The KTB1100 is a highly integrated isolated flyback regulator with integrated power MOSFET switch, internal feedback, and integrated digital isolator. The internal digital isolated eliminates the need to use an external optocoupler and enables small total solution size. The device operates over a wide input voltage range from 7V to 100V to support a variety of applications.

The KTB1100 employs current-mode constant on-time (COT) control for fast transient response as well as superior output voltage regulation. The device features an adjustable soft-start function to limit inrush current during start-up. The device has integrated protection features including input voltage UVLO, output overvoltage protection (OVP), cycle-by-cycle current limit, short-circuit protection and thermal shutdown.

The KTB1100 is available in RoHS and Green compliant SOIC-16 package.


  • Wide VIN Range: 7V to 100V
  • Integrated 1.5A, 150V Power MOSFET Switch
  • 430mΩ (typ.) on-resistance of MOSFET Switch
  • Integrated Feedback and Digital Isolator
  • Internal Startup Regulator
  • ±1.5% Feedback Voltage Reference
  • 3kV-rms Isolation
  • Frequency Adjustable from 100kHz to 1MHz
  • Adjustable Soft-Start Time
  • Precision Enable for Adjustable UVLO
  • Optional Primary Side Bias for Optimized Efficiency
  • Integrated Cycle-by-Cycle Current Limit, Input UVLO, Over Current Protection, Short-Circuit Protection, and Thermal Shutdown Protection
  • SOIC-16 Wide Body (10.3mm x 7.5mm)
  • -40°C to 125°C Operating Junction Temperature Range
  • Safety Certification: UL1577 (No. E517623)


  • Battery Management System (BMS) in EVs
  • Telecom and Communications Power Systems
  • Industrial PLCs
  • Smart Meters
  • Power-Over-Ethernet (PoE) PD
  • Bias supply for isolated DC-DC converters
  • Low-power isolated power modules

Packaging Information

Package Dimensions Bumps Package Code
SOIC-16 10.30mm x 7.50mm x 2.65mm 16 YAA


Vin (min)  Vin (max)  Switching Frequency Max Current (A)
7.0V 100.0V 100kHZ to 1000kHz 1.5A

Technical Documentation

Description Documents Type
Package Outline DrawingSOIC-16 YAA PODPDF

Evaluation Tools

Documents Type
User ManualPDF
Quick Start GuidePDF
Bill of MaterialsXLSX
3D BoardPDF


Part Number Marking Operating Temperature Package
KTB1100EYAA-TE XXYYZ -40°C to +85°C SOIC-16
Purchase Options
Buy from Digi-Key
Buy from Mouser