POWER LOSS (W) LTC3124 15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect FEATURES DESCRIPTION n V Range: 1.8V to 5.5V, 500mV After Start-Up The LTC 3124 is a dual-phase, synchronous step-up DC/ IN n Adjustable Output Voltage: 2.5V to 15V DC converter with true output disconnect and inrush n 1.5A Output Current for V = 5V and V = 12V current limiting capable of providing output voltages up IN OUT n Dual-Phase Control Reduces Output Voltage Ripple to 15V. Dual-phase operation significantly reduces peak n Output Disconnects from Input When Shut Down inductor and capacitor ripple currents, minimizing induc- n Synchronous Rectification: Up to 95% Efficiency tor and capacitor size. The 2.5A per phase current limit, n Inrush Current Limit along with the ability to program output voltages up to 15V n Up to 3MHz Programmable Switching Frequency make the LTC3124 well suited for a variety of demanding Synchronizable to External Clock applications. Once started, operation will continue with n Selectable Burst Mode Operation: 25A I inputs down to 500mV. Q n Output Overvoltage Protection The LTC3124 switching frequency can be programmed n Internal Soft-Start from 100kHz to 3MHz to optimize applications for highest n <1A I in Shutdown Q efficiency or smallest solution footprint. The oscillator can n 16-Lead, Thermally- Enhanced 3mm 5mm be synchronized to an external clock for noise sensitive 0.75mm DFN and TSSOP Packages applications. Selectable Burst Mode operation reduces quiescent current to 25A, ensuring high efficiency across APPLICATIONS the entire load range. An internal soft-start limits inrush n RF, Microwave Power Amplifiers current during start-up. n Piezo Actuators Other features include a <1A shutdown current and robust n Small DC Motors, Thermal Printers protection under short-circuit, thermal overload, and output n 12V Analog Rail from Battery, 5V, or Backup Capacitor overvoltage conditions. The LTC3124 is offered in both L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks 16-lead DFN and thermally-enhanced TSSOP packages. and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 5V to 12V Synchronous Boost Converter Efficiency Curve 100 10 4.7H V IN Burst Mode SWB CAP 90 5V V 100nF OPERATION OUT 12V 80 1 PGNDB V OUTB 22F 1.5A 4.7H 70 2 PWM SWA V OUTA LTC3124 60 0.1 PGNDA 50 Burst Mode V SGND IN 40 0.01 OPERATION 30 PWM/SYNC SD 1.02M BURST PWM OFF ON PWM V FB 20 0.001 CC f = 1MHz SW 10F RT V 113k EFFICIENCY C 10 POWER LOSS 84.5k 4.7F 0 0.0001 56pF 28k 0.01 0.1 1 10 100 1000 680pF LOAD CURRENT (mA) 3124 TA01b 3124 TA01a 3124f 1 For more information www.linear.com/LTC3124 EFFICIENCY (%)LTC3124 ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage ................................................... 0.3V to 6V All Other Pins ............................................... 0.3V to 6V IN V , V Voltages ............................... 0.3V to 18V Operating Junction Temperature Range (Notes 3, 4) OUTA OUTB SWA, SWB Voltages (Note 2) ..................... 0.3V to 18V LTC3124E/LTC3124I ........................... 40C to 125C SWA, SWB (Pulsed < 100ns) (Note 2) ....... 0.3V to 19V LTC3124H .......................................... 40C to 150C VC Voltage ..................................................0.3V to V Storage Temperature Range .................. 65C to 150C CC RT Voltage ..................................................0.3V to V Lead Temperature (Soldering, 10 sec) CC CAP Voltage FE Package Only ...............................................300C V < 5.7V ............................0.3V to (V + 0.3V) OUT OUT 5.7V V 11.7V...... (V 6V) to (V + 0.3V) OUT OUT OUT V > 11.7V .................................(V 6V) to 12V OUT OUT PIN CONFIGURATION TOP VIEW TOP VIEW SWB 1 16 CAP SWB 1 16 CAP PGNDB 2 15 V PGNDB 2 15 V OUTB OUTB SWA 3 14 NC SWA 3 14 NC PGNDA 4 13 V PGNDA 4 13 V OUTA OUTA 17 17 PGND PGND V 5 12 SGND V 5 12 SGND IN IN PWM/SYNC 6 11 SD PWM/SYNC 6 11 SD V 7 10 FB V 7 10 FB CC CC RT 8 9 VC RT 8 9 VC FE PACKAGE DHC PACKAGE 16-LEAD PLASTIC TSSOP 16-LEAD (5mm 3mm) PLASTIC DFN T = 150C, = 40C/W (NOTE 5), = 10C/W T = 125C, = 43C/W (NOTE 5), = 5C/W JMAX JA JC JMAX JA JC EXPOSED PAD (PIN 17) IS PGND AND MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 17) IS PGND AND MUST BE SOLDERED TO PCB FOR RATED THERMAL PERFORMANCE FOR RATED THERMAL PERFORMANCE ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3124EDHC PBF LTC3124EDHC TRPBF 3124 40C to 125C 16-Lead (5mm 3mm) Plastic DFN LTC3124IDHC PBF LTC3124IDHC TRPBF 3124 40C to 125C 16-Lead (5mm 3mm) Plastic DFN LTC3124EFE PBF LTC3124EFE TRPBF 3124FE 16-Lead Plastic TSSOP 40C to 125C LTC3124IFE PBF LTC3124IFE TRPBF 3124FE 16-Lead Plastic TSSOP 40C to 125C LTC3124HFE PBF LTC3124HFE TRPBF 3124FE 16-Lead Plastic TSSOP 40C 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 non-standard lead based finish parts. 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