100V Synchronous No RSENSE Step-Up DC/DC Controller with 97% Efficiency Eliminates Heat Sink

(PresseBox) ( Ismaning, )
Linear Technology Corporation announces the LTC3813, a synchronous No RSENSE step-up switching regulator controller that eliminates the boost diode and the heat sink normally required in medium to high power non-synchronous boost converters. The LTC3813 can regulate output voltages up to 100V and has powerful 1 ohm on-board dual n-channel MOSFET gate drivers that are capable of supplying high currents to slew large MOSFET gates quickly. This minimizes transition losses and allows paralleling of MOSFETs for higher current applications. In addition, the LTC3813 can regulate a 50V at 4A output with up to 97% efficiency from a 10V to 40V input source. Applications include automotive, avionics, telecom, networking equipment, servers, industrial control systems and basestations where a step-up DC/DC converter must deliver high power with low heat dissipation in a small solution size.

The LTC3813 utilizes current mode control and maintains ±0.875% reference voltage accuracy over an operating temperature range of -40°C to 85°C. Furthermore, this part uses a constant off-time peak current control architecture and has a high bandwidth (25MHz) error amplifier that provides very fast line and load transient response. The constant off-time current mode architecture provides accurate cycle-by-cycle current limit protection; a feature that is essential to protect high voltage outputs from over-current conditions. The operating frequency is selected by an external resistor from 100kHz to 1MHz which is also compensated for VIN variations and can be synchronized to an external clock for noise sensitive applications. Moreover, this part has a programmable soft-start, programmable undervoltage lockout and a power good signal that monitors the output voltage.

The LTC3813 is offered in the SSOP-28 package which provides 3 unconnected pins between adjacent high and low voltage pins for extra PC board trace clearance, compliant with circuit board design standard IPC-2221 regarding high voltage pin spacing.

Summary of Features: LTC3813
- Up to 100V Output Voltage Operation
- 97% Efficiency
- Large 1 Ohm Gate Drivers
- Eliminates Heat Sink in Medium to High Power Requirements
- No Current Sense Resistor Required
- Current Mode Control
- Adjustable Constant Off-Time for Extremely Fast Transient Response
- Synchronizable to an external Clock
- ±0.875% Reference Accuracy over -40oC to +85oC
- Programmable Soft-Start
- Power Good Signal
- Programmable Undervoltage Lockout
- Adjustable Cycle-by-Cycle Current Limit
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