Datasheet Analog Devices RH3845MK — Datenblatt

RH3845MW
Radiation Hardened High Voltage
Synchronous Step-Down Controller
DESCRIPTION ABSOLUTE MAXIMUM RATINGS The RH3845MW is a high voltage, synchronous, current
mode controller 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.
Additional features include an adjustable fixed operating
frequency synchronizable to an external clock for noise
sensitive applications, gate drivers capable of driving large
N-channel MOSFETs, a precision undervoltage lockout,
low shutdown current, short-circuit protection and a programmable soft-start, and overtemperature protection.
Note that Burst Mode® operation, available in the LT®3845,
is not available in the RH3845 version.
RH3845MW-1 operates in pulse skip mode where reverse
inductor current is disallowed. Regulation is achieved at
light loads by skipping cycles. Operation in pulse skip
mode yields higher light load efficiency, but higher output
voltage ripple. (Note 1, 4) VIN.65V
BOOST.80V
BOOST to SW.24V
VCC.24V …

DICE/DWF SPECIFICATION
RHK3845MKDICE
Radiation Hardened High Voltage
Synchronous Step-Down Regulator Kit
with Power NMOS FETs
Description DIE CROSS REFERENCE The RHK3845MKDICE is a radiation hardened dice kit that
includes one RH3845MK high voltage synchronous stepdown controller and two RH411MK power NMOS FETs. In
its final hybrid configuration, the RHK3845MK is a wide
input voltage range, step-down, synchronous switching
regulator. Input voltage range is 7.5V to 60V. With an
external VCC supply, minimum input can be reduced to
4.0V. The final hybrid supports output voltages up to 36V,
and a switching frequency range of 100kHz to 500kHz.
The bulk input and output capacitors, inductor, diodes and
other passive elements are needed to finish the design.
Note that Burst Mode® operation which is available in the
LT3845 is not available in the RH3845 version. LTC® Finished
Part Number Order
Part Number RHK3845MK
RHK3845MK RHK3845MK DICE
RHK3845MK DWF* Please refer to LTC standard product data sheet for
other applicable product information.
Each kit contains one RH3845MK die and two …

DICE/DWF SPECIFICATION
RH3845MK DICE
Radiation Hardened High Voltage
Synchronous Step-Down Controller
Description Absolute Maximum Ratings The RH3845MK is a high voltage, synchronous, current
mode controller 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. (Note 1) Additional features include an adjustable fixed operating
frequency synchronizable to an external clock for noise
sensitive applications, gate drivers capable of driving
large N-channel MOSFETs, a precision undervoltage
lockout, low shutdown current, short-circuit protection,
and a programmable soft-start. Note that Burst Mode®
operation, available in the LT3845, is not available in the
RH3845 version. VIN.65V
BOOST.80V
BOOST to SW.24V
VCC, MODE.24V
SENSE+, SENSE–.40V
SENSE+ TO SENSE–.±1V
SYNC, VFB, AND CSS.5V
SHDN Pin Current.1mA …