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PDF RT8074 Data sheet ( Hoja de datos )
| Número de pieza | RT8074 | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8074 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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®
RT8074
4A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8074 is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range is from 2.7V to
5.5V and provides an adjustable regulated output voltage
from 0.8V to 5V while delivering up to 4A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The default switching
frequency is set at 2MHz, if the RT pin is left open. It can
also be varied from 200kHz to 2MHz by adding an external
resistor. Current mode operation with external
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
Ordering Information
RT8074
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z High Efficiency : Up to 95%
z Adjustable Frequency : 200kHz to 2MHz
z No Schottky Diode Required
z 0.8V Reference Allows Low Output Voltage
z Low Dropout Operation : 100% Duty Cycle
z Enable Function
z Internal Soft-Start
z RoHS Compliant and Halogen Free
Applications
z LCD TV and Monitor
z Notebook Computers
z Distributed Power Systems
z IP Phones
z Digital Cameras
Pin Configurations
(TOP VIEW)
COMP
GND
EN
VIN
8
27
GND
3 96
45
FB
RT
LX
LX
SOP-8 (Exposed Pad)
Typical Application Circuit
VIN
2.7V to 5.5V
CIN
10µF
ROSC
4
RT8074
VIN
LX
5, 6
L
1.5µH
3 EN
7 RT
FB 8
COMP 1
RCOMP
10k
GND 2,
9 (Exposed Pad)
R1
750
CCOMP
560pF
R2
2k
VOUT
1.1V
COUT
22µF
Note : Using all Ceramic Capacitors
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8074-07 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Typical Operating Characteristics
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs. Output Current
VIN = 5V, VOUT = 1.1V, IOUT = 0 to 4A
0.5 1 1.5 2 2.5 3 3.5 4
Output Current (A)
Switching Frequency vs. Temperature
1.10
1.09
1.08
1.07
1.06
1.05
1.04
1.03
1.02
1.01
1.00
-50
-25
VIN = 5V, VOUT = 1.1V, IOUT = 0.6A
0 25 50 75
Temperature (°C)
100 125
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
-50
VIN UVLO vs. Temperature
Rising
Falling
VOUT = 1.1V
-25 0 25 50 75 100 125
Temperature (°C)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8074-07 November 2012
RT8074
1.112
Output Voltage vs. Output Current
1.110
1.108
1.106
1.104
1.102
1.100
1.098
1.096
1.094
VIN = 5V, VOUT = 1.1V, IOUT = 0 to 4A
0 0.5 1 1.5 2 2.5 3 3.5 4
Output Current (A)
Reference Voltage vs. Temperature
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
-50
-25
VIN = 5V, VOUT = 1.1V
0 25 50 75
Temperature (°C)
100 125
Enable Voltage vs. Temperature
1.4
1.3
1.2 Rising
1.1
1.0 Falling
0.9
0.8
0.7
0.6
-50
-25
VOUT = 1.1V
0 25 50 75
Temperature (°C)
100 125
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT8074.PDF ] | |
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