RT4803
2.5MHz, Synchronous Boost Regulator with Bypass Mode
Features
General Description
4 Few External Components : 0.47H Inductor
and 0603 Case Size Input and Output Capacitors
Input Voltage Range : 1.8V to 5V
Output Range from 2.85V to 4.4V
VSEL = L 3.3V
The RT4803 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.
VSEL = H 3.55V
Maximum Continuous Load Current : 2A at VIN
2.65V Boosting VOUT to 3.35V
>
The RT4803 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 2A.
Quiescent current in Shutdown Mode is less than 1A,
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.
Up to 96% Efficient
True Bypass Operation when VIN > Target VOUT
Internal Synchronous Rectifier
Soft-Start with True Load Disconnect
Forced Bypass Mode
VSEL Control to Optimize Target VOUT
Short-Circuit Protection
I2C Controlled Interface
Ultra low Operating Quiescent Current
Small WL-CSP 16B Package
Discharge Function
The RT4803 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
Simplified Application Circuit
RT4803
VOUT
VIN
C
IN
C
OUT
+
-
L1
LX
To pull high voltage
VSEL
EN
nBYP
PGOOD
SDA
SCL
AGND PGND
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS4803-03 January 2020
www.richtek.com
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