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PDF RT8272 Data sheet ( Hoja de datos )
| Número de pieza | RT8272 | |
| Descripción | 1.2MHz Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8272
3A, 24V, 1.2MHz Step-Down Converter
General Description
The RT8272 is a high voltage buck converter that can
support the input voltage range from 4.75V to 24V and the
output current can be up to 3A. 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 RT8272 is available in a SOP-8 (Exposed
Pad) surface mount package.
Ordering Information
RT8272
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
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 24V
z Adjustable Output Voltage Range : 0.92V to 15V
z Output Current up to 3A
z 25μA Low Shutdown Current
z Power MOSFET : 0.1Ω
z High Efficiency up to 95%
z 1.2MHz 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
8
27
GND
3 96
45
SS
EN
COMP
FB
SOP-8 (Exposed Pad)
VIN
4.75V to 24V
Chip Enable
CIN
10µF
2 VIN
BOOT 1
7 EN
RT8272
SW 3
8 SS
CSS
0.1µF
4,
9 (Exposed Pad)
GND
FB 5
COMP 6
CBOOT L
10nF 4.7µH
D1
B330
CC RC
2.2nF 39k
R1
25.8k
R2
10k
VOUT
3.3V/3A
COUT
47µF
CP
NC
DS8272-02 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. Output Current
VIN = 12V
VIN = 24V
VOUT = 3.3V
0.5 1 1.5 2 2.5 3
Output Current (A)
RT8272
Reference Voltage vs. Input Voltage
0.925
0.924
0.923
0.922
0.921
0.920
0.919
0.918
0.917
0.916
0.915
4 6 8 10 12 14 16 18 20 22 24
Input Voltage (V)
Reference Voltage vs. Temperature
0.94
3.350
Output Voltage vs. Output Current
0.935
0.93
0.925
3.345
3.340
3.335
3.330
0.92 3.325
0.915
http://www.DataSheet4U.net/
3.320
3.315
0.91
3.310
0.905
0.9
VIN = 12V
3.305
3.300
VIN = 12V
-50 -25 0
25 50 75 100 125
0 0.5 1 1.5 2 2.5 3
Temperature (°C)
Output Current (A)
Frequency vs. Input Voltage
1.23
Frequency vs. Temperature
1.30
1.22 1.25
1.21 1.20
1.20 1.15
1.19 1.10
1.18
1.17
VOUT = 3.3V, IOUT = 0.3A
4 6 8 10 12 14 16 18 20 22 24
Input Voltage (V)
1.05
1.00
-50
-25
VIN = 12V, VOUT = 3.3V, IOUT = 0.3A
0 25 50 75 100 125
Temperature (°C)
DS8272-02 March 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8272
GND
VIN SW
CB
Input capacitor must be placed
as close to the IC as possible.
COUT
The output capacitor must be
placed near the RT8272. VOUT
CIN
D1
L
BOOT
VIN
SW
GND
SW should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace.
CSS
8
2 GND 7
36
45
The parallel distance between
COMP and FB traces must be
SS as short as possible.
EN CC
COMP
FB CP
RC
GND
VOUT
The resistor divider must be connected
as close to the device as possible.
Figure 4. PCB Layout Guide
Table 2. Suggested Inductors for Typical Application Circuit
Component Supplier
S er ie s
Inductance (µH) DCR (mΩ)
TDK
RLF7030
4.7
31
TAIYO YUDEN
NR 8040
4.7
18
GOTERND
GSSR2
4.7
18
Current Rating (A) Dimensions (mm)
3.5 7.3 x 6.8 x 3.2
4.7 8 x 8 x 4
5.7 10 x 10 x 3.8
Table 3. Suggested Capacitors for CIN and COUT
Component Supplier
Part No.
MURATA
GRM31CR61E106K
TDK C3225X5R1E106K
TAIYO YUDEN
TMK316BJ106ML
MURATA
GRM31CR60J476M
TDK C3225X5R0J476M
TAIYO YUDEN
EMK325BJ476MM
Capacitance (µF)
http://www.DataSheet4U.net/
10
10
10
47
47
47
Case Size
1206
1206
1206
1206
1210
1210
Table 4. Suggested Diode
Component Supplier Series
DIODES
B330A
DIODES
B340
PANJIT
SK33
PANJIT
SK34
VRRM (V)
30
40
30
40
IOUT (A)
3
3
3
3
Package
DO-214AC
DO-214AB
DO-214AB
DO-214AB
DS8272-02 March 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8272.PDF ] | |
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