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PDF RT8026 Data sheet ( Hoja de datos )
| Número de pieza | RT8026 | |
| 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 RT8026 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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RT8026
1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC
Converter
General Description
The RT8026 is a high-efficiency Pulse-Width-Modulated
(PWM) step-down DC/DC converter. Capable of delivering
1A output current over a wide input voltage range from
2.7V to 5.5V, the RT8026 is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources such as cellular
phones, PDAs and hand-held devices.
Two operating modes are available including : PWM/Low-
Dropout autoswitch and shut-down modes. The Internal
synchronous rectifier with low RDS(ON) dramatically reduces
conduction loss at PWM mode. No external Schottky
diode is required in practical application.
The RT8026 enters Low-Dropout mode when normal PWM
cannot provide regulated output voltage by continuously
turning on the upper P-MOSFET. The RT8026 enter shut-
down mode and consumes less than 0.1μA when the EN
pin is pulled low.
The switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operating
frequency of 1.5MHz. This along with small MSOP-10
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.
Ordering Information
RT8026
Package Type
F : MSOP-10
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Features
z Input Voltage Range : 2.7V to 5.5V
z Adjustable Output Voltage : 1V to VIN
z Output Current : 1A
z High Efficiency : up to 95%
z No Schottky Diode Required
z 1.5MHz Fixed Frequency PWM Operation
z Current Limiting Protection
z Thermal Shutdown Protection
z Small MSOP-10 Package
z RoHS Compliant and Halogen Free
Applications
z Mobile Phones
z Personal Information Appliances
z Wireless and DSL Modems
z MP3 Players
z Portable Instruments
Pin Configurations
(TOP VIEW)
VIN
NC
GND
NC
FB
10
29
38
47
56
MSOP-10
PGND
LX
EN
NC
NC
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS8026-02 March 2011
www.richtek.com
1
1 page  
Typical Operating Characteristics
100
90
80
70
60
50
40
30
20
10
0
0.001
Efficiency vs. Output Current
VIN = 5V
VIN = 5.5V
VOUT = 3.5V
0.01
0.1
Output Current (A)
1
1.50
1.48
1.45
1.43
1.40
1.38
1.35
1.33
1.30
4
Frequency vs. Input Voltage
VOUT = 3.5V, IOUT = 300mA
4.25 4.5 4.75 5 5.25 5.5
Input Voltage (V)
Current Limit vs. Input Voltage
1.70
1.65
1.60
1.55
1.50
1.45
1.40
4
VOUT = 3.5V
4.25 4.5 4.75 5 5.25 5.5
Input Voltage (V)
DS8026-02 March 2011
RT8026
Output Voltage vs. Temperature
3.60
3.58
3.55
3.53
3.50
3.48
3.45
3.43
3.40
-50
-25
VIN = 5V, IOUT = 0mA
0 25 50 75
Temperature (°C)
100 125
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
-50
Frequency vs. Temperature
VIN = 5V, VOUT = 3.5V, IOUT = 300mA
-25 0
25 50 75 100 125
Temperature (°C)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
Current Limit vs. Temperature
VIN = 5V, VOUT = 3.5V
-25 0
25 50 75 100 125
Temperature (°C)
www.richtek.com
5
5 Page 
RT8026
CIN must be placed as close
as possible to the IC
CIN
LX should be connected to Inductor by
wide and short trace, keep sensitive
compontents away from this trace
Output capacitor must
RT8026
be placed near the
RT8026
VIN 10 PGND
L1
NC 2
9 LX
COUT
GND
R2 NC
3
4
8 EN
7 NC VIN
FB 5 6 NC
R1 CF
Layout note:
Place the feedback components as close as possible
to the FB pin.
1. The distance that CIN connects to VIN is as close as possible (Under 2mm).
2. COUT should be placed near the RT8026.
Figure 4. Layout Guide
Table 1. Recommended Components for Different Output Voltage Application
Component Supplier
TAIYO YUDEN
TAIYO YUDEN
GOTREND
GOTREND
GOTREND
L1 (μH)
10
10
2.2
2.2
2.2
COUT (μF)
10
10
10
10
10
R1 (kΩ)
300
120
200
150
100
R2 (kΩ)
62
27
62
75
100
VOUT (V)
3.5
3.3
2.5
1.8
1.2
DS8026-02 March 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8026.PDF ] | |
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