RH1185AMK - Negative Regulator with Adjustable Current Limit

Features

ABSOLUTE MAXIMUM RATINGS
(Note 1)
  • 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

Typical Application

RH1185AMK Typical Application

Description

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.

Third Party Vendor Availability

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

Part Number Description SMD
MSK5940-5.0RH 3A Negative Fixed Voltage LDO Regulator -
MSK5940-5.2RH 3A Negative Fixed Voltage LDO Regulator -
MSK5940-10RH 3A Negative Fixed Voltage LDO Regulator -
MSK5940-12RH 3A Negative Fixed Voltage LDO Regulator -
MSK5940-15RH 3A Negative Fixed Voltage LDO Regulator -
VRG8651 1A/3A Dual Positive/Negative Adj. LDO Reg, Thru Hole 5962-09201
VRG8652 1A/3A Dual Positive/Negative Adj. LDO Reg, Surf Mount 5962-09201
VRG8653 3A Dual Positive/Negative Adj. Regulator, Thru Hole 5962-10213
VRG8654 3A Dual Positive/Negative Adj. Regulator, Surf Mount 5962-10213
VRG8663 3A Negative Adjustable Regulator 5962-09207

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

RH1185AMK Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support