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PDF RT8290 Data sheet ( Hoja de datos )
| Número de pieza | RT8290 | |
| Descripción | 340kHz Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8290
3A, 23V, 340kHz Synchronous Step-Down Converter
General Description
The RT8290 is a high efficiency synchronous step-down
DC/DC converter that can deliver up to 3A output current
from 4.5V to 23V input supply. The RT8290's current mode
architecture and external compensation allow the transient
response to be optimized over a wide range of loads and
output capacitors. Cycle-by-cycle current limit provides
protection against shorted outputs and soft-start eliminates
input current surge during start-up. The RT8290 also
provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown
mode provides output disconnection, enabling easy power
management in battery-powered systems. The RT8290
is awailable in an SOP-8 (Exposed Pad) package.
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation of High-Performance DSPs,
FPGAs and ASICs.
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
8
27
GND
36
9
45
SS
EN
COMP
FB
SOP-8 (Exposed Pad)
Features
z 4.5V to 23V Input Voltage Range
z 1.5% High Accuracy Feedback Voltage
z 3A Output Current
z Integrated N-MOSFET Switches
z Current Mode Control
z Fixed Frequency Operation : 340kHz
z Output Adjustable from 0.925V to 20V
z Up to 95% Efficiency
z Programmable Soft-Start
z Stable with Low-ESR Ceramic Output Capacitors
z Cycle-by-Cycle Over Current Protection
z Input Under Voltage Lockout
z Output Under Voltage Protection
z Thermal Shutdown Protection
z Thermally Enhanced SOP-8 (Exposed Pad) Package
z RoHS Compliant and Halogen Free
Ordering Information
RT8290
http://www.DataSheet4U.net/
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Typical Application Circuit
VIN
4.5V to 23V
REN
100k
2 VIN
CIN
10µFx2
7 EN
BOOT 1
RT8290
SW 3
8 SS
CSS
0.1µF
9
(Exposed
4,
Pad)
GND
FB 5
COMP 6
CBOOT L1
10nF 10µH
CC
3.9nF
RC
6.8k
R1
26.1k
R2
10k
VOUT
3.3V/3A
COUT
22µFx2
DS8290-02 March 2011
CP
NC
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 = 4.5V
VIN = 12V
VIN = 23V
VOUT = 3.3V
0.5 1 1.5 2 2.5
Output Current (A)
3
RT8290
0.932
Reference Voltage vs. Input Voltage
0.930
0.928
0.926
0.924
0.922
0.920
4 6 8 10 12 14 16 18 20 22 24
Input Voltage (V)
0.940
Reference Voltage vs. Temperature
Output Voltage vs. Output Current
3.320
0.935
0.930
3.318
3.315
3.313
0.925
0.920
0.915
0.910
-50
-25
0 25 50 75
Temperature (°C)
100
http://www.DataSheet4U.net/
3.310
3.308
3.305
3.303
3.300
125 0
VIN = 4.5V
VIN = 12V
VIN = 23V
VOUT = 3.3V
0.5 1 1.5 2 2.5
Output Current (A)
3
350
345
340
335
330
325
320
315
310
305
300
4
Frequency vs. Input Voltage
VOUT = 3.3V, IOUT = 0A
6 8 10 12 14 16 18 20 22 24
Input Voltage (V)
350
345
340
335
330
325
320
315
310
305
300
-50
Frequency vs. Temperature
VIN = 4.5V
VIN = 12V
VIN = 23V
VOUT = 3.3V, IOUT = 0A
-25 0
25 50 75 100 125
Temperature (°C)
DS8290-02 March 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Table 2. Suggested Inductors for Typical Application Circuit
Component Supplier Series Dimensions (mm)
TDK
VLF10045 10 x 9.7 x 4.5
TAIYO YUDEN
NR8040
8x8x4
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
MURATA
GRM32ER71C226M
TDK
C3225X5R1C226M
Capacitance (μF)
10
10
10
47
47
47
22
22
Case Size
1206
1206
1206
1206
1210
1210
1210
1210
RT8290
http://www.DataSheet4U.net/
DS8290-02 March 2011
www.richtek.com
11
datasheet pdf - http://www.DataSh
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8290.PDF ] | |
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