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.
Features
Wide Operating Input Voltage Range : 4.5V to 24V
Adjustable Output Voltage Range : 0.8V to 15V
1.2A Output Current
0.3Ω Internal Power MOSFET Switch
Ω
High Efficiency up to 92%
700kHz Fixed Switching Frequency
Stable with Low ESR Output Ceramic Capacitors
Thermal Shutdown
Cycle-By-Cycle Over Current Protection
RoHS Compliant and Halogen Free
Ordering Information
RT8258
Package Type
E : SOT-23-6
J6 : TSOT-23-6
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.
深
圳
市
富
�½�
Applications
维
电
子
Distributed Power Systems
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.
5
7
0
深
-
5
3
2
1
8
5
5
5
2
Battery Charger
Pre-Regulator for Linear Regulators
WLED Drivers
Pin Configurations
8
/
1
2
3
2
0
5
4
4
Typical Application Circuit
圳
V
IN
4.5V to 24V
C
IN
10µF
5 VIN
BOOT
1
C
BOOT
L
10nF 10µH
D1
B230A
V
OUT
3.3V
市
鼎
�½
诚
RT8258
际
大
厦
室
5
0
8
(TOP VIEW)
PHASE VIN EN
6
5
2
4
3
BOOT GND FB
SOT-23-6/TSOT-23-6
PHASE 6
4 EN
GND
2
FB 3
Chip Enable
R1
100k
R2
32.4k
C
OUT
22µF
DS8258-02 March 2011
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
