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Product attributes Property Value
Manufacturer Monolithic Power Systems Inc.
Product Series
Packaging Tape & Reel (TR) |
Output Isolation Non-Isolated
Internal Switch(s) Yes
Voltage - Breakdown 500V
Topology Boost, Buck, Buck-Boost, Flyback
Voltage - Start Up -
Voltage - Supply (Vcc/Vdd) 5.3V ~ 5.6V
Duty Cycle -
Frequency - Switching -
Power (Watts) 4 W
Fault Protection Open Loop, Over Load, Over Temperature, Short Circuit
Control Features -
Operating Temperature -40°C ~ 125°C (TJ)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case SOT-23-5 Thin, TSOT-23-5
Supplier Device Package TSOT-23-5
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The MP155GJ-P from Monolithic Power Systems is a versatile offline converter controller that supports Boost, Buck, Buck-Boost, and Flyback topologies in a single device. It integrates a 500V switch and operates from a 5.3V to 5.6V Vcc supply, delivering up to 4 W. Housed in a compact TSOT-23-5 package, it includes open-loop, over-load, over-temperature, and short-circuit protection across a -40°C to 125°C junction range.

  • Multi-topology flexibility (Boost, Buck, Buck-Boost, Flyback) simplifies BOM consolidation across designs.
  • Integrated 500V switch reduces external component count and board space.
  • Compact TSOT-23-5 package suits space-constrained offline supplies.
  • Comprehensive protection set (open loop, over load, over temperature, short circuit) improves reliability.
  • Wide -40°C to 125°C junction range supports demanding environments.

Compact Offline Bias Supplies

The MP155GJ-P's integrated 500V switch and multi-topology flexibility make it well suited to small offline bias supplies where a compact SOT-23-5 footprint is essential.

Non-Isolated Auxiliary Rails

Operating as a non-isolated Buck or Buck-Boost converter, it can generate low-power auxiliary rails directly from a rectified mains input with minimal external components.

Low-Power Flyback Designs

When isolation is required, the Flyback configuration supports up to 4 W, ideal for gate-drive or housekeeping supplies.

Boost Pre-Regulation

The Boost topology option enables step-up conversion for front-end regulation in space-constrained adapters.

Harsh Environment Electronics

With a -40°C to 125°C junction temperature range, it suits industrial controls and outdoor enclosures.

Q: What switching topologies does the MP155GJ-P support?
A: It supports Boost, Buck, Buck-Boost, and Flyback topologies in a single controller.
Q: Is the power switch integrated?
A: Yes, the MP155GJ-P integrates the switch with a 500V breakdown voltage rating.
Q: What is the Vcc supply range?
A: The IC operates from a 5.3V to 5.6V Vcc supply.
Q: What power level is it rated for?
A: It delivers up to 4 W of output power.
Q: What protections are included?
A: Open loop, over load, over temperature, and short circuit protection.
Base Product Number : MP155GJ-P
4W 500V AC-DC Boost Converter Buck Converter Buck-Boost Converter Flyback Converter Non-Isolated Offline Converter TSOT-23-5
Q: What switching topologies does the MP155GJ-P support?
A: It supports Boost, Buck, Buck-Boost, and Flyback topologies in a single controller.
Q: Is the power switch integrated?
A: Yes, the MP155GJ-P integrates the switch with a 500V breakdown voltage rating.
Q: What is the Vcc supply range?
A: The IC operates from a 5.3V to 5.6V Vcc supply.
Q: What power level is it rated for?
A: It delivers up to 4 W of output power.
Q: What protections are included?
A: Open loop, over load, over temperature, and short circuit protection.