Preliminary
RT9277A/B
High Performance, Low Noise Boost Converter
General Description
The RT9277A/B is a high performance, low noise, fixed
frequency step
up DC-DC Converter. The RT9277A/B
converters input voltage ranging 2.5V to 5.5V into output
voltage up to 16V. Current mode control with external
compensation network makes it easy to stabilize the
system and keep maximum flexibility. Soft start function
minimizes impact on the input power system. Internal power
MOSFET with very low R
DS(ON)
provides high efficiency.
The RT9277A/B automatically transits from PWM to PSM
(Pulse Skipping Mode) during light load condition further
increasing efficiency. 640kHz and 1.2MHz operation
frequency options provide flexibiltity of minimum output
inductor size, maximum efficiency and low BOM cost.
The RT9277A/B also provides comprehensive protection
functions such as UVLO, OCP and OTP.
Features
90% Efficiency
V
IN
Operating Range : 2.5V to 5.5V
1.6A, 0.2Ω, 16V Internal Power MOSFET
Ω
640kHz and 1.2MHz Operation Frequency
External Compensation Network
Internal/External Programmable Soft Start Function
Small MSOP8 Package
OCP and OTP Function are Included
RoHS Compliant and 100% Lead (Pb)-Free
Applications
TFT LCD panel
OLED Display
PCMCIA Cards
Portable Device
Ordering Information
RT9277A/B
Package Type
F : MSOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Soft Start Function
A : Internal
B : External Programmable
Pin Configurations
(TOP VIEW)
COMP
FB
EN
GND
1
2
3
4
8
7
6
5
NC
FREQ
VIN
LX
RT9277A
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.
COMP
FB
EN
GND
1
2
3
4
8
7
6
5
SS
FREQ
VIN
LX
RT9277B
MSOP-8
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
DS9277A/B-02 March 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
