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LM337 Voltage Regulator: Pinout, Datasheet & More [FAQ]

Author: Mia Date: 31 Mar 2021  123

lm337 datasheet

LM337 is an adjustable negative voltage regulator IC.

 

This blog describes LM337 pinout, circuit, equivalent, features, where and how to use this ic and other important details.


Catalog

LM337 Description

LM337 Pinout

LM337 Features

LM337 Parameter

LM337 Equivalent

LM337 Circuit

Where & How to use LM337

How to safely long run LM337 in a circuit

LM337 Application

LM337 Package

Component Datasheet


LM337 Description

LM337 is an adjustable 3-terminal negative-voltage regulator capable of supplying in excess of –1.5A over an output voltage range of –1.2V to –37V. It requires only two external resistors to set the output voltage and one output capacitor for frequency compensation.

 

As a negative voltage regulator IC, LM337 is complementary to LM317 positive voltage regulator. LM337 have many built in features like overheat shutdown, overcurrent shutdown, short circuit protection etc. which makes the IC damage proof in many situations.

 

The IC will dissipate heat during operation because all the voltage difference will convert to heat and a suitable heat sink is must to use with the IC.


LM337 Pinout

LM337 voltage regulator LM337 voltage regulator pinout
LM337 voltage regulator LM337 voltage regulator pinout

 

Pin Number Pin Name Description
1 Adjust This pins adjusts the output voltage
2 Input Voltage (Vin) The input voltage which has to be regulated is given to this pin
3 Output Voltage (Vout) The regulated output voltage set by the adjust pin can be obtained from this pin

LM337 Features

  • Adjustable 3-terminal Negative voltage regulator

  • Output voltage can be set to range from -1.25V to -37V

  • Maximum Output current is -1.5A

  • Differential Input and Output Voltage is 40V(max), recommended 15V

  • Maximum output current when voltage difference is 15V is -2.2A

  • Operating junction temperature is 125°C

  • Available in To-220, SOT223, TO263 Package


LM337 Parameter

Manufacturer: Texas Instruments
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: 77dB (120Hz)
Control Features: -
Protection Features: Over Temperature Short Circuit
Operating Temperature: 0°C ~ 125°C
Mounting Type: Through Hole
Package / Case: TO-220-3
Supplier Device Package: TO-220-3
Base Part Number: LM337

LM337 Equivalent

LT137, PB137, LM317 (Positive Variable Voltage regulator), L7915CV


LM337 Circuit

The schematic below shows an adjustable negative-voltage regulator circuit based on the LM337 ic. The circuit's input voltage ranges from -3V to 40V DC, and the output voltage ranges from -1.25V to -37V.

lm337 adjustable negative voltage regulator circuit

LM337 adjustable negative voltage regulator circuit


Where & How to use LM337

Depending on the user's needs, the LM337 can be used as an adjustable or fixed regulator. The output can be adjusted using a resistor divider network connected to the IC's adjustment pin. 

 

In the resistor divider network, a variable resistor can also be used to easily adjust the output voltage to the desired level. This IC can also be used as a fixed output negative voltage regulator; simply replace the variable resistor with a fixed value resistor based on the output voltage.

 

There are a lot of online calculators that can be used to calculate the resistor value of the desired output voltage. The ic can be used in a variety of power supply and battery charger applications. The input voltage must be 2V to 3V higher than the output voltage for this IC to produce a stable output voltage.


How to safely long run LM337 in a circuit

To achieve long-term stable performance with the LM337, do not apply a load greater than 1.5A or a voltage higher than 37V. Input voltage should not exceed 40V. Use a suitable heat sink with the IC and operate it at temperatures above -40 degrees Celsius and below +125 degrees Celsius at all times. The storage temperature should be higher than -60 degrees Celsius and lower than +150 degrees Celsius.


LM337 Application

  • Used for Positive voltage regulations

  • Variable power supply

  • Current limiting circuits

  • Reverse polarity circuits

  • Commonly used in Desktop PC, DVD and other consumer products

  • Used in motor control circuits


LM337 Package

LM337 Package


Component Datasheet

LM337 Datasheet


FAQ

  • What is LM337?
The LM337 is a negative adjustable voltage regulator which can output a range of voltages from -1.5V to -38V based on the resistors R1 and R2. ... The resistor R2 then is the chief resistor which allows for the swings in different voltage outputs.
  • What is the range of the voltage level of the LM337 adjusted voltage regulator?
The LM337 series are adjustable 3-terminal negative voltage regulators capable of supplying in excess -1.5 A over a -1.2 to -37 V output voltage range.
  • What is IC 337?

The LM237 and LM337 are adjustable 3-terminal negative-voltage regulators capable of supplying in excess of –1.5 A over an output voltage range of –1.2 V to –37 V. They require only two external resistors to set the output voltage and one output capacitor for frequency compensation.

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
LM337IMP-NOPB LM337IMP-NOPB Company:Texas Instruments Remark:IC REG LIN NEG ADJ 1A SOT223-4 Package:TO-261-4, TO-261AA
DataSheet
In Stock:11000
Inquiry
Price:
1000+: $0.72495
2000+: $0.69810
5000+: $0.67125
10000+: $0.66051
25000+: $0.64440
Inquiry
LM337KVURG3 LM337KVURG3 Company:Texas Instruments Remark:IC REG LIN NEG ADJ 1.5A TO252-3 Package:TO-252-3, DPak (2 Leads + Tab), SC-63
DataSheet
In Stock:52500
Inquiry
Price:
2500+: $0.34580
5000+: $0.33280
12500+: $0.32240
25000+: $0.31200
Inquiry
LM337LM LM337LM Company:Texas Instruments Remark:Linear Voltage Regulator IC 1 Output 100mA 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $1.21000
10+: $1.08000
25+: $1.02480
100+: $0.78690
250+: $0.69540
500+: $0.65880
1000+: $0.51240
2500+: $0.48678
5000+: $0.46848
Inquiry
LM337T Company:Texas Instruments Remark:Linear Voltage Regulators NRND, alternate is LM337T/NOPB Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
405+: $1.41000
540+: $1.37000
1035+: $1.09000
2520+: $1.05000
5040+: $1.01000
10035+: $0.99100
Inquiry
LM337T-NOPB LM337T-NOPB Company:Texas Instruments Remark:IC REG LIN NEG ADJ 1.5A TO220-3 Package:TO-220-3
DataSheet
In Stock:4221
Inquiry
Price:
1+: $1.74000
10+: $1.56400
25+: $1.47520
100+: $1.18000
250+: $1.03252
500+: $1.00300
1000+: $0.79650
2500+: $0.76700
5000+: $0.73750
Inquiry

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