LR645N8G Supertex, LR645N8G Datasheet
LR645N8G
Manufacturer Part Number
LR645N8G
Description
SOT89
Manufacturer
Supertex
Datasheet
1.LR645N8G.pdf
(9 pages)
Specifications of LR645N8G
Date_code
07+
Features
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Applications
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Absolute Maximum Ratings
Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability. All
voltages are referenced to device ground.
*
Ordering Information
-G indicates package is RoHS compliant (‘Green’)
Parameter
Input voltage
Output voltage
Operating and storage temperature
Soldering temperature*
Caution!
The LR645 does NOT provide galvanic isolation.
When operated from an AC line, potentially lethal
voltages can be present on the IC. Adequate means
of protecting the end user from such voltages must be
provided by the circuit developer.
Distance of 1.6mm from case for 10 seconds.
Device
LR645
Accepts inputs from 15 to 450V
Output currents up to 3.0mA continuous, 30mA peak
Supply current typically 50µA
Line regulation typically 0.1mV/V
Output can be trimmed from 8.0 to 12V
Output current can be increased to 150mA with
external FET
Off-line SMPS startup circuits (pulse loads)
Low power off-line regulators
Regulators for noisy inputs
High Input Voltage SMPS Start-up / Linear Regulator
8-Lead SOIC
LR645LG-G
●
LR645N3-G
1235 Bordeaux Drive, Sunnyvale, CA 94089
TO-92
-55°C to +150
Package Options
300
Value
15.5V
450V
LR645N5-G
O
O
C
C
TO-220
General Description
The Supertex LR645 is a high input voltage, low output
current linear regulator. It has a 3-terminal fixed output voltage
version available in TO-92, TO-220 and SOT-89 packages,
as well as an adjustable voltage version available in an 8-
lead SOIC package. The 3-terminal version functions like any
other low voltage 3-terminal regulator except it allows the use
of much higher input voltages. When used in a SMPS start-
up circuit, it eliminates the need for large power resistors. In
this application, current is drawn from the high voltage line
only during start-up. Only leakage current flows after start-up,
thereby reducing the continuous power dissipation to a few
milliwatts.
The adjustable voltage version allows trimming of the output
voltage from 8.0 to 12V. This version can also be connected
to an external depletion mode MOSFET for increased output
current. When used in conjunction with Supertex depletion
mode MOSFET DN2540N5, an output current of up to 150mA
is achieved.
Pin Configurations
GATE
NC
GND
8-Lead SOIC (LG)
NC
TRIM
TO-243AA (SOT-89)
TO-220 (N5)
+VIN
●
LR645N8-G
Tel: 408-222-8888
+VIN
GND
NC
VOUT
GND
VOUT
●
www.supertex.com
TO-243AA (SOT-89) (N8)
GND
VOUT
TO-92 (N3)
VIN
VIN
GND
LR645
VOUT
GND
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