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Regulator Adjustable. SPX2840 Datasheet |
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FEATURES
• Adjustable Output Down To 1.25V Or Fixed 3.3V
• Output Current Of 4A
• Low Dropout Voltage
• Extremely Tight Load And Line Regulation
• Current & Thermal Limiting
• Standard 3-Terminal Low Cost TO-220
SPX2840
4A Low Dropout Voltage Regulator
Adjustable & Fixed 3.3V
APPLICATIONS
• Powering Intel Pentium µP from +5V Supplies
• Power PC Supplies
• 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 SPX2840 is a low power 4A Adjustable Voltage Regulator that is very easy to use. It requires only 2 external resistors to set the
output voltage. This device is an excellent choice for use in Powering Intel Microprocessor to convert from +5V to 3.3V supplies
and as a post regulator for switching supplies applications. The SPX2840 features low dropout of a maximum 1.3 volts.
The SPX2840 offers over-current limit and full protection against reversed input polarity, reversed load insertion, over temperature
operation, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The IQ of this device
flows in to the load, which increases the efficiency.
The SPX2840 is offered in a 3-pin TO-220 package compatible with other 3 terminal regulators. For a 3A low dropout regulator refer
to the SPX2830 data sheet.
ORDERING INFORMATION
TO-220-3 (U)
SPX2840
123
ADJ/GND VOUT VIN
Front View
Rev. 10/23/00
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ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C
Storage Temperature Range ............................ -65° to +150°C
Operating Junction Temperature Range
SPX2840 Control Section..........................0C° to +125°C
SPX2840 Power Transistor........................0C° to +150°C
SPX2840
Input Supply Voltage .................................................... +10V
Input to Output Voltage Differential ............................. +10V
ELECTRICAL CHARACTERISTICS.(NOTE 1) at IOUT = 10mA, TA=25°C, unless otherwise specified.
Parameter
Conditions
SPX2840
Min Typ
Reference Voltage
1.238
1.250
Min. Load Current
Line Regulation
Load Regulation
Dropout Voltage
10 mA ≤ IOUT ≤ IFULLLOAD
1.5V≤(VIN - VOUT ≤ 7V ( Over Temperature)
(VIN-VOUT) + 25V
1.5V ≤VIN - VOUT ≤7V
ILOAD = 10mA
15V ≤VIN - VOUT ≤7V
10 mA ≤ IOUT ≤ IFULLLOAD
(VIN - VOUT)=3V
IOUT=IFULLLOAD , ∆VREF=1%
1.225
1.250
5
0.015
0.035
0.05
0.1
0.2
1.1
Current Limit
Long Term Stability
VIN - VOUT=5V
VIN - VOUT=25V
TA=125°C, 1000 Hrs.
5.5 6.5
0.3 0.6
0.3
Adjust Pin Current
TA=25°C
55
Adjust Pin Current Change
0.2
Thermal Regulation
30 ms pulse
0.003
Temperature Stability
0.5
Ripple Rejection Ratio
Output Noise, RMS
VIN - VOUT=3V
60 75
IOUT =3A, COUT = 25µF, CADJ = 25µF, f= 120Hz
10Hz to 10kHz
0.003
Max
1.262
1.270
10
0.2
0.2
0.5
0.3
0.4
1.3
1
120
5
0.015
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: A 10µF output capacitor is required on SPX2840.
Units
V
V
mA
%
%
%
%
%
V
A
A
%
µA
µA
µA
%/W
%
dB
% VO
Rev. 10/23/00
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TYPICAL CHARACTERISTICS
SPX2840
Rev. 10/23/00
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