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PDF RT9027B Data sheet ( Hoja de datos )
| Número de pieza | RT9027B | |
| Descripción | (RT9027A / RT9027B) Linear Fan Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9027B (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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RT9027A/B
Linear Fan Driver
General Description
The RT9027A/B is a high performance positive voltage
regulator designed for very low dropout voltage up to 0.5
Amps. The VSET voltage must be larger than 1V to guarantee
that VOUT is 1.6 times of VSET. When VSET is less than 1V,
the IC will be shutdown. The FON pin turns VOUT to fully-
on when FON is given low. For RT9027B (EN version),
FON pin is equivalent to EN pin. The RT9027A/B provides
excellent regulation over variations in line, load and
temperature. The RT9027A/B is available in the SOP-8
package.
Ordering Information
RT9027
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
A : FON Function
B : EN Function
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.
Typical Application Circuit
Features
z VOUT Follows 1.6 Times of VSET
z 150mV Dropout @ 0.5A
z Over Current and Over Temperature Protection
z FON Pin Turns VOUT Fully On
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Notebook Computer Fan Driver
z Battery Powered System
z Motherboard
z Peripheral Card
Pin Configurations
(TOP VIEW)
FON
VIN
VOUT
VSET
2
3
4
8 GND
7 GND
6 GND
5 GND
RT9027A
EN
VIN
VOUT
VSET
8
27
36
45
RT9027B
SOP-8
GND
GND
GND
GND
VIN
VSET
FON/EN
2 VIN
3
VOUT
CIN
2.2uF
RT9027A/B
4 VSET
1 FON/EN
GND 5 to 8
VOUT
COUT
2.2uF
DS9027A/B-01 October 2008
Downloaded from Elcodis.com electronic components distributor
www.richtek.com
1
Free Datasheet http://www.Datasheet-PDF.com/
1 page  
Typical Operating Characteristics
Output Voltage vs. VSET Voltage
6
5
4
IOUT = 0A
IOUT = 0.5A
3
2
1
0
0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2
VSET Voltage (V)
Output Voltage vs. Output Current
3.220
3.215
3.210
3.205
3.200
3.195
3.190
3.185
3.180
0
VSET = 2V
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Output Current (A)
1.600
Output Voltage vs. Input Voltage
1.599
1.598
1.597
IOUT = 0.5A
1.596
1.595
IOUT = 0A
1.594
1.593
1.592
1.591
1.590
VSET = 1V
4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5
Input Voltage (V)
DS9027A/B-01 October 2008
RT9027A/B
1.615
Output Voltage vs. Output Current
1.610
1.605
1.600
1.595
1.590
1.585
1.580
1.575
0
VSET = 1V
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Output Current (A)
Output Voltage vs. Output Current
4.815
4.810
4.805
4.800
4.795
4.790
4.785
4.780
4.775
0
VSET = 3V
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Output Current (A)
3.210
Output Voltage vs. Input Voltage
3.208
3.206
3.204
3.202
3.200
IOUT = 0.5A
3.198
3.196
IOUT = 0A
3.194
3.192
3.190
VSET = 2V
4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5
Input Voltage (V)
www.richtek.com
5
Downloaded from Elcodis.com electronic components distributor
Free Datasheet http://www.Datasheet-PDF.com/
5 Page 
The maximum power dissipation at TA = 25°C can be
calculated by following formula :
PD(MAX) = (125°C − 25°C) / 45°C/W = 2.22W for SOP-8
package
100
90
80
70
60
50
40
30
20
10
0
0
20 40 60 80
Copper Area (mm2)
Figure 1
100
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal resistance
θJA . For RT9027AB packages, the Figure 2 of de-rating
curves allows the designer to see the effect of rising
ambient temperature on the maximum power allowed.
2.4
2.2
2 50mm2
100mm2
JEDEC 4-layers PCB
1.8
1.6 25mm2
1.4
1.2
15mm2
1 min. layout
0.8
0.6
0.4
0.2
0
0 25 50 75 100 125
Ambiemt Temperature (℃°C)
Figure 2. De-rating Curves for RT9027AB Package
DS9027A/B-01 October 2008
Downloaded from Elcodis.com electronic components distributor
RT9027A/B
www.richtek.com
11
Free Datasheet http://www.Datasheet-PDF.com/
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9027B.PDF ] | |
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