RH3845 – Radiation Hardened High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

The RH3845 is a high voltage, synchronous, current mode controller used for medium to high power, high efficiency supplies. It offers a wide 4V to 60V input range (7.5V minimum start-up voltage). An onboard regulator simplifies the biasing requirements by providing IC power directly from VIN.

Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation. BurstMode® is not available in the space version of the part

Additional features include adjustable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, short-circuit protection and a programmable soft-start.

Linear Technology partners with third party vendors who assemble and test packaged products with LTC RH Dice inside

Features

Processed in Compliance with LTC Certified MIL-PRF-38535 Class V Flow
High Voltage Operation: Up to 60V
Output Voltages Up to 36V
Synchronizable Up to 600kHz
Adjustable Constant Frequency: - 100kHz to 500kHz
100μA Shutdown Supply Current
Capable of Driving Large Power MOSFETs
Short-Circuit Protection and Soft-Start
Total Ionizing Dose (TID) Tolerance, per TM1019.8, MIL-STD-883:- 200kRad (Si), per condition A at 50Rads(Si)/sec- 100kRad (Si), per condition D at 10mRads(Si)/sec- ELDRS Pass 100kRad(Si)
Displacement Damage Defect (DDD) up to 1E12 Neutrons/cm2
Single Event Transient (SET), Single Event Upset (SEU) and Single Event Latchup (SEL) tests up to a Linear Energy Transfer (LET) of 117.6 MeV.cm2 /mg to case temperatures of 100°C

Typical Application

Applications

Intermediate Bus Power Supplies
Avionics and Control Systems
Distributed Power Converters

Datasheet