LM337BT

Current - Output:	1.5A
Base Part Number:	LM337B
Supplier Device Package:	TO-220AB
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	77dB (120Hz)
Current - Supply (Max):	10mA
Current - Quiescent (Iq):	6mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	-37V
Voltage - Output (Min/Fixed):	-1.2V
Voltage - Input (Max):	-40V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Negative
Part Status:	Obsolete
Packaging:	Tube

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Overview

LM337BT is a three-terminal adjustable voltage regulator from STMicroelectronics. A truly versatile device, the LM337BT provides positive or negative regulated voltages from 1.2V up to 37V, meaning it can be used for applications that require both positive and negative stable voltages over a wide range of currents, including multiple-power supplies.

Application Field

The LM337BT is designed for use in a variety of different applications, primarily those requiring a regulated output over a wide range of current demands and temperature ranges. The device is ideally suited to automotive, telecommunications and industrial applications, including:

• Regulation of low voltage and low current power supplies to ensure stability
• Regulation of high voltage, low current power supplies, such as in battery-operated systems
• Providing a regulated voltage source for power supplies
• Providing regulated voltage and current supplies for electronic equipment

Working Principle

The LM337BT works on the principle of a negative feedback loop. It has a control input (the "I" pin) where the required output voltage is specified by the connected external component. The potential difference between this input and the output voltage is then sensed and compared by the internal amplifier.When the output voltage is higher than the voltage at the input, the amplifier will increase the current flow through the pass element of the device, thereby increasing the output voltage. Conversely, when the output voltage is lower than the voltage at the input, the amplifier will decrease the current flow through the pass element, thereby decreasing the output voltage.This feedback loop allows the LM337BT to maintain a regulated output voltage that is equal to the voltage at the input, no matter how much the load or input voltage may vary.

Summary

The LM337BT is a versatile device for providing regulated voltages over a wide range of current demands and temperature ranges. It works on the principle of a negative feedback loop, using an internal amplifier to sense the potential difference between the input voltage and the output voltage and adjust the current flow through the pass element accordingly. This allows it to maintain a stable regulated output voltage, no matter how much the load or input voltage may vary. It is ideal for automotive, telecommunications, and industrial applications that require reliable and stable power supplies.

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