RT4722C
Triple DC-DC Boost Converter for AMOLED
General Description
Features
Boost Converter to Supply Positive AVDD
The RT4722C is a triple channels DC-DC converter
which is designed to provide the power of AMOLED. It
integrates step up DC-DC and an inverting converter to
provide the positive and negative output voltage
required by AMOLED.
Voltage from 5.8V to 7.9V
Boost Converter to Supply AMOLED Positive
Voltage 4.6V
Inverter Converter to Supply AMOLED Negative
Voltage from 1.4V to 5.4V
For the portable application, board space and
efficiency are always major concerns. The high
switching frequency of the RT4722C allows the use of
low inductance inductor to save the board space. For
the negative and AVDD output voltage, both can be
programmed by external MCU through single wire
(SWIRE pin). The output voltage range of negative
output voltage is 1.4V to 5.4V and AVDD voltage is
5.8V to 7.9V. RT4722C has OTP, SCP, UVLO and
over-current protections. The RT4722C is available in a
WQFN-16L 3x3 package to achieve saving PCB space.
Maximum Output Current up to 300mA for
AMOLED Positive & Negative Power Supply
Maximum Output Current up to 55mA for AVDD
Output Voltage
Typical Peak Efficiency : 90% (40mA to 150mA)
PWM Mode @ 1.5MHz Switching Frequency
High Output Voltage Accuracy
Excellent Line and Load Transient
Excellent Line and Load Regulation
Programmable Negative and AVDD Voltage by
SWIRE Pin
Fast Outputs Discharge Function
Low Quiescent Current < 1A in Shutdown Mode
Internal Soft-Start to limit Inrush Current
Over-Temperature Protection (OTP)
Over-Current Protection (OCP)
Applications
AMOLED Panel
PDAs and Smart Phones
Probable Instrument
Short Circuit Protection (SCP)
Simplified Application Circuit
VBAT
L3
L1
CIN
PVIN
LX3
LX1
VPOS
CVO1
AVDD
CVO3
VO1
VO3
AVIN
CAV
L2
RT4722C
FBS
VPOS_FB
LX2
AVDD Enable
ENO3
FD
SWIRE
VO2
VO1, VO2 Enable and Program VO2
VNEG
CVO2
PGND1 PGND2 AGND
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS4722C-00 September 2017
www.richtek.com
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