RT8258GE Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – Wide Operating Input Voltage Range : 4.5V to 24V

RT8258
1.2A, 24V, 700kHz Step-Down Converter
General Description
The RT8258 is a high voltage buck converter that can support
the input voltage range from 4.5V to 24V and the output
current can be up to 1.2A. Current Mode operation provides
fast transient response and eases loop stabilization.
The chip also provides protection functions such as cycle-
by-cycle current limiting and thermal shutdown protection.
The RT8258 is available in a SOT-23-6 and TSOT-23-6
packages.
Ordering Information
RT8258
Package Type
E : SOT-23-6
J6 : TSOT-23-6
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Features
z Wide Operating Input Voltage Range : 4.5V to 24V
z Adjustable Output Voltage Range : 0.8V to 15V
z 1.2A Output Current
z 0.3Ω Internal Power MOSFET Switch
z High Efficiency up to 92%
z 700kHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Thermal Shutdown
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and Halogen Free
Applications
z Distributed Power Systems
z Battery Charger
z Pre-Regulator for Linear Regulators
z WLEDDrivers
Pin Configurations
(TOP VIEW)
PHASE VIN EN
6
5
4
2
3
BOOT GND FB
SOT-23-6/TSOT-23-6
Typical Application Circuit
V_IN
4.5V to 24V
C_IN
10µF
5 _{VIN BOOT} 1
RT8258
PHASE ⁶
Chip Enable
4 _EN
FB ³
GND
2
C_{BOOT L}
10nF 10µH
D1
B230A
V_OUT
3.3V
R1
100k
R2
32.4k
C_OUT
22µF
DS8258-02 March 2011
www.richtek.com
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