Analog Devices Inc. LT830x Micropower Isolated Flyback Converters

Analog Devices Inc. LT830x Micropower Isolated Flyback Converters simplify the design of an isolated DC/DC converter. The LT830x from Analog Devices requires no third winding or optoisolator for regulation, due to sampling the isolated output voltage directly from the primary-side flyback waveform.

The converters maintain high efficiency battery run times at light load with low quiescent current in low output ripple Burst Mode® operation. The flyback converters have a low component count, and high efficiency application solution for isolated power delivery with a high level of integration.

Features

LT8300
- 6V to 100V input voltage range
- 260mA, 150V internal DMOS power switch
- Low Quiescent Current
  - 70μA in sleep mode
  - 330μA in active mode
- Boundary mode operation at heavy load
- Low-ripple Burst Mode® operation at light load
- Minimum load <0.5% (typ.) of full output
- V_OUT set with a single external resistor
- No transformer third winding or optoisolator required for regulation
- Accurate EN/UVLO threshold and hysteresis
- Internal compensation and soft-start
- 5-lead TSOT-23 package
LT8301
- 2.7V to 42V input voltage range
- 1.2A, 65V internal DMOS power switch
- Low Quiescent Current
  - 100μA in sleep mode
  - 350μA in active mode
- Boundary mode operation at heavy load
- Low-ripple Burst Mode operation at light load
- Minimum load <0.5% (typ.) of full output
- V_OUT set with a single external resistor
- No transformer third winding or optoisolator required for regulation
- Accurate EN/UVLO threshold and hysteresis
- Internal compensation and soft-start
- Output short-circuit protection
- 5-lead TSOT-23 package

LT8302
- 2.8V to 42V input voltage range
- 3.6A, 65V internal DMOS power switch
- Low Quiescent Current
  - 106μA in sleep mode
  - 380μA in active mode
- Quasi-resonant boundary mode operation at heavy load
- Low ripple Burst Mode operation at light load
- Minimum load < 0.5% (typ.) of full output
- No transformer third winding or optoisolator required for output voltage regulation
- Accurate EN/UVLO threshold and hysteresis
- Internal compensation and soft-start
- Temperature compensation for output diode
- Output short-circuit protection
- Thermally enhanced 8-lead SO package
LT8303
- 5.5V to 100V input voltage range
- 450mA, 150V internal DMOS power switch
- Up to 5W of output power
- Low Quiescent Current
  - 70μA in sleep mode
  - 280μA in active mode
- Boundary mode operation at heavy load
- Low-ripple Burst Mode operation at light load
- Minimum load <0.5% (typ.) of full output
- V_OUT set with a single external resistor
- No transformer third winding or optoisolator
- Required for regulation
- Accurate EN/UVLO threshold and hysteresis
- Internal compensation and soft-start
- 5-lead TSOT-23 package