RT8008-25GJ5 Richtek USA Inc, RT8008-25GJ5 Datasheet

no-image

RT8008-25GJ5

Manufacturer Part Number
RT8008-25GJ5
Description
IC DC-DC REG STPDN SYNC TSOT23-5
Manufacturer
Richtek USA Inc
Type
Step-Down (Buck), PWMr
Datasheet

Specifications of RT8008-25GJ5

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
2.5V
Current - Output
600mA
Frequency - Switching
1.5MHz
Voltage - Input
2.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5 Thin, TSOT-23-5
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
RT8008-25GJ5
Manufacturer:
RICHTE
Quantity:
2 231
Part Number:
RT8008-25GJ5
Manufacturer:
RICHTEK/立錡
Quantity:
20 000
1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC
Converter
General Description
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 R
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
DS8008-06 March 2011
SOT-23-5/TSOT-23-5
FB/VOUT
(TOP VIEW)
EN GND LX
5
2
VIN
4
3
DS(ON)
dramatically
Features
Applications
Ordering Information
Note :
Richtek products are :
RT8008(-
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
600mA 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 100% Lead (Pb)-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
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
IN
RT8008
www.richtek.com
1

Related parts for RT8008-25GJ5

RT8008-25GJ5 Summary of contents

Page 1

... 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 ...

Page 2

... R2 = 300kΩ to 60kΩ so the I and (R1 x C1) should be in the range between 3x10 Layout Guide GND VIN VOUT GND Layout note: 1. The distance that C connects should be placed near RT8008. OUT www.richtek.com VIN 2. RT8008 4.7µ VOUT GND 2 Figure 1. Fixed Voltage Regulator 4 V ...

Page 3

... Chip Enable (Active High, do not leave EN pin floating, and V Ground. Pin for Switching. Power Input. Feedback Input Pin. EN OSC & Shutdown Control Current Sense PWM Comparator RC UVLO & Power Good Detector V REF Pin Function EN VIN Current Limit Detector Control Driver Logic Zero Detector GND RT8008 < 0.6V). IN RS1 LX RS2 www.richtek.com 3 ...

Page 4

... RT8008 Absolute Maximum Ratings Supply Input Voltage ------------------------------------------------------------------------------------------------------ 6.5V Enable, FB Voltage ------------------------------------------------------------------------------------------------------- V Power Dissipation 25° SOT-23-5, TSOT-23-5 ----------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 2) SOT-23-5, TSOT-23-5, θ ----------------------------------------------------------------------------------------------- 250°C/W JA SOT-23-5, TSOT-23-5, θ ----------------------------------------------------------------------------------------------- 130°C/W JC Junction Temperature Range -------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C Storage Temperature Range -------------------------------------------------------------------------------------------- − ...

Page 5

... RDS(ON) OUT 200mA RDS(ON) OUT 2.5V to 5.5 V P(LM 2.5V to 5.5V ENH 2.5V to 5.5V ENL 3.6V 100mA OSC IN OUT 3.6V 25° low effective single layer thermal conductivity test board of A RT8008 Min Typ − 1.8 -- 0.1 1.2 1.5 -- ...

Page 6

... RT8008 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 1.190 1.185 1.180 0 0.1 0.2 Load Current (A) Frequency vs. Input Voltage 1.50 1.48 1.45 1.43 1.40 1.38 1.35 2 ...

Page 7

... V OUT (500mV/Div (200mA/Div) Output Voltage vs. Temperature 1.25 1.23 1.21 1.19 1.17 V 1.15 -50 - Temperature (°C) Load Transient Response V = 3.3V 1.2V 300mA to 600mA IN OUT OUT Time (50μs/Div) Power 3.3V 1.2V 600mA IN OUT OUT EN Time (100μs/Div) RT8008 = 3.3V OUT 75 100 125 www.richtek.com 7 ...

Page 8

... RT8008 Power Off V = 3.3V 1.2V OUT V EN (2V/Div) V OUT (500mV/Div (200mA/Div) Time (100μs/Div) www.richtek.com 8 = 600mA OUT DS8008-06 March 2011 ...

Page 9

... Applications Information The basic RT8008 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 OUT Inductor Selection For a given input and output voltage, the inductor value and operating frequency determine the ripple current. The ripple current Δ ...

Page 10

... IN part. Output Voltage Programming The resistive divider allows the V of the output voltage as shown in Figure 4. FB RT8008 GND Figure 4. Setting the Output Voltage For adjustable about voltage mode, the output voltage is set by an external resistive divider according to the following equation : R1 ...

Page 11

... 250 = 0.4 W for SOT-23-5/ D(MAX) TSOT-23-5 packages The maximum power dissipation depends on operating ambient temperature for fixed T resistance . For RT8008 packages, the Figure derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. The value of junction to case thermal resistance popular for users ...

Page 12

... RT8008 Connect feedback network behind the output capacitors. } Keep the loop area small. Place the feedback components near the RT8008. 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 Figure 8 for reference ...

Page 13

... SOT-23-5 Surface Mount Package RT8008 H L Dimensions In Inches Min Max 0.035 0.051 0.000 0.006 0.055 0.071 0.014 0.022 0.102 0.118 0.106 0.122 0.033 ...

Page 14

... RT8008 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 accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application ...

Related keywords