LM is an adjustable voltage regulator IC used for shunt regulator, current regulator, and temperature controller. The LM LMC is a voltage regulator designed primar- ily for series regulator applications By itself it will supply output currents up to mA but external. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of their respective.

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If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this:.

LM Datasheet(PDF) – National Semiconductor (TI)

This is due to the 7. No wonder after 50 years, it is known what you may expect and what not. Especially when driving MOSFETs, you might need a bleeder resistor to make the falling edges fast enough for your needs. Fill in your details below or click an icon to log in: No microscopic SMD cases available.

The LM values translate to about 0. The interior design of an LM looks like this: For your bread-and-butter PSU, they are still fine and noise is quite low. Some extra bleeders are needed to make falling edge output regulations fast enough. Can serve as positive, negative, shunt, pass, floating or switching regulator or as a temperature controller.

Both have been making s for decades, and after the sale TI took over the National Semiconductor designation of LM and used their own of uA Click here for a larger resolution picture ….

They see this chip as an old-age part that has no merits today. Notify me of new comments via email. For getting an output voltage range from 2v to 7v you can use the circuit below, which is a Basic Voltage Regulator circuit using LM voltage regulator IC.


After some ping-pong TI recommended the MIL-spec part and guaranteed that this would be free from drift. Error amp bias current. They dont make this part anymore. This also acts as a soft start feature. Extended Temperature Range available.

National Semiconductor

If you want precision current control, dont try to do this with a pot sampling a fraction of voltage across a shunt measurement resistor. Reason one is the low noise buried Zener reference, reason two is the fact that the reference voltage can be noise filtered before going into the error amp. People used to 3-terminal regulators are in for a culture shock caused by the amount of design aspects to consider.

A lot of basic application circuits can be found in the LM datasheet.

From a power supply manufacturer I read some email correspondence with TI tech support where he also claimed more drift in recent parts. Moderate error amplifer gain.

A Collection of Proper Design Practices using the LM723 IC Regulator

Minimum dropout voltage is ca. When you ask for the same basic parameters 40V, mA, … there is simply no better IC today. Not a very high PSRR.

The LM is not discontinued at all, sold by TI in the millions, available from all electronic distributors and dirt cheap. You are commenting using your Twitter account.

We have datasheeg a factor of ca. Click here for a larger resolution picture … A lot of datasneet application circuits can be found in the LM datasheet.

Gate parasitic suppression resistors of a few Ohms are also a good idea. If you need to regulate lower voltages, the LM chip itself needs a separate power input at 10V minimum.

datashedt I added a reference study that compares voltage regulator noise. Submitted by webmaster on 15 January You can tailor the frequency response to your application but you also have to do that because there is no internal compensation. First, ST went out of the LM business. The load must be able to drain at least the supply current of lm73 circuit without exhibiting a voltage higher than the desired output voltage. The LM is a classic, now available for 50 continuous years and still going strong.


Take all networks into account, and make sure that the reference divider and the output sampling network present the same impedance to the error amplifier inputs. There are only better ones with low voltage 10V and lessand they cost a lot more than a Datashret If you use current limiting, protect the base of the limiting transistor by a 1K, e.

LM IC Pinout, Specifications, Equivalent & Datasheet

Support for external pass transistorskeeping on-chip dissipation and datasheet drift low. The superbeta bipolars in the error amp have a low, but nonzero bias current that can cause voltage shifts of a few millivolts across voltage divider or RC filter resistors.

This cancels the error amps base bias currents. This wastes some power, but speed, noise and other performance criteria are a lot better with a few volts across the pass transistor. The current limiting feature is implemented as a transistor that is turned on by the voltage drop on a current sensing resistor.

Which comparable ICs are so much better now? Relying on a buried Zener low noise reference, it can compete with a lot of newer chips when it comes to stability it datasheeet have a long term stability rating in the datasheet, few new chips have that. A schematic where all this has been implemented can be see below: Provide enough voltage headroom.

It can able to provide a higher range of output voltage and current up to 10A by simply adding a series pass transistor with it, with having a wider range of operating temperature so the IC able to withstand for long.

Minimum regulated output voltage is ca.