RT8265 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – The RT8265 is an asynchronous high voltage buck converter

RT8265
3A, 24V, 1MHz Asynchronous Step-Down Converter
General Description
The RT8265 is an asynchronous 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. The IC provides a
Feed-forward Voltage Mode operation to achieve the goal
of fast line transient response. The RT8265 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 25μA of supply current.
The RT8265 is available in a SOP-8 (Exposed Pad) surface
mount package.
Ordering Information
RT8265
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
P : Pb Free
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.
Typical Application Circuit
Features
z Wide Operating Input Range : 4.75V to 24V
z Adjustable Output Voltage Range : 0.8V to 15V
z Output Current up to 3A
z 25μA Low Shutdown Current
z Power MOSFET : 110mΩ
z High Efficiency up to 93%
z 1MHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Programmable Soft-Start
z Thermal Shutdown
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Distributed Power Systems
z Battery Charger
z Pre-Regulator for Linear Regulators
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
8
2
7
GND
3
96
4
5
SS
EN
COMP
FB
SOP-8 (Exposed Pad)
V_IN
4.75V to 24V
Chip Enable
2 _VIN
C1
10µF/25V
7 _EN
BOOT ¹
RT8265
SW ³
8 _SS
C_S
0.1µF
4,
9 (Exposed Pad)
GND
FB ⁵
COMP ⁶
CB
L1
10nF ^4.7µH
D1
B330A
C_C
0.56nF
R_C
82k
R1
49.9k
R2
16k
V_OUT
3.3V
C2
47µF
6.3V
C_P
NC
DS8265-02 March 2011
www.richtek.com
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