High Accuracy Current/Voltage Sensing and Protection IC


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The RT9553B is designed for over-current detection and over-/under-voltage protection.

It provides users to set over-current threshold by the ILIM pin to compare that senses dropping voltage between CSP pin and CSN pin. Moreover, users can set over-/under-voltage threshold by the OVSET pin/UVSET pin to compare with the CSP voltage. The RT9553B is available in the WDFN-10L 3x3 package.


  • Notebook
Key Spec.
Status Active
Vin (min) (V) 5
Vin (max) (V) 24
Amplifier Ratio 100
Channel Number 1
Features Enable Input;OCP;OVP;UVP
Package Type WDFN3x3-10
  • Common Mode Input Range up to 24V
  • VCC Operating Current : 200μA
  • VCC Shutdown Current : 10μA (under S3/S4/S5)
  • Programmable Over-Current Level
  • One Shot PROCHOT Signal when OCP
  • Pull Low RESET Signal when OVP/UVP
  • OVP/UVP with 8% Recover Hysteresis Range
  • Programmable OVP/UVP De-glitch Time
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High Accuracy Current/Voltage Sensing and Protection IC2017/12/01