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  Richtek Technology Electronic Components Datasheet  

RT9275 Datasheet

Step-up DC/DC Converter

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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.
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)
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.
Features
z 1V Low Start-up Input Voltage at 1mA Load
z Zero Shutdown Mode Supply Current
z 90% Efficiency
z 400kHz Switching Frequency
z Providing Flexibility for Using Internal and External
Power Switches
z Build Soft-Start function internally
z Under-Voltage Protection
z Small SOT-23-6 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z PDA
z DSC
z LCD Panel
z RF-Tags
z MP3
z Portable Instrument
z Wireless Equipment
Pin Configurations
(TOP VIEW)
FB VDD LX
65 4
123
EN 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 Technology Electronic Components Datasheet  

RT9275 Datasheet

Step-up DC/DC Converter

No Preview Available !

RT9275
Typical Application Circuit
Preliminary
L1
4.7 uH
VIN C3
10uF
VDD
EN RT9275 LX
EXT GND FB
D1
FS1J2E
C2
1uF
C4
R1
6.8pF/ 2M/3M
3.3pF
R2
980k/1M
VOUT
3.3V/5V
C1
10uF/20uF
Functional Pin Description
Pin No.
1
2
3
4
5
6
Pin Name
EN
EXT
GND
LX
VDD
FB
Pin Function
Chip Enable (Active High)
Output pin for driving external NMOS
Ground
Pin for switching
Input positive power pin of RT9275
Feedback input pin. Internal reference
voltage for the error amplifier is 1.25V.
Function Block Diagram
VDD
FB - Loop Control
Bandgap/
+
Circuit
Soft Start VREF
Under Voltage
Protection
VDD
Over Voltage
Protection
EN Over Temp.
Detector
Function
Suspend
EXT
LX
GND
www.richtek.com
2
DS9275-06 March 2007


Part Number RT9275
Description Step-up DC/DC Converter
Maker Richtek
PDF Download

RT9275 Datasheet PDF






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