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  Richtek Technology Electronic Components Datasheet  

RT8009 Datasheet

High Efficiency PWM Step-Down DC/DC Converter

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RT8009
1.25MHz, 600mA, High Efficiency PWM Step-Down DC/DC
Converter
General Description
Features
The RT8009 is a high-efficiency pulse-width-modulated
(PWM) step-down DC-DC converter. Capable of delivering
600mA output current over a wide input voltage range from
2.5 to 5.5V, the RT8009 is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
www.DataShbeaettt4eUry.coomr from other power sources within the range such
as cellular phones, PDAs and handy-terminals.
Internal synchronous rectifier with low RDS(ON) dramatically
reduces conduction loss at PWM mode. No external
Schottky diode is required in practical application. The
RT8009 automatically turns off the synchronous rectifier
while the inductor current is low and enters discontinuous
PWM mode. This can increase efficiency at light load
condition.
The RT8009 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. RT8009 enter shutdown
mode and consumes less than 0.1uA when EN pin is pulled
low.
The switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operation
frequency of 1.25MHz. This along with small SOT-23-5
and TSOT-23-5 package provides small PCB area
application. Other features include soft start, lower internal
reference voltage with 2% accuracy, over temperature
protection, and over current protection.
Pin Configurations
(TOP VIEW)
VIN 1
GND 2
5 LX
EN 3 4 FB/VOUT
SOT-23-5/TSOT-23-5
+2.5V to +5.5V Input Range
Adjustable Output From 0.5V to VIN
1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/
Adjustable Output Voltage
600mA Output Current
95% Efficiency
No Schottky Diode Required
1.25MHz Fixed-Frequency PWM Operation
Small SOT-23-5 and TSOT-23-5 Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Ordering Information
RT8009(- )
Package Type
B : SOT-23-5
J5 : TSOT-23-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
Default : Adjustable
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
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.
DS8009-03 March 2007
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8009 Datasheet

High Efficiency PWM Step-Down DC/DC Converter

No Preview Available !

RT8009
Typical Application Circuit
www.DataSheet4U.com
VIN
2.5V to 5.5V
CIN
4.7uF
1 VIN
L
4.7uH
LX 5
RT8009
3 EN
VOUT 4
GND
2
Figure 1. Fixed Voltage Regulator
VOUT
COUT
10uF
VIN
2.5V to 5.5V
L
1 VIN
4.7uH
LX 5
CIN
4.7uF
RT8009
C1
R1
3 EN
FB 4
GND
2
R2
VOUT
COUT
10uF
VOUT
=
VREF
x
⎜⎛1+
R1
R2
⎟⎞
with R1+ R2 1MΩ and
VREF(Typ.) = 0.5V
Figure 2. Adjustable Voltage Regulator
Layout Guide
VIN
L VOUT
VIN
L VOUT
VIN 1
CIN
GND 2
EN 3
5 LX
COUT
GND
4 VOUT
VIN 1
CIN
GND 2
EN 3
5 LX
COUT
GND
R2
4 FB
R1 VOUT
Figure 3
Layout note:
1. The distance that CIN connects to VIN is as close as possible (Under 2mm).
2. COUT should be placed near RT8009.
C1
www.richtek.com
2
DS8009-03 March 2007


Part Number RT8009
Description High Efficiency PWM Step-Down DC/DC Converter
Maker Richtek
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RT8009 Datasheet PDF






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