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PDF RT4720A Data sheet ( Hoja de datos )
| Número de pieza | RT4720A | |
| Descripción | Triple DC/DC Boost Converter | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT4720A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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
1 page  
Timing Diagram
SWIRE Command Timing Diagram
Twait_int < 6ms
TSS1 < 2ms TSS2 < 2ms
SWIRE
0
VO1
0
0
VO2
4.6V
SSD < 4ms -4V
Ten_dly < 400s
Power Sequence
TS_Set < 4ms
VIN
0
ENO3
0
SEL
0
VO3
0
7.7V
RT4720A
Tstop > 300s
2s < Ton < 20s
Toff_dly > 300s
TDIS < 10ms
TD1 = 2ms
-5.2V
2s < Toff < 20s
0
Toff_dly > 300s
TDIS < 10ms
5.8V
0
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4720A-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Typical Operating Characteristics
VO1&VO2 Efficiency vs. Load Current
100
95
90
85
80
75
70
0
VIN = 3.7V, VO1 = 4.6V, VO2 = -4V
0.05 0.1 0.15 0.2 0.25 0.3
Load Current (A)
RT4720A
100
95
90
85
80
75
70
65
60
0
VO3 Efficiency vs. Load Current
VIN = 3.7V, VO3 = 7.7V
10 20 30 40
Load Current (mA)
50
4.64
4.63
4.62
4.61
4.60
4.59
4.58
4.57
4.56
0
VPOS Voltage vs. Load Current
VIN = 3.7V, ILOAD = 0 to 300mA
0.05 0.1 0.15 0.2 0.25 0.3
Load Current (A)
-3.96
-3.97
-3.98
-3.99
-4.00
-4.01
-4.02
-4.03
-4.04
0
VNEG Voltage vs. Load Current
VIN = 3.7V, ILOAD = 0 to 300mA
0.05 0.1 0.15 0.2 0.25 0.3
Load Current (A)
7.74
7.73
7.72
7.71
7.70
7.69
7.68
7.67
7.66
0
AVDD Voltage vs. Load Current
VIN = 3.7V, ILOAD = 0 to 50mA
10 20 30 40
Loader Current (mA)
50
SWIRE
(2V/Div)
VO1
(2V/Div)
VO2
(2V/Div)
IIN
(500mA/Div)
VO1 & VO2 Power On
Time (1ms/Div)
VIN = 3.7V
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS4720A-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet RT4720A.PDF ] | |
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