Boost Converter. RT4720A Datasheet

RT4720A Converter. Datasheet pdf. Equivalent

RT4720A Datasheet
Recommendation RT4720A Datasheet
Part RT4720A
Description Triple DC/DC Boost Converter
Feature RT4720A; RT4720A Triple DC/DC Boost Converter for AMOLED General Description RT4720A is a triple channels D.
Manufacture Richtek Technology
Datasheet
Download RT4720A Datasheet




Richtek Technology RT4720A
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 RT4720A
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



Richtek Technology RT4720A
Functional Block Diagram
RT4720A
ENO3
AVIN
PVIN
UVLO
PVIN Switching VO3
Well
LX3
ZCD3
SCP3
VO3
Bandgap VR1
Reference
SEL
SEL
VR1
R1A
R1B
Soft-start VSEL
FB3
GM
GM VRX
OCP3
1.5MHz
OSC
Swire
Pulse Dimming
VRX
VRX
OCP1 Soft-start
GM
FB1
RDIMP
RDIMN
Soft-
start
FB2
GM
OCP2
PWM
Logic
P3
N3
RP6
FB3
RP5
PVIN1 Switching VO1
Well
PWM
Logic
N1
P1
SCP1
LX1
VO1
FBS
RP2
FB1
RP1
PWM
Logic
PVIN
NN1
LX2
NN2
SCP2
VO2
VO2
Fast Discharge
VO1
VO2
VO3
OTP
AGND PGND1 PGND2
Operation
The RT4720A is a triple channels DC/DC converter
which is designed to provide the power of AMOLED
that can support the input voltage range from 2.9V to
4.5V. The VO1&VO2 output current can be up to
300mA, and the VO3 output current can be up to 50mA.
The RT4720A uses current mode architecture for the
purpose of high efficiency and high transient response.
The VO1 positive output voltage is produced from the
DC/DC Boost converter and is set at a typical value of
4.6V. When the SWIRE goes high, the positive output
voltage will be enabled with an internal soft-start
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4720A-00 May 2016
process. The VO2 negative output voltage is produced
from the DC/DC Buck-Boost converter and the
negative output voltage range is -1.4V to -5.4V. It can
be programmed by external MCU through single wire
(SWIRE pin). The VO3 positive output voltage is
produced from the DC/DC Boost converter and is set at
a fixed 7.7V or 5.8V by SEL pin. When SWIRE goes
high and VO1 soft-start had finished already, negative
output voltage VO2 will be enabled with an internal
soft-start process.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)