RT8272 Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – 3A, 24V, 1.2MHz Step-Down Converter

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.
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.
Typical Application Circuit
Features
z Wide Operating Input Range : 4.75V to 24V
z Adjustable Output Voltage Range : 0.92V to 15V
z Output Current up to 3A
z 25μA Low Shutdown Current
z Power MOSFET : 0.1Ω
z High Efficiency up to 95%
z 1.2MHz 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 Distributive Power Systems
z Battery Charger
z DSL Modems
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
C_IN
10µF
2 _VIN
BOOT ¹
7 _EN
RT8272
SW ³
8 _SS
C_SS
0.1µF
4,
9 (Exposed Pad)
GND
FB ⁵
COMP ⁶
C_{BOOT L}
10nF 4.7µH
D1
B330
C_C R_C
2.2nF 39k
R1
25.8k
R2
10k
V_OUT
3.3V/3A
C_OUT
47µF
C_P
NC
DS8272-02 March 2011
www.richtek.com
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