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PDF IRU1075 Data sheet ( Hoja de datos )
| Número de pieza | IRU1075 | |
| Descripción | 7.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IRU1075 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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FEATURES
1V Dropout at Full Load Current
Fast Transient Response
1% Voltage Reference Initial Accuracy
Output Current Limiting
Built-In Thermal Shutdown
APPLICATIONS
Low Voltage Processor Applications such as:
P54C,P55C, Cyrix M2,
POWER PC, AMD
GTL+ Termination
PENTIUM PRO, KLAMATH
Low Voltage Memory Termination Applications
Standard 3.3V Chip Set and Logic Applications
TYPICAL APPLICATION
Data Sheet No. PD94128
IRU1075
7.5A LOW DROPOUT POSITIVE
ADJUSTABLE REGULATOR
DESCRIPTION
The IRU1075 is a low dropout three-terminal adjustable
regulator with minimum of 7.5A output current capabil-
ity. This product is specifically designed to provide well
regulated supply for low voltage IC applications such as
Pentium P54C, P55C as well as GTL+ termina-
tion for Pentium Pro and Klamath processor appli-
cations. The IRU1075 is also well suited for other pro-
cessors such as Cyrix, AMD and Power PC appli-
cations. The IRU1075 is guaranteed to have <1.2V drop-
out at full load current making it ideal to provide well
regulated outputs such as 3.3V with input supply volt-
age as low as 4.5V minimum.
5V
C1
1500uF
Vin 3
1075app1-1.0
IRU1075 Vout 2
Adj 1
3.3V
R1
121
C2
R2 2x 1500uF
200
Typical application of IRU1075 in a 5V to 3.3V regulator
Notes: Pentium P54C, P55C, Klamath, Pentium Pro, VRE are trademarks of Intel Corp. Cyrix M2 is trademark of Cyrix Corp.
Power PC is trademark of IBM Corp.
PACKAGE ORDER INFORMATION
Tj (°C)
0 To 150
3-PIN PLASTIC
TO-220 (T)
IRU1075CT
3-PIN PLASTIC
TO-263 (M)
IRU1075CM
3-PIN PLASTIC
Ultra Thin-Pak (P)
IRU1075CP
Rev. 1.1
06/29/01
1
1 page  
IRU1075
Assuming the following specifications:
VIN = 5V
VOUT = 3.5V
IOUT(MAX) = 4.6A
TA = 35!C
The steps for selecting a proper heat sink to keep the
junction temperature below 135°C is given as:
1) Calculate the maximum power dissipation using:
PD = IOUT × (VIN - VOUT)
PD = 4.6 × (5 - 3.5) = 6.9W
2) Select a package from the regulator data sheet and
record its junction to case (or tab) thermal resistance.
Selecting TO-220 package gives us:
θJC = 2.7!C/W
3) Assuming that the heat sink is black anodized, cal-
culate the maximum heat sink temperature allowed:
Assume, θcs = 0.05°C/W (heat-sink-to-case ther-
mal resistance for black anodized)
4) With the maximum heat sink temperature calculated
in the previous step, the heat-sink-to-air thermal re-
sistance (θSA) is calculated by first calculating the
temperature rise above the ambient as follows:
∆T = TS - TA = 116 - 35 = 81!C
∆T = Temperature Rise Above Ambient
θSA
=
∆T
PD
=
81
6.9
=
11.7!C/W
5) Next, a heat sink with lower θsa than the one calcu-
lated in Step 4 must be selected. One way to do this
is to simply look at the graphs of the “Heat Sink Temp
Rise Above the Ambient” vs. the “Power Dissipation”
and select a heat sink that results in lower tempera-
ture rise than the one calculated in previous step.
The following heat sinks from AAVID and Thermalloy
meet this criteria.
Thermalloy
AAVID
Air Flow (LFM)
0 100 200 300 400
6021PB 6021PB 6073PB 6109PB 7141D
534202B 534202B 507302 575002 576802B
TS = TJ - PD × (θJC + θCS)
TS = 135 - 6.9 × (2.7 + 0.05) = 116!C
Rev. 1.1
06/29/01
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IRU1075.PDF ] | |
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