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October 2010 Rev. 2.1.0
Exar Corporation www.exar.com
48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 – Fax. +1 510 668-7001
GENERAL DESCRIPTION
The SPX29300/01/02 are 3A, highly accurate
voltage regulators with a low dropout voltage
of 600mV (typical) at 3A.
These regulators are specifically designed for
low voltage 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.
The SPX29300 is offered in a 3-pin TO-263
package, the SPX29301 is offered in a 5-pin
TO-263 while SPX29302 is offered in a 5-pin
TO-263 and 5-pin TO-220 packages.
APPLICATIONS
• Adjustable Power Supplies
• Constant Current Regulators
• Audio and Video/Graphic Cards
• Battery Chargers
FEATURES
• 3A Guaranteed Output Current
• Low Dropout Voltage of 600mV @ 3A
• Adjustable Output down to 1.25V
• 1% Output Accuracy
• Tight Load and Line Regulation
• Fast Transient Response
• Reverse Battery Protection
• Zero Current Shutdown (SPX29301/02)
• Power Good Flag (SPX29301)
• Lead Free 3-Pin TO-263, 5-pin TO-220
and TO-263 Packages
TYPICAL APPLICATION DIAGRAM
Fig. 1: SPX29300 and SPX29302 Application Diagrams
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© 2010 Exar Corporation 2/10 Rev. 2.1.0
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
Input Voltage V
IN1
................................................... 20V
Storage Temperature .............................. -65°C to 150°C
Lead Temperature (Soldering, 5 sec) ..................... 260°C
ESD Rating (HBM - Human Body Model) ..........................
All pins except EN ................................................. 2kV
En pin ................................................................. 1kV
OPERATING RATINGS
Input Voltage Range V
IN
........................................... 16V
Junction Temperature Range .................... -40°C to 125°C
Thermal Resistance ......................................................
TO-220-5 Junction to Ambient ....................... 29.3°C/W
TO-263-3 Junction to Ambient ....................... 31.4°C/W
TO-263-5 Junction to Ambient ....................... 31.2°C/W
TO-220-5, TO-263-3, TO-263-5 Junction to Case .. 3°C/W
Note 1: Maximum positive supply voltage of 20V must be
of limited duration (<100ms) and duty cycle of less than
1%. The maximum continuous supply voltage is 16V.
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of T
J
= T
A
= 25°C only; limits applying over the
full Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at T
J
= 25°C, and are provided for
reference purposes only. Unless otherwise indicated, V
IN
= V
OUT
+ 1V and I
OUT
=10mA, C
IN
= 6.8µF, C
OUT
= 10µF, T
A
= 25°C.
Parameter Min. Typ. Max. Units Conditions
Fixed Voltage Versions
Output Voltage, 1.8V Version 1.782 1.800 1.818 V I
OUT
=10mA
1.764 1.800 1.836 • 10mA≤I
OUT
≤3A, 2.8V≤V
IN
≤16V
Output Voltage, 2.5V Version 2.475 2.500 2.525 V I
OUT
=10mA
2.450 2.500 2.550 • 10mA≤I
OUT
≤3A, 3.5V≤V
IN
≤16V
Output Voltage, 3.3V Version 3.267 3.300 3.333 V I
OUT
=10mA
3.234 3.300 3.366 • 10mA≤I
OUT
≤3A, 4.3V≤V
IN
≤16V
Output Voltage, 5.0V Version 4.950 5.000 5.050 V I
OUT
=10mA
4.900 5.000 5.100 • 10mA≤I
OUT
≤3A, 6.0V≤V
IN
≤16V
All Voltage Versions
Line Regulation 0.06 0.5 % I
OUT
=10mA, (V
OUT
+1V)≤V
IN
≤16V
Load Regulation 0.2 1 %
V
IN
=V
OUT
+ 1V, 10mA≤I
OUT
≤I
FL
(note 2)
ΔV/ΔT 20 100 ppm/˚C
• V
OUT
Temp Coefficient (note 6)
Dropout Voltage
Except 1.8V Version (note 3)
120 300
mV
• I
OUT
=100mA
380 I
OUT
=1.5A
600 800 • I
OUT
=3A
Ground Current (note 5) 30 60 mA • I
OUT
=1.5A
40 I
OUT
=3A
Ground Pin Current at Dropout 0.9 mA
V
IN
= 0.5V less than specified V
OUT
I
OUT
=10mA
Current Limit 3.0 4.5 A
V
OUT
=0V (note 4)
Output Noise Voltage 400
µV
RMS
10Hz-100KHz, I
OUT
=100mA, C
OUT
=10µF
260 10Hz-100KHz, I
OUT
=100mA, C
OUT
=33µF
Reference Voltage
Temperature Coefficient 20 ppm/˚C
Note 7
Reference Voltage and Adjustable Pin - SPX29302
Reference Voltage
1.228 1.24 1.252
V
1.215 1.265 •
1.203 1.277 V
REF
≤V
OUT
≤(V
IN
-1), 2.3V≤V
IN
≤16V
10mA≤I
L
≤I
FL
, T
J
<T
JMAX
Adjust Pin Bias Current 40 80 nA
120 •
Adjust Pin Bias Current
Temperature Coefficient 0.1 nA/˚C
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© 2010 Exar Corporation 3/10 Rev. 2.1.0
Parameter Min. Typ. Max. Units Conditions
Power Good Flag Output – SPX29301
Output Leakage Current 0.01 1 µA V
OH
=16V
2 •
Output Low Voltage 220 300 mV Device set for 5V, V
IN
=4.5V, I
OL
=250µA
400 •
Upper Threshold Voltage 40 60 mV Device set for 5V, Note 8
25 •
Lower Threshold Voltage 75 95 mV Device set for 5V, Note 8
140 •
Hysteresis 15 mV
Device set for 5V, Note 8
Enable Input – SPX29301/02
Input Logic Voltage Low (OFF) 0.8
V • V
IN
<10V
Input Logic Voltage High (ON) 2.4 •
Enable Input Pin
100 600
µA
V
EN
=16V
750 •
1 • V
EN
=0.8V
2 •
Regulator Output Current in
Shutdown 10 500 µA
• Note 9
Note 2: Full load current (I
FL
) is defined as 3.0A.
Note 3: Dropout voltage is defined (V
IN
-V
OUT
) when the output voltage drops to 99% of its nominal value.
Note 4: V
IN
=V
OUT
(nom)+1V. Use pulse-testing procedures to minimize temperature rise.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the
load current to the ground current.
Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature
range
Note 7: Thermal regulation is defined as the change in output voltage at time T after a change in power dissipation is
applied, excluding load/line regulation effects. Specifications for a 200mA load pulse as V
IN
=20V (a 4W pulse) for t=10ms.
Note 8: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal
reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error
amplifier gain = V
OUT
/V
REF
= (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is
guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 383mV. Threshold remain constant as a percent of
V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 9: V
EN
≤ 0.8V and V
IN
≤ 16V, V
OUT
= 0.
BLOCK DIAGRAM
Fig. 2: SPX29300/01/02 Block Diagram
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© 2010 Exar Corporation 4/10 Rev. 2.1.0
PIN ASSIGNMENT
Fig. 3: SPX29300/01/02 Pin Assignment
ORDERING INFORMATION
Part Number
Junction
Temperature
Range
Marking Package Packing
Quantity Note 1 Note 2
SPX29300T-L-1-8 -40°C≤T
J
≤+125°C SPX29300T
18YYWWLX
3-pin
TO263 Bulk Lead Free
SPX29300T-L-1-8/TR -40°C≤T
J
≤+125°C SPX29300T
18YYWWLX
3-pin
TO263 500/Tape & Reel Lead Free
SPX29300T-L-2-5 -40°C≤T
J
≤+125°C SPX29300T
25YYWWLX
3-pin
TO263 Bulk Lead Free
SPX29300T-L-2-5/TR -40°C≤T
J
≤+125°C SPX29300T
25YYWWLX
3-pin
TO263 500/Tape & Reel Lead Free
SPX29300T-L-3-3 -40°C≤T
J
≤+125°C SPX29300T
33YYWWLX
3-pin
TO263 Bulk Lead Free
SPX29300T-L-3-3/TR -40°C≤T
J
≤+125°C SPX29300T
33YYWWLX
3-pin
TO263 500/Tape & Reel Lead Free
SPX29300T-L-5-0 -40°C≤T
J
≤+125°C SPX29300T
50YYWWLX
3-pin
TO263 Bulk Lead Free
SPX29300T-L-5-0/TR -40°C≤T
J
≤+125°C SPX29300T
50YYWWLX
3-pin
TO263 500/Tape & Reel Lead Free
SPX29301T5-L-3-3 -40°C≤T
J
≤+125°C 293001T5
33YYWWLX
5-pin
TO263 Bulk Lead Free
SPX29301T5-L-3-3/TR -40°C≤T
J
≤+125°C 293001T5
33YYWWLX
5-pin
TO263 500/Tape & Reel Lead Free
SPX29301T5-L-5-0 -40°C≤T
J
≤+125°C 293001T5
50YYWWLX
5-pin
TO263 Bulk Lead Free
SPX29301T5-L-5-0/TR -40°C≤T
J
≤+125°C 293001T5
50YYWWLX
5-pin
TO263 500/Tape & Reel Lead Free
SPX29302T5-L -40°C≤T
J
≤+125°C 29302T5
YYWWLX
5-pin
TO263 Bulk Lead Free
SPX29302T5-L/TR -40°C≤T
J
≤+125°C 29302T5
YYWWLX
5-pin
TO263 500/Tape & Reel Lead Free
SPX29302U5-L -40°C≤T
J
≤+125°C 29302U5
YYWWLX
5-pin
TO220 Bulk Lead Free
“YY” = Year – “WW” = Work Week – “L” = Lead Free Designator – “X” = Lot Number
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© 2010 Exar Corporation 5/10 Rev. 2.1.0
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at V
IN
= V
OUT
+ 1V, T
J
= T
A
= 25°C, unless otherwise specified.
Fig. 4: Dropout Voltage vs Load Current
Fig. 5: Startup
Fig. 6: Line Regulation
I
OUT
=10mA, V
OUT
=3.3V
Fig. 7: Load Regulation
V
OUT
=3.3V
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© 2010 Exar Corporation 6/10 Rev. 2.1.0
THEORY OF OPERATION
The SPX29300/01/02 incorporates protection
against over-current faults, reversed load
insertion, over temperature operation, and
positive and negative transient voltage.
THERMAL CONSIDERATIONS
Although the SPX29300/01/02 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.
TO-220 DESIGN EXAMPLE:
Assume that V
IN
= 10V, V
OUT
= 5V,
I
OUT
= 1.5A, T
A
= 50°C, θ
HA
= 1°C/W, θ
CH
=
2°C/W, and θ
JC
= 3C°/W, where:
T
A
= ambient temperature,
θ
HA
= heatsink to ambient thermal resistance
θ
CH
= case to heatsink thermal resistance
θ
JC
= junction to case thermal resistance
The power calculated under these conditions
is:
󰇛



󰇜

7.5
And the junction temperature is calculated as








or
507.5󰇛123󰇜 95°
Reliable operation is insured.Capacitor
Requirements
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 aluminum
capacitor will guarantee stability over all load
conditions.
A tantalum capacitor is recommended if a
faster load transient response is needed. If the
power source has high AC impedance, a 0.1μF
ceramic capacitor between input & ground is
recommended.
MINIMUM LOAD CURRENT
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
SPX29300/01/02 is required.
ADJUSTABLE REGULATOR DESIGN
The SPX29300/01/02 is an adjustable
regulator that can be programmed to any
value between 1.25V and 16V using 2 external
resistors, R1 and R2. The relationship between
the resistors and the output voltage is:



1.2401
ERROR FLAG
The SPX29301 features an error flag that
indicates either an over current or under
current voltage condition. The flag output goes
low, sinking 10mA when either conditions
occurs.
ENABLE INPUT
The SPX29301/02 has an Enable function that
switches the regulator on and off. Their
thresholds are TTL compatible. When the
regulator is active, approximately 20µA flows
through the Enable pin.
TYPICAL APPLICATION CIRCUITS
Figure 1 represents the typical implementation
for an adjustable output regulator. The values
of R1 and R2 set the output voltage value as
follows:



1
A minimum value of 10kohms is recommended
for R2 with a range between 10kΩ and 47kΩ.
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© 2010 Exar Corporation 7/10 Rev. 2.1.0
PACKAGE SPECIFICATION
3-PIN TO-263
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© 2010 Exar Corporation 8/10 Rev. 2.1.0
5-PIN TO-263
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© 2010 Exar Corporation 9/10 Rev. 2.1.0
5-PIN TO-220
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© 2010 Exar Corporation 10/10 Rev. 2.1.0
REVISION HISTORY
Revision Date Description
1.0.0 12/17/2009 Initial Release of Datasheet
2.0.0 03/31/2010
Reformat of datasheet
Inserted ESD data
Modified Dropout Voltage and Ground Current values in electrical characteristics table
Corrected typographical error in result of calculus in note 8
Removed “Gound Current vs Load Current”, “Enable Threshold vs Temperature” and
“Power Supply Rejection Ratio curves”
Updated “Dropout Voltage vs Load Current”, “Line Regulation” and “Load Regulation”
curves
Added “start Up” curve
2.1.0 10/19/2010 Corrected Adjustable Regulator Design paragraph equation
FOR FURTHER ASSISTANCE
Email: customersupport@exar.com
Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx?
E
XAR CORPORATION
HEADQUARTERS AND SALES OFFICES
48720 Kato Road
Fremont, CA 94538 – USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve
design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,
conveys no license under any patent or other right, and makes no representation that the circuits are free of patent
infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a
user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,
is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its
safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in
writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all
such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.