LTC3813
100V Current Mode Synchronous Step-Up Controller
FEATURES
n High Output Voltages: Up to 100V n Large 1Ω Gate Dr...
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 Under
voltage Lockout n Output Over
voltage 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...