GND 6 15 BST2 PGND 17 GND 5 12 BST2 VC 7 14 PV CC VC 6 11 PV CC FB 8 13 V IN FB 7 10 V IN RT 9 12 V CC RT 8 9 V CC PGND 10 11 PGND DHD PACKAGE FE PACKAGE 16-LEAD (5mm 4mm) PLASTIC DFN 20-LEAD PLASTIC TSSOP T = 150C, = 38C/W, = 10C/W JMAX JA JC T = 125C, = 43C/W, = 4.3C/W EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED JMAX JA JC EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB TO PCB FOR RATED THERMAL PERFORMANCE Rev. C 2 For more information www.analog.com