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SPX29151 데이터시트 PDF




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부품번호 SPX29151 기능
기능 1.5A Low Dropout Voltage Regulator
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SPX29151 데이터시트, 핀배열, 회로
SPX29150/51/52/53
1.5A Low Dropout Voltage Regulator
FEATURES
■ Adjustable Output Down to 1.25V
■ 1% Output Accuracy
■ Output Current of 1.5A
■ Low Dropout Voltage of 390mV @ 1.5A
■ Extremely Tight Load and Line
Regulation
■ Extremely Fast Transient Response
■ Reverse-Battery Protection
■ Zero Current Shutdown (5 pin version)
■ Error Flag Signal Output for Out of
Regulation State (5 pin version)
■ Standard TO-220 and TO-263
Packages
APPLICATIONS
■ Powering VGA and Sound Cards
■ LCD Monitors
■ USB Power Supplies
■ PowerPC™ Supplies
■ SMPS Post Regulators
■ High-efficiency “Green” Computer
Systems
■ High-efficiency Linear Power Supplies
■ Portable Instrumentation
■ Constant Current Regulators
■ Adjustable Power Supplies
■ Battery Chargers
DESCRIPTION
The SPX29150/51/52/53 are 1.5A, highly accurate voltage regulators with a low dropout
voltage of 390mV (typical) @ 1.5A. These regulators are specifically designed for low volt-
age applications that require a low dropout voltage and a fast transient response. They are
fully fault protected against over-current, reverse battery, and positive and negative voltage
transients. On-chip trimming adjusts the reference voltage to 1% initial accuracy. Other
features in the 5 pin versions include Enable and Error Flag.
The SPX29150/51/52/53 is offered in 3-pin and 5-pin TO-220 & TO-263 packages. For a 3A
version, refer to the SPX29300 data sheet.
TYPICAL APPLICATION CIRCUITs
VIN
+
6.8µ F
1 SPX29150 3
2
VOUT
+ 10µ F
VIN
+
6.8µ F
1 SPX29152 4
2
3
GND
5
ADJ
VOUT
+
R1
10µ F
R2
Figure 1. Fixed Output Linear Regulator
Figure 2. Adjustable Output Linear Regulator
REV B 06/05/08
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator
1
© Copyright 2008 Exar Corporation




SPX29151 pdf, 반도체, 판매, 대치품
TYPICAL PERFORMANCE CHARACTERISTICS
3.320
3.315
3.310
3.305
3.300
3.295
3.290
3.285
3.3V Device
IL = 10mA
CL = 10uF
3.280
4 6 8 10 12 14 16
Vin (V)
Figure 3. Line Regulation
3.310
3.305
3.300
3.295
3.290
3.285
3.3V Device
Vin = 4.3V
CL = 10µF
3.280
0
0.25 0.5
0.75
IL (A)
1
1.25 1.5
Figure 4. Load Regulation
80.0
70.0
60.0
50.0
40.0
30.0
20.0 3.3V Device
Vin = 4.3V
10.0 CL = 10uF
0.0
0
0.25 0.5 0.75 1
IL (A)
1.25 1.5
Figure 5. Ground Current vs Load Current
300
280
260
240
220
200
180
4
3.3V Device
IL = 10mA
CL = 10uF
6 8 10 12 14 16
Vin (V)
Figure 6. Ground Current vs Input Voltage
100
90
80
70
60
50
40
30 3.3V Device
20 Vin = 3.2V
10 CL = 10uF
0
0 0.25 0.5 0.75 1
1.25 1.5
IL (A)
Figure 7. Ground Current vs Load Current in Dropout
600
500
400
300
200
3.3V Device
100 CL = 10uF
0
0 0.25 0.5 0.75 1 1.25 1.5
IL (A)
Figure 8. Dropout Voltage vs Load Current
REV B 06/05/08
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator

© Copyright 2008 Exar Corporation

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SPX29151 전자부품, 판매, 대치품
The SPX29150/51/52/53 incorporates pro-
tection against over-current faults, reversed
load insertion, over temperature operation,
and positive and negative transient volt-
ages.
Thermal Considerations
Although the SPX29150/51/52/53 offers
limiting circuitry for overload conditions, it is
still necessary to insure that the maximum
junction temperature is not exceeded in the
application. Heat will flow through the lowest
resistance path, the junction-to-case path.
In order to insure the best thermal flow of
the component, proper mounting is required.
Consult the heatsink manufacturer for ther-
mal resistance and heat sink design.
TO-220 Design Example:
Assume that VIN = 10V, VOUT = 5V, IOUT =
1.5A, TA = 50°C, θH= 1°C/W, θCH= 2°C/W,
and θJC= 3C°/W, where:
TA = ambient temperature,
θHA = heatsink to ambient thermal resis-
tance
θCH = case to heatsink thermal resistance
θJC = junction to case thermal resistance
The power calculated under these condi-
tions is:
PD = (VIN – VOUT) * IOUT = 7.5W.
And the junction temperature is calculated
as
TJ = TA + PD * (θHA + θCH + θJC) or
APPLICATION INFORMATION
TJ = 50 + 7.5 * (1+2+3) = 95°C
Reliable operation is insured.
Capacitor Requirements
The output capacitor is needed to insure
stability and minimize the output noise. The
value of the capacitor varies with the load.
However, a minimum value of 10µF alumi-
num capacitor will guarantee stability over all
load conditions. A tantalum capacitor is rec-
ommended if a faster load transient response
is needed. If the power source has a high
AC impedance, a 0.1µF ceramic capacitor
between input & ground is recommended.
The output capacitors maximum ESR value
for stable operation is 0.33ohms.
Minimum Load Current
To ensure proper behavior of the regulator
under light loads, a minimum load of 5mA
for SPX29150/51/52/53 is required.
Typical Application Circuits
Figure 19 represents a typical fixed output
regulator. Figure 20 represents an adjustable
output regulator. The values of R1 and R2
set the output voltage value as follows: VOUT
=VREF * [1 + (R1/R2)]. A minimum value of
10kΩ is recommended for R2 with a range
between 10kΩ and 47kΩ.
VIN
+
6.8µF
SPX29150
VOUT
+ 10µF
VIN
+
6.8µ F
1 SPX29152 4
2
3
GND
5
ADJ
VOUT
+
R1
10µ F
R2
Figure 19. Fixed Output Linear Regulator
Figure 20. Adjustable Output Linear Regulator
REV B 06/05/08
SP29150/51/52/53 1.5A Low Dropout Voltage Regulator

© Copyright 2008 Exar Corporation

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관련 데이터시트

부품번호상세설명 및 기능제조사
SPX29150

1.5A Low Dropout Voltage Regulator

Exar
Exar
SPX29150

(SPX29150 - SPX29153) Low Dropout Voltage Regulator

Sipex Corporation
Sipex Corporation

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