RH1185AMK Negative Regulator with Adjustable Current Limit DESCRIPTIONABSOLUTE MAXIMUM RATINGS The RH1185AMK is a 3A low dropout regulator with ad- (Note 1) justable current limit and remote sense capability. It can Input Voltage ...35V be used as a positive regulator with floating input or as Input-Output Differential ...30V a standard negative regulator with grounded input. The FB Voltage ...7V output voltage range is 2.5V to 25V, with ±1% accuracy REF Voltage ...7V on the internal reference voltage. Output Voltage ..30V Output Reverse Voltage...2V The RH1185AMK uses a saturation-limited NPN transistor Operating Ambient Temperature Range .. –55°C to 125°C as the pass element. This structure gives the linear dropout Operating Junction Temperature Range characteristics of a FET pass element with significantly less Control Section .. –55°C to 150°C die area. High efficiency is maintained by using special Power Transistor Section ...–55°C to 175°C anti-saturation circuitry that adjusts base drive to track Storage Temperature Range ...–65°C to 150°C load current. Thermal Resistance Junction to Case The on-resistance is typically 0.25Ω. Accurate current TO-3 Control Area ...1°C/W limit is programmed with a single 1/8W external resistor, Power Transistor ...3°C/W with a range of zero to three amperes. A second, fixed Lead Temperature (Soldering, 10 sec) ..300°C internal limit circuit prevents destructive currents if the programming current is accidentally overranged. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The RH1185AMK has all the protection features of previ- ous LTC regulators, including power limiting and thermal shutdown. BURN-IN CIRCUITPACKAGE INFORMATION 15V GND FB 4.02k 3 1 2k 2 1 REF 2 CASE GND FB 3 IS VIN 2k 4 4 VOUT RH1185AMK BI VOUT REF CASE K PACKAGE 4-LEAD TO-3 METAL CAN –15V rh1185amkfa 1 Document Outline Description Electrical Characteristics
