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LM317BTG

1.5A Adjustable LDO Regulator, 1.2-37V Output, TO-220

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Manufacturer Part：

LM317BTG

Package：

TO-220-3 (15.0 x 10.4 x 4.6 mm)

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Description

Product Overview

The LM317BTG from onsemi is a 1.5 A adjustable positive linear voltage regulator with 1.2 V to 37 V output range and 40 V maximum input in a TO-220 through-hole package.

Key Specifications

Type Adjustable Positive Linear Voltage Regulator
Output Voltage Range 1.2 V to 37 V
Output Current 1.5 A
Input Voltage (Max) 40 V
Dropout Voltage 2.5 V (typical) @ Io=1.5A
Line Regulation 0.01%/V (typical)
Load Regulation 0.1% (typical)
Reference Voltage 1.25 V
Package TO-220-3
Operating Temperature 0C to +125C

Features

  • Output adjustable from 1.2 V to 37 V
  • 1.5 A output current
  • 0.1% typical load regulation
  • Internal thermal overload protection
  • Internal short-circuit current limiting
  • Output transistor safe-area compensation

Applications

  • Adjustable bench power supplies
  • Battery chargers with constant voltage/current
  • Local on-card voltage regulation
  • Current limiter and constant current source

The LM317BTG from onsemi is the industry-standard adjustable positive linear voltage regulator capable of supplying 1.5 A over an output voltage range of 1.2 V to 37 V. The output voltage is set using only two external resistors. The device features excellent 0.01%/V line regulation and 0.1% load regulation. Internal protection circuits include thermal shutdown, current limiting, and safe-area compensation for the output transistor. The TO-220 package allows mounting on a heatsink for high-power dissipation applications. The LM317 is one of the most widely used linear regulators in the industry.

The LM317BTG maintains a constant 1.25 V reference between the output (VOUT) and adjustment (ADJ) pins. This reference voltage drives a constant current through the external resistor R1 (typically 240 Ohm) from VOUT to ADJ. The ADJ pin draws a very small quiescent current (50 uA typical), which also flows through the second resistor R2 from ADJ to ground. The output voltage is calculated as VOUT = 1.25V x (1 + R2/R1) + IADJ x R2. Since IADJ is typically 50 uA, its contribution is negligible for most designs. The internal error amplifier compares the 1.25 V reference with the voltage across R1 and adjusts the pass transistor to maintain regulation. The thermal shutdown circuit monitors junction temperature and shuts down the pass transistor above approximately 170C. The current limiting circuit restricts output current to approximately 2.2 A under short-circuit conditions.

Pin Name Type Function
1 ADJ Input Adjustment pin (sets output voltage)
2 VOUT Output Regulated output (1.2-37V)
3 VIN Input Unregulated input (up to 40V)
  • Adjustable bench power supply 1.2-30V at 1.5A
  • Constant current battery charger with current-set resistor
  • On-card 5V to 3.3V regulation with heatsink
  • Variable speed DC motor controller power stage
Manufacturer Part Number Package Notes
TI LM317T TO-220 Industry standard equivalent
ST LM317T TO-220 Industry standard equivalent
onsemi LM317BD2TG D2PAK SMD version, same function
TI LM317HV TO-220 High-voltage version (57V max input)
TI LM338T TO-220 5A version, same topology
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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