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  Richtek Technology Electronic Components Datasheet  

RT8251 Datasheet

570kHz Step-Down Converter

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®
RT8251
5A, 24V, 570kHz Step-Down Converter
General Description
The RT8251 is a monolithic step-down switch mode
converter with a built-in internal power MOSFET. It achieves
5A continuous output current over a wide input supply
range with excellent load and line regulation. Current mode
operation provides fast transient response and eases loop
stabilization.
The RT8251 provides protection functions such as
cycle-by-cycle current limiting and thermal shutdown. In
shutdown mode, the regulator draws 25μA of supply
current. Programmable soft-start minimizes the inrush
supply current and the output overshoot at initial startup.
The RT8251 requires a minimum number of external
components. The RT8251 is available in WQFN-16L 3x3
and SOP-8 (Exposed Pad) packages.
Pin Configurations
(TOP VIEW)
Features
z Wide Operating Input Voltage Range : 4.75V to 24V
z Adjustable Output Voltage Range : 0.8V to 15V
z Output Current up to 5A
z 25μA Low Shutdown Current
z Internal Power MOSFET : 70mΩ
z High Efficiency up to 95%
z 570kHz 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 Distributed Power Systems
z Battery Charger
z DSL Modems
z Pre-regulator for Linear Regulators
16 15 14 13
VIN
VIN
VIN
GND
1
2
3
4
GND
17
12 SW
11 SW
10 SW
9 BOOT
5678
WQFN-16L 3x3
BOOT
VIN
SW
GND
8
27
GND
36
9
45
SS
EN
COMP
FB
SOP-8 (Exposed Pad)
Ordering Information
RT8251
Package Type
QW : WQFN-16L 3x3 (W-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.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8251-04 February 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8251 Datasheet

570kHz Step-Down Converter

No Preview Available !

RT8251
Marking Information
RT8251GQW
GE= : Product Code
GE=YM
DNN
YMDNN : Date Code
RT8251GSP
RT8251
GSPYMDNN
RT8251GSP : Product Number
YMDNN : Date Code
Typical Application Circuit
VIN
4.75V to 24V
Chip Enable
1, 2, 3,
15, 16 VIN
BOOT 9
CIN
10µF x 2
7
RT8251
SW
10 to 14
EN
CSS
10nF
8 SS
4,
Exposed Pad (17)
GND
FB 5
COMP 6
CC
2.2nF
CBOOT L
100nF 4.7µH
D
B540C
RC
22k
R1
30.9k
R2
10k
VOUT
3.3V/5A
COUT
22µF x 2
CP
(Open)
Figure 1. Typical Application Circuit for WQFN-16L 3x3
VIN
4.75V to 24V
Chip Enable
2 VIN
CIN
10µF x 2
7 EN
BOOT 1
RT8251
SW 3
CSS
10nF
8 SS
4,
Exposed Pad(9)
GND
FB 5
COMP 6
CBOOT
100nF L
D 4.7µH
B540C
CC
2.2nF
RC
22k
R1
30.9k
R2
10k
VOUT
3.3V/5A
COUT
22µF x 2
CP
NC
Figure 2. Typical Application Circuit for SOP-8 (Exposed Pad)
VOUT (V)
15
10
8
5
3.3
2.5
1.8
1.2
Table 1. Recommended Component Selection
R1 (kΩ)
182
R2 (kΩ)
10
RC (kΩ)
51
CC (nF)
1
L1 (μH)
22
115 10 43 1.2 10
91 10 39 1.5 10
52.3 10 30 1.5 6.8
30.9 10 22 2.2 4.7
21.5 10 16 2.2 4.7
12.4 10 13 2.2 2.2
4.99 10 13 2.2 2.2
COUT (μF)
44
44
44
44
44
44
44
44
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8251-04 February 2013


Part Number RT8251
Description 570kHz Step-Down Converter
Maker Richtek
PDF Download

RT8251 Datasheet PDF






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