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 our previous regulators, including power limiting and thermal shutdown.

Third Party Vendor Availability Analog Devices partners with third party vendors who assemble and test packaged products with RH Dice inside.

Part Number

Description

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3A Negative Adjustable Regulator

* Input Voltage: 35V

* Input-Output Differential : 0V

* FB Voltage: 7V

* REF Voltage: 7V

* Output Voltage: 30V

* Output Reverse Voltage: 2V

* Operating Ambient Temperature Range: –55°C to 125°C