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LTC3813 Dataheets PDF



Part Number LTC3813
Manufacturers Linear Technology
Logo Linear Technology
Description Synchronous Step-Up Controller
Datasheet LTC3813 DatasheetLTC3813 Datasheet (PDF)

LTC3813 100V Current Mode Synchronous Step-Up Controller FEATURES n High Output Voltages: Up to 100V n Large 1Ω Gate Drivers n No Current Sense Resistor Required n Dual N-Channel MOSFET Synchronous Drive n ±0.5% 0.8V Voltage Reference n Fast Transient Response n Programmable Soft-Start n Generates 10V Driver Supply from Input Supply n Synchronizable to External Clock n Power Good Output Voltage Monitor n Adjustable Off-Time/Frequency: tOFF(MIN) < 100ns n Adjustable Cycle-by-Cycle Current Limit .

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LTC3813 100V Current Mode Synchronous Step-Up Controller FEATURES n High Output Voltages: Up to 100V n Large 1Ω Gate Drivers n No Current Sense Resistor Required n Dual N-Channel MOSFET Synchronous Drive n ±0.5% 0.8V Voltage Reference n Fast Transient Response n Programmable Soft-Start n Generates 10V Driver Supply from Input Supply n Synchronizable to External Clock n Power Good Output Voltage Monitor n Adjustable Off-Time/Frequency: tOFF(MIN) < 100ns n Adjustable Cycle-by-Cycle Current Limit n Programmable Undervoltage Lockout n Output Overvoltage Protection n 28-Pin SSOP Package APPLICATIONS n 24V Fan Supplies n 48V Telecom and Base Station Power Supplies n Networking Equipment, Servers n Automotive and Industrial Control Systems DESCRIPTION The LTC3813 is a synchronous step-up switching regulator controller that can generate output voltages up to 100V. The LTC3813 uses a constant off-time peak current control architecture with accurate cycle-by-cycle current limit, without requiring a sense resistor. A precise internal reference provides ±0.5% DC accuracy. A high bandwidth (25MHz) error amplifier provides very fast line and load transient response. Large 1Ω gate drivers allow the LTC3813 to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. A shutdown pin allows the LTC3813 to be turned off, reducing the supply current to 240μA. PARAMETER Maximum VOUT MOSFET Gate Drive INTVCC UV+ INTVCC UV – LTC3813 100V 6.35V to 14V 6.2V 6V LTC3814-5 60V 4.5V to 14V 4.2V 4V L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611. TYPICAL APPLICATION High Efficiency High Voltage Step-Up Converter 50k 500k VOUT 1000pF 0.01μF 100k 100pF IOFF NDRV PGOOD BOOST LTC3813 VRNG TG SYNC SS SHDN ITH VFB SGND SW EXTVCC DRVCC INTVCC SENSE+ BG SENSE– BGRTN 0.1μF 10μH VIN + 10V TO 40V 22μF M1 Si7850DP VOUT 50V/5A D1 MBR1100 M2 Si7850DP 2x 1μF 30.9k + 270μF 2x 499Ω 3813 TA01 EFFICIENCY (%) Efficiency vs Load Current 100 VIN = 36V 95 VIN = 24V VIN = 12V 90 85 80 0 1 2 3 4 5 LOAD (A) 3813 TA01b 3813fb 1 LTC3813 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltages INTVCC, DRVCC....................................... –0.3V to 14V (DRVCC - BGRTN), (BOOST - SW).......... –0.3V to 14V BOOST ................................................. –0.3V to 114V BGRTN........................................................ –5V to 0V EXTVCC .................................................. –0.3V to 15V (NDRV - INTVCC) Voltage ........................... –0.3V to 10V SW, SENSE+ Voltage ................................... –1V to 100V IOFF Voltage .............................................. –0.3V to 100V SS Voltage ................................................... –0.3V to 5V PGOOD Voltage............................................ –0.3V to 7V VRNG, VOFF, SYNC, SHDN, UVIN Voltages........................................ –0.3V to 14V PLL/LPF, FB Voltages................................. –0.3V to 2.7V TG, BG, INTVCC, EXTVCC RMS Currents .................50mA Operating Temperature Range (Note 2) LTC3813E............................................. –40°C to 85°C LTC3813I............................................ –40°C to 125°C Junction Temperature (Notes 3, 7)........................ 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C PIN CONFIGURATION IOFF 1 NC 2 NC 3 VOFF 4 VRNG 5 PGOOD 6 SYNC 7 ITH 8 VFB 9 PLL/LPF 10 SS 11 SGND 12 SHDN 13 UVIN 14 TOP VIEW 28 BOOST 27 TG 26 SW 25 SENSE+ 24 NC 23 NC 22 NC 21 SENSE– 20 BGRTN 19 BG 18 DRVCC 17 INTVCC 16 EXTVCC 15 NDRV G PACKAGE 28-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 100°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LTC3813EG#PBF LTC3813EG#TRPBF LTC3813EG 28-Lead Plastic SSOP LTC3813IG#PBF LTC3813IG#TRPBF LTC3813IG 28-Lead Plastic SSOP Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ TEMPERATURE RANGE –40°C to 85°C –40°C to 125°C ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, INTVCC = DRVCC = VBOOST = VOFF = VRNG = SHDN = UVIN = VEXTVCC = VNDRV = 10V, VSYNC = VSENSE.


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