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PDF RT8267 Data sheet ( Hoja de datos )
| Número de pieza | RT8267 | |
| Descripción | 400kHz Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8267 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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RT8267
2A, 22V, 400kHz Step-Down Converter
General Description
The RT8267 is an asynchronous high voltage buck
converter that can support the input voltage range from
4.75V to 22V and the output current can be up to 2A.
Current Mode operation provides fast transient response
and eases loop stabilization.
The chip provides protection functions such as cycle-by-
cycle current limiting and thermal shutdown protection.
In shutdown mode, the regulator draws 25μA of supply
current. The RT8267 is available in a SOP-8 surface mount
package.
Ordering Information
RT8267
Package Type
S : SOP-8
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.
Typical Application Circuit
Features
z Wide Operating Input Range : 4.75V to 22V
z Adjustable Output Voltage Range : 1.222V to 16V
z Output Current up to 2A
z 25μA Low Shutdown Current
z Power MOSFET : 0.18Ω
z High Efficiency up to 95%
z 400kHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Thermal Shutdown Protection
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and Halogen Free
Applications
z Distributive Power Systems
z Battery Charger
z DSL Modems
z Pre-regulator for Linear Regulators
Pin Configurations
http://www.DataSheet4U.net/
(TOP VIEW)
BOOT
VIN
SW
GND
2
3
4
8 NC
7 EN
6 COMP
5 FB
SOP-8
VIN
4.75V to 22V
Chip Enable
CIN
10µF
2 VIN
BOOT 1
RT8267
SW 3
7 EN
FB 5
4 GND
COMP 6
CB L1
10nF 15µH
D1
B330
RC
10k
CC
1.5nF
R1
17k
R2
10k
VOUT
3.3V/2A
COUT
22µF
CP
NC
DS8267-02 March 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Typical Operating Characteristics
Efficiency vs. Output Current
100
95
VIN = 12V
90
85
80 VIN = 15V
75 VIN = 22V
70
65
60
55
50
45
40
0
VOUT = 3.3V
0.4 0.8 1.2 1.6
2
Output Current (A)
RT8267
Reference Voltage vs. Input Voltage
1.2540
1.2440
1.2340
1.2240
1.2140
1.2040
1.1940
1.1840
VIN = 4.75V to 22V, VOUT = 3.3V
4.5 6 7.5 9 10.5 12 13.5 15
Input Voltage (V)
Output Voltage vs. Temperature
3.400
3.300
Output Voltage vs. Output Current
3.375
3.350
3.325
3.300
3.275
3.250
3.225
3.200
-50
-25
VIN = 12V, VOUT = 3.3V
0 25 50 75
Temperature (°C)
100 125
http://www.DataSheet4U.net/
3.297
3.294
3.291
3.288
3.285
3.282
3.279
3.276
3.273
3.270
0
VIN = 12V
VIN = 15V
VIN = 22V
VOUT = 3.3V
0.4 0.8 1.2 1.6
Output Current (A)
2
Shutdown Current vs. Temperature
60
50
40
30
20
10
0
-50
-25
VIN = 12V, VOUT = 3.3V
0 25 50 75
Temperature (°C)
100 125
4.50
4.25
4.00
3.75
3.50
3.25
3.00
2.75
2.50
4
Current Limit vs. Input Voltage
VIN = 4.75V to 22V, VOUT = 3.3V
6 8 10 12 14 16 18 20 22 24
Input Voltage (V)
DS8267-02 March 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8267
Input capacitor must
be placed as close
to the IC as possible.
CIN
VIN
L1
SW
CB
BOOT
VIN
SW
D1 GND
COUT
VOUT
2
3
4
GND
CC
The feedback and
compensation components
must be connected as close
to the device as possible.
8 NC
7 EN
CP RC
6 COMP
R1
5 FB
VOUT
R2
GND
SW should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace.
Figure 4. PCB Layout Guide
Table 2. Suggested Inductors for Typical Application Circuit
Component Supplier
Series
Dimensions (mm)
TDK
SLF12555T 12.5 x 12.5 x 5.5
TAIYO YUDEN
NR8040
8x 8 x 4
TDK
SLF12565T 12.5 x 12.5 x 6.5
Table 3. Suggested Capacitors for CIN and COUT
Location Component Supplier
Part No.
CIN
MURATA
http://www.DataSheet4U.net/
GRM31CR61E106K
CIN TDK C3225X5R1E106K
CIN TAIYO YUDEN TMK316BJ106ML
COUT
MURATA
GRM32ER61E226M
COUT
TDK
C3225X5R0J226M
COUT
TAIYO YUDEN
EMK325BJ226MM
Capacitance (μF)
10
10
10
22
22
22
Case Size
1206
1206
1206
1210
1210
1210
Table 4. Suggested Diode
Component Supplier Series
DIODES
B330A
PANJIT
SK23
VRRM (V)
30
30
IOUT (A)
3
2
Package
SMA
DO-214AA
DS8267-02 March 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8267.PDF ] | |
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