LT8300

1

Rev. A

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Converter with 150V/260mA Switch

The LT®8300 is a micropower high voltage isolated fly-

back converter. By sampling the isolated output voltage

directly from the primary-side flyback waveform, the part

requires no third winding or opto-isolator for regulation.

The output voltage is programmed with a single exter-

nal resistor. Internal compensation and soft-start further

reduce external component count. Boundary mode opera-

tion provides a small magnetic solution with excellent load

regulation. Low ripple Burst Mode operation maintains

high efficiency at light load while minimizing the output

voltage ripple. A 260mA, 150V DMOS power switch is

integrated along with all high voltage circuitry and control

logic into a 5-lead ThinSOT™ package.

The LT8300 operates from an input voltages range of 6V

to 100V and can deliver up to 2W of isolated output power.

The high level of integration and the use of boundary

and low ripple burst modes result in a simple to use, low

component count, and high efficiency application solution

for isolated power delivery.

5V Micropower Isolated Flyback Converter

APPLICATIONS

n

6V to 100V Input Voltage Range

n

260mA, 150V Internal DMOS Power Switch

n

Low Quiescent Current

n

70µA in Sleep Mode

n

330µA in Active Mode

n

Boundary Mode Operation at Heavy Load

n

n

Minimum Load <0.5% (Typ) of Full Output

n

n

No Transformer Third Winding or Opto-Isolator

Required for Regulation

n

Accurate EN/UVLO Threshold and Hysteresis

n

Internal Compensation and Soft-Start

n

5-Lead TSOT-23 Package

n

AEC-Q100 Qualified for Automotive Applications

n

Isolated Telecom, Automotive, Industrial, Medical

Power Supplies

n

Isolated Auxiliary/Housekeeping Power Supplies

Efficiency vs Load Current

LT8300

4:1

SW

300µH

19µH

EN/UVLO

1M

2.2µF

40.2k

36V TO 72V

5V

1mA TO 300mA

GND

210k

•

•

47µF

8300 TA01a

LOAD CURRENT (mA)

100

20

30

90

40

10

60

70

80

50

0

8300 TA01b

300

250

200

150

100

50

0

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by U.S. Patents, including 5438499, 7463497, and 7471522.