Microchip Technology Inc
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LR8

High Voltage Adjustable 3-Terminal Linear Regulator, 450V

Status: In Production

Features:

  • 13.2 - 450V input voltage range
  • Adjustable 1.20 - 440V output regulation
  • 5% output voltage tolerance
  • Output current limiting
  • 10µA typical ADJ current
  • Internal junction temperature limiting
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Overview
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Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of 13.2 - 450V. The output voltage can be adjusted from 1.20 - 440V provided that the input voltage is at least 12V greater than the output voltage. The output voltage can be adjusted by means of two external resistors R1 and R2 as shown in the typical application circuits. The LR8 regulates the voltage difference between VOUT and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified by the external resistor ratio R1 and R2. An internal constant bias current of typically 10µA is connected to the ADJ pin. This increases VOUT by a constant voltage of 10µA times R2. The LR8 has current limiting and temperature limiting. The output current limit is typically 20mA and the minimum temperature limit is 125°C. An output short circuit current will therefore be limited to 20mA. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applications, the LR8 turns off when an external voltage greater than the output voltage of the LR8 is applied to VOUT of the LR8. To maintain stability, a bypass capacitor of 1.0µF or larger and a minimum DC output current of 500µA are required. The device is available in TO-243AA (SOT-89), TO-252 (D-PAK), and TO-92 packages.

Additional Features
  • 13.2 - 450V input voltage range
  • Adjustable 1.20 - 440V output regulation
  • 5% output voltage tolerance
  • Output current limiting
  • 10µA typical ADJ current
  • Internal junction temperature limiting
Parametrics
Name
Value
+Vin min (V)
13.2
+Vin max (V)
450
Vout min (V)
1.2
Vout max (V)
440
Output Current (mA)
10
Dimming
N/A
Parallelable
N/A
Package
SOT-89, TO-92, TO-252
Features
Adj. Output, Overcurrent Limiting, OTP

Documents

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Development Environment

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Software Libraries
Analog Simulation - LR8

LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of 13.2 - 450V. The output voltage can be adjusted from 1.20 - 440V provided that...

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RoHS Information

Part Number
Device Weight
Shipping Weight
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
LR8N3-G
0.203400
0.219000
3
TO-92
-
Matte Tin
e3
Rohs icon
efup china icon
LR8N3-G-P003
0.203400
0.515000
3
TO-92
-
Matte Tin
e3
Rohs icon
efup china icon
LR8N8-G
0.051800
0.132000
3
SOT-89
-
Matte Tin
e3
Rohs icon
efup china icon
LR8K4-G
1.420000
0.501000
3
DPAK
-
Matte Tin
e3
Rohs icon
efup china icon
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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