RT8271
2A, 24V, 1.2MHz Step-Down Converter
General Description
The RT8271 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 2A. Current Mode operation
provides fast transient response and eases loop
stabilization. The RT8271 also provides adjustable soft-
start to be a flexible solution for customers.
The chip provides protection functions such as cycle-by-
cycle current limiting and thermal shutdown protection.
In shutdown mode, the regulator draws 22μA of supply
current. The RT8271 is available in the SOP-8 and
MSOP-10 (Exposed Pad) surface mount package.
Features
Wide Operating Input Range : 4.75V to 24V
Adjustable Output Voltage Range : 0.92V to 16V
Output Current up to 2A
22μA Low Shutdown Current
μ
Power MOSFET : 0.18Ω
Ω
High Efficiency up to 92%
1.2MHz Fixed Switching Frequency
Stable with Low ESR Output Ceramic Capacitors
Programmable Soft-Start
Thermal Shutdown Protection
Cycle-By-Cycle Over Current Protection
RoHS Compliant and Halogen Free
Ordering Information
RT8271
Package Type
S : SOP-8
FP : MSOP-10 (Exposed Pad)
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)
NC
BOOT
NC
VIN
SW
10
2
3
4
5
9
GND
8
11 7
6
SS
EN
COMP
FB
GND
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
MSOP-10 (Exposed Pad)
BOOT
VIN
SW
GND
2
3
4
8
7
6
5
SS
EN
COMP
FB
SOP-8
DS8271-02 March 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
