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PDF IRU1010 Data sheet ( Hoja de datos )
| Número de pieza | IRU1010 | |
| Descripción | 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR | |
| Fabricantes | International Rectifier | |
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Data Sheet No. PD94119 revA
IRU1010(PbF)
FEATURES
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Built-In Thermal Shutdown
Available in SOT-223, D-Pak, Ultra Thin-PakTM
and 8-Pin SOIC Surface-Mount Packages
APPLICATIONS
VGA & Sound Card Applications
Low Voltage High Speed Termination Applications
Standard 3.3V Chip Set and Logic Applications
1A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
The IRU1010 is a low dropout, three-terminal adjustable
regulator with minimum of 1A output current capability.
This product is specifically designed to provide well regu-
lated supply for low voltage IC applications such as high
speed bus termination and low current 3.3V logic sup-
ply. The IRU1010 is also well suited for other applica-
tions such as VGA and sound cards. The IRU1010 is
guaranteed to have <1.3V dropout at full load current
making it ideal to provide well regulated outputs of 2.5V
to 3.6V with 4.75V to 7V input supply.
TYPICAL APPLICATION
D1
5V
C1
10uF
VIN 3
IRU1010
VOUT 2
Adj 1
2.85V / 1A
R1
121
C2
R2 22uF
154
Figure 1 - Typical application of IRU1010 in a 5V to 2.85V SCSI termination regulator.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 150
TJ (°C)
0 To 150
2-PIN PLASTIC
TO-252 (D-Pak)
IRU1010CD
2-PIN PLASTIC
TO-252 (D-Pak)
Not available
Basic Part (Non-Lead Free)
2-PIN PLASTIC
Ultra Thin-PakTM (P)
IRU1010CP
8-PIN PLASTIC
SOIC (S)
IRU1010CS
Leadfree Part
2-PIN PLASTIC
Ultra Thin-PakTM (P)
Not available
8-PIN PLASTIC
SOIC (S)
IRU1010CSPbF
3-PIN PLASTIC
SOT-223 (Y)
IRU1010CY
3-PIN PLASTIC
SOT-223 (Y)
Not available
Rev. 1.7
www.irf.com
1
1 page  
IRU1010(PbF)
Assuming the following specifications:
VIN = 5V
VF = 0.5V
VOUT = 2.85V
IOUT(MAX) = 0.8A
TA = 35 C
Where: VF is the forward voltage drop of the D1 diode as
shown in Figure 5.
The steps for selecting the right package with proper
board area for heatsinking to keep the junction tempera-
ture below 135 C is given as:
To set the output DC voltage, we need to select R1 and
R2:
4) Assuming R1 = 121Ω, 1%:
( ) ( )R2 =
VOUT
VREF
-1
×R1 =
2.85
1.25
-1
×121
=
154.8Ω
Select R2 = 154Ω, 1%.
D1
5V
C1
10uF
VIN VOUT
IRU1010
2.85V
C2
22uF
1) Calculate the maximum power dissipation using:
PD = IOUT × (VIN - VF - VOUT)
PD = 0.8 × (5 - 0.5 - 2.85) = 1.32W
2) Calculate the maximum θJA allowed for our example:
θJA(MAX) =
TJ - TA
PD
=
135 - 35
1.32
= 75.6 C/W
Adj R1
121
1%
R2
154
1%
Figure 5 - Final Schematic for half of the
GTL+ termination regulator.
3) Select a package from the datasheet with lower θJA
than the one calculated in the previous step.
Selecting TO-252 (D-Pak) with at least 0.5" square
of 0.062" FR4 board using 1 oz. copper has 70°C/W
which is lower than the calculated number.
Layout Consideration
The output capacitors must be located as close to the
VOUT terminal of the device as possible. It is recom-
mended to use a section of a layer of the PC board as a
plane to connect the VOUT pin to the output capacitors to
prevent any high frequency oscillation that may result
due to excessive trace inductance.
Rev. 1.7
www.irf.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet IRU1010.PDF ] | |
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