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.
Features
Wide Operating Input Range : 4.75V to 24V
Adjustable Output Voltage Range : 0.92V to 15V
Output Current up to 3A
25μA Low Shutdown Current
μ
Power MOSFET : 0.1Ω
Ω
High Efficiency up to 95%
1.2MHz Fixed Switching Frequency
Stable with Low ESR Output Ceramic Capacitors
Thermal Shutdown Protection
Cycle-By-Cycle Over Current Protection
RoHS Compliant and Halogen Free
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.
Applications
Distributive Power Systems
Battery Charger
DSL Modems
Pre-regulator for Linear Regulators
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
2
3
4
8
SS
EN
COMP
FB
GND
9
7
6
5
SOP-8 (Exposed Pad)
Typical Application Circuit
V
IN
4.75V to 24V
Chip Enable
2
C
IN
10µF
VIN
BOOT
RT8272
7 EN
8 SS
4,
9 (Exposed Pad)
GND
SW 3
1
C
BOOT
L
10nF 4.7µH
D1
B330
C
C
2.2nF
R
C
39k
R1
25.8k
R2
10k
V
OUT
3.3V/3A
C
OUT
47µF
C
SS
0.1µF
FB 5
COMP
6
C
P
NC
DS8272-02 March 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
