RT9270 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – High Performance, Low Noise Boost Converter

Preliminary
RT9270
High Performance, Low Noise Boost Converter
General Description
The RT9270 is a high performance, low noise, fixed
frequency step up DC-DC Converter. The RT9270
converters input voltage ranging 2.3V to 5.5V into output
voltage up to 14V. Current mode control with external
compensation network makes it easy to stabilize the
system and keep maximum flexibility. Programmable soft
start function minimizes impact on the input power system.
Internal power MOSFET with very low R_DS(ON) provides
high efficiency. The RT9270 automatically transits from
PWM to PSM (Pulse Skipping Mode) during light load
condition further increasing efficiency. 670kHz and
1.3MHz operation frequency options provide flexibiltity of
minimum output filter size, maximum efficiency and low
BOM cost.
The RT9270 also provides comprehensive protection
functions such as UVLO, OCP, OTP, OVP and short circuit
protection.
Ordering Information
RT9270
Package Type
F : MSOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Features
z 90% Efficiency
z V_IN Operating Range: 2.3V to 5.5V
z 1.9A, 0.25Ω, 16V Internal Power MOSFET
z 670kHz and 1.3MHz Operation Frequency
z External Compensation Network
z Programmable Soft Start Function
z Small MSOP8 Package
z Short Circuit Protection , Thermal Shutdown, OVP
are included
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z TFT LCD panel
z OLEDDisplay
z PCMCIA Cards
z Portable Device
Pin Configurations
(TOP VIEW)
COMP
FB
2
EN
3
GND
4
8
SS
7
FREQ
6
VIN
5
LX
MSOP-8
Note :
RichTek Pb-free and Green 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.
`100%matte tin (Sn) plating.
Typical Application Circuit
V_IN
C1
L1
D1
C2
5 _LX
GND ⁴
6 _VIN
EN ³
7 _{FREQ FB} 2
8 _{SS COMP} 1
R3
C5
RT9270
C4
C3
Chip Enable
V_OUT
R1
R2
Figure 1
DS9270-09 March 2007
www.richtek.com
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