DatasheetsPDF.com

LTC3713 Dataheets PDF



Part Number LTC3713
Manufacturers Linear
Logo Linear
Description Synchronous Buck DC/DC Controller
Datasheet LTC3713 DatasheetLTC3713 Datasheet (PDF)

LTC3713 Low Input Voltage, High Power, No RSENSETM Synchronous Buck DC/DC Controller FEATURES s s s DESCRIPTIO s s s s s s s s s s s s U APPLICATIO S s s s s Very Low VIN(MIN): 1.5V True Current Mode Control 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply No Sense Resistor Required Uses Standard 5V Logic-Level N-Channel MOSFETs Adjustable Current Limit Adjustable Frequency Switch tON(MIN) < 100ns 2% to 90% Duty Cycle at 200kHz 0.8V ±1% Reference Power Good Output Voltage Monit.

  LTC3713   LTC3713


Document
LTC3713 Low Input Voltage, High Power, No RSENSETM Synchronous Buck DC/DC Controller FEATURES s s s DESCRIPTIO s s s s s s s s s s s s U APPLICATIO S s s s s Very Low VIN(MIN): 1.5V True Current Mode Control 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply No Sense Resistor Required Uses Standard 5V Logic-Level N-Channel MOSFETs Adjustable Current Limit Adjustable Frequency Switch tON(MIN) < 100ns 2% to 90% Duty Cycle at 200kHz 0.8V ±1% Reference Power Good Output Voltage Monitor Programmable Soft-Start Output Overvoltage Protection Optional Short-Circuit Shutdown Timer Small 24-Lead SSOP Package The LTC®3713 is a high current, high efficiency synchronous 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 operating frequencies without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. The LTC3713 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 limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. , LTC and LT are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. Telecom Card 3.3V, 2.5V, 1.8V Step-Down Bus Termination (DDR memory, SSTL) Synchronous Buck with General Purpose Boost Low VIN Synchronous Boost TYPICAL APPLICATIO SHDN 330k 5.6k ION TG LTC3713 SW1 VFB1 SENSE+ 680pF 20k ITH BG PGND BOOST CMDSH-3 22µF ×2 M1 VIN 1.8V TO 3.3V 0.33µF L1 1.8µH VOUT 1.25V 10A EFFICIENCY (%) + M2 B340A 10k COUT 270µF ×2 SENSE – RUN/SS INTVCC 0.1µF PGOOD SGND VIN1 VIN2 4.7µF 10µF 3713 F01a MBR0520 4.7µH 12.1k VFB2 SW2 37.4k COUT: PANASONIC EEFUEOD271R L1: (A) PANASONIC ETQP6FIR8BFA (B) TOKO D104C-1.8µH M1, M2: (A) IRF7822, (B) IRF7811A Figure 1. High Efficiency Step-Down Converter from 1.8V to 3.3V Input 3713fa U Efficiency vs Load Current 100 90 80 70 60 50 40 30 20 10 0 0.01 0.04 0.10 0.40 1 7 3 LOAD CURRENT (A) 12 15 VIN = 2.5V A B 3713 F01b U 1 LTC3713 ABSOLUTE (Note 1) AXI U RATI GS U U W PACKAGE/ORDER I FOR ATIO TOP VIEW RUN/SS VON PGOOD VRNG FCB ITH SGND1 ION VFB1 1 2 3 4 5 6 7 8 9 24 BOOST 23 TG 22 SW1 21 SENSE + 20 SENSE – 19 PGND1 18 BG 17 INTVCC 16 VIN1 15 VIN2 14 PGND2 13 SW2 Input Supply Voltage (VIN2) .......................10V to – 0.3V Boosted Topside Driver Supply Voltage (BOOST) ............................................... 42V to – 0.3V VIN1, ION, SW1, SENSE+ Voltages ............. 36V to – 0.3V RUN/SS, PGOOD Voltages ......................... 7V to – 0.3V FCB, VON, VRNG Voltages .......... INTVCC + 0.3V to – 0.3V ITH, VFB1, SENSE– Voltages ..................... 2.7V to – 0.3V SW2 Voltage ............................................. 36V to – 0.4V VFB2 Voltage ................................................. VIN2 + 0.3V SHDN Voltage ......................................................... 10V TG, BG, INTVCC Peak Currents .................................. 2A TG, BG, INTVCC RMS Currents ............................ 50mA Operating Ambient Temperature Range (Note 4) ................................... – 40°C to 85°C Junction Temperature (Note 2) ............................ 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Buck Regulator IQ(VIN1) Input DC Supply Current (VIN1) Normal Shutdown Supply Current VFB1 Feedback Reference Voltage IFB1 Feedback Current ∆VFB1(LINEREG) Feedback Voltage Line Regulation ∆VFB1(LOADREG) Feedback Voltage Load Regulation gm(EA) Error Amplifier Transconductance VFCB Forced Continuous Threshold IFCB Forced Continuous Pin Current tON On-Time tON(MIN) tOFF(MIN) VSENSE(MAX) VSENSE(MIN) ∆VFB1(OV) ∆VFB1(UV) VRUN/SS(ON) VRUN/SS(LE) VRUN/SS(LT) Minimum On-Time Minimum Off-Time Maximum Current Sense Threshold VPGND – VSW Minimum Current Sense Threshold VPGND – VSW Output Overvoltage Fault Threshold Output Undervoltage Fault Threshold RUN Pin Start Threshold RUN Pin Latchoff Enable Threshold RUN Pin Latchoff Threshold The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN1 = 15V, VIN2 = 1.5V unless otherwise noted. CONDITIONS MIN TYP MAX UNITS 2 U W W W ORDER PART NUMBER LTC3713EG SHDN 10 SGND2 11 VFB2 12 G PACKAGE 24-LEAD PLASTIC SSOP.


LTC3714 LTC3713 LTC3710


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)