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  Richtek Technology Electronic Components Datasheet  

RT8008 Datasheet

High Efficiency PWM Step-Down DC/DC Converter

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RT8008
1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC
Converter
General Description
Features
The RT8008 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
2.5V to 5.5V, the RT8008 is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or 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
RT8008 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 RT8008 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. RT8008 enter shutdown
mode and consumes less than 0.1μA 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 1.5MHz. 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)
FB/VOUT VIN
54
23
EN GND LX
SOT-23-5/TSOT-23-5
Marking Information
z 2.5V to 5.5V Input Range
z Adjustable Output From 0.6V to VIN
z 1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/
Adjustable Output Voltage
z 600mA Output Current, 1A Peak Current
z 95% Efficiency
z No Schottky Diode Required
z 1.5MHz Fixed Frequency PWM Operation
z Small SOT-23-5 and TSOT-23-5 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Cellular Telephones
z Personal Information Appliances
z Wireless and DSL Modems
z MP3 Players
z Portable Instruments
Ordering Information
RT8008(- )
Package Type
B : SOT-23-5
J5 : TSOT-23-5
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage
Default : Adjustable
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
Note :
Richtek 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.
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS8008-07 March 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8008 Datasheet

High Efficiency PWM Step-Down DC/DC Converter

No Preview Available !

RT8008
Typical Application Circuit
VIN
2.2V to 5.5V
CIN
4.7µF
4 VIN
L
2.2µH
LX 3
RT8008
1 EN
VOUT 5
GND
2
VOUT
COUT
10µF
Figure 1. Fixed Voltage Regulator
VOUT
=
VREF
x
⎜⎛1 +
R1
R2
⎟⎞
VIN
2.2V to 5.5V
L
4 VIN
2.2µH
LX 3
CIN C1
4.7µF
RT8008
R1
1 EN
FB 5
GND
2
IR2 R2
VOUT
COUT
10µF
with R2 = 300kΩ to 60kΩ so the IR2 = 2μA to 10μA,
and (R1 x C1) should be in the range between 3x10-6 and 6x10-6 for component selection.
Figure 2. Adjustable Voltage Regulator
Layout Guide
VIN
GND
CIN COUT
VIN 4 3 LX
VOUT
L
VIN
GND
CIN COUT
VIN 4 3 LX
VOUT
L
VOUT 5
2 GND
1 EN
GND
C1
FB
5
R1
VOUT
R2
2 GND
1 EN
GND
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 RT8008.
www.richtek.com
2
DS8008-07 March 2011


Part Number RT8008
Description High Efficiency PWM Step-Down DC/DC Converter
Maker Richtek
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RT8008 Datasheet PDF






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