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Product details

Parameters

Output options Adjustable Output Iout (Max) (A) 3 Vin (Max) (V) 35 Vin (Min) (V) 4.2 Vout (Max) (V) 32 Vout (Min) (V) 1.25 Noise (uVrms) 13 Iq (Typ) (mA) 0.05 Thermal resistance θJA (°C/W) 35 Load capacitance (Min) (µF) 0 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 1.8 PSRR @ 100 KHz (dB) 40 Dropout voltage (Vdo) (Typ) (mV) 2300 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

TO-220 (NDE) 3 47 mm² 10.16 x 4.58 open-in-new Find other Linear regulators (LDO)

Features

  • Adjustable Output Down to 1.2V
  • Guaranteed 3A output Current
  • Guaranteed Thermal Regulation
  • Output is Short Circuit Protected
  • Current Limit Constant with Temperature
  • P+ Product Enhancement Tested
  • 86 dB Ripple Rejection
  • Ensured 1% Output Voltage Tolerance (LM350A)
  • Ensured Max. 0.01%/V Line Regulation (LM350A)
  • Ensured Max. 0.3% Load Regulation (LM350A)
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Description

The LM150 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 3A over a 1.2V to 33V output range. They are exceptionally easy to use and require only 2 external resistors to set the output voltage. Further, both line and load regulation are comparable to discrete designs. Also, the LM150 is packaged in standard transistor packages which are easily mounted and handled.

In addition to higher performance than fixed regulators, the LM150 series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is accidentally disconnected.

Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypassing the adjustment pin will increase the regulator's ripple rejection.

Besides replacing fixed regulators or discrete designs, the LM150 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output.

By connecting a fixed resistor between the adjustment pin and output, the LM150 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current.

The part numbers in the LM150 series which have a NDS suffix are packaged in a standard Steel TO-3 package, while those with a NDE suffix are packaged in a TO-220 plastic package. The LM150 is rated for −55°C ≤ TJ ≤ +150°C, while the LM350A is rated for −40°C ≤ TJ ≤ +125°C, and the LM350 is rated for 0°C ≤ TJ ≤ +125°C.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM150/LM350A/LM350 3-Amp Adjustable Regulators datasheet (Rev. B) Mar. 20, 2013
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) May 06, 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
Application note Packaging Limits Range of Linear Regulators May 08, 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
Application note Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999

Design & development

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CAD/CAE symbols

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TO-220 (NDE) 3 View options

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