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PDF RT8250N Data sheet ( Hoja de datos )
| Número de pieza | RT8250N | |
| Descripción | 340kHz Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8250N
3A, 23V, 340kHz Synchronous Step-Down Converter
General Description
The RT8250N is a high-efficiency synchronous step-down
DC/DC converter that can deliver up to 3A output current
from 4.75V to 23V input supply. The RT8250N'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 RT8250N
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.
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
Features
z 4.75V to 23V Input Voltage Range
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
RT8250N
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Green 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.
SOP-8 (Exposed Pad)
Typical Application Circuit
VIN
4.75V to 23V
REN
100k
2 VIN
CIN
10µFx2
7 EN
BOOT 1
RT8250N
SW 3
8 SS
CSS
0.1uF
4,
Exposed Pad(9)
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
CP
NC
DS8250N-01 November 2009
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)
DS8250N-01 November 2009
RT8250N
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.
M URATA
GRM 31CR6 1E1 06K
TDK
C 3225 X5R1 E10 6K
TAIYO YUDEN
TMK 316 BJ 106M L
M URATA
GRM 31CR6 0J4 76M
TDK
C 3225 X5R0 J4 76M
TAIYO YUDEN
E MK3 25B J4 76M M
M URATA
G RM 32E R71C2 26M
TDK
C3 225X 5R1C 226M
Capacitance (μF)
10
10
10
47
47
47
22
22
Case Size
120 6
120 6
120 6
120 6
121 0
121 0
121 0
121 0
RT8250N
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing)
8F, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)89191466 Fax: (8862)89191465
Email: [email protected]
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
DS8250N-01 November 2009
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8250N.PDF ] | |
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