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PDF RT8024 Data sheet ( Hoja de datos )
| Número de pieza | RT8024 | |
| Descripción | High Efficiency PWM Step-Down DC/DC Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8024
1.5MHz, 400mA, High Efficiency PWM Step-Down
DC/DC Converter
General Description
Features
The RT8024 is a high-efficiency pulse-width-modulated
(PWM) step-down DC/DC converter. Capable of delivering
400mA output current over a wide input voltage range from
2.5V to 5.5V, the RT8024 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
RT8024 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 RT8024 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. RT8024 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
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 400mA 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 Halogen Free
Applications
z Cellular Telephones
z Personal Information Appliances
z Wireless and DSL Modems
z MP3 Players
z Portable Instruments
Ordering Information
RT8024(-
)
Package Type
B : SOT-23-5
J5 : TSOT-23-5
Lead Plating System
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS8024-02 March 2011
www.richtek.com
1
1 page  
RT8024
Parameter
Symbol
Test Conditions
FB Input Current
PMOSFET RON
NMOSFET RON
P-Channel Current Limit
EN High-Level Input Voltage
EN Low-Level Input Voltage
Undervoltage Lock Out threshold
IFB VFB = VIN
PRDS(ON) IOUT = 200mA
NRDS(ON) IOUT = 200mA
IP(LM)
VENH
VENL
VIN = 2.5V to 5.5 V
VIN = 2.5V to 5.5V
VIN = 2.5V to 5.5V
VIN = 3.6V
VIN = 2.5V
VIN = 3.6V
VIN = 2.5V
Hysteresis
Oscillator Frequency
Thermal Shutdown Temperature
Min. On Time
fOSC
TSD
VIN = 3.6V, IOUT = 100mA
Max. Duty Cycle
LX Leakage Current
VIN = 3.6V, VLX = 0V or VLX = 3.6V
Min Typ Max Unit
−50 --
50 nA
-- 0.3 --
-- 0.4 --
Ω
-- 0.25 --
-- 0.35 --
Ω
1 -- 1.8 A
1.5 -- -- V
-- -- 0.4 V
-- 1.8 --
V
-- 0.1 --
V
1.2 1.5 1.8 MHz
-- 160 -- °C
-- 50 -- ns
100 -- -- %
−1 --
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. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of
JEDEC 51-3 thermal measurement standard. Pin 2 of SOT-23-5/TSOT-23-5 packages is the case position for θJC
measurement.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS8024-02 March 2011
www.richtek.com
5
5 Page 
} Connect feedback network behind the output capacitors.
Keep the loop area small. Place the feedback
components near the RT8024.
} Connect all analog grounds to a command node and
then connect the command node to the power ground
behind the output capacitors.
VIN
4
RT8024
VIN LX
3
L1
1 EN
C3
J1
FB 5
GND 2
VIN
RT8024
VOUT
C1
R1
C4
C2 R2 10uF
Suggested Inductors
Component
Supplier
TAIYO YUDEN
TAIYO YUDEN
Sumida
Sumida
GOTREND
GOTREND
Series
NR 3015
NR 3015
CDRH2D14
CDRH2D14
GTSD32
GTSD32
Inductance
(µH)
2.2
4.7
2.2
4.7
2.2
4.7
DCR
(mΩ)
60
120
75
135
58
146
Figure 6. EVB Schematic
Current Rating
(mA)
1480
1020
1500
1000
1500
1100
Dimensions
(mm)
3 x 3 x 1.5
3 x 3 x 1.5
4.5 x 3.2 x 1.55
4.5 x 3.2 x 1.55
3.85 x 3.85 x 1.8
3.85 x 3.85 x 1.8
Suggested Capacitors for CIN and COUT
Component Supplier
TDK
TDK
MURATA
MURATA
MURATA
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Part No.
C1608JB0J475M
C2012JB0J106M
GRM188R60J475KE19
GRM219R60J106ME19
GRM219R60J106KE19
JMK107BJ475RA
JMK107BJ106MA
JMK212BJ106RD
Capacitance (µF)
4.7
10
4.7
10
10
4.7
10
10
Case Size
0603
0805
0603
0805
0805
0603
0603
0805
DS8024-02 March 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT8024.PDF ] | |
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