US1010 Datasheet PDF - UNISEM
| Part Number | US1010 | |
| Description | 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR | |
| Manufacturers | UNISEM | |
| Logo |  |
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US1010
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 , Power Flex
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
PRELIMINARY DATASHEET
DESCRIPTION
The US1010 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
supply. The US1010 is also well suited for other appli-
cations such as VGA and sound cards. The US 1010 is
guaranteed to have <1.3V drop out at full load cur-
rent 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
US1010
Vout 2
Adj 1
1010app1-1.4
2.85V / 1A
R1
121
C2
R2 22uF
154
Typical Application of US1010 in a 5V to 2.85V SCSI termination regulator .
PACKAGE ORDER INFORMATION
Tj (°C)
0 TO 150
2 PIN PLASTIC
TO252 (D)
US1010CD
3 PIN PLASTIC 2 PIN PLASTIC
SOT223 (Y) POWER FLEX (P)
US1010CY
US1010CP
8 PIN PLASTIC
SOIC (S)
US1010CS
Rev. 1.3
10/30/00
2-1
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US1010
Thermal Design
The US1010 incorporates an internal thermal shutdown
that protects the device when the junction temperature
exceeds the maximum allowable junction temperature.
Although this device can operate with junction tempera-
tures in the range of 150°C ,it is recommended that the
selected heat sink be chosen such that during maxi-
mum continuous load operation the junction tempera-
ture is kept below this number. The example below for
a SCSI terminator application shows the steps in se-
lecting the proper regulator in a surface mount pack-
age .(See US1015 for non surface mount packages)
Assuming the following specifications :
VIN = 5V
VF = 0.5V
VO = 2.85V
IOUTMAX = 0.8A
TA = 35° C
Where ; VF is the forward voltage drop of the D1diode
as shown in figure 4.
The steps for selecting the right package with proper
board area for heatsinking to keep the junction tem-
perature below 135°C is given as :
To set the output DC voltage, we need to select R1 and
R2 :
3) Assuming R1=121 Ω , 1%
R2
=
VOUT
VREF
− 1
× 121=
2.85
1.25
− 1
× 121 =
154.8
Ω
Select R2=154 Ω ,1%
D1
5V
C1
10uF
Vin Vout
US1010
Adj
2.85V
C2
22uF
R1
121
1%
R2
154
1%
1010app4-1.3
Figure 4 - Final Schematic for half of the
GTL+ termination regulator.
1) Calculate the maximum power dissipation using :
Layout Consideration
( )PD = IOUT × VIN − VF − VOUT
PD = 0.8 × (5 − 0.5 − 2.85) = 1.32 W
2) Calculate the maximum θJA allowed for our ex-
ample:
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.
θJAMAX = TJ − TA
PD
θJAMAX = 135 − 35 = 75.6° C / W
1.32
2) Select a package from the datasheet with lower θJA
than the one calculated in the previous step.
Selecting TO252 (D Pak) with at least 0.5" square of
0.062" FR4 board using 1OZ copper has 70°C/W
which is lower than the calculated number.
Rev. 1.3
10/30/00
2-5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for US1010 electronic component. |
| Information | Total 5 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ US1010.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| US1010 | The function is 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR. UNISEM | |
| US1010-25 | The function is 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR. UNISEM | |
| US1010-25CD | The function is 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR. UNISEM | |
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