LM337KTPR

Voltage Dropout (Max):	--
Base Part Number:	LM337
Supplier Device Package:	2-PowerFLEX™
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	77dB (120Hz)
Current - Output:	1.5A
Series:	--
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Part Status:	Obsolete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:	Tape & Reel (TR)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Introduction

The LM337KTPR is a precision three-terminal adjustable negative-voltage regulator designed to provide adjustable output from -1V to -40V. It works well for applications requiring regulated negative voltages, such as battery-powered systems, with a wide range of input voltages from 0V to 40V available. It is designed using closed-loop technology to ensure precise voltage regulation and has a very high accuracy level — typically ±2mV — and ripple rejection — typically of 50dB — at the junction terminal to ensure precise output voltage control. The adjustable output voltage is set by two external resistors and can be mechanically or digitally adjusted. With advanced thermal compensation, the LM337KTPR also provides better than regulation when operating temperature changes, making it an excellent choice for applications with strict regulation requirements.

Features

The LM337KTPR offers a range of features that make it one of the most reliable and versatile adjustable-voltage negative-voltage regulators available. Some of these features include:

• High precision: ±2mV under load.
• Wide input voltage range: 0V to 40V.
• Flexible adjustable output voltage: -1V to -40V.
• High output current capability: 1.5A.
• Low supply current: typ. 8mA, max. 20mA.
• Low quiescent current – typ. 20µA.
• High ripple rejection: typ. 50dB.
• Short-circuit protection.
• Thermal protection.
• ESD (electrostatic discharge) protection.

Applications

The LM337KTPR is mainly used in applications requiring adjustable negative voltages. Some of its primary applications include:

• Linear feedback systems.
• Battery charging and monitoring.
• Medical and automotive applications.
• Power supply monitoring.
• Power sources for logic circuits.
• Signal conditioning.
• Instrumentation and industrial control.
• Low and negative voltage power supplies.
• Portable and wearable electronics.
• Communication and networking.

Working Principle

The LM337KTPR works on the well-known principle of negative feedback, which is widely used in linear analog circuitry. It consists of two circuits - an error amplifier and a voltage reference. The reference is used to produce a fixed output voltage (i.e. negative relative to the input). The error amplifier compares the output voltage to the reference voltage and adjusts the output accordingly. The voltage reference produces a precise, fixed negative voltage. It is highly stable, and the output voltage is not affected by changes in load, temperature or input voltage. This is achieved by using a specialised Feedback Network to vary the terminal current. The error amplifier compares the reference voltage to the output voltage and drives the voltage regulator accordingly.The adjustable output voltage is set by two external resistors (R1 and R2), as follows:

V_out = V_ref + (R1/R2)*V_ref

where V_ref is the reference voltage generated by the internal voltage reference.

Conclusion

The LM337KTPR is an adjustable negative voltage regulator, designed to provide adjustable output from -1V to -40V. It is highly suitable for nominal 5V to 12V applications, with a wide range of input voltages from 0V to 40V available. It provides very precise voltage regulation with its high accuracy and ripple rejection. Additionally, it offers high output current capability, low supply and quiescent current and features such as ESD protection, thermal protection and short-circuit protection. The LM337KTPR is primarily used in applications requiring adjustable negative voltages, such as linear feedback systems, battery charging and monitoring, medical and automotive applications, among many others.

The specific data is subject to PDF, and the above content is for reference

Part Number	Manufacturer	Price	Quantity	Description