LR645N8-G Supertex, LR645N8-G Datasheet

Linear Regulators - Standard Fixed/Adj Hi In V

LR645N8-G

Manufacturer Part Number

LR645N8-G

Description

Linear Regulators - Standard Fixed/Adj Hi In V

Manufacturer

Supertex

Datasheet

1.LR645N8-G.pdf (9 pages)

Specifications of LR645N8-G

Polarity

Positive

Number Of Outputs

Output Type

Fixed

Output Voltage

1.7 V

Output Current

3 mA

Line Regulation

200 mV

Load Regulation

400 mV

Input Voltage Max

450 V

Maximum Operating Temperature

+ 150 C

Minimum Operating Temperature

- 55 C

Maximum Power Dissipation

1600 mW

Mounting Style

SMD/SMT

Package / Case

SOT-89 (TO-243AA)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LR645N8-G

Manufacturer:

Supertex

Quantity:

135

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Features

►

Applications

►

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

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

GND

8-Lead SOIC (LG)

TRIM

TO-243AA (SOT-89)

TO-220 (N5)

+VIN

●

LR645N8-G

Tel: 408-222-8888

+VIN

GND

VOUT

GND

VOUT

●

www.supertex.com

TO-243AA (SOT-89) (N8)

GND

VOUT

TO-92 (N3)

VIN

GND

LR645

VOUT

GND

Related parts for LR645N8-G

LR645N8-G Summary of contents

Page 1

... Pin Conﬁgurations Value 450V GATE NC 15.5V -55°C to +150 C O 300 C O 8-Lead SOIC (LG) GND ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 TO-243AA (SOT-89) LR645N8-G TRIM NC VOUT VOUT GND NC +VIN TO-92 (N3) GND VOUT +VIN GND TO-220 (N5) TO-243AA (SOT-89) (N8) ● Tel: 408-222-8888 ● ...

Page 2

... V ≥ V +1V applied to V AUX OUT - dB 120Hz, No Load - µV 0.01 to 100KHz - 10µ 400V OUT IN 13.2 V --- load 400 15V 1.0mA IN OUT 400 50V 3.0mA IN OUT ● Tel: 408-222-8888 ● www.supertex.com LR645 θ C/W) O 400* 170 70 78* pin OUT pin OUT ...

Page 3

... Applications requiring higher output current and/or a different output voltage can use the 8 pin adjustable version PWM IC C OUT ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 3 V OUT GATE GND + 5.0V – 12V AUX ● Tel: 408-222-8888 ● www.supertex.com LR645 ...

Page 4

... MOSFET for higher output current and external resistors for adjustable output voltage. As shown in Figure 2, the output current is increased to 150mA by using the Supertex 400V depletion-mode MOSFET DN2540. The maximum operating input voltage will be limited by the drain- to-source breakdown voltage of the external MOSFET, but cannot exceed the 450V rating of the LR645 ...

Page 5

... Figure 5: Typical Output Voltage vs Resistor Ratio DN2540N5 GATE V LR645LG C IN GND 250KΩ 8 2.5 3.0 Resistor Ratio (R2/R1) ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 5 5.0V 5.0V OUT REG + 0 to 150mA C OUT – 3.5 4.0 ● Tel: 408-222-8888 ● www.supertex.com LR645 ...

Page 6

... Dimension NOM - - (mm) MAX 1.75 0.25 JEDEC Registration MS-012, Variation AA, Issue E, Sept. 2005. * This dimension is not speciﬁed in the original JEDEC drawing. The value listed is for reference only. Drawings are not to scale. Supertex Doc. #: DSPD-8SOLGTG, Version H101708 Note 1 Seating Plane ...

Page 7

... Dimensions NOM - (inches) MAX .210 JEDEC Registration TO-92. * This dimension is not speciﬁed in the original JEDEC drawing. The value listed is for reference only. † This dimension is a non-JEDEC dimension. Drawings not to scale. Supertex Doc.#: DSPD-3TO92N3, Version D080408 Front View E E1 ...

Page 8

... JEDEC Registration TO-220, Variation AB, Issue K, April 2002. * This dimension is not speciﬁed in the original JEDEC drawing. The value listed is for reference only. † This dimension is a non-JEDEC dimension. Drawings not to scale. Supertex Doc. #: DSPD-3TO220N5, Version B090308 Φ Side View ...

Page 9

... Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship ...

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