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PDF RT8250 Data sheet ( Hoja de datos )
| Número de pieza | RT8250 | |
| Descripción | 340kHz Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8250
3A, 23V, 340kHz Synchronous Step-Down Converter
General Description
The RT8250 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 RT8250'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 RT8250 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.
Ordering Information
RT8250
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.
Marking Information
RT8250
GSPYMDNN
RT8250GSP : Product Number
YMDNN : Date Code
Features
4.5V to 23V Input Voltage Range
1.5% High Accuracy Feedback Voltage
3A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.925V to 20V
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low-ESR Ceramic Output Capacitors
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
Thermally Enhanced SOP-8 (Exposed Pad) Package
RoHS Compliant and Halogen Free
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
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)
DS8250-05 March 2011
www.richtek.com
1
1 page  
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
80 VIN = 23V
VIN = 12V
70 VIN = 4.75V
60
50
40
30
20
10
VOUT = 3.3V
0
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Reference Voltage vs. Input Voltage
0.932
0.930
0.928
0.926
0.924
0.922
0.920
VOUT = 3.3V, IOUT = 0A
4 6 8 10 12 14 16 18 20 22 24
Input Voltage (V)
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)
DS8250-05 March 2011
RT8250
Output Voltage vs. Output Current
3.33
3.32
3.31
3.30
3.29
VIN = 4.75V
3.28
3.27
3.26
VIN = 12V
VIN = 23V
3.25
3.24
3.23
VOUT = 3.3V
0 0.5 1 1.5 2 2.5 3
Output Current (A)
Reference Voltage vs. Temperature
0.940
0.935
0.930
0.925
0.920
0.915
0.910
-50
-25
VIN = 6V, VOUT = 3.3V
0 25 50 75
Temperature (°C)
100 125
350
345
340
335
330
325
320
315
310
305
300
-50
Frequency vs. Temperature
VIN = 12V, VOUT = 3.3V, IOUT = 0A
-25 0 25 50 75 100 125
Temperature (°C)
www.richtek.com
5
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
RT8250
DS8250-05 March 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8250.PDF ] | |
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