January 29, 2020 By:

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 you have a heavily overcompensated i. You are commenting using your Twitter account.

Especially when driving MOSFETs, you might need a bleeder resistor to make the falling edges fast enough for your needs. The load must be able to drain at least the supply current of dataxheet circuit without exhibiting a voltage higher than the desired output voltage. They dont make this part anymore. Submitted by webmaster on 15 January Minimum regulated output voltage is ca.

LM IC Pinout, Specifications, Equivalent & Datasheet

A lot of basic application circuits can be found in the LM datasheet. We have only a factor of ca. Although the LM can dissipate a few mW and deliver up to mA, better use an external pass transistor to do the hard work and keep the regulator datashedt cool.


This cancels the error amps base bias currents. This also acts as a soft start feature. 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.

TL — Programmable Reference Voltage.

National Semiconductor

One of the best low noise regulators even today when hooked up properly. There is even an obsolete 80V version, the LCB. If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this:. The datasheet is not very instructive on this, but the floating regulator variants will fail to regulate when the load resistance becomes to high. Compensation by the user. This wastes some power, but speed, noise and other performance criteria are a lot better with a few volts across the pass transistor.

For your bread-and-butter PSU, they are still fine and noise is quite low. When you ask for the same basic parameters 40V, mA, … there is simply no better IC today.

Before you specify a compensation cap, run a few tests using SPICE to see if gain and phase margins are in order. Minimum dropout voltage is ca. They see this chip as an old-age part that has no merits today. Its a self-heated reference.


A schematic where all this has been implemented can be see below: The LM is not discontinued at all, sold by TI in the millions, available from all electronic distributors and dirt cheap.

Notify me of new comments via email. Current limiting sensitive to overload. Pin configuration Pin No. With less accurracy, you may go below that, but not by much. A schematic with all suggestions implemented can be seen at the bottom of this page.

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.

LM Datasheet(PDF) – National Semiconductor (TI)

Its comparing apples and oranges. Take all networks into account, and make sure that the reference divider and the output sampling network present the same datssheet to the error amplifier inputs. Intolerant to missing or misdesigned compensation. The LM values translate to about 0. Yes, it will oscillate if you forget or undercompensate.