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September 2018
Rev. 2.1.1
1/11 Rev. 2.1.1
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 a 3-pin SOT-223
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 an d 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 SOT223
Package
FUNCTIONAL DIAGRAM
Fig. 1: SPX1117 Application Diagram
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2/11 Rev. 2. 1.1
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 ................................ Inter na lly Limite d
Lead Tempera tur e (Soldering , 5 sec) ..................... 260°C
Stor age Temperature .............................. -65°C to 150°C
Operating Junc tion Temperature Range ... -40°C to +125°C
Input Supply Voltage .............................................. 20V
Input to Output Vol tag e ........................................ 18.8V
ESD Rating (HBM - Human Body Model) .................... 2kV
ELECTRICAL SPECIFICATIONS
Spec ifications wi th standard type ar e for an Operating Ambient Temp eratur e o f TA = 25°C only ; limits apply ing over the full
Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or stati s tic al c or relation. Typ ic al values re pr ese nt the most likely parame tric nor m at TJ = 25°C, and are provided for
referenc e purposes only. Unless otherwise indicated, CIN = COUT =10µF, TA= 25°C.
Parameter Min. Typ. Max. Units Conditions
1.5V Version
Output Voltag e
1.485
1.500
1.515
V
I
OUT
=5mA, V
IN
=3.0V, T
J
=25°C
1.470
1.530
•
5mA≤ IOUT ≤800mA, 2.9V≤ VIN ≤10V
1.8V Version
Output Voltag e
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 Voltag e
2.475
2.500
2.525
V
IOUT=5mA, VIN=4.0V, TJ=25°C
2.450
2.550
•
5mA≤ IOUT ≤800mA, 3.9V≤ VIN ≤10V
3.3V Version
Output Voltag e
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 Voltag e
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
IOUT=5mA, (VIN – VOUT)=2V, TJ=25°C
1.225
1.270
•
5mA≤IOUT≤800mA, 1.4V≤(VIN–VOUT)≤10V
Output Voltag e Temp er ature
Stability
0.3 %
Line Regulatio n (note 1) 3 7 mV
V
INMIN
≤ V
IN
≤12V, V
OUT
= Fixed/Adj.,
IOUT=5mA
Load Regulation (note 1)
6
12
mV
•
5mA≤ I
OUT
≤800mA, V
OUT
= Fixed/Adj.
Dropout Volta g e (note 2)
1.00 1.20 V
•
I
OUT
=100mA
1.05
1.25
•
I
OUT
=500mA
1.10
1.30
•
IOUT=800mA
Quiescent Current
5
10
mA
•
4.25V≤ VIN ≤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, 30m s pulse
Ripp le Reje c tion 60 75 dB
f
RIPPLE
=120Hz , (V
IN
– V
OUT
)=2V,
V
RIPPLE
=1V
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3/11 Rev. 2. 1.1
Parameter Min. Typ. Max. Units Conditions
Long Term Stab ility
0.03
%
125°C, 1000Hrs
RMS Output Noise
0.003
%
% of V
OUT
, 10Hz≤f≤10kHz
Note 1:
For fixed voltage option VINMIN=VOUT+1.5V
For adjusta b le voltage option VIN-VOUT=1.4V
Note 2: Dropout voltage is the input voltage minus output voltage that produces a 1% decrease in output voltage with
respec t to the nomina l o utp ut vo lta g e at VIN=VOUT+1.5V
PIN ASSIGNMENT
Fig. 2: SPX1117 Pin Ass ignment (Top View, TAB co nnecte d to VOUT)
ORDERING INFORMATION(1)
Part Number Operating
Temperature Range Lead-Free Package Packing Me thod Output Volta ge
SPX1117M3-L/TR
-40°C≤TJ≤+125°C Yes(2) SOT223-3 Tape & Reel
Adjustable
SPX1117M3-L-1-5/TR 1.5V
SPX1117M3-L-1-8/TR 1.8V
SPX1117M3-L-2-5/TR 2.5V
SPX1117M3-L-3-3/TR 3.3V
SPX1117M3-L-5-0/TR 5.0V
NOTE:
1. Refer to www.exar.com/SPX1117 for mos t u p-to-date Ordering Information.
2. Visit www.exar.com for additional inform ation on Environmental Ra ting .
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4/11 Rev. 2. 1.1
TYPICA L P ERFORMANCE CHARACTERISTICS
All data taken at TA = 25°C, unless otherwise specified - Schematic and BOM from Application Information section of this
datasheet.
Fig. 3: Load Regulation
SPX1117M3-L-3-3, VIN=4.8V
Fig. 4: Line Regulation
SPX1117M3-L-3-3, IOUT=10mA
Fig. 5: Dropout Voltage vs Output Current
SPX1117M3-L-3-3, VIN=4.8V, COUT=2.2µF
Fig. 6: Current Limit
IOUT p uls ed fro m 10mA to Current limit
SPX1117M3-L-3-3, VIN=4.8V, CIN=COUT=2.2µF
Fig. 7: Curre nt Limit
Output Voltage Deviation
SPX1117M3-L-3-3, IOUT=10mA to 1A Step
Fig. 8: VOUT vs Temperature
VIN=2.5V, IOUT=10mA
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5/11 Rev. 2. 1.1
Fig. 9: VIN=3.0V, IOUT=10mA
Fig. 10: VIN= 3.3V, IOUT=10mA
Fig. 11: VIN= 4.0V , IOUT=10mA
Fig. 12: VIN=4.85V, IOUT=10mA
Fig. 13: Line Regulation vs Temperature
VOUT=1.8V (Adj), VIN=3.3V
Fig. 14: Output Voltage vs Temperature
Different IOUT, VOUT=1.8V (Adj), VIN=3.3V
Fig. 15: Line Regulation over Temperature
ILOAD=800m A , VOUT=1.8V(adj)
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6/11 Rev. 2. 1.1
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 rang e. 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 0.5Ω or less. A
larger value of output capacitance (up to
100µF) can improve the load transient
response.
Fig. 16: Load Step Response 0mA to 800mA
VIN=3.3V, VOUT=1.8V, CIN=10 µF, COUT=2.2µF, Ceramic
Signal 1=V OUT, Signal 4=ILOAD
Fig. 17: Load Step Response 0mA to 800mA
VIN=3.3V, VOUT=1.8V, CIN=10 µF, COUT=2.2µF, OSCON
Signal 1=V OUT, Signal 4=ILOAD
Fig. 18
SOLDERING 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
65°C 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 activate d
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
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7/11 Rev. 2. 1.1
attached to the pad area and a ground plane
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
=
()+
×ℎ  (  . )
Maximum junction temperature must not
exceed 125°C.
Fig. 19: Substrate Layout for SOT-223
RIPPLE 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 wi th respect to the
following equation:
=1
6.28 ××1
Where
C: value of capacitor in Farads
FR: 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 re ference voltage:
=


Where M=multiplier for the ripple seen when
the ADJ pin is optimally bypassed.
VREF=1.25V
Ripple rejection for the adjustable version is
shown in Figure 20.
Fig. 20: Ripple Rejection
VIN=3.3V, VOUT=1.8V(adj), ILOAD=200mA
OUTPUT VOLTAGE
The output of the adjustable regulator can be
set to any voltage between 1.25V and 15V.
The val ue of VOUT can be quickly approximated
using the f ormula
 = 1.25 ×1+2
1
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
 =
×1+2
1
+
 ×2
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8/11 Rev. 2. 1.1
Whe re VREF=1.25V
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 R1
directly to VOUT as illustrated in figure 25. For
the same reason R2 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
mm2
Topside
Copper
mm2
Backside
Copper
mm2
Thermal
Resistance
Jct to amb.
°C/W
2500
2500
46
2500
2500
47
2500
2500
49
2500
0
51
2500
0
53
1600
1600
55
2500
0
58
2500
0
59
1600
0
67
900
900
72
900
0
85
Table 1
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9/11 Rev. 2. 1.1
MECHANICAL DIMENSIONS
3-PIN SOT-223
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10/11 Rev. 2. 1.1
RECOMM ENDED LAND PATTERN AND STENCIL
3-PIN SOT-223
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11/11 Rev. 2. 1.1
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
2.1.1 09/05/2018
Update to MaxLine ar logo. Update format and Ordering Information. Removed obsolete
TO-263-3.
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