LTC3115-2 40V, 2A Synchronous Buck-Boost DC/DC Converter FEATURES DESCRIPTION n Wide V Range: 2.7V to 40V The LTC 3115-2 is a high voltage monolithic synchronous IN n Wide V Range: 2.7V to 40V buck-boost DC/DC converter optimized for applications sub- OUT n 0.8A Output Current for V 3.6V, V = 5V ject to fast (<1ms) input voltage transients. For all other IN OUT n 2A Output Current in Step-Down Operation applications, the LTC3115-1 is recommended. With its wide for V 6V 2.7V to 40V input and output voltage ranges, the LTC3115-2 IN n Programmable Frequency: 100kHz to 2MHz is well suited for use in a wide variety of automotive and n Synchronizable Up to 2MHz with an External Clock industrial power supplies. A proprietary low noise switch- n Up to 95% Efficiency ing algorithm optimizes efficiency with input voltages that n 30A No-Load Quiescent Current in Burst Mode are above, below or even equal to the output voltage and Operation ensures seamless transitions between operational modes. n Ultralow Noise Buck-Boost PWM Programmable frequency PWM mode operation provides n Internal Soft-Start low noise, high efficiency operation and the ability to syn- n 3A Supply Current in Shutdown chronize switching to an external clock. Switching frequen- n Programmable Input Undervoltage Lockout cies up to 2MHz are supported to allow use of small value n Small 4mm 5mm 0.75mm DFN Package inductors for miniaturization of the application circuit. Pin n Thermally Enhanced 20-Lead TSSOP Package selectable Burst Mode operation reduces standby current n AEC-Q100 Qualified for Automotive Applications and improves light load efficiency which, combined with a 3A shutdown current, make the LTC3115-2 ideally suited for battery-powered applications. Additional features include APPLICATIONS output disconnect in shutdown, short-circuit protection n 24V/28V Industrial Applications and internal soft-start. The LTC3115-2 is available in ther- n Automotive Power Systems mally enhanced 16-lead 4mm 5mm 0.75mm DFN and n Telecom, Servers and Networking Equipment 20-lead TSSOP packages. n FireWire Regulator All registered trademarks and trademarks are the property of their respective owners. Protected n Multiple Power Source Supplies by U.S. Patents including 6404251, 6166527 and others pending. TYPICAL APPLICATION Efficiency vs V IN 95 5V, 750kHz Wide Input Voltage Range Buck-Boost Regulator I = 0.5A LOAD 10H 90 0.1F 0.1F I = 1A LOAD BST1 SW1 SW2 BST2 5V 2.7V TO 85 PV 0.8A V > 3.6V PV IN OUT IN 40V 2A V 6V 4.7F 47F 2 IN V IN 33pF 1M LTC3115-2 3300pF 80 137k 15k BURST PWM PWM/SYNC VC OFF ON RUN FB 75 PV 249k CC RT V V = 5V CC OUT 70 GND PGND 47.5k 4.7F (OPTIONAL) 40 2 10 31152 TA01b INPUT VOLTAGE (V) 31152 TA01a Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3115-2 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-2/LTC3115I-2 ..................... 40C to 125C IN V LTC3115H-2 ....................................... 40C to 150C SW2 DC .........................................0.3V to (PV + 0.3V) LTC3115MP-2 .................................... 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 TOP VIEW PGND 1 20 PGND 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 GND 4 13 BST1 PGND PGND GND 6 15 BST2 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 16-LEAD (5mm 4mm) PLASTIC DFN FE PACKAGE 20-LEAD PLASTIC TSSOP T = 125C, = 43C/W, J = 4.3C/W JMAX JA C EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB T = 150C, J = 38C/W, = 10C/W JMAX A JC EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED TO PCB FOR RATED THERMAL PERFORMANCE Rev. B 2 For more information www.analog.com