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PDF RT8260A Data sheet ( Hoja de datos )
| Número de pieza | RT8260A | |
| Descripción | 1.4MHz Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8260A (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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RT8260A
1.8A, 24V, 1.4MHz Step-Down Converter
General Description
The RT8260A is a high voltage buck converter that can
support the input voltage range from 4.5V to 24V and the
output current can be up to 1.8A. Current Mode operation
provides fast transient response and eases loop
stabilization.
The chip also provides protection functions such as cycle-
by-cycle current limiting and thermal shutdown protection.
The RT8260A is available in a WDFN-8L 2x2 package.
Ordering Information
RT8260A
Package Type
QW : WDFN-8L 2x2 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Marking Information
JGW
JG : Product Code
W : Date Code
Features
z Wide Operating Input Voltage Range : 4.5V to 24V
z Adjustable Output Voltage Range : 0.8V to 15V
z 1.8A Output Current
z 0.3Ω Internal Power MOSFET Switch
z High Efficiency up to 92%
z 1.4MHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Thermal Shutdown
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and Halogen Free
Applications
z Distributed Power Systems
z Battery Charger
z Pre-Regulator for Linear Regulators
z WLEDDrivers
Pin Configurations
http://www.DataSheet4U.net/
(TOP VIEW)
NC 1
SW 2
VIN 3
EN 4
8 NC
7 BOOT
6 GND
9 5 FB
WDFN-8L 2x2
Typical Application Circuit
VIN
4.5V to 24V
CIN
10µF
Chip Enable
3 VIN BOOT 7
RT8260A
SW 2
4 EN
FB 5
CBOOT L1
10nF 4.7µH
D1
B230A
Open =
GND
Automatic Startup
6, 9 (Exposed Pad)
VOUT
3.3V
R1
62k
R2
19.6k
COUT
22µF
DS8260A-03 March 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Typical Operating Characteristics
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs. Load Current
VIN = 12V
VIN = 24V
VOUT = 5V
0.3 0.6 0.9 1.2 1.5 1.8
Load Current (A)
RT8260A
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs. Load Current
VIN = 12V
VIN = 24V
VOUT = 3.3V
0.3 0.6 0.9 1.2 1.5 1.8
Load Current (A)
Output Voltage vs. Load Current
3.336
Reference Voltage vs. Temperature
0.815
3.331
0.810
3.326
0.805
3.321
3.316
http://www.DataSheet4U.net/
0.800
0.795
3.311
3.306
0
VIN = 12V
0.3 0.6 0.9 1.2 1.5 1.8
Load Current (A)
0.790
0.785
-50
-25
VIN = 12V, IOUT = 0A
0 25 50 75
Temperature (°C)
100 125
Current Limit vs. Duty Cycle
3.8
Current Limit vs. Temperature
3.8
3.5 3.5
3.2 3.2
2.9 2.9
2.6 2.6
2.3
2.0
0
16 32 48 64
Duty Cycle (%)
80
2.3
2.0
-50
-25
VIN = 12V, VOUT = 3.3V
0 25 50 75
Temperature (°C)
100 125
DS8260A-03 March 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
GND
COUT VOUT
The feedback components
must be connected as close
to the device as possible.
The input capacitor
must be placed as
close to the IC as
possible.
VIN
D
CIN
L
RS CS
SW
NC 1
SW 2
VIN 3
EN 4
8 NC
7 BOOT
6 GND
9 5 FB
R1
R2
GND
SW should be connected to inductor by wide and
short trace. Keep sensitive components away
from this trace.
Figure 5. PCB Layout Guide
RT8260A
Table 4. Suggested Capacitors for CIN and COUT
Location Component Supplier
Part No.
Capacitance (µF) Case Size
CIN
MURATA
GRM31CR61E106K
CIN
TDK
C3225X5R1E106K
CIN
TAIYO YUDEN
TMK316BJ106ML
10
10
10
1206
1206
1206
COUT
COUT
COUT
MURATA
TDK
TAIYO YUDEN
GRM31CR61C226M
C3225X5R1C226M
w/p/hwt:twD.atShee4tUn.e/t
EMK316BJ226ML
22
22
22
1206
1206
1206
DS8260A-03 March 2011
www.richtek.com
11
dawts/hp/hwte:pt-edtwfD.atShee4tUn.e/t
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8260A.PDF ] | |
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