High Efficiency Boost Converter


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The RT4812 allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current; this IC provides a compact solution for systems using advanced Li-Ion battery chemistries.

The RT4812 is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 2.1A. Quiescent current in Shutdown Mode is less than 1μA, which maximizes battery life.


  • Single-Cell Li-Ion, LiFePO4 Smart-Phones
  • Portable Equipment
Key Spec.
Status Active
Vin (min) (V) 1.8
Vin (max) (V) 5.5
Vout (min) (V) 1.8
Vout (max) (V) 5.5
Output Adj. Method Resistor
Iq (typ) (mA) 0.09
SW Current Limit (typ) (A) 3.5
Freq (typ) (kHz) 500
Ron (typ) (Ohm) 0.03;0.045
Features Enable Input;OCP;OVP;UVP
Package Type TSOT-28(FC)
  • CMCOT Topology and Small Output Ripple when VIN close VOUT Voltage
  • Operates from a Single Li-ion Cell : 1.8V to 5.5V
  • Adjustable Output Voltage : 1.8V to 5.5V
  • PSM Operation
  • Up to 96% Efficiency
  • Boost Current Limit
  • Output Over Voltage Protection
  • Pin Adjustable Average Output Current Limit Threshold (2 Levels)
  • Internal Compensation
  • Output Discharge
  • Output Short Protection
  • True Load Disconnect
TitleLast UpdateShareDownload
High Efficiency Boost Converter2015/02/05
Technical Documents
TitleLast UpdateShareDownload
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2020/12/30
Power Mangement Components for Lithium-Ion Battery Powered Applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT4812GJ8FTSOT-28(FC)3000 Not available Buy from Distributor