LM345 Datasheet | National Semiconductor

Description The LM145 is a three-terminal negative regulator with a fixed output voltage of b5V and up to 3A load current capability This device needs only one external ponent a pensation capacitor at the output making it easy to apply Worst case guarantees on output voltage deviation due to any bination of line load or temperature variation assure satisfactory system operation Exceptional effort has been made to make the LM145 immune to overload conditions The regulator has current limiting which is independent of temperature bined with thermal overload protection Internal current limiting protects against momentary faults while thermal shutdown prevents junction temperatures from exceeding safe limits during prolonged overloads Although primarily intended for fixed output voltage applications the LM145 may be programmed for higher output voltages with a simple resistive divider The low quiescent drain current of the device allows this technique to be used with good regulation The LM145 es in a hermetic TO-3 package rated at 25W A reduced temperature range part LM345 is also available Features Output voltage accurate to better than g 2% Current limit constant with temperature Internal thermal shutdown protection Operates with input-output voltage differential of 2 8V at full rated load over full temperature range Regulation guaranteed with 25W power dissipation 3A output current guaranteed Only one external ponent needed P a Product Enhancement tested Schematic Diagram TL H 7785 - 1 C1995 National Semiconductor Corporation TL H 7785 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications (Note 3) Input Voltage 20V Input-Output Differential 20V Power Dissipation Internally Limited Operating Junction Temperature Range b 55 C to a 150 C LM145 LM345 0 C to a 125 C b 65 C to a 150 C Storage...