RT8024GB Richtek USA Inc, RT8024GB Datasheet

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RT8024GB

Manufacturer Part Number
RT8024GB
Description
IC DCDC CONV STP-DN ADJ SOT23-5
Manufacturer
Richtek USA Inc
Type
Step-Down (Buck), PWM - Current Moder
Datasheet

Specifications of RT8024GB

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.6 V ~ 5.5 V
Current - Output
400mA
Frequency - Switching
1.5MHz
Voltage - Input
2.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SC-74A, SOT-753
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
RT8024GB
Manufacturer:
ST
0
Part Number:
RT8024GB
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
1.5MHz, 400mA, High Efficiency PWM Step-Down
DC/DC Converter
General Description
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 R
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 0.1 A 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
DS8024-01 February 2011
SOT-23-5/TSOT-23-5
FB/VOUT
(TOP VIEW)
EN GND LX
5
2
VIN
4
3
DS(ON)
dramatically
RT8024(-
Features
l
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l
l
l
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Applications
l
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Ordering Information
Note :
Richtek Green products are :
}
}
2.5V to 5.5V Input Range
Adjustable Output From 0.6V to V
1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/
Adjustable Output Voltage
400mA Output Current, 1A Peak Current
95% Efficiency
No Schottky Diode Required
1.5MHz Fixed Frequency PWM Operation
Small SOT-23-5 and TSOT-23-5 Package
RoHS Compliant and Halogen Free
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
ments of IPC/JEDEC J-STD-020.
)
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
IN
RT8024
www.richtek.com
1

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RT8024GB Summary of contents

Page 1

High Efficiency PWM Step-Down DC/DC Converter General Description 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 ...

Page 2

RT8024 Typical Application Circuit 2.2V to 5.5V 2. OUT REF R2 with R2 = 300k to 60k so the I and (R1 x C1) should be in the range between 3x10 Layout Guide ...

Page 3

Functional Pin Description Pin No. Pin Name GND VIN 5 FB/VOUT Function Block Diagram Slope Compensation FB/VOUT Error Amplifier COMP DS8024-01 February 2011 Chip Enable (Active High, do not leave EN pin floating, and ...

Page 4

RT8024 Absolute Maximum Ratings Supply Input Voltage ---------------------------------------------------------------------------------------------------- 6.5V l Enable, FB Voltage ------------------------------------------------------------------------------------------------------ V l Power Dissipation SOT-23-5, TSOT-23-5 --------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 2) l SOT-23-5, TSOT-23-5, ---------------------------------------------------------------------------------------------- ...

Page 5

Parameter FB Input Current PMOSFET R ON NMOSFET R ON P-Channel Current Limit EN High-Level Input Voltage EN Low-Level Input Voltage Undervoltage Lock Out threshold Hysteresis Oscillator Frequency Thermal Shutdown Temperature Min. On Time Max. Duty Cycle LX Leakage Current ...

Page 6

RT8024 Typical Operating Characteristics Efficiency vs. Load Current 100 0.01 0.11 0.21 Load Current (A) Output Voltage vs. Load Current 1.220 1.215 1.210 1.205 1.200 1.195 ...

Page 7

Output Voltage vs. Temperature 1.25 1.23 1.21 1.19 1.17 1.15 -50 - Temperature (°C) Load Transient Response V = 3.3V 1.2V OUT V OUT (20mV/Div) I OUT (200mA/Div) Time (50μs/Div) Power ...

Page 8

RT8024 Applications Information The basic RT8024 application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and operating frequency followed by C and ...

Page 9

Special polymer capacitors offer very low ESR but have lower capacitance density than other types. Tantalum capacitors have the highest capacitance density but it is important to ...

Page 10

RT8024 2 curves. Thus, to obtain I R losses, simply add R and multiply the result by the square of the average output current. Other losses including C and C IN losses and inductor core losses generally account for less ...

Page 11

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 ...

Page 12

RT8024 Outline Dimension Symbol www.richtek.com Dimensions In Millimeters Min Max 0.889 1.295 0.000 0.152 1.397 1.803 0.356 0.559 2.591 2.997 2.692 3.099 0.838 ...

Page 13

Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to be ...

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