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  Richtek Technology Electronic Components Datasheet  

RT4720A Datasheet

Triple DC/DC Boost Converter

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RT4720A
Triple DC/DC Boost Converter for AMOLED
General Description
RT4720A 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.
For the portable application, board space and
efficiency are always major concerns. The high
switching frequency of RT4720A allows the use of low
inductance inductor to save the board space. It
provides dual positive output voltage, one is a fixed
5.8V or 7.7V output voltage by SEL pin and the other
positive output is fixed 4.6V. For the negative output
voltage, it 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.
RT4720A has OTP, SCP, UVLO and over current
protections. The RT4720A is available in a WQFN
-16L 3x3 package to achieve saving PCB space.
Features
Boost Converter to Supply Positive AVDD
Voltage Fixed 5.8V or 7.7V
Boost Converter to Supply AMOLED Positive
Voltage 4.6V
Inverter Converter to Supply AMOLED Negative
Voltage From -1.4V to -5.4V
Maximum Output Current up to 300mA for
AMOLED Positive & Negative Power Supply
Maximum Output Current up to 50mA for Fixed
5.8V or 7.7V 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 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)
Short Circuit Protection (SCP)
Applications
Cellular Phones
Digital Cameras
PDAs and Smart Phones
Probable Instrument
Simplified Application Circuit
VBAT
(2.9V to 4.5V)
L1 L3
VPOS
CVO1
VPOS_FB
AVDD Enable
VO1, VO2 Enable and Program VO2
CIN
LX1
VO1
FBS
PVIN
LX3
VO3
AVIN
RT4720A
ENO3
SEL
SWIRE
LX2
VO2
PGND1 PGND2 AGND
CAV
L2
AVDD
CVO3
CVO2
VNEG
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4720A-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT4720A Datasheet

Triple DC/DC Boost Converter

No Preview Available !

RT4720A
Ordering Information
RT4720A
Package Type
QW : WQFN-16L 3x3
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering
processes.
Marking Information
7Y=YM
DNN
7Y= : Product Code
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
16 15 14 13
LX1
PGND1
VO1
FBS
1
2
3
4
AGND
17
12 PVIN
11 LX2
10 VO2
9 SWIRE
5 678
WQFN-16L 3x3
Functional Pin Description
Pin No.
1
2
3
4
Pin Name
LX1
PGND1
VO1
FBS
5 SEL
6 NC
7,
17 (Exposed Pad)
AGND
8 ENO3
Pin Function
1st Boost Converter Switching Node.
Power Ground.
1st Boost Converter Output.
1st Boost Converter Output Feedback Sense.
2nd Boost Converter Output Voltage Select Pin.
High = 5.8V, Low = 7.7V Output, Default Floating.
No Connected.
Signal Ground. The exposed pad must be soldered to a large PCB and
connected to AGND for maximum power dissipation.
2nd Boost Enable/Disable Pin.
9
SWIRE
VPOS, VNEG Control Pin (Enable/Disable Pin).
10 VO2
Buck/Boost Converter Output (Negative Voltage).
11 LX2
Buck/Boost Converter Switching Node.
12 PVIN
13 VO3
Power Input Voltage.
2nd Boost Converter Output.
14 PGND2 Power Ground.
15 LX3
2nd Boost Converter Switching Node.
16 AVIN
Analog Input Voltage.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS4720A-00 May 2016


Part Number RT4720A
Description Triple DC/DC Boost Converter
Maker Richtek Technology
Total Page 17 Pages
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