RH1185AMK - Negative Regulator with Adjustable Current Limit

The RH1185AMK is a 3A low dropout regulator with adjustable current limit and remote sense capability. It can be used as a positive regulator with floating input or as a standard negative regulator with grounded input. The output voltage range is 2.5V to 25V, with ±1% accuracy on the internal reference voltage.

The RH1185AMK uses a saturation-limited NPN transistor as the pass element. This structure gives the linear dropout characteristics of a FET pass element with significantly less die area. High efficiency is maintained by using special anti-saturation circuitry that adjusts base drive to track load current.

The on-resistance is typically 0.25Ω. Accurate current limit is programmed with a single 1/8W external resistor, with a range of zero to three amperes. A second, fixed internal limit circuit prevents destructive currents if the programming current is accidentally overranged.

The RH1185AMK has all the protection features of previous LTC regulators, including power limiting and thermal shutdown.

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

Features

Input Voltage..............................................................35V
Input-Output Differential............................................30V
FB Voltage....................................................................7V
REF Voltage..................................................................7V
Output Voltage...........................................................30V
Output Reverse Voltage...............................................2V
Operating Ambient Temperature Range... –55°C to 125°C
Operating Junction Temperature Range
Control Section................................... –55°C to 150°C
Power Transistor Section.................... –55°C to 175°C
Storage Temperature Range.................... –65°C to 150°C
Thermal Resistance Junction to Case
TO-3 Control Area..............................................1°C/W
Power Transistor................................................3°C/W
Lead Temperature (Soldering, 10 sec)................... 300°C