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August 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 SPX1117 is a low power positive-voltage
regulator designed to satisfy moderate power
requirements with a cost effective, small
footprint solution.
This device is an excellent choice for use in
battery-powered applications and portable
computers. The SPX1117 features very low
quiescent current and a low dropout voltage of
1.1V at a full load. As output current
decreases, quiescent current flows into the
load, increasing efficiency. SPX1117 is
available in adjustable or fixed 1.5V, 1.8V,
2.5V, 3.3V and 5V output voltages.
The SPX1117 is offered in 3-pin SOT-223 and
TO-263 surface mount packages.
An output capacitor of 10µF provides
unconditional stability while a smaller 2.2µF
capacitor is sufficient for most applications.
APPLICATIONS
Desktop PC Servers
Graphic/Video Cards
Industrial Equipments
Power Supplies
FEATURES
Guaranteed 800mA Output Current
Guaranteed 1A Peak Current
Three Terminal Adjustable or Fixed
1.5V, 1.8V, 2.5V, 3.3V and 5V
Low Quiescent Current
Low Dropout Voltage of 1.1V at 800mA
0.1% Line and 0.2% Load Regulation
Stable with 2.2µF Ceramic Capacitor
Overcurrent and Thermal Protection
Lead Free, RoHS Compliant Packages
SOT223 and TO263
FUNCTIONAL DIAGRAM
Fig. 1: SPX1117 Application Diagram
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© 2011 Exar Corporation 2/11 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.
Power Dissipation ................................ Internally Limited
Lead Temperature (Soldering, 5 sec) ..................... 260°C
Storage Temperature .............................. -65°C to 150°C
Operating Junction Temperature Range ... -40°C to +125°C
Input Supply Voltage .............................................. 20V
Input to Output Voltage ........................................ 18.8V
ESD Rating (HBM - Human Body Model) .................... 2kV
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Ambient Temperature of 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, C
IN
= C
OUT
=10µF, T
A
= 25°C.
Parameter Min. Typ. Max. Units Conditions
1.5V Version
Output Voltage 1.485 1.500 1.515 V I
OUT
=5mA, V
IN
=3.0V, T
J
=25°C
1.470 1.530 • 5mA≤ I
OUT
≤800mA, 2.9V≤ V
IN
≤10V
1.8V Version
Output Voltage 1.782 1.800 1.818 V I
OUT
=5mA, V
IN
=3.3V, T
J
=25°C
1.764 1.836 • 5mA≤ I
OUT
≤800mA, 3.2V≤ V
IN
≤10V
2.5V Version
Output Voltage 2.475 2.500 2.525 V I
OUT
=5mA, V
IN
=4.0V, T
J
=25°C
2.450 2.550 • 5mA≤ I
OUT
≤800mA, 3.9V≤ V
IN
≤10V
3.3V Version
Output Voltage 3.267 3.300 3.333 V I
OUT
=5mA, V
IN
=4.8V, T
J
=25°C
3.234 3.366 •
5.0V Version
Output Voltage 4.950 5.000 5.050 V I
OUT
=5mA, V
IN
=6.5V, T
J
=25°C
4.900 5.100 • 5mA≤ I
OUT
≤800mA, 6.4V≤ V
IN
≤12V
All Voltage Options
Reference Voltage 1.238 1.250 1.262 V I
OUT
=5mA, (V
IN
– V
OUT
)=2V, T
J
=25°C
1.225 1.270 • 5mA≤I
OUT
≤800mA, 1.4V≤(V
IN
–V
OUT
)≤10V
Output Voltage Temperature
Stability 0.3 %
Line Regulation (note 1) 3 7 mV
V
INMIN
≤ V
IN
≤12V, V
OUT
= Fixed/Adj.,
I
OUT
=5mA
Load Regulation (note 1) 6 12 mV
• 5mA≤ I
OUT
≤800mA, V
OUT
= Fixed/Adj.
Dropout Voltage (note 2)
1.00 1.20
V
• I
OUT
=100mA
1.05 1.25 • I
OUT
=500mA
1.10 1.30 • I
OUT
=800mA
Quiescent Current 5 10 mA
• 4.25V≤ V
IN
≤6.5V
Adjust Pin Current 50 120 µA
•
Current Limit 1.0 1.5 2.0 A (V
IN
– V
OUT
)=5V
Thermal Regulation 0.01 0.1 %/W
25°C, 30ms pulse
Ripple Rejection 60 75 dB
f
RIPPLE
=120Hz, (V
IN
– V
OUT
)=2V,
V
RIPPLE
=1V
PP
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© 2011 Exar Corporation 3/11 Rev. 2.1.0
Parameter Min. Typ. Max. Units Conditions
Long Term Stability 0.03 %
125°C, 1000Hrs
RMS Output Noise 0.003 %
% of V
OUT
, 10Hz≤f≤10kHz
Note 1:
For fixed voltage option V
INMIN
=V
OUT
+1.5V
For adjustable voltage option V
IN
-V
OUT
=1.4V
Note 2: Dropout voltage is the input voltage minus output voltage that produces a 1% decrease in output voltage with
respect to the nominal output voltage at V
IN
=V
OUT
+1.5V
PIN ASSIGNMENT
Fig. 2: SPX1117 Pin Assignment (Top View, TAB connected to V
OUT
)
ORDERING INFORMATION
Part Number Temperature
Range Marking Package Packing
Quantity Note 1 Note 2
SPX1117M3-L -40°C≤T
J
≤+125°C 1117M3
YYWWL SOT223-3 78/Tube Lead Free
SPX1117M3-L/TR 2.5K/Tape & Reel
SPX1117M3-L-1-5 -40°C≤T
J
≤+125°C 1117M3
15YYWWL SOT223-3 78/Tube Lead Free
SPX1117M3-L-1-5/TR 2.5K/Tape & Reel
SPX1117M3-L-1-8 -40°C≤T
J
≤+125°C 1117M3
18YYWWL SOT223-3 78/Tube Lead Free
SPX1117M3-L-1-8/TR 2.5K/Tape & Reel
SPX1117M3-L-2-5 -40°C≤T
J
≤+125°C 1117M3
25YYWWL SOT223-3 78/Tube Lead Free
SPX1117M3-L-2-5/TR 2.5K/Tape & Reel
SPX1117M3-L-3-3 -40°C≤T
J
≤+125°C 1117M3
33YYWWL SOT223-3 78/Tube Lead Free
SPX1117M3-L-3-3/TR 2.5K/Tape & Reel
SPX1117M3-L-5-0 -40°C≤T
J
≤+125°C 1117M3
50YYWWL SOT223-3 78/Tube Lead Free
SPX1117M3-L-5-0/TR 2.5K/Tape & Reel
SPX1117T-L -40°C≤T
J
≤+125°C SPX1117T
YYWWLX TO-263-3 50/Tube Lead Free
SPX1117T-L/TR 500/Tape & Reel
SPX1117T-L-3-3 -40°C≤T
J
≤+125°C SPX1117T
33YYWWLX TO-263-3 50/Tube Lead Free
SPX1117T-L-3-3/TR 500/Tape & Reel
“YY” = Year – “WW” = Work Week – “L” = Lead Free Indicator - “X” = Lot Number
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© 2011 Exar Corporation 4/11 Rev. 2.1.0
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at T
A
= 25°C, unless otherwise specified - Schematic and BOM from Application Information section of this
datasheet.
Fig. 3: Load Regulation
SPX1117M3-L-3-3, V
IN
=4.8V
Fig. 4: Line Regulation
SPX1117M3-L-3-3, I
OUT
=10mA
Fig. 5: Dropout Voltage vs Output Current
SPX1117M3-L-3-3, V
IN
=4.8V, C
OUT
=2.2µF
Fig. 6: Current Limit
I
OUT
pulsed from 10mA to Current limit
SPX1117M3-L-3-3, V
IN
=4.8V, C
IN
=C
OUT
=2.2µF
Fig. 7: Current Limit
Output Voltage Deviation
SPX1117M3-L-3-3, I
OUT
=10mA to 1A Step
Fig. 8: V
OUT
vs Temperature
V
IN
=2.5V, I
OUT
=10mA
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© 2011 Exar Corporation 5/11 Rev. 2.1.0
Fig. 9: V
IN
=3.0V, I
OUT
=10mA
Fig. 10: V
IN
=3.3V, I
OUT
=10mA
Fig. 11: V
IN
=4.0V, I
OUT
=10mA
Fig. 12: V
IN
=4.85V, I
OUT
=10mA
Fig. 13: Line Regulation vs Temperature
V
OUT
=1.8V (Adj), V
IN
=3.3V
Fig. 14: Output Voltage vs Temperature
Different I
OUT
, V
OUT
=1.8V (Adj), V
IN
=3.3V
Fig. 15: Line Regulation over Temperature
I
LOAD
=800mA, V
OUT
=1.8V(adj)
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© 2011 Exar Corporation 6/11 Rev. 2.1.0
APPLICATION INFORMATION
OUTPUT CAPACITOR
To ensure the stability of the SPX1117, an
output capacitor of at least 2.2µF (tantalum or
ceramic) or 10µF (aluminum) is required. The
value may change based on the application
requirements of the output load or
temperature range. The value of ESR can vary
based on the type of capacitor used in the
applications to guarantee stability. The
recommended value for ESR is 0.5Ωor less. A
larger value of output capacitance (up to
100µF) can improve the load transient
response.
Fig. 16: Load Step Response 0mA to 800mA
V
IN
=3.3V, V
OUT
=1.8V, C
IN
=10µF, C
OUT
=2.2µF, Ceramic
Signal 1=V
OUT
, Signal 4=I
LOAD
Fig. 17: Load Step Response 0mA to 800mA
V
IN
=3.3V, V
OUT
=1.8V, C
IN
=10µF, C
OUT
=2.2µF, OSCON
Signal 1=V
OUT
, Signal 4=I
LOAD
Fig. 18
S
OLDERING METHODS
The SPX1117 SOT-223 package is designed to
be compatible with infrared reflow or vapor-
phase reflow soldering techniques. During
soldering, the non-active or mildly active
fluxes may be used. The SPX1117 die is
attached to the heatsink lead which exits
opposite the input, output, and ground pins.
Hand soldering and wave soldering should be
avoided since these methods can cause
damage to the device with excessive thermal
gradients on the package. The SOT-223
recommended soldering method are as
follows: vapor phase reflow and infrared
reflow with the component preheated to within
65C of the soldering temperature range.
THERMAL CHARACTERISTICS
The thermal resistance of SPX1117 (SOT-223
package) is 15°C/W from junction to tab and
31°C/W from tab to ambient for a total of 46
°C/W from junction to ambient (Table 1). The
SPX1117 features the internal thermal limiting
to protect the device during overload
conditions. Special care needs to be taken
during continuous load conditions such that
the maximum junction temperature does not
exceed 125 °C. Thermal protection is activated
at >155°C and deactivated at <140 °C.
Taking the FR-4 printed circuit board and 1/16
thick with 1 ounce copper foil as an
experiment (fig.19), the PCB material is
effective at transmitting heat with the tab
attached to the pad area and a ground plane
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© 2011 Exar Corporation 7/11 Rev. 2.1.0
layer on the backside of the substrate. Refer
to table 1 for the results of the experiment.
The thermal interaction from other
components in the application can affect the
thermal resistance of the SPX1117. The actual
thermal resistance can be determined with
experimentation.
SPX1117 power dissipation is calculated as
follows:
Maximum Junction Temperature
.
Maximum junction temperature must not
exceed 125°C.
Fig. 19: Substrate Layout for SOT-223
R
IPPLE REJECTION
Ripple rejection can be improved by adding a
capacitor between the ADJ pin and ground as
shown in Figure 23. When ADJ pin bypassing
is used, the value of the output capacitor
required increases to its maximum. If the ADJ
pin is not bypassed, the value of the output
capacitor can be lowered to 10μF for an
electrolytic aluminum capacitor or 2.2μF for a
ceramic or solid tantalum capacitor (Fig 22).
However the value of the ADJ-bypass
capacitor should be chosen with respect to the
following equation:
1
6.28
Where
C: value of capacitor in Farads
F
R
: ripple frequency in Hz
R1: value of resistor R1 in ohms
If an ADJ-bypass capacitor is used, 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:
Where M=multiplier for the ripple seen when
the ADJ pin is optimally bypassed.
V
REF
=1.25V
Ripple rejection for the adjustable version is
shown in Figure 20.
Fig. 20: Ripple Rejection
V
IN
=3.3V, V
OUT
=1.8V(adj), I
LOAD
=200mA
O
UTPUT VOLTAGE
The output of the adjustable regulator can be
set to any voltage between 1.25V and 15V.
The value of V
OUT
can be quickly approximated
using the formula
1.25
A small correction to this formula is required
depending on the values of resistors R1 and
R2, since the adjustable pin current (approx
50μA) flows through R2. When IADJ is taken
into account, the formula becomes
Where V
REF
=1.25V
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© 2011 Exar Corporation 8/11 Rev. 2.1.0
PRE-BIAS OUTPUT VOLTAGE START-UP
The SPX1117 is not intended for operations
requiring start-up into a pre-biased load.
Proper discharge of the output voltage is
recommended prior of turning on the device
through the application of the input voltage.
LAYOUT CONSIDERATIONS
Parasitic line resistance can degrade local
regulation. In order to avoid this, connect R
1
directly to V
OUT
as illustrated in figure 25. For
the same reason R
2
should be connected to
the negative side of the load.
Fig. 21: Current Cource
Fig. 22:Typical Adjustable Regulator
Fig. 23: Improving Ripple Rejection
Fig. 24: 5V Regulator with Shutdown
Fig. 25: Recommended Connections for Best Results
PC Board
mm
2
Topside
Copper
mm
2
Backside
Copper
mm
2
Thermal
Resistance
Jct to amb.
°C/W
2500 2500 2500 46
2500 1250 2500 47
2500 950 2500 49
2500 2500 0 51
2500 1800 0 53
1600 600 1600 55
2500 1250 0 58
2500 915 0 59
1600 600 0 67
900 240 900 72
900 240 0 85
Table 1
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© 2011 Exar Corporation 9/11 Rev. 2.1.0
PACKAGE SPECIFICATION
3-PIN SOT-223
S
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© 2011 Exar Corporation 10/11 Rev. 2.1.0
3-PIN TO-263
S
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© 2011 Exar Corporation 11/11 Rev. 2.1.0
REVISION HISTORY
Revision Date Description
2.0.0 06/23/2010 Reformat of Datasheet
2.1.0 08/24/2011 Addition of the Pre-Bias Output Voltage Start-up section
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.
