LTC3813EG#PBF LINEAR

LTC3813 100V Current Mode Synchronous Step-Up Controller FEATURES DESCRIPTION n 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. n n n n n n n n n n n n n n High Output Voltages: Up to 100V Large 1Ω Gate Drivers No Current Sense Resistor Required Dual N-Channel MOSFET Synchronous Drive ±0.5% 0.8V Voltage Reference Fast Transient Response Programmable Soft-Start Generates 10V Driver Supply from Input Supply Synchronizable to External Clock Power Good Output Voltage Monitor Adjustable Off-Time/Frequency: tOFF(MIN) < 100ns Adjustable Cycle-by-Cycle Current Limit Programmable Undervoltage Lockout Output Overvoltage Protection 28-Pin SSOP Package 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. APPLICATIONS PARAMETER n MOSFET Gate Drive n n n LTC3813 LTC3814-5 100V 60V 6.35V to 14V 4.5V to 14V 6.2V 4.2V 6V 4V Maximum VOUT 24V Fan Supplies 48V Telecom and Base Station Power Supplies Networking Equipment, Servers Automotive and Industrial Control Systems INTVCC UV + INTVCC UV – 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 Efficiency vs Load Current High Efficiency High Voltage Step-Up Converter 50k 500k PGOOD VRNG BOOST LTC3813 SYNC 1000pF SHDN 0.1μF VOUT 50V/5A SW DRVCC D1 MBR1100 INTVCC ITH 100k SGND SENSE– BGRTN 1μF VIN = 12V 90 85 30.9k + M2 Si7850DP 2x BG VIN = 24V 95 22μF M1 Si7850DP SENSE+ VFB 100pF TG EXTVCC SS 0.01μF + 10μH VIN = 36V VIN 10V TO 40V NDRV IOFF EFFICIENCY (%) VOUT 100 499Ω 270μF 2x 80 0 1 2 3 LOAD (A) 4 5 3813 TA01b 3813 TA01 3813fb 1

LINEAR

Linear Technology Corp.

U.S.A

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