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PDF RT8070 Data sheet ( Hoja de datos )
| Número de pieza | RT8070 | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8070
4A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8070 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
RT8070
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
QW : WDFN-8L 3x3 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
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 External Soft-Start
z Power Good Function
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
Marking Information
RT8070ZSP
RT8070
ZSPYMDNN
RT8070ZSP : Product Number
YMDNN : Date Code
RT8070ZQW
25 YM
DNN
25 : Product Code
YMDNN : Date Code
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8070-07 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.net/
1 page  
RT8070
Parameter
Symbol
Test Conditions
Switching Frequency
ROSC = 300k
Switching
EN Input
Voltage
Logic-High VIH
Logic-Low VIL
Switch On-Resistance, High RDS(ON)_P ILX = 0.5A
Switch On-Resistance, Low RDS(ON)_N ILX = 0.5A
Peak Current Limit
ILIM
Under Voltage Lockout
Threshold
VIN Rising
VIN Falling
RT Shutdown Threshold
VRT
VRT Rising
Soft-Start Period
tSS CSS = 10nF
PGOOD Trip Threshold
Min Typ
Max Unit
0.8 1
0.2 --
1.2
MHz
2
1.6 --
-- --
--
V
0.4
-- 110 180 mΩ
-- 70 120 mΩ
4.7 5.8 -- A
-- 2.4
--
V
-- 2.2
--
-- VIN − 0.7 VIN − 0.4 V
-- 800 -- μs
-- 87.5
-- %VOUT
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8070-07 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
Free Datasheet http://www.datasheet4u.net/
5 Page 
Outline Dimension
EXPOSED THERMAL PAD
(Bottom of Package)
J
A
Y
XB
RT8070
H
M
F
C
I
D
Symbol
A
B
C
D
F
H
I
J
M
Option 1
Option 2
X
Y
X
Y
Dimensions In Millimeters
Min Max
4.801
5.004
3.810
4.000
1.346
1.753
0.330
0.510
1.194
1.346
0.170
0.254
0.000
0.152
5.791
6.200
0.406
1.270
2.000
2.300
2.000
2.300
2.100
2.500
3.000
3.500
Dimensions In Inches
Min Max
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.047
0.053
0.007
0.010
0.000
0.006
0.228
0.244
0.016
0.050
0.079
0.091
0.079
0.091
0.083
0.098
0.118
0.138
8-Lead SOP (Exposed Pad) Plastic Package
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8070-07 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
Free Datasheet http://www.datasheet4u.net/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8070.PDF ] | |
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