ON Semiconductor


1.5 A 280 kHz/560 kHz Boost Regulators

Topology: Boost
Input Voltage (min.): 2.70 V
Input Voltage (max.): 30.00 V
Switching Frequency (min.): 230.00 kHz
Switching Frequency (max.): 310.00 kHz
Output 1: V / 1.500 A

Original publication on 2010-01-19, revision 23


The CS5171/2/3/4 products are 280 kHz/560 kHz switching regulators with a high efficiency, 1.5 A integrated switch. These parts operate over a wide input voltage range, from 2.7 V to 30 V. The flexibility of the design allows the chips to operate in most power supply configurations, including boost, flyback, forward, inverting, and SEPIC. The ICs utilize current mode architecture, which allows excellent load and line regulation, as well as a practical means for limiting current. Combining high frequency operation with a highly integrated regulator circuit results in an extremely compact power supply solution. The circuit design includes provisions for featuressuch as frequency synchronization, shutdown, and feedback controls for either positive or negative voltage regulation. These parts are pin−to−pin compatible with LT1372/1373.


  • Integrated Power Switch: 1.5 A Guaranteed
  • Wide Input Range: 2.7 V to 30 V
  • High Frequency Allows for Small Components
  • Minimum External Components
  • Easy External Synchronization
  • Built in Overcurrent Protection
  • Frequency Foldback Reduces Component Stress During anOvercurrent Condition
  • Thermal Shutdown with Hysteresis
  • Regulates Either Positive or Negative Output Voltages
  • Shut Down Current: 50 A Maximum
  • Pin−to−Pin Compatible with LT1372/1373
  • Wide Temperature Range
  • Industrial Grade: −40°C to 125°C
  • Commercial Grade: 0°C to 125°C
  • Pb−Free Packages are Available


  Order Code SPEC Product series L
RDC typ.
RDC max.
Bauform Version Samples
744771133 PDF WE-PD SMT Power Inductor 33 2.68 3 49 57 11 1260 Standard