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PDF RT8009 Data sheet ( Hoja de datos )
| Número de pieza | RT8009 | |
| Descripción | High Efficiency PWM Step-Down DC/DC Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8009 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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
1 page  
RT8009
Parameter
Symbol
Test Conditions
Output Voltage
Accuracy
FB Input Current
A dj ust abl e
ΔVOUT
IFB
VIN = VOUT + ΔV to 5.5V
0A < IOUT < 600mA
VFB = VIN
(Note 5)
RDS(ON) of P-Channel MOSFET RDS(ON)_P IOUT = 200mA
VIN = 3.6V
VIN = 2.5V
RDS(ON) of N-Channel MOSFET RDS(ON)_N IOUT = 200mA
VIN = 3.6V
VIN = 2.5V
www.DataShePe-tC4Uh.aconmnel Current Limit
ILIM_P
VIN = 2.5V to 5.5 V
EN High-Level Input Voltage
VEN_H
VIN = 2.5V to 5.5V
EN Low-Level Input Voltage
VEN_L
VIN = 2.5V to 5.5V
Undervoltage Lock Out threshold
Hy ste re si s
Oscillator Frequency
fOSC
Thermal Shutdown Temperature TSD
Min. On Time
VIN = 3.6V, IOUT = 100mA
Max. Duty Cycle
LX Leakage Current
VIN = 3.6V, VLX = 0V or VLX = 3.6V
M in
−3
−5 0
--
--
--
--
1
1.5
--
--
--
0.8
--
--
10 0
-1
Typ
--
--
0 .3
0 .4
0. 25
0. 35
--
--
--
1 .8
0 .1
1. 25
160
50
--
--
Max Units
+3 %
50 nA
0.65
Ω
0.80
0.55
Ω
0.65
1.8 A
-- V
0.4 V
-- V
-- V
1.85 MHz
-- °C
-- ns
-- %
1 μA
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 5. ΔV = IOUT x RDS(ON)_P
DS8009-03 March 2007
www.richtek.com
5
5 Page 
` Connect feedback network behind the output capacitors.
Keep the loop area small. Place the feedback
components near the RT8009.
` Connect all analog grounds to a command node and
then connect the command node to the power ground
behind the output capacitors.
` An example of 2-layer PCB layout is shown in Figure 7
and Figure 8 for reference.
www.DataShVeIeNt4U.com
1
RT8009
VIN LX
5
L1
4.7uH
R3
3 EN
FB 4
C3
4.7uF
GND
2
C1
C2
VOUT
R1
C4
R2 10uF
RT8009
Figure 7. Top Layer
Figure 6. EVB Schematic
Figure 8. Bottom Layer
Recommended component selection for Typical Application
Table 1. Inductors
Component Supplier Series Inductance (uH) DCR (mΩ) Current Rating (mA) Dimensions (mm)
TAIYO YUDEN
NR 3015
2.2
60
148 0
3x3x1.5
TAIYO YUDEN
NR 3015
4.7
1 20
102 0
3x3x1.5
Sumida
CDRH2 D14
2.2
75
150 0
4.5 x3 .2x 1.55
Sumida
CDRH2 D14
4.7
1 35
100 0
4.5 x3 .2x 1.55
GOTREND
GT SD32
2.2
58
150 0
3.8 5x 3.85 x1. 8
GOTREND
GT SD32
4.7
1 46
1100
3.8 5x 3.85 x1. 8
Com ponent Supplier
TDK
TDK
M URATA
M URATA
M URATA
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Table 2. Capacitors for CIN and COUT
Part No.
Capacitance (uF)
C160 8J B0J 47 5M
4. 7
C201 2J B0J 10 6M
10
GRM1 88R6 0J4 75K E 19
4. 7
GRM2 19R6 0J 106 ME1 9
10
GRM2 19R6 0J1 06K E 19
10
J MK 107 BJ 47 5RA
4. 7
JM K1 07B J1 06M A
10
J MK 212B J 106 RD
10
Case Size
060 3
080 5
060 3
080 5
080 5
060 3
060 3
080 5
DS8009-03 March 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT8009.PDF ] | |
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