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.
Features
90% Efficiency
V
IN
Operating Range: 2.3V to 5.5V
1.9A, 0.25Ω, 16V Internal Power MOSFET
Ω
670kHz and 1.3MHz Operation Frequency
External Compensation Network
Programmable Soft Start Function
Small MSOP8 Package
Short Circuit Protection , Thermal Shutdown, OVP
are included
RoHS Compliant and 100% Lead (Pb)-Free
Applications
TFT LCD panel
OLED Display
PCMCIA Cards
Portable Device
Pin Configurations
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)
COMP
FB
EN
GND
8
2
3
4
7
6
5
(TOP VIEW)
SS
FREQ
VIN
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.
V
IN
C1
+
Typical Application Circuit
Chip Enable
L1
D1
V
OUT
C2
R1
+
5 LX
6 VIN
GND
4
3
2
1
R3
C4
EN
7 FREQ
FB
8 SS
COMP
C5
RT9270
C3
R2
Figure 1
DS9270-09 March 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
