LT1117ISTPBF [Linear]
800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V; 800毫安低压差正稳压器可调和固定2.85V ， 3.3V ， 5V
| 型号： | LT1117ISTPBF |
| 厂家： | 
Linear |
| 描述： | 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V |
| 文件： | 总16页 (文件大小：184K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Positive Regulators Adjustable
and Fixed 2.85V, 3.3V, 5V
FEATURES
DESCRIPTION
The LT®1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
availableinanadjustableversionandfixedoutputvoltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
n
Space Saving SOT-223 Surface Mount Package
n
3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
n
Output Current of 800mA
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
0.2% Line Regulation Max
0.4% Load Regulation Max
n
n
specifically to be used in Active Terminators for the SCSI
bus.Allinternalcircuitryisdesignedtooperatedownto1V
input to output differential. Dropout voltage is guaranteed
at a maximum of 1.2V at 800mA, decreasing at lower load
currents. On chip trimming adjusts the reference/output
voltage to within 1%. Current limit is also trimmed in
order to minimize the stress on both the regulator and the
power source circuitry under overload conditions.
n
n
APPLICATIONS
n
Active SCSI Terminators
n
High Efficiency Linear Regulators
n
Post Regulators for Switching Supplies
Battery Chargers
5V to 3.3V Linear Regulators
ThelowprofilesurfacemountSOT-223packageallowsthe
devicetobeusedinapplicationswherespaceislimited.The
LT1117requiresaminimumof10μFofoutputcapacitance
for stability. Output capacitors of this size or larger are
normally included in most regulator designs.
n
n
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks
of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
Unlike PNP type regulators where up to 10% of the output
currentiswastedasquiescentcurrent,thequiescentcurrent
of the LT1117 flows into the load, increasing efficiency.
TYPICAL APPLICATION
Active Terminator for SCSI-2 Bus
Dropout Voltage (VIN – VOUT)
1.4
1.2
1.0
–40°C ≤ T < 0°C
J
110Ω
110Ω
0°C ≤ T ≤ 125°C
J
LT1117-2.85
110Ω
18 TO 27
LINES
T
= 25°C
J
IN
OUT
0.8
0.6
0.4
0.2
0
GND
T
= 125°C
J
+
+
4.75V TO
5.25V
110Ω
10μF
22μF
1117 TA01
INDICATES GUARANTEED TEST POINT
0
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
1117 TA02
1117fd
1
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage
Operating JunctionTemperature Range
Operating Voltage
C Grade.................................................. 0°C to 125°C
I Grade...............................................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature ....................(See Soldering Methods)
LT1117, LT1117-3.3, LT1117-5.........................15V
LT1117-2.85 .....................................................10V
Surge Voltage
LT1117, LT1117-3.3, LT1117-5.........................20V
PIN CONFIGURATION
FRONT VIEW
FRONT VIEW
3
2
IN
3
2
1
IN
TAB IS
OUT
TAB IS
OUT
OUT
OUT
V
V
ADJ/GND
1
ADJ/GND
ST PACKAGE
M PACKAGE
3-LEAD PLASTIC DD-PAK
= 125°C, θ = 10°C/W
3-LEAD PLASTIC SOT-223
T
= 125°C, θ = 15°C/W
JMAX
JC
T
JMAX
JC
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
1117
PACKAGE DESCRIPTION
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic DD-PAK
3-Lead Plastic DD-PAK
3-Lead Plastic DD-PAK
3-Lead Plastic DD-PAK
TEMPERATURE RANGE
0°C to 125°C
LT1117CST#PBF
LT1117CST#TRPBF
LT1117IST#TRPBF
LT1117IST#PBF
1117I
–40°C to 125°C
0°C to 125°C
LT1117CST-2.85#PBF
LT1117IST-2.85#PBF
LT1117CST-3.3#PBF
LT1117IST-3.3#PBF
LT1117CST-5#PBF
LT1117IST-5#PBF
LT1117CM#PBF
LT1117CST-2.85#TRPBF 11172
LT1117IST-2.85#TRPBF
LT1117CST-3.3#TRPBF
LT1117IST-3.3#TRPBF
LT1117CST-5#TRPBF
LT1117IST-5#TRPBF
LT1117CM#TRPBF
1117I2
–40°C to 125°C
0°C to 125°C
11173
1117I3
–40°C to 125°C
0°C to 125°C
11175
1117I5
–40°C to 125°C
0°C to 125°C
LT1117CM
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5
LT1117CM-2.85#PBF
LT1117CM-3.3#PBF
LT1117CM-5#PBF
LT1117CM-2.85#TRPBF
LT1117CM-3.3#TRPBF
LT1117CM-5#TRPBF
0°C to 125°C
0°C to 125°C
0°C to 125°C
1117fd
2
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
ORDER INFORMATION
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
1117
PACKAGE DESCRIPTION
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic DD-PAK
3-Lead Plastic DD-PAK
3-Lead Plastic DD-PAK
3-Lead Plastic DD-PAK
TEMPERATURE RANGE
0°C to 125°C
LT1117CST
LT1117CST#TR
LT1117IST
LT1117IST#TR
1117I
–40°C to 125°C
0°C to 125°C
LT1117CST-2.85
LT1117IST-2.85
LT1117CST-3.3
LT1117IST-3.3
LT1117CST-5
LT1117IST-5
LT1117CST-2.85#TR
LT1117IST-2.85#TR
LT1117CST-3.3#TR
LT1117IST-3.3#TR
LT1117CST-5#TR
LT1117IST-5#TR
LT1117CM#TR
11172
1117I2
–40°C to 125°C
0°C to 125°C
11173
1117I3
–40°C to 125°C
0°C to 125°C
11175
1117I5
–40°C to 125°C
0°C to 125°C
LT1117CM
LT1117CM
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5
LT1117CM-2.85#TR
LT1117CM-3.3#TR
LT1117CM-5#TR
0°C to 125°C
0°C to 125°C
0°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
CONDITIONS
= 10mA, (V – V ) = 2V, T = 25°C
MIN
TYP
MAX
UNITS
Reference Voltage
LT1117
I
1.238
1.225
1.250
1.250
1.262
1.270
V
V
OUT
IN
OUT
J
l
10mA ≤ I
≤ 800mA, 1.4V ≤ (V – V ) ≤ 10V
OUT
IN OUT
Output Voltage
LT1117-2.85
I
= 10mA, V = 4.85V, T = 25°C
2.820
2.790
2.790
2.850
2.850
2.850
2.880
2.910
2.910
V
V
V
OUT
0 ≤ I
0 ≤ I
IN
J
l
l
≤ 800mA, 4.25V ≤ V ≤ 10V
OUT
OUT
IN
≤ 500mA, V = 3.95V
IN
LT1117-3.3
LT1117-5
I
= 10mA, V = 5V, T = 25°C
3.267
3.235
3.300
3.300
3.333
3.365
V
V
OUT
IN
J
l
0 ≤ I
≤ 800mA, 4.75V ≤ V ≤ 10V
OUT
IN
I
= 10mA, V = 7V, T = 25°C
4.950
4.900
5.000
5.000
5.050
5.100
V
V
OUT
IN
J
l
0 ≤ I
≤ 800mA, 6.5V ≤ V ≤ 12V
OUT
IN
l
l
l
l
Line Regulation
Load Regulation
Dropout Voltage
LT1117
I
I
I
I
= 10mA, 1.5V ≤ V – V ≤ 15V (Note 2)
OUT
0.035
0.2
6
%
mV
mV
mV
OUT
OUT
OUT
OUT
IN
LT1117-2.85
LT1117-3.3
LT1117-5
= 0mA, 4.25V ≤ V ≤ 10V (Note 2)
1
1
1
IN
= 0mA, 4.75V ≤ V ≤ 15V (Note 2)
6
IN
= 0mA, 6.5V ≤ V ≤ 15V (Note 2)
10
IN
l
l
l
l
LT1117
(V – V ) = 3V, 10mA ≤ I ≤ 800mA (Note 2)
OUT
0.1
1
1
1
0.4
10
10
15
%
mV
mV
mV
IN
OUT
LT1117-2.85
LT1117-3.3
LT1117-5
V
V
V
= 4.25V, 0 ≤ I
= 4.75V, 0 ≤ I
≤ 800mA (Note 2)
≤ 800mA (Note 2)
IN
IN
IN
OUT
OUT
OUT
= 6.5V, 0 ≤ I
≤ 800mA (Note 2)
I
I
I
= 100mA, 0°C ≤ T ≤ 125°C (Note 3)
1.00
1.05
1.10
1.10
1.15
1.20
V
V
V
OUT
OUT
OUT
J
= 500mA, 0°C ≤ T ≤ 125°C (Note 3)
J
= 800mA, 0°C ≤ T ≤ 125°C (Note 3)
J
I
I
I
= 100mA, –40°C ≤ T < 0°C (Note 3)
1.00
1.05
1.10
1.20
1.25
1.30
V
V
V
OUT
OUT
OUT
J
= 500mA, –40°C ≤ T < 0°C (Note 3)
J
= 800mA, –40°C ≤ T < 0°C (Note 3)
J
Current Limit
(V – V ) = 5V, T = 25°C
800
950
1.7
1200
5
mA
mA
IN
OUT
J
l
Minimum Load Current
LT1117
(V – V ) = 15V (Note 4)
IN OUT
1117fd
3
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
Quiescent Current
LT1117-2.85
LT1117-3.3
LT1117-5
V
V
V
≤ 10V
≤ 15V
≤ 15V
5
5
5
10
10
10
mA
mA
mA
IN
IN
IN
Thermal Regulation
Ripple Rejection
T = 25°C, 30ms Pulse
0.01
75
0.1
%/W
dB
A
l
l
l
f
= 120Hz, (V – V ) = 3V, V
= 1V
P-P
60
RIPPLE
IN
OUT
RIPPLE
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise
Thermal Resistance
55
120
5
μA
10mA ≤ I
≤ 800mA, 1.4V ≤ (V – V ) ≤ 10V
0.2
μA
OUT
IN
OUT
0.5
%
T = 125°C, 1000Hrs
A
0.3
%
(% of V ), 10Hz ≤ f ≤ 10kHz
0.003
15
%
OUT
(Junction-to-Case, at Tab)
°C/W
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3: Dropout voltage is specified over the full output current range
of the device. Dropout voltage is defined as the minimum input/output
differential measured at the specified output current. Test points and limits
are also shown on the Dropout Voltage curve.
Note 2: See thermal regulation specification for changes in output voltage
due to heating effects. Load regulation and line regulation are measured at
a constant junction temperature by low duty cycle pulse testing.
Note 4: Minimum load current is defined as the minimum output current
required to maintain regulation.
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Operating Current
(Adjustable Device)
Short-Circuit Current
Load Regulation
4
3
2
1
0
1.25
1.00
0.10
0.05
ΔI
= 800mA
LOAD
T
T
= 125°C
= 25°C
J
J
T
T
= 125°C
= 25°C
J
J
0
0.75
0.50
0.25
0
–0.05
–0.10
–0.15
–0.20
T
= –55°C
J
0
5
10
15
20
0
5
10
15
–50 –25
0
25
50
75 100 125
INPUT/OUTPUT DIFFERENTIAL (V)
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
1117 G01
1117 G02
1117 G03
1117fd
4
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL PERFORMANCE CHARACTERISTICS
LT1117 Ripple Rejection
LT1117 Ripple Rejection
vs Current
Temperature Stability
100
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
2.0
V
C
C
= 5V
= 25μF
= 25μF
OUT
ADJ
OUT
V
≤
RIPPLE
P-P
V
≤ 3V
P-P
RIPPLE
0.5V
f
= 120Hz
RIPPLE
1.0
0
(V – V
≥ 3V
OUT)
IN
V
≤ 3V
P-P
RIPPLE
f
= 20kHz
P-P
RIPPLE
≤ 0.5V
V
(V – V
≥ V
DROPOUT
RIPPLE
IN
OUT)
30
20
10
0
–1.0
C
C
= 200μF AT f < 60Hz
= 25μF AT f > 60Hz
= 0.5A
ADJ
ADJ
OUT
10
0
I
–2.0
10
100
1k
FREQUENCY (Hz)
10k
100k
0
0.2
0.4
0.6
0.8
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
OUTPUT CURRENT (A)
1117 G04
1117 G05
1117 G06
LT1117-2.85
LT1117-5
Load Transient Response
Adjust Pin Current
Load Transient Response
100
90
80
70
60
50
0.3
0.2
0.3
0.2
C
C
V
= 10μF
= 10μF TANTALUM
= 4.25V
C
C
V
= 10μF
IN
OUT
IN
IN
OUT
IN
= 10μF TANTALUM
= 6.5V
PRELOAD = 0.1A
PRELOAD = 0.1A
0.1
0
0.1
0
–0.1
–0.2
0.5
0
–0.1
–0.2
0.5
0
40
30
20
10
0
–0.5
–0.5
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
0
10 20 30 40 50 60 70 80 90 100
TIME (μs)
0
10 20 30 40 50 60 70 80 90 100
TIME (μs)
1117 G07
1117 G08
1117 G09
LT1117-2.85
LT1117-5
Line Transient Response
Line Transient Response
60
60
40
C
C
= 1μF
= 10μF TANTALUM
= 0.1A
IN
C
C
= 1μF
= 10μF TANTALUM
= 0.1A
IN
OUT
OUT
40
20
OUT
OUT
I
I
20
0
0
–20
–40
5.25
4.25
3.25
–20
–40
7.50
6.50
5.50
0
0
20 40 60 80 100 120 140 160 180 200
TIME (μs)
20 40 60 80 100 120 140 160 180 200
TIME (μs)
1117 G10
1117 G11
1117fd
5
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
BLOCK DIAGRAM
IN
+
–
THERMAL
LIMIT
ADJ
OUT
GND
FOR FIXED VOLTAGE DEVICE
1117 BD01
1117fd
6
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
APPLICATIONS INFORMATION
Protection Diodes
The LT1117 family of 3-terminal regulators are easy to
use. They are protected against short circuit and thermal
overloads. Thermal protection circuitry will shut down the
regulator should the junction temperature exceed 165°C
at the sense point. These regulators are pin compatible
with older 3-terminal adjustable regulators, offer lower
dropout voltage and more precise reference tolerance.
Reference stability over temperature is improved over
older types of regulators.
In normal operation, the LT1117 family does not need any
protection diodes. Older adjustable regulators required
protection diodes between the adjust pin and the output
andbetweentheoutputandinputtopreventoverstressing
the die. The internal current paths on the LT1117 adjust
pin are limited by internal resistors. Therefore, even with
capacitorsontheadjustpin, noprotectiondiodeisneeded
to ensure device safety under short-circuit conditions.
Theadjustpincanbedriven,onatransientbasis, 25Vwith
respect to the output without any device degradation.
Stability
The LT1117 family of regulators requires an output
capacitor as part of the device frequency compensation.
A minimum of 10μF of tantalum or 50μF of aluminum
electrolytic is required. The ESR of the output capacitor
should be less than 0.5ꢀ. Surface mount tantalum
capacitors, which have very low ESR, are available from
several manufacturers.
Diodes between input and output are not usually needed.
The internal diode between the output and input pins of
the device can withstand microsecond surge currents of
10Ato20A.Normalpowersupplycyclingcannotgenerate
currentsofthismagnitude.Onlywithextremelylargeoutput
capacitors, such as 1000μF and larger, and with the input
pin instantaneously shorted to ground can damage occur.
AcrowbarcircuitattheinputoftheLT1117incombination
withalargeoutputcapacitorcouldgeneratecurrentslarge
enough to cause damage. In this case a diode from output
to input is recommended, as shown in Figure 1.
When using the LT1117 adjustable device, the adjust
terminal can be bypassed to improve ripple rejection.
When the adjust terminal is bypassed, the required value
of the output capacitor increases. The device will require
an output capacitor of 22μF tantalum or 150μF aluminum
electrolytic when the adjust pin is bypassed.
D1
1N4002
(OPTIONAL)
Normally, capacitor values on the order of 100μF are
used in the output of many regulators to ensure good
load transient response with large load current changes.
Output capacitance can be increased without limit and
largervaluesofoutputcapacitancefurtherimprovestability
and transient response.
LT1117
V
V
OUT
IN
OUT
IN
+
C
ADJ
OUT
150μF
R1
R2
+
C
ADJ
10μF
1117 F01
Figure 1
1117fd
7
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
APPLICATIONS INFORMATION
Output Voltage
R
P
PARASITIC
LINE RESISTANCE
LT1117
ADJ
TheLT1117developsa1.25Vreferencevoltagebetweenthe
output and the adjust terminal (see Figure 2). By placing a
resistor between these two terminals, a constant current
is caused to flow through R1 and down through R2 to
set the overall output voltage. Normally this current is
chosentobethespecifiedminimumloadcurrentof10mA.
V
IN
OUT
IN
R1
R
L
CONNECT
R1 TO CASE
R2
Because I
is very small and constant when compared
ADJ
to the current through R1, it represents a small error and
can usually be ignored. For fixed voltage devices R1 and
R2 are included in the device.
1117 F03
CONNECT
R2 TO LOAD
Figure 3. Connections for Best Load Regulation
LT1117
V
V
OUT
IN
OUT
IN
For fixed voltage devices the top of R1 is internally Kelvin
connected, and the ground pin can be used for negative
side sensing.
+
ADJ
V
R1
R2
REF
I
ADJ
50μA
R2
V
= V
1 +
+ I
R2
ADJ
—
OUT
REF
ꢀ
ꢁ
R1
Thermal Considerations
1117 F02
LT1117 series regulators have internal thermal limiting
circuitry designed to protect the device during overload
conditions.Forcontinuousnormalloadconditionshowever,
the maximum junction temperature rating of 125°C must
not be exceeded.
Figure 2. Basic Adjustable Regulator
Load Regulation
BecausetheLT1117isa3-terminaldevice,itisnotpossible
toprovidetrueremoteloadsensing.Loadregulationwillbe
limitedbytheresistanceofthewireconnectingtheregulator
totheload. Thedatasheetspecificationforloadregulation
is measured at the output pin of the device. Negative side
sensing is a true Kelvin connection, with the bottom of the
output divider returned to the negative side of the load.
Although it may not be immediately obvious, best load
regulation is obtained when the top of the resistor divider
(R1) is returned directly to the output pin of the device,
not to the load. This is illustrated in Figure 3. Connected
It is important to give careful consideration to all sources
of thermal resistance from junction to ambient. For
the SOT-223 package, which is designed to be surface
mounted,additionalheatsourcesmountednearthedevice
must also be considered. Heat sinking is accomplished
using the heat spreading capability of the PC board and
its copper traces. The thermal resistance of the LT1117 is
15°C/W from the junction to the tab. Thermal resistances
from tab to ambient can be as low as 30°C/W. The total
thermal resistance from junction to ambient can be as low
as45°C/W. ThisrequiresareasonablesizedPCboardwith
at least one layer of copper to spread the heat across the
board and couple it into the surrounding air.
as shown, R is not multiplied by the divider ratio. If R1
P
wereconnectedtotheload,theeffectiveresistancebetween
the regulator and the load would be:
R2+R1
RP ×
,RP =Parasitic Line Resistance
1117fd
8
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
APPLICATIONS INFORMATION
Experiments have shown that the heat spreading copper
layer does not need to be electrically connected to the
tab of the device. The PC material can be very effective at
transmitting heat between the pad area, attached to the
tab of the device, and a ground plane layer either inside
or on the opposite side of the board. Although the actual
thermal resistance of the PC material is high, the Length/
Area ratio of the thermal resistor between layers is small.
The data in Table 1 was taken using 1/16" FR-4 board with
1oz. copper foil. It can be used as a rough guideline in
estimating thermal resistance.
The power dissipation of the LT1117 is equal to:
P = ( V – V
)( I
)
OUT
D
IN
OUT
Maximum junction temperature will be equal to:
T = T
+ P (Thermal Resistance (junction-to-
D
J
A(MAX)
ambient))
Maximum junction temperature must not exceed 125°C.
Ripple Rejection
The curves for Ripple Rejection were generated using
an adjustable device with the adjust pin bypassed. These
curves will hold true for all values of output voltage. For
proper bypassing, and ripple rejection approaching the
values shown, the impedance of the adjust pin capacitor,
at the ripple frequency, should be < R1. R1 is normally in
the range of 100ꢀ to 200ꢀ. The size of the required adjust
pin capacitor is a function of the input ripple frequency. At
120Hz, with R1 = 100ꢀ, the adjust pin capacitor should
be >13μF. At 10kHz only 0.16μF is needed.
Table 1.
COPPER AREA
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
TOPSIDE*
BACKSIDE
2500 Sq. mm 2500 Sq. mm 2500 Sq. mm
1000 Sq. mm 2500 Sq. mm 2500 Sq. mm
225 Sq. mm 2500 Sq. mm 2500 Sq. mm
100 Sq. mm 2500 Sq. mm 2500 Sq. mm
1000 Sq. mm 1000 Sq. mm 1000 Sq. mm
45°C/W
45°C/W
53°C/W
59°C/W
52°C/W
55°C/W
1000 Sq. mm
0
1000 Sq. mm
For fixed voltage devices, and adjustable devices without
an adjust pin capacitor, the output ripple will increase as
the ratio of the output voltage to the reference voltage
* Tab of device attached to topside copper
The thermal resistance for each application will be
affected by thermal interactions with other components
on the board. Some experimentation will be necessary to
determine the actual value.
(V /V ). For example, with the output voltage equal
OUT REF
to 5V, the output ripple will be increased by the ratio of
5V/1.25V. It will increase by a factor of four. Ripple
rejection will be degraded by 12dB from the value shown
on the curve.
1117fd
9
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATIONS
1.2V to 10V Adjustable Regulator
5V Regulator with Shutdown
LT1117
LT1117
†
V
5V
V
V
IN
OUT
IN
OUT
IN
IN
OUT
R1
121Ω
121Ω
1%
ADJ
ADJ
+
10μF
1k
+
+
+
C1*
10μF
C2
100μF
100μF
R2
1k
2N3904
TTL
365Ω
1%
1k
* NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
R2
R1
1117 TA04
†
V
= 1.25V 1 +
(
—
OUT
)
1117 TA03
Remote Sensing
R
P
LT1117
ADJ
(MAX. DROP 300mV)
OUTPUT
5V
V
IN
OUT
IN
V
IN
+
100μF
25Ω
2
7
–
6
LM301A
+
R
1k
L
1
3
10μF
+
121Ω
8
4
5μF
365Ω
100pF
RETURN
25Ω
RETURN
1117 TA05
Adjusting Output Voltage of Fixed Regulators
Regulator with Reference
LT1117-5
LT1117-5
V
> 12V
5V TO 10V
V
> 11.5V
10V
IN
OUT
IN
OUT
IN
IN
+
+
+
+
GND
GND
100μF
10μF
100μF
10μF
5V
OUT
+
10μF*
1k
LT1029
1117 TA07
* OPTIONAL IMPROVES RIPPLE REJECTION
1117 TA06
1117fd
10
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATIONS
Battery Charger
Battery Backed Up Regulated Supply
LT1117-5
GND
LT1117
IF
OUT
5.2V LINE
5.0V BATTERY
V
V
OUT
IN
V
IN
OUT
IN
IN
1.25V
ADJ
R
S
+
10μF
R1
50Ω
R2
—
R1
V
– 1.25V 1 +
(
OUT
)
SELECT FOR
IF =
CHARGE RATE
R2
R1
LT1117-5
GND
–R 1 +
S
—
(
)
IN
OUT
+
+
1
ΔIF
V
=
6.5V
10μF
100μF
R2
R1
Δ
OUT
–R 1 +
—
S
(
)
1117 TA09
1117 TA08
Improving Ripple Rejection
Automatic Light Control
LT1117
OUT
LT1117
V
5V
IN
IN
OUT
R1
IN
+
+
+
ADJ
1.2k
ADJ
100μF
10μF
121Ω
10μF
+
1%
150μF
+
R2
365Ω
1%
C1
10μF
*C1 IMPROVES RIPPLE
REJECTION. X SHOULD BE
C
≈ R1 AT RIPPLE FREQUENCY
1117 TA11
1117 TA10
High Efficiency Dual Supply
FEEDBACK PATH
MUR410
3.3V OUTPUT (TYPICAL)
470μF
+
LT1117-5
OUT
MUR410
+5V
IN
0.5A
GND
+
+
+
10μF
10μF
1N4002
470μF
+V
IN
LT1117-5
MUR410
IN
OUT
SWITCHING
REGULATOR
GND
+
1N4002
470μF
–5V
0.5A
1117 TA12
1117fd
11
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATIONS
High Efficiency Dual Linear Supply
L1
LT1117-5
OUT
285μH
5V
0.5A
IN
+
MBR360
1000μF
GND
(HEAT SINK)
2.4k
Q1
2N6667
10k
1k
510k
(DARLINGTON)
LT1004-2.5
30k
+
+
D11
1N4002
100μF
20k*
30.1k*
+
MDA201
V
+
–
+
1/2
LT1018
4700μF
–
L1
LT1117-5
130VAC
TO 90VAC
STANCOR
P-8685
285μH
IN
OUT
+
MBR360
1k
GND
1000μF
(HEAT SINK)
2.4k
30k
2N6667
10k
510k
(DARLINGTON)
LT1004-2.5
+
+
D2
1N4002
100μF
20k*
30.1k*
MDA201
+
+
1/2
LT1018
4700μF
–
–
–
V
–5V
0.5A
= 1% FILM RESISTORS
= MOTOROLA
= PULSE ENGINEERING, INC. #PE-92106
*
MDA
L1
1117 TA13
Low Dropout Negative Supply
LT1117-5
V
IN
OUT
IN
GND
+
+
10μF
100μF
V
= –5V
OUT
FLOATING INPUT
1117 TA14
1117fd
12
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
PACKAGE DESCRIPTION
M Package
3-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1460)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
.060
(1.524)
.165 – .180
(4.191 – 4.572)
.256
(6.502)
.045 – .055
(1.143 – 1.397)
15°
+.008
.004
–.004
.060
(1.524)
.183
(4.648)
.330 – .370
(8.382 – 9.398)
.059
(1.499)
+0.203
–0.102
0.102
(
)
.095 – .115
(2.413 – 2.921)
.075
(1.905)
.100
(2.54)
BSC
.050 .012
(1.270 0.305)
.300
(7.620)
+.012
.143
.013 – .023
(0.330 – 0.584)
–.020
.050
(1.270)
+0.305
3.632
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
(
)
–0.508
.420
.276
.080
.420
.350
.325
.205
.565
.565
.320
.090
.090
M (DD3) 0204
.100
.070
.070
.100
RECOMMENDED SOLDER PAD LAYOUT
RECOMMENDED SOLDER PAD LAYOUT
FOR THICKER SOLDER PASTE APPLICATIONS
NOTE:
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
1117fd
13
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
PACKAGE DESCRIPTION
ST Package
3-Lead Plastic SOT-223
(Reference LTC DWG # 05-08-1630)
.248 – .264
(6.30 – 6.71)
.129 MAX
.114 – .124
(2.90 – 3.15)
.059 MAX
.264 – .287
(6.70 – 7.30)
.248 BSC
.130 – .146
(3.30 – 3.71)
.039 MAX
.059 MAX
.090
BSC
.181 MAX
RECOMMENDED SOLDER PAD LAYOUT
.033 – .041
(0.84 – 1.04)
.0905
(2.30)
BSC
10° – 16°
.010 – .014
10°
MAX
.071
(1.80)
MAX
(0.25 – 0.36)
10° – 16°
.0008 – .0040
(0.0203 – 0.1016)
.024 – .033
(0.60 – 0.84)
.012
(0.31)
MIN
.181
(4.60)
BSC
ST3 (SOT-233) 0502
1117fd
14
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
REVISION HISTORY (Revision history begins at Rev D)
REV
DATE
DESCRIPTION
PAGE NUMBER
D
4/10
Updated DD-Pak part markings in Order Information section and revised all other sections.
1 to 16
1117fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATION
High Efficiency Regulator
LT1117
ADJ
1mH
OUTPUT
100μF
28V INPUT
IN
OUT
+
240Ω
2k
OUTPUT
ADJUST
MR1122 10,000μF
+
10k
470Ω
1N914
28V
1k
1M
4N28
10k
+
LT1011
10k
28V
–
1N914
1117 TA15
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1118
Low I , Low Dropout, 800mA, Source
Sources and Sinks Current, 600mA Quiescent Current, Dropout Voltage: 1V, SOIC-8 and
SOT-223 Packages
Q
and Sink Regulators
LT1129
700mA Micropower Low Dropout
Regulator
50μA Quiescent Current
LT1763
500mA, Low Noise LDO
300mV Dropout Voltage, Low Noise: 20μV , V = 1.8V to 20V, SO-8 Package
RMS IN
LT1764, LT1764A
3A, Fast Transient Response, Low Noise 340mV Dropout Voltage, Low Noise: 40μV
, V = 2.7V to 20V, TO-220 and DD
RMS IN
LDO
Packages “A” version stable also with ceramic caps
LT1963, LT1763A
LT1965
1.5A Low Noise, Fast Transient Response 340mV Dropout Voltage, Low Noise: 40μV
, V = 2.5V to 20V, “A” version stable
RMS IN
LDO
with ceramic caps, TO-220, DD, SOT-223 and SO-8 Packages
1.1A, Low Noise, Low Dropout Linear
Regulator
290mV Dropout Voltage, Low Noise: 40μV , V : 1.8V to 20V, V : 1.2V to 19.5V,
RMS IN
OUT
stable with ceramic caps, TO-220, DDPak, MSOP and 3 × 3 DFN Packages
V : 0.9V to 10V, Dropout Voltage: 160mV Typical, Adjustable Output (V = V
OUT(MIN)
LT3021
500mA, Low Voltage, VLDO Linear
Regulator
IN
REF
= 200mV), Fixed Output Voltages: 1.2V, 1.5V, 1.8V, Stable with Low ESR, Ceramic
Output Capacitors 16-Pin DFN (5mm × 5mm) and 8-Lead SO Packages
LT3080, LT3080-1
LT3085
1.1A, Parallelable, Low Noise, Low
Dropout Linear Regulator
300mV Dropout Voltage (2-supply operation), Low Noise: 40μV
, V : 1.2V to 36V,
set; directly parallelable
RMS IN
V
: 0V to 35.7V, current-based reference with 1-resistor V
OUT
OUT
(no op amp required), stable with ceramic caps, TO-220, SOT-223, MS8E and 3 × 3
DFN-8 Packages; “-1” version has integrated internal ballast resistor
500mA, Parallelable, Low Noise, Low
Dropout Linear Regulator
275mV Dropout Voltage (2-supply operation), Low Noise: 40μV
, V : 1.2V to 36V,
set; directly parallelable
RMS IN
V
: 0V to 35.7V, current-based reference with 1-resistor V
OUT
OUT
(no op amp required), stable with ceramic caps, MS8E and 2 × 3 DFN-6 packages
LTC3025-1, LTC3025-2, 500mA Micropower VLDO Linear
LTC3025-3, LTC3025-4 Regulator in 2 × 2 DFN
V
IN
= 0.9V to 5.5V, Dropout Voltage: 75mV, Low Noise 80μV , Low I : 54μA, Fixed
RMS
Q
Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3), 1.8V (LTC3025-4); Adjustable Output
Range: 0.4V to 3.6V (LTC3025-1), 2mm × 2mm 6-Lead DFN Package
LTC3026
1.5A, Low Input Voltage VLDO Linear
Regulator
V : 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V), VDO = 0.1V, I =
IN Q
950μA, Stable with 10μF Ceramic Capacitors, 10-Lead MSOP-E and DFN-10 Packages
1117fd
LT 0410 REV D• PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 1993
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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