Preliminary
RT9275
Tiny Package, High Efficiency, Step-Up DC/DC Converter
General Description
The RT9275 is a compact, high efficiency, and low voltage
step-up DC/DC converter with an Adaptive Current Mode
PWM control loop, includes an error amplifier, ramp
generator, comparator, switch pass element and driver in
which providing a stable and high efficient operation over a
wide range of load currents.
The low start-up input voltage below 1V makes RT9275
suitable for 1 to 4 battery cells applications. Both internal
2.5A switch and driver for driving external power devices
(NMOS or NPN) are provided. It is incorporating with soft-
start function, Under Voltage protection function.
RT9275 is available in
SOT-23-6
package.
Features
1V Low Start-up Input Voltage at 1mA Load
Zero Shutdown Mode Supply Current
90% Efficiency
400kHz Switching Frequency
Providing Flexibility for Using Internal and External
Power Switches
Build Soft-Start function internally
Under-Voltage Protection
Small
SOT-23-6
Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
PDA
DSC
LCD Panel
RF-Tags
MP3
Portable Instrument
Wireless Equipment
Ordering Information
RT9275
Package Type
E : SOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Pin Configurations
(TOP VIEW)
FB
6
1
EN
VDD
5
2
LX
4
3
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.
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.
EXT GND
SOT-23-6
Note
: There is no pin1 indicator on top mark for
SOT-23-6
type, and pin 1 will be lower left pin when reading top mark
from left to right.
DS9275-06 March 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
