2.5MHz, Synchronous Boost Regulator


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The RT4803A 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 RT4803A 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 2000mA. Quiescent current in shutdown mode is less than 1μA, which maximizes battery life. The regulator transitions smoothly between bypass and normal boost mode. The device can be forced into bypass mode to reduce quiescent current.

The RT4803A is available in the WL-CSP-16B 1.67x1.67 (BSC) package.


  • Single-Cell Li-Ion, LiFePO4 Smart-Phones or Tablet
  • 2.5G/3G/4G Mini-Module Data Cards
Key Spec.
Status Active
Vin (min) (V) 1.8
Vin (max) (V) 5
Vout (min) (V) 2.85
Vout (max) (V) 4.4
Output Adj. Method Digital
Iq (typ) (mA) 0.055
SW Current Limit (typ) (A) 4
Freq (typ) (kHz) 2500
Freq (min) (kHz) 2000
Freq (max) (kHz) 3000
Ron (typ) (Ohm) 0.04;0.06
Features Adjustable Current Limit;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Internal Compensation;OCP;OVP;UVP
Package Type WL-CSP1.67x1.67-16(BSC)
  • Input Voltage Range : 1.8V to 5V
  • Programmable Output Voltage from 2.85V to 4.4V with 50mV/Step
  • Default Boost Output Voltage Setting :
    ► VOUT = 3.4V at VSEL = H
    ► VOUT = 3.15V at VSEL = L
  • Maximum Continuous Load Current : 2A at VIN > 2.65V Boosting VOUT to 3.35V
  • Up to 95% Efficiency
  • nBYP (L) : Forced Bypass Mode
  • nBYP (H) : Auto Bypass Operation when VIN > Target VOUT
  • Internal Synchronous Rectifier
  • Over-Current Protection
  • Under-Voltage Protection
  • Over-Voltage Protection
  • Over-Temperature Protection
  • Ultra Low Operating Quiescent Current
  • Discharge Function Trigger at GPIO Manual Pull Low
  • Available in a WL-CSP-16B 1.67x1.67 (BSC) Package
TitleLast UpdateShareDownload
2.5MHz, Synchronous Boost Regulator2015/09/01
Technical Documents
TitleLast UpdateShareDownload
Power Mangement Components for Lithium-Ion Battery Powered Applications2018/11/15
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2018/11/15
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT4803AWSCWL-CSP1.67x1.67-16(BSC)3000 Not available Buy from Distributor