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RT4803A

2.5MHz, Synchronous Boost Regulator

RT4803A
New

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.

Applications

  • Single-Cell Li-Ion, LiFePO4 Smart-Phones or Tablet
  • 2.5G/3G/4G Mini-Module Data Cards

Key Spec.

RT4803A
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
Interface I2C
Features Adjustable Current Limit;Enable Input;OCP;OVP;UVP
Package Type WL-CSP1.67x1.67-16(BSC)

Features

  • 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

Application Notes

Datasheet

DS4803A-06.pdf

Datasheet

DS4803A-06.pdf

RT4803AWSC
Package Type:WL-CSP1.67x1.67-16(BSC)
Sample Buy
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