LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
1
1117fd
TYPICAL APPLICATION
FEATURES DESCRIPTION
800mA Low Dropout
Positive Regulators Adjustable
and Fixed 2.85V, 3.3V, 5V
The LT
®
1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
available in an adjustable version and fixed output voltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
specifically to be used in Active Terminators for the SCSI
bus. All internal circuitry is designed to operate down to 1V
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.
The low profi le surface mount SOT-223 package allows the
device to be used in applications where space is limited. The
LT1117 requires a minimum of 10µF of output capacitance
for stability. Output capacitors of this size or larger are
normally included in most regulator designs.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent current
of the LT1117 fl ows into the load, increasing effi ciency.
Dropout Voltage (VIN – VOUT)
APPLICATIONS
n Space Saving SOT-223 Surface Mount Package
n 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
n Output Current of 800mA
n Operates Down to 1V Dropout
n Guaranteed Dropout Voltage at Multiple Current Levels
n 0.2% Line Regulation Max
n 0.4% Load Regulation Max
n Active SCSI Terminators
n High Effi ciency Linear Regulators
n Post Regulators for Switching Supplies
n Battery Chargers
n 5V to 3.3V Linear Regulators
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.
OUTPUT CURRENT (mA)
0
0
DROPOUT VOLTAGE (V)
0.2
0.4
0.6
0.8
1.0
1.4
100 400 600 800
1117 TA02
1.2
200 300 500 700
TJ = 25°C
TJ = 125°C
INDICATES GUARANTEED TEST POINT
0°C ≤ TJ ≤ 125°C
–40°C ≤ TJ < 0°C
18 TO 27
LINES
1117 TA01
10µF
110
110
110
110
4.75V TO
5.25V 22µF
LT1117-2.85
IN
GND
OUT
+ +
Active Terminator for SCSI-2 Bus
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
2
1117fd
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Voltage
LT1117, LT1117-3.3, LT1117-5 .........................15V
LT1117-2.85 .....................................................10V
Surge Voltage
LT1117, LT1117-3.3, LT1117-5 .........................20V
(Note 1)
FRONT VIEW
TAB IS
VOUT
IN
OUT
ADJ/GND
ST PACKAGE
3-LEAD PLASTIC SOT-223
3
2
1
TJMAX = 125°C, θJC = 15°C/W
M PACKAGE
3-LEAD PLASTIC DD-PAK
FRONT VIEW
3
2
1
IN
OUT
ADJ/GND
TAB IS
VOUT
TJMAX = 125°C, θJC = 10°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1117CST#PBF LT1117CST#TRPBF 1117 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST#PBF LT1117IST#TRPBF 1117I 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CST-2.85#PBF LT1117CST-2.85#TRPBF 11172 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST-2.85#PBF LT1117IST-2.85#TRPBF 1117I2 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CST-3.3#PBF LT1117CST-3.3#TRPBF 11173 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST-3.3#PBF LT1117IST-3.3#TRPBF 1117I3 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CST-5#PBF LT1117CST-5#TRPBF 11175 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST-5#PBF LT1117IST-5#TRPBF 1117I5 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CM#PBF LT1117CM#TRPBF LT1117CM 3-Lead Plastic DD-PAK 0°C to 125°C
LT1117CM-2.85#PBF LT1117CM-2.85#TRPBF LT1117CM-2.85 3-Lead Plastic DD-PAK 0°C to 125°C
LT1117CM-3.3#PBF LT1117CM-3.3#TRPBF LT1117CM-3.3 3-Lead Plastic DD-PAK 0°C to 125°C
LT1117CM-5#PBF LT1117CM-5#TRPBF LT1117CM-5 3-Lead Plastic DD-PAK 0°C to 125°C
Operating JunctionTemperature Range
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/LT1117-2.85
LT1117-3.3/LT1117-5
3
1117fd
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage LT1117 IOUT = 10mA, (VIN – VOUT) = 2V, TJ = 25°C
10mA ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V l
1.238
1.225
1.250
1.250
1.262
1.270
V
V
Output Voltage LT1117-2.85 IOUT = 10mA, VIN = 4.85V, TJ = 25°C
0 ≤ IOUT ≤ 800mA, 4.25V ≤ VIN ≤ 10V
0 ≤ IOUT ≤ 500mA, VIN = 3.95V
l
l
2.820
2.790
2.790
2.850
2.850
2.850
2.880
2.910
2.910
V
V
V
LT1117-3.3 IOUT = 10mA, VIN = 5V, TJ = 25°C
0 ≤ IOUT ≤ 800mA, 4.75V ≤ VIN ≤ 10V l
3.267
3.235
3.300
3.300
3.333
3.365
V
V
LT1117-5 IOUT = 10mA, VIN = 7V, TJ = 25°C
0 ≤ IOUT ≤ 800mA, 6.5V ≤ VIN ≤ 12V l
4.950
4.900
5.000
5.000
5.050
5.100
V
V
Line Regulation LT1117
LT1117-2.85
LT1117-3.3
LT1117-5
IOUT = 10mA, 1.5V ≤ VIN – VOUT ≤ 15V (Note 2)
IOUT = 0mA, 4.25V ≤ VIN ≤ 10V (Note 2)
IOUT = 0mA, 4.75V ≤ VIN ≤ 15V (Note 2)
IOUT = 0mA, 6.5V ≤ VIN ≤ 15V (Note 2)
l
l
l
l
0.035
1
1
1
0.2
6
6
10
%
mV
mV
mV
Load Regulation LT1117
LT1117-2.85
LT1117-3.3
LT1117-5
(VIN – VOUT) = 3V, 10mA ≤ IOUT ≤ 800mA (Note 2)
VIN = 4.25V, 0 ≤ IOUT ≤ 800mA (Note 2)
VIN = 4.75V, 0 ≤ IOUT ≤ 800mA (Note 2)
VIN = 6.5V, 0 ≤ IOUT ≤ 800mA (Note 2)
l
l
l
l
0.1
1
1
1
0.4
10
10
15
%
mV
mV
mV
Dropout Voltage IOUT = 100mA, 0°C ≤ TJ ≤ 125°C (Note 3)
IOUT = 500mA, 0°C ≤ TJ ≤ 125°C (Note 3)
IOUT = 800mA, 0°C ≤ TJ ≤ 125°C (Note 3)
1.00
1.05
1.10
1.10
1.15
1.20
V
V
V
IOUT = 100mA, –40°C ≤ TJ < 0°C (Note 3)
IOUT = 500mA, –40°C ≤ TJ < 0°C (Note 3)
IOUT = 800mA, –40°C ≤ TJ < 0°C (Note 3)
1.00
1.05
1.10
1.20
1.25
1.30
V
V
V
Current Limit (VIN – VOUT) = 5V, TJ = 25°C 800 950 1200 mA
Minimum Load Current LT1117 (VIN – VOUT) = 15V (Note 4) l1.7 5 mA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1117CST LT1117CST#TR 1117 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST LT1117IST#TR 1117I 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CST-2.85 LT1117CST-2.85#TR 11172 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST-2.85 LT1117IST-2.85#TR 1117I2 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CST-3.3 LT1117CST-3.3#TR 11173 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST-3.3 LT1117IST-3.3#TR 1117I3 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CST-5 LT1117CST-5#TR 11175 3-Lead Plastic SOT-223 0°C to 125°C
LT1117IST-5 LT1117IST-5#TR 1117I5 3-Lead Plastic SOT-223 –40°C to 125°C
LT1117CM LT1117CM#TR LT1117CM 3-Lead Plastic DD-PAK 0°C to 125°C
LT1117CM-2.85 LT1117CM-2.85#TR LT1117CM-2.85 3-Lead Plastic DD-PAK 0°C to 125°C
LT1117CM-3.3 LT1117CM-3.3#TR LT1117CM-3.3 3-Lead Plastic DD-PAK 0°C to 125°C
LT1117CM-5 LT1117CM-5#TR LT1117CM-5 3-Lead Plastic DD-PAK 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/
ORDER INFORMATION
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
4
1117fd
Minimum Operating Current
(Adjustable Device) Short-Circuit Current Load Regulation
INPUT/OUTPUT DIFFERENTIAL (V)
0
0
MINIMUM OPERATING CURRENT (mA)
1
3
4
10 15 20
1117 G01
5
TJ = 25°C
TJ = 125°C
TJ = –55°C
2
INPUT/OUTPUT DIFFERENTIAL (V)
0
0
SHORT CIRCUIT CURRENT (A)
0.25
0.50
0.75
1.25
10 15
1117 G02
5
1.00
TJ = 25°C
TJ = 125°C
TEMPERATURE (°C)
–50
–0.20
OUTPUT VOLTAGE DEVIATION (%)
–0.15
–0.10
–0.05
0.10
50 75 125
1117 G03
0
0.05
0
–25 25 100
∆ILOAD = 800mA
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current LT1117-2.85
LT1117-3.3
LT1117-5
VIN ≤ 10V
VIN ≤ 15V
VIN ≤ 15V
l
l
l
5
5
5
10
10
10
mA
mA
mA
Thermal Regulation TA = 25°C, 30ms Pulse 0.01 0.1 %/W
Ripple Rejection fRIPPLE = 120Hz, (VIN – VOUT) = 3V, VRIPPLE = 1VP-P l60 75 dB
Adjust Pin Current l55 120 µA
Adjust Pin Current Change 10mA ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V l0.2 5 µA
Temperature Stability 0.5 %
Long Term Stability TA = 125°C, 1000Hrs 0.3 %
RMS Output Noise (% of VOUT), 10Hz ≤ f ≤ 10kHz 0.003 %
Thermal Resistance (Junction-to-Case, at Tab) 15 °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 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 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 4: Minimum load current is defined as the minimum output current
required to maintain regulation.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
TYPICAL PERFORMANCE CHARACTERISTICS
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
5
1117fd
TYPICAL PERFORMANCE CHARACTERISTICS
LT1117 Ripple Rejection
LT1117 Ripple Rejection
vs Current Temperature Stability
Adjust Pin Current
LT1117-2.85
Load Transient Response
LT1117-5
Load Transient Response
FREQUENCY (Hz)
20
RIPPLE REJECTION (dB)
40
60
80
100
10 1k 10k 100k
1117 G04
0
100
90
70
50
30
10
CADJ = 200µF AT f < 60Hz
CADJ = 25µF AT f > 60Hz
IOUT = 0.5A
(VIN – VOUT) ≥ VDROPOUT
VRIPPLE ≤ 3VP-P VRIPPLE ≤
0.5VP-P
(VIN – VOUT) ≥ 3V
OUTPUT CURRENT (A)
0
0
RIPPLE REJECTION (dB)
20
30
50
80
100
0.2 0.4 0.6 0.8
1117 G05
10
40
60
70
90
VOUT = 5V
CADJ = 25µF
COUT = 25µF
VRIPPLE ≤ 3VP-P
fRIPPLE = 120Hz
fRIPPLE = 20kHz
VRIPPLE ≤ 0.5VP-P
TEMPERATURE (°C)
–50
–2.0
OUTPUT VOLTAGE CHANGE (%)
–1.0
0
2.0
0 50 100 150
1117 G06
1.0
–25 25 75 125
TEMPERATURE (°C)
–50
0
ADJUST PIN CURRENT (µA)
20
50
100
0 50 100 150
1117 G07
80
–25 25 75 125
10
30
40
60
70
90
TIME (µs)
0
–0.5
LOAD CURRENT
(A)
0.3
20 50 70 100
1117 G08
0.1
10 30 60 80
0
0.5
–0.2
0
0.2
–0.1
40 90
OUTPUT VOLTAGE
DEVIATION (V)
CIN = 10µF
COUT = 10µF TANTALUM
VIN = 4.25V
PRELOAD = 0.1A
TIME (µs)
0
–0.5
LOAD CURRENT
(A)
0.3
20 50 70 100
1117 G09
0.1
10 30 60 80
0
0.5
–0.2
0
0.2
–0.1
40 90
OUTPUT VOLTAGE
DEVIATION (V)
CIN = 10µF
COUT = 10µF TANTALUM
VIN = 6.5V
PRELOAD = 0.1A
LT1117-2.85
Line Transient Response
LT1117-5
Line Transient Response
TIME (µs)
0
3.25
INPUT VOLTAGE
(V)
60
40 100 140 200
1117 G10
20
20 60 120 160
4.25
5.25
–40
0
40
–20
80 180
OUTPUT VOLTAGE
DEVIATION (mV)
CIN = 1µF
COUT = 10µF TANTALUM
IOUT = 0.1A
TIME (µs)
0
5.50
INPUT VOLTAGE
(V)
60
40 100 140 200
1117 G11
20
20 60 120 160
6.50
7.50
–40
0
40
–20
80 180
OUTPUT VOLTAGE
DEVIATION (mV)
CIN = 1µF
COUT = 10µF TANTALUM
IOUT = 0.1A
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
6
1117fd
1117 BD01
–
+
THERMAL
LIMIT
OUT
IN
ADJ
GND FOR FIXED VOLTAGE DEVICE
BLOCK DIAGRAM
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
7
1117fd
APPLICATIONS INFORMATION
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.
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 0.5Ω. Surface mount tantalum
capacitors, which have very low ESR, are available from
several manufacturers.
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.
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
larger values of output capacitance further improve stability
and transient response.
Protection Diodes
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
and between the output and input to prevent over stressing
the die. The internal current paths on the LT1117 adjust
pin are limited by internal resistors. Therefore, even with
capacitors on the adjust pin, no protection diode is needed
to ensure device safety under short-circuit conditions.
The adjust pin can be driven, on a transient basis, ± 25V with
respect to the output without any device degradation.
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
10A to 20A. Normal power supply cycling can not generate
currents of this magnitude. Only with extremely large output
capacitors, such as 1000µF and larger, and with the input
pin instantaneously shorted to ground can damage occur.
A crowbar circuit at the input of the LT1117 in combination
with a large output capacitor could generate currents large
enough to cause damage. In this case a diode from output
to input is recommended, as shown in Figure 1.
1117 F01
+
+
D1
1N4002
(OPTIONAL)
CADJ
10µFR2
R1 COUT
150µF
VOUT
VIN
LT1117
IN
ADJ
OUT
Figure 1
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
8
1117fd
APPLICATIONS INFORMATION
Output Voltage
The LT1117 develops a 1.25V reference voltage between the
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
chosen to be the specified minimum load current of 10mA.
Because IADJ is very small and constant when compared
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 F02
R2
R1
VOUT
VIN
VREF
IADJ
50µA
LT1117
IN
ADJ
OUT
VOUT = VREF 1 + + IADJ R2
R2
—
R1
+
Figure 2. Basic Adjustable Regulator
Load Regulation
Because the LT1117 is a 3-terminal device, it is not possible
to provide true remote load sensing. Load regulation will be
limited by the resistance of the wire connecting the regulator
to the load. The data sheet specification for load regulation
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
as shown, RP is not multiplied by the divider ratio. If R1
were connected to the load, the effective resistance between
the regulator and the load would be:
RRR
R
R
PP
×+=
21
1
,Parasitic Line Resistance
1117 F03
R2
R1
VIN
RP
PARASITIC
LINE RESISTANCE
RL
CONNECT
R1 TO CASE
CONNECT
R2 TO LOAD
LT1117
IN
ADJ
OUT
Figure 3. Connections for Best Load Regulation
For fixed voltage devices the top of R1 is internally Kelvin
connected, and the ground pin can be used for negative
side sensing.
Thermal Considerations
LT1117 series regulators have internal thermal limiting
circuitry designed to protect the device during overload
conditions. For continuous normal load conditions however,
the maximum junction temperature rating of 125°C must
not be exceeded.
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, additional heat sources mounted near the device
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
as 45°C/W. This requires a reasonable sized PC board with
at least one layer of copper to spread the heat across the
board and couple it into the surrounding air.
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
9
1117fd
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.
Table 1.
COPPER AREA
BOARD AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)TOPSIDE* BACKSIDE
2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 45°C/W
1000 Sq. mm 2500 Sq. mm 2500 Sq. mm 45°C/W
225 Sq. mm 2500 Sq. mm 2500 Sq. mm 53°C/W
100 Sq. mm 2500 Sq. mm 2500 Sq. mm 59°C/W
1000 Sq. mm 1000 Sq. mm 1000 Sq. mm 52°C/W
1000 Sq. mm 0 1000 Sq. mm 55°C/W
* 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.
The power dissipation of the LT1117 is equal to:
P
D = ( VIN – VOUT )( IOUT )
Maximum junction temperature will be equal to:
T
J = TA(MAX) + PD (Thermal Resistance (junction-to-
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 100Ω to 200Ω. The size of the required adjust
pin capacitor is a function of the input ripple frequency. At
120Hz, with R1 = 100Ω, the adjust pin capacitor should
be >13µF. At 10kHz only 0.16µF is needed.
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
(VOUT/VREF). For example, with the output voltage equal
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.
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
10
1117fd
TYPICAL APPLICATIONS
1117 TA03
+
R1
121
C2
100µF
VOUT†
VIN
VOUT = 1.25V 1 + R2
—
R1
+C1*
10µF R2
1k
NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS*
†
LT1117
IN
ADJ
OUT
()
Adjusting Output Voltage of Fixed Regulators Regulator with Reference
121
1%
100µF
5VVIN
10µF
365
1%
1k
1k
+
+
TTL
1117 TA04
LT1117
IN
ADJ
OUT
2N3904
Remote Sensing
1117 TA05
121
VIN
RP
(MAX. DROP 300mV)
10µF
+
+
+
+
–
100µF
365 100pF
5µF
25
1k
25
VIN
RL
72
3
4
8
1
6LM301A
OUTPUT
5V
RETURN
RETURN
LT1117
IN
ADJ
OUT
100µF
5V TO 10VVIN > 12V
10µF
1117 TA06
10µF* 1k
* OPTIONAL IMPROVES RIPPLE REJECTION
LT1117-5
IN
GND
OUT
+
++
100µF
10VVIN > 11.5V
10µF
1117 TA07
5VOUT
LT1029
LT1117-5
IN
GND
OUT ++
1.2V to 10V Adjustable Regulator 5V Regulator with Shutdown
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
11
1117fd
TYPICAL APPLICATIONS
Battery Charger Battery Backed Up Regulated Supply
1117 TA08
VOUT
VIN
R1
IF
RS
1.25V
ADJ
LT1117
IN OUT
VOUT – 1.25V 1 + R2
—
R1
IF =
–RS 1 + R2
—
R1
1
=
–RS 1 + R2
—
R1
()
∆IF
∆VOUT
()
()
100µF
5.2V LINE
5.0V BATTERY
VIN
10µF
1117 TA09
50
SELECT FOR
CHARGE RATE
6.5V 10µF
LT1117-5
IN
GND
OUT
LT1117-5
IN
GND
OUT ++
+
Improving Ripple Rejection Automatic Light Control
R1
121
1%
5VVIN
10µF
C1
10µF
150µF
R2
365
1%
*C1 IMPROVES RIPPLE
REJECTION. XC SHOULD BE
≈ R1 AT RIPPLE FREQUENCY 1117 TA10
LT1117
IN
ADJ
OUT
+
+
+1.2k
10µF 100µF
1117 TA11
LT1117
IN
ADJ
OUT
++
High Effi ciency Dual Supply
+5V
0.5A
+VIN
10µF
1117 TA12
1N4002
470µF
10µF 1N4002
470µF
MUR410
MUR410
MUR410
SWITCHING
REGULATOR
470µF
3.3V OUTPUT (TYPICAL)
–5V
0.5A
FEEDBACK PATH
LT1117-5
IN
GND
OUT
LT1117-5
IN
GND
OUT
+
+
+
+
+
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
12
1117fd
TYPICAL APPLICATIONS
100µF
1117 TA13
D2
1N4002
1000µF
MBR360
–5V
0.5A
–
+
2.4k
510k1k
30k
20k* 30.1k*
LT1004-2.5
10k
4700µF
MDA201
+
–
(HEAT SINK)
2N6667
(DARLINGTON)
L1
285µH
1/2
LT1018
100µF
1000µF
MBR360
–
+
2.4k
510k1k
30k
20k* 30.1k*
LT1004-2.5
10k
4700µF
MDA201
+
–
(HEAT SINK)
2N6667
(DARLINGTON)
L1
285µH
1/2
LT1018
D11
1N4002
5V
0.5A
STANCOR
P-8685
130VAC
TO 90VAC
*
MDA
L1
= 1% FILM RESISTORS
= MOTOROLA
= PULSE ENGINEERING, INC. #PE-92106
V+
V–
LT1117-5
IN
GND
OUT
LT1117-5
IN
GND
OUT
Q1
+
+
+
+
+
+
High Effi ciency Dual Linear Supply
Low Dropout Negative Supply
100µF
VIN
1117 TA14
VOUT = –5V
10µF
FLOATING INPUT
LT1117-5
IN
GND
OUT
++
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
13
1117fd
PACKAGE DESCRIPTION
M Package
3-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1460)
.050
(1.270)
.143 +.012
–.020
()
3.632 +0.305
–0.508
.100
(2.54)
BSC
.013 – .023
(0.330 – 0.584)
.095 – .115
(2.413 – 2.921)
.004 +.008
–.004
()
0.102 +0.203
–0.102
.050 ± .012
(1.270 ± 0.305)
.059
(1.499)
.045 – .055
(1.143 – 1.397)
.165 – .180
(4.191 – 4.572)
.330 – .370
(8.382 – 9.398)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
15°
.300
(7.620)
.075
(1.905)
.183
(4.648)
.060
(1.524)
.060
(1.524)
.256
(6.502)
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
M (DD3) 0204
.420
.350
.565
.090
.070
.100
.420
.276
.325
.205
.080
.565
.090
.070
.100
RECOMMENDED SOLDER PAD LAYOUT
FOR THICKER SOLDER PASTE APPLICATIONS
RECOMMENDED SOLDER PAD LAYOUT
NOTE:
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
.320
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
14
1117fd
ST Package
3-Lead Plastic SOT-223
(Reference LTC DWG # 05-08-1630)
PACKAGE DESCRIPTION
.114 – .124
(2.90 – 3.15)
.248 – .264
(6.30 – 6.71)
.130 – .146
(3.30 – 3.71)
.264 – .287
(6.70 – 7.30)
.0905
(2.30)
BSC
.033 – .041
(0.84 – 1.04)
.181
(4.60)
BSC
.024 – .033
(0.60 – 0.84)
.071
(1.80)
MAX
10°
MAX
.012
(0.31)
MIN
.0008 – .0040
(0.0203 – 0.1016)
10° – 16°
.010 – .014
(0.25 – 0.36)
10° – 16°
RECOMMENDED SOLDER PAD LAYOUT
ST3 (SOT-233) 0502
.129 MAX
.059 MAX
.059 MAX
.181 MAX
.039 MAX
.248 BSC
.090
BSC
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
15
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.
REVISION HISTORY
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
(Revision history begins at Rev D)
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
16
1117fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1993
LT 0410 REV D• PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1118 Low IQ, Low Dropout, 800mA, Source
and Sink Regulators
Sources and Sinks Current, 600mA Quiescent Current, Dropout Voltage: 1V, SOIC-8 and
SOT-223 Packages
LT1129 700mA Micropower Low Dropout
Regulator
50µA Quiescent Current
LT1763 500mA, Low Noise LDO 300mV Dropout Voltage, Low Noise: 20µVRMS, VIN = 1.8V to 20V, SO-8 Package
LT1764, LT1764A 3A, Fast Transient Response, Low Noise
LDO
340mV Dropout Voltage, Low Noise: 40µVRMS, VIN = 2.7V to 20V, TO-220 and DD
Packages “A” version stable also with ceramic caps
LT1963, LT1763A 1.5A Low Noise, Fast Transient Response
LDO
340mV Dropout Voltage, Low Noise: 40µVRMS, VIN = 2.5V to 20V, “A” version stable
with ceramic caps, TO-220, DD, SOT-223 and SO-8 Packages
LT1965 1.1A, Low Noise, Low Dropout Linear
Regulator
290mV Dropout Voltage, Low Noise: 40µVRMS, VIN: 1.8V to 20V, VOUT
: 1.2V to 19.5V,
stable with ceramic caps, TO-220, DDPak, MSOP and 3 × 3 DFN Packages
LT3021 500mA, Low Voltage, VLDO Linear
Regulator
VIN: 0.9V to 10V, Dropout Voltage: 160mV Typical, Adjustable Output (VREF = VOUT(MIN)
= 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 1.1A, Parallelable, Low Noise, Low
Dropout Linear Regulator
300mV Dropout Voltage (2-supply operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V,
VOUT
: 0V to 35.7V, current-based reference with 1-resistor VOUT set; directly parallelable
(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
LT3085 500mA, Parallelable, Low Noise, Low
Dropout Linear Regulator
275mV Dropout Voltage (2-supply operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V,
VOUT
: 0V to 35.7V, current-based reference with 1-resistor VOUT set; directly parallelable
(no op amp required), stable with ceramic caps, MS8E and 2 × 3 DFN-6 packages
LTC3025-1, LTC3025-2,
LTC3025-3, LTC3025-4
500mA Micropower VLDO Linear
Regulator in 2 × 2 DFN
VIN = 0.9V to 5.5V, Dropout Voltage: 75mV, Low Noise 80µVRMS, Low IQ: 54µA, Fixed
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
VIN: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V), VDO = 0.1V, IQ =
950µA, Stable with 10µF Ceramic Capacitors, 10-Lead MSOP-E and DFN-10 Packages
TYPICAL APPLICATION
2k
OUTPUT
ADJUST
240
100µF
470
1N914
4N28
–
+
1N914
1k
MR1122
10k
28V INPUT
1mH
10,000µF
1M
10k
10k
LT1011
1117 TA15
28V
OUTPUT
28V
LT1117
IN
ADJ
OUT
+
+
High Effi ciency Regulator
