Regulator Adjustable. SPX2870 Datasheet

SPX2870 Adjustable. Datasheet pdf. Equivalent


Sipex Corporation SPX2870
www.DataSheet4U.com
SPX2870
6.5A Low Dropout Voltage Regulator
Adjustable & Fixed Output,
Fast Response
FEATURES
Adjustable Output Down To 1.2V
Fixed Output Voltages 2.5, 3.3 & 5.0V
Output Current of 6.5A
Low Dropout Voltage 1.1V Typ.
Extremely Tight Load And Line Regulation
Current & Thermal Limiting
Standard 3-Terminal Low Cost TO-220 & TO-263
APPLICATIONS
Powering VGA & Sound Card
Power PCSupplies
SMPS Post-Regulator
High Efficiency “Green” Computer Systems
High Efficiency Linear Power Supplies
Portable Instrumentation
Constant Current Regulators
Adjustable Power Supplies
Battery charger
PRODUCT DESCRIPTION
The SPX2870 are low power 6.5A adjustable and fixed voltage regulators that are very easy to use. It requires only 2 external resistors
to set the output voltage for adjustable version. The SPX2870 are designed for low voltage applications that offers lower dropout
voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that require a
lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies
applications. The SPX2870 features low dropout of a maximum 1.5 volts.
The SPX2870 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and
negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The IQ of this device flows into the load, which
increases efficiency.
The SPX2870 are offered in a 3-pin TO-220 and TO-263 packages compatible with other 3 terminal regulators. For a 8A low dropout
regulator refer to the SPX2880 data sheet.
PIN CONNECTIONS
TO-263-3 (T)
TO-220-3 (U)
SPX2870
1 23
SPX2870
123
ADJ/GND VOUT VIN
Top View
ADJ/GND VOUT VIN
Front View
Rev. 10/30/00


SPX2870 Datasheet
Recommendation SPX2870 Datasheet
Part SPX2870
Description Low Dropout Voltage Regulator Adjustable
Feature SPX2870; www.DataSheet4U.com SPX2870 6.5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Resp.
Manufacture Sipex Corporation
Datasheet
Download SPX2870 Datasheet




Sipex Corporation SPX2870
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................ -65° to +150°C
Operating Junction Temperature Range
SPX2870 Control Section.......................... -45°C +125°C
SPX2870 Power Transistor.........................-45°C +150°C
SPX2870
Input Voltage........................................................ 10V
Input to Output Voltage Differential .................... 10V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, TA=25°C, unless otherwise specified.
PARAMETER
CONDITIONS
Typ SPX2870A
Min Max
2.5V Version
Output Voltage (Note 2)
SPX2870-2.5V, 0 < IOUT < 6.5A, 4.0V<VIN<7V
2.5 2.475 2.525
2.45 2.55
3.3V Version
Output Voltage (Note 2)
SPX2870-3.3V, 0 < IOUT < 6.5A, 4.8V<VIN<7V
3.3 3.267 3.333
3.234 3.366
5.0V Version
Output Voltage (Note 2)
SPX2870-5.0V, 0 IOUT 6.5A, 6.5VVIN7V
5 4.950 5.050
4.900 5.100
All Voltage Options
Reference Voltage (VREF)
VIN7V, PPMAX
1.5V(VIN -VOUT)5.75V, 10mAIOUT5A
1.250
1.225 1.270
Min. Load Current (Note 3)
Line Regulation (VREF(VIN))
Load Regulation(VREF(IOUT))
Dropout Voltage
1.5V(VIN –VOUT)5.75V
2.75VVIN 7V, IOUT=10mA, TJ=25ºC
(Note 3)
VIN 7V, IOUT=0mA, TJ=25ºC (Note 2)
10mAIOUT 5A, (Vin-VOUT)=3V, TJ=25ºC (Note 3)
0IOUT 5A, VIN=7V, TJ=25ºC (Note 2)
VREF=1%
IOUT = 6.5A (Note 3)
IOUT < 6.5A (Note 2)
5
0.005
0.005
0.05
0.05
10
0.2
0.2
0.3
0.3
1.5
Current Limit
IOUT(MAX)
Long Term Stability
VIN=7V
1.4V (VIN – VOUT) (Note3)
TA=125ºC, 1000 Hrs.
6 6.9
0.3
(Note 2)
1
Thermal Regulation
(VOUT(PWR))
TA=25ºC, 20 ms pulse
0.01
Temperature Stability
(VOUT(T))
0.25
Output Noise, RMS
Thermal Resistance
10Hz to 10kHz
TO-220
Ta=25ºC
Junction to Tab
Junction to Ambient
0.003
3.0
60
DD Package
Junction to Tab
Junction to Ambient
The Bold specifications apply to the full operating temperature range.
Note 1: Changes in output voltage due to heating effects are covered under the specification for thermal regulation.
Note 2: Fixed Version Only
Note 3: Adjustable Version Only
3.0
60
0.020
3.0
60
3.0
60
SPX2870
Min Max
UNITS
2.45
2.425
2.55
2.575
V
3.234
3.069
3.366
3.399
V
4.9 5.1
4.65 5.15
V
1.225
1.270
V
10 V
0.2 %
0.2
0.3 %
0.3
1.5 V
6.9 A
1%
0.020
%/W
%
% VO
3.0 ºC/W
60
3.0
60
Rev. 10/30/00



Sipex Corporation SPX2870
APPLICATION HINTS
The SPX2870 incorporates protection against over-current
faults, reversed load insertion, over temperature operation, and
positive and negative transient voltage. However, the use of
an output capacitor is required in order to insure the stability
and the performances.
Stability
The output capacitor is part of the regulator’s frequency
compensation system. Either a 220µF aluminum electrolytic
capacitor or a 47µF solid tantalum capacitor between the
output terminal and ground guarantees stable operation for all
operating conditions.
However, in order to minimize overshoot and undershoot, and
therefore optimize the design, please refer to the section
‘Ripple Rejection’.
Ripple Rejection
Ripple rejection can be improved by adding a capacitor
between the ADJ pin and ground. When ADJ pin bypassing is
used, the value of the output capacitor required increases to its
maximum (220µF for an aluminum electrolytic capacitor, or
47µF for a solid tantalum capacitor). If the ADJ pin is not
bypass, the value of the output capacitor can be lowered to
100µF for an electrolytic aluminum capacitor or 15µF for a
solid tantalum capacitor.
However the value of the ADJ-bypass capacitor should be
chosen with respect to the following equation:
C = 1 / ( 6.28 * FR * R1 )
Where C = value of the capacitor in Farads (select an
equal or larger standard value),
FR = ripple frequency in Hz,
R1 = value of resistor R1 in Ohms.
If an ADJ-bypass capacitor is use, the amplitude of the output
ripple will be independent of the output voltage. If an ADJ-
bypass capacitor is not used, the output ripple will be
proportional to the ratio of the output voltage to the reference
voltage:
M = VOUT / VREF
Where M = multiplier for the ripple seen when the ADJ pin
is optimally bypassed.
VREF = Reference Voltage
SPX2870
Reducing parasitic resistance and inductance
One solution to minimize parasitic resistance and inductance is
to connect in parallel capacitors. This arrangement will
improve the transient response of the power supply if your
system requires rapidly changing current load condition.
Thermal Consideration
Although the SPX2870 offers some limiting circuitry for
overload conditions, it is necessary not to exceed the
maximum junction temperature, and therefore to be careful
about thermal resistance. The heat flow will follow the lowest
resistance path, which is the Junction-to-case thermal
resistance. In order to insure the best thermal flow of the
component, a proper mounting is required. Note that the case
of the device is electrically connected to the output. In case
the case has to be electrically isolated, a thermally conductive
spacer can be used. However do not forget to consider its
contribution to thermal resistance.
Assuming:
VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C/W,
θHeat Case = 6°C/W, θ Heat Case = 0.5°C/W, θ JC = 3°C/W
Power dissipation under this condition
PD = (VIN – VOUT) * IOUT = 7.5W
Junction Temperature
TJ = TA + PD * (θCase – HS + θ HS + θ JC )
For the Control Sections
TJ = 50 + 7.5W*(0.5 +6=3) = 121.25°C
121.25°C < TJ(max) for the Control & Power Sections.
In both case reliable operation is insured by adequate junction
temperature.
Rev. 10/30/00







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