RT4803A
2.5MHz, Synchronous Boost Regulator
Features
General Description
Input Voltage Range : 1.8V to 5V
Programmable Output Voltage from 2.85V to
4.4V with 50mV/Step
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.
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
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 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.
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
The RT4803A is available in the WL-CSP-16B
1.67x1.67 (BSC) package.
Low
Available in a 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
RT4803A
V
OUT
VIN
LX
V
VOUT
IN
C
IN
L1
C
OUT
VSEL
EN
To pull high voltage
MCU
nBYP
SDA
SCL
R
pull high
GPIO
AGND PGND
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS4803A-06 September 2019
www.richtek.com
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