RT8271 Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – 2A, 24V, 1.2MHz Step-Down Converter

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.
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.
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.
Features
z Wide Operating Input Range : 4.75V to 24V
z Adjustable Output Voltage Range : 0.92V to 16V
z Output Current up to 2A
z 22μA Low Shutdown Current
z Power MOSFET : 0.18Ω
z High Efficiency up to 92%
z 1.2MHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Programmable Soft-Start
z Thermal Shutdown Protection
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and Halogen Free
Applications
z Distributive Power Systems
z Battery Charger
z DSL Modems
z Pre-regulator for Linear Regulators
Pin Configurations
(TOP VIEW)
NC
BOOT
NC
VIN
SW
10
2
9
3 _GND 8
4
11 ⁷
5
6
SS
EN
COMP
FB
GND
MSOP-10 (Exposed Pad)
BOOT
VIN ²
SW
3
GND 4
8
SS
7
EN
6
COMP
5
FB
SOP-8
DS8271-02 March 2011
www.richtek.com
1