S P X1 1 1 7
800mA Low Dropout Voltage Regulator
August 2010
Rev. 2.1.0
GENERAL DESCRIPTION
APPLICATIONS
The SPX1117 is a low power positive-voltage
regulator designed to satisfy moderate power
requirements with a cost effective, small
footprint solution.
Desktop PC Servers
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.
Power Supplies
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.
Graphic/Video Cards
Industrial Equipments
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
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
S P X1 1 1 7
800mA Low Dropout Voltage Regulator
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 TA = 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 TJ = 25°C, and are provided for
reference purposes only. Unless otherwise indicated, CIN = COUT =10µF, TA= 25°C.
Parameter
Min.
Typ.
1.485
1.500
Max.
Units
Conditions
1.5V Version
Output Voltage
1.515
1.530
1.470
V
IOUT=5mA, VIN=3.0V, TJ=25°C
•
5mA≤ IOUT ≤800mA, 2.9V≤ VIN ≤10V
•
5mA≤ IOUT ≤800mA, 3.2V≤ VIN ≤10V
•
5mA≤ IOUT ≤800mA, 3.9V≤ VIN ≤10V
1.8V Version
Output Voltage
1.782
1.800
1.818
1.836
1.764
V
IOUT=5mA, VIN=3.3V, TJ=25°C
2.5V Version
Output Voltage
2.475
2.500
2.525
2.550
2.450
V
IOUT=5mA, VIN=4.0V, TJ=25°C
3.3V Version
Output Voltage
3.267
3.300
3.333
3.366
3.234
V
IOUT=5mA, VIN=4.8V, TJ=25°C
•
5.0V Version
Output Voltage
4.950
5.000
5.050
5.100
4.900
V
IOUT=5mA, VIN=6.5V, TJ=25°C
•
5mA≤ IOUT ≤800mA, 6.4V≤ VIN ≤12V
•
5mA≤IOUT≤800mA, 1.4V≤(VIN–VOUT)≤10V
All Voltage Options
Reference Voltage
1.238
1.250
Output Voltage Temperature
Stability
1.262
1.270
1.225
0.3
Line Regulation (note 1)
3
Load Regulation (note 1)
7
mV
mV
6
12
1.20
1.05
1.25
1.10
1.30
Quiescent Current
5
10
Adjust Pin Current
50
120
Current Limit
1.0
Thermal Regulation
Ripple Rejection
© 2011 Exar Corporation
60
IOUT=5mA, (VIN – VOUT)=2V, TJ=25°C
%
1.00
Dropout Voltage (note 2)
V
•
5mA≤ IOUT ≤800mA, VOUT = Fixed/Adj.
•
IOUT=100mA
•
IOUT=500mA
•
IOUT=800mA
mA
•
4.25V≤ VIN ≤6.5V
µA
•
V
1.5
2.0
A
0.01
0.1
%/W
75
dB
2/11
VINMIN≤ VIN ≤12V, VOUT = Fixed/Adj.,
IOUT=5mA
(VIN – VOUT)=5V
25°C, 30ms pulse
fRIPPLE=120Hz, (VIN – VOUT)=2V,
VRIPPLE=1VPP
Rev. 2.1.0
S P X1 1 1 7
800mA Low Dropout Voltage Regulator
Parameter
Min.
Long Term Stability
RMS Output Noise
Typ.
Max.
Units
Conditions
0.03
%
125°C, 1000Hrs
0.003
%
% of VOUT, 10Hz≤f≤10kHz
Note 1:
For fixed voltage option VINMIN=VOUT+1.5V
For adjustable 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
respect to the nominal output voltage at VIN=VOUT+1.5V
PIN ASSIGNMENT
Fig. 2: SPX1117 Pin Assignment (Top View, TAB connected to VOUT)
ORDERING INFORMATION
Part Number
SPX1117M3-L
SPX1117M3-L/TR
SPX1117M3-L-1-5
SPX1117M3-L-1-5/TR
SPX1117M3-L-1-8
SPX1117M3-L-1-8/TR
SPX1117M3-L-2-5
SPX1117M3-L-2-5/TR
SPX1117M3-L-3-3
SPX1117M3-L-3-3/TR
SPX1117M3-L-5-0
SPX1117M3-L-5-0/TR
SPX1117T-L
SPX1117T-L/TR
SPX1117T-L-3-3
SPX1117T-L-3-3/TR
Temperature
Range
Marking
Package
-40°C≤TJ≤+125°C
1117M3
YYWWL
SOT223-3
-40°C≤TJ≤+125°C
1117M3
15YYWWL
SOT223-3
-40°C≤TJ≤+125°C
1117M3
18YYWWL
SOT223-3
-40°C≤TJ≤+125°C
1117M3
25YYWWL
SOT223-3
-40°C≤TJ≤+125°C
1117M3
33YYWWL
SOT223-3
-40°C≤TJ≤+125°C
1117M3
50YYWWL
SOT223-3
-40°C≤TJ≤+125°C
SPX1117T
YYWWLX
TO-263-3
-40°C≤TJ≤+125°C
SPX1117T
33YYWWLX
TO-263-3
Packing
Quantity
78/Tube
2.5K/Tape & Reel
78/Tube
2.5K/Tape & Reel
78/Tube
2.5K/Tape & Reel
78/Tube
2.5K/Tape & Reel
78/Tube
2.5K/Tape & Reel
78/Tube
2.5K/Tape & Reel
50/Tube
500/Tape & Reel
50/Tube
500/Tape & Reel
Note 1
Note 2
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
Lead Free
“YY” = Year – “WW” = Work Week – “L” = Lead Free Indicator - “X” = Lot Number
© 2011 Exar Corporation
3/11
Rev. 2.1.0
S P X1 1 1 7
800mA Low Dropout Voltage Regulator
TYPICAL PERFORMANCE 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 pulsed from 10mA to Current limit
SPX1117M3-L-3-3, VIN=4.8V, CIN=COUT=2.2µF
Fig. 7: Current Limit
Output Voltage Deviation
SPX1117M3-L-3-3, IOUT=10mA to 1A Step
Fig. 8: VOUT vs Temperature
VIN=2.5V, IOUT=10mA
© 2011 Exar Corporation
4/11
Rev. 2.1.0
S P X1 1 1 7
800mA Low Dropout Voltage Regulator
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=800mA, VOUT=1.8V(adj)
© 2011 Exar Corporation
5/11
Rev. 2.1.0
S P X1 1 1 7
800mA Low Dropout Voltage Regulator
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. 18
SOLDERING METHODS
The SPX1117 SOT-223 package is designed to
be compatible with infrared reflow or vaporphase 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.
Fig. 16: Load Step Response 0mA to 800mA
VIN=3.3V, VOUT=1.8V, CIN=10µF, COUT=2.2µF, Ceramic
Signal 1=VOUT, Signal 4=ILOAD
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
