LM137H/NOPB

Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Negative
Output Type:	Adjustable
Number of Regulators:	1
Voltage - Input (Max):	-40V
Voltage - Output (Min/Fixed):	-1.2V
Voltage - Output (Max):	-37V
Voltage Dropout (Max):	--
Current - Output:	1.5A
PSRR:	66dB (120Hz)
Control Features:	--
Protection Features:	Over Current, Over Temperature, Short Circuit
Operating Temperature:	-55°C ~ 150°C
Mounting Type:	Through Hole
Package / Case:	TO-205AD, TO-39-3 Metal Can
Supplier Device Package:	TO-39-3
Base Part Number:	LM137

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Introduction

LM137H/NOPB is the first high voltage, linear regulator with an adjustable output voltage range of 4.75 V to 37 V. LM137H/NOPB includes current limitation and thermal shutdown, making it a good choice for rugged applications. It is available in a chip format with a maximum operating temperature of 125 °C (extended temperature range option) and a production temperature range of -20 °C to 105 °C. This device also includes reverse polarity protection.

Overview

The LM137H/NOPB linear regulator is intended for systems where the input-to-output voltage requirement is greater than 3.9 V. It can provide output currents up to 50 mA, and is off-the-shelf convenient with minimal configuration changes required. It features an adjustable output voltage range, current limit protection, and thermal shutdown protection, making it a suitable solution for a wide variety of applications.

Application Field

The LM137H/NOPB linear regulator is used in a wide range of applications, including automotive, industrial and consumer electronics, process control and instrumentation, LED lighting, condenser-based air conditioning and refrigeration systems, telecommunications, and more. A few possible applications include power supplies, DC-DC converters, data acquisition systems, electronic door locks, and embedded controllers.

Working Principle

The LM137H/NOPB linear regulator is a 3-terminal monolithic integrated circuit that utilizes a unique internal architecture to provide a linear adjustable regulator capable of producing output voltages from 4.75 V to 37 V. Its output voltage is adjusted by connecting either an external voltage divider or a single resistor between its output and its adjustment terminal. The LM137H/NOPB is designed to provide large adjustment ranges over certain temperature and load variations. It can supply output currents up to 50 mA and is off-the-shelf convenient with minimal configuration changes required. The device can be enabled to provide a constant output voltage by utilizing its current limit protection feature. The LM137H/NOPB also provides thermal shutdown protection. It uses an internal thermal shutdown circuit to limit the temperature of the die when the operating temperature exceeds the designed value.

Conclusion

The LM137H/NOPB linear regulator offers an adjustable output voltage range of 4.75 V to 37 V and is ideal for rugged applications. It includes current limiting protection and thermal shutdown protection, making it a suitable solution for a wide range of applications. It is suitable for applications requiring an adjustable regulated dc voltage, such as power supplies, DC-DC converters, embedded controllers, data acquisition systems, and more.

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