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LTC3713EG Datasheet(PDF) 1 Page - Linear Technology |
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LTC3713EG Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC3713 3713fa FEATURES APPLICATIO S DESCRIPTIO TYPICAL APPLICATIO Low Input Voltage, High Power, No RSENSE TM Synchronous Buck DC/DC Controller s Very Low VIN(MIN): 1.5V s True Current Mode Control s 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply s No Sense Resistor Required s Uses Standard 5V Logic-Level N-Channel MOSFETs s Adjustable Current Limit s Adjustable Frequency s Switch tON(MIN) < 100ns s 2% to 90% Duty Cycle at 200kHz s 0.8V ±1% Reference s Power Good Output Voltage Monitor s Programmable Soft-Start s Output Overvoltage Protection s Optional Short-Circuit Shutdown Timer s Small 24-Lead SSOP Package s Telecom Card 3.3V, 2.5V, 1.8V Step-Down s Bus Termination (DDR memory, SSTL) s Synchronous Buck with General Purpose Boost s Low VIN Synchronous Boost The LTC ®3713 is a high current, high efficiency synchro- nous buck switching regulator controller optimized for use with very low input supply voltages. It operates from inputs as low as 1.5V and provides a regulated output voltage from 0.8V up to (0.9)VIN. The controller uses a valley current control architecture to enable high operat- ing frequencies without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VINandVOUT.TheLTC3713 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or low threshold devices. Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference, and can assist secondary winding regulation by disabling discontinuous operation when the main output is lightly loaded. Fault protection is provided by internal foldback current limit- ing, an output overvoltage comparator and an optional short-circuit shutdown timer. Figure 1. High Efficiency Step-Down Converter from 1.8V to 3.3V Input Efficiency vs Load Current , LTC and LT are registered trademarks of Linear Technology Corporation. RUN/SS BOOST TG SW1 SENSE+ SENSE– 0.33 µF LTC3713 5.6k 10k 20k 680pF 0.1 µF M1 CMDSH-3 PGND BG INTVCC VIN1 VIN2 ITH PGOOD ION VFB1 SHDN SGND VFB2 SW2 10 µF M2 B340A COUT: PANASONIC EEFUEOD271R L1: (A) PANASONIC ETQP6FIR8BFA (B) TOKO D104C-1.8 µH M1, M2: (A) IRF7822, (B) IRF7811A L1 1.8 µH COUT 270 µF ×2 3713 F01a 22 µF ×2 VIN 1.8V TO 3.3V VOUT 1.25V 10A 4.7 µF 4.7 µH MBR0520 12.1k 37.4k 330k + No RSENSE is a trademark of Linear Technology Corporation. LOAD CURRENT (A) 0.01 0 10 30 40 50 100 70 0.10 1 3 3713 F01b 20 80 A B 90 60 0.04 0.40 7 12 15 VIN = 2.5V |
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