Page 1
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Positive Regulators
Adjustable and Fixed 2.85V,
3.3V, 5V
EATU
F
■
Space Saving SOT-223 Surface Mount Package
■
Three-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
■
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
PPLICATI
A
■
Active SCSI Terminators
■
High Efficiency Linear Regulators
■
Post Regulators for Switching Supplies
■
Battery Chargers
■
5V to 3.3V Linear Regulators
RE
S
O
U
S
DUESCRIPTIO
The LT1117 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 profile 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 flows into the load, increasing
efficiency.
4.75V TO
5.25V
U
O
A
PPLICATITYPICAL
Active Terminator for SCSI-2 Bus Dropout Voltage (VIN – V
LT1117-2.85
IN
+ +
10µF
OUT
GND
22µF
110Ω
110Ω
110Ω
110Ω
18 TO 27
LINES
LT1117 • TA01
1.4
1.2
1.0
0.8
0.6
0.4
DROPOUT VOLTAGE (V)
0.2
INDICATES GUARANTEED TEST POINT
0
100 400 600 800
0
200 300 500 700
OUTPUT CURRENT (mA)
TJ = 25°C
TJ = 125°C
)
OUT
LT1117 • TPC01
1
Page 2
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
A
W
O
LUTEXI T
S
A
WUW
ARB
Input Voltage
Operating Voltage
LT1117, LT1117-3.3, LT1117-5 ...................... 15V
LT1117-2.85 ................................................... 10V
Surge Voltage
LT1117, LT1117-3.3, LT1117-5 ...................... 20V
/
PACKAGE
O
RDER I FOR ATIO
ORDER PART
FRONT VIEW
TAB IS
V
OUT
ST PACKAGE
3-LEAD PLASTIC SOT-223
3
IN
2
OUT
1
ADJ/GND
NUMBER
LT1117CST
LT1117CST-2.85
LT1117CST-3.3
LT1117CST-5
PART MARKING
1117
T
= 125°C,θ
J MAX
Consult factory for Industrial and Military grade parts.
= 15°C/W
JC
11172
U
G
S
I
Operating JunctionTemperature Range ..... 0°C to 125°C
Storage Temperature Range .................– 65°C to 150°C
Lead Temperature................... (See Soldering Methods)
WU
11173
11175
U
TAB IS
V
OUT
FRONT VIEW
M PACKAGE
3-LEAD PLASTIC DD
T
= 125°C,θ
J MAX
3
2
1
= 10°C/W
JC
IN
OUT
ADJ/GND
ORDER PART
NUMBER
LT1117CM
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5
PART MARKING
1117
11172
11173
11175
LECTRICAL C CHARA TERIST
E
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage LT1117 I
Output Voltage LT1117-2.85 I
LT1117-3.3 I
LT1117-5 I
Line Regulation LT1117 I
LT1117-2.85 I
LT1117-3.3 I
LT1117-5 I
Load Regulation LT1117 (VIN – V
LT1117-2.85 V
LT1117-3.3 V
LT1117-5 V
Dropout Voltage I
Current Limit (VIN – V
Minimum Load Current LT1117 (VIN – V
ICS
= 10mA, (VIN – V
OUT
10 ≤ I
0 ≤ I
0 ≤ I
0 ≤ I
0 ≤ I
I
I
≤ 800mA, 1.4V ≤ (VIN - V
OUT
= 10mA, VIN = 4.85V, TJ = 25°C 2.820 2.850 2.880 V
OUT
≤ 800mA, 4.25V ≤ VIN ≤ 10V ● 2.790 2.850 2.910 V
OUT
≤ 500mA, VIN = 3.95V ● 2.790 2.850 2.910 V
OUT
= 10mA, VIN = 5V, TJ = 25°C 3.267 3.300 3.333 V
OUT
≤ 800mA, 4.75V ≤ VIN ≤ 10V ● 3.235 3.300 3.365 V
OUT
= 10mA, VIN = 7V, TJ = 25°C 4.950 5.000 5.050 V
OUT
≤ 800mA, 6.50V ≤ VIN ≤ 12V ● 4.900 5.000 5.100 V
OUT
= 10mA, 1.5V ≤ VIN – V
OUT
= 0mA, 4.25V ≤ VIN ≤ 10V (Note 1) ● 16 mV
OUT
= 0mA, 4.75V ≤ VIN ≤ 15V (Note 1) ● 16 mV
OUT
= 0mA, 6.5V ≤ VIN ≤ 15V (Note 1) ● 110 mV
OUT
) = 3V, 10mA ≤ I
OUT
= 4.25V, 0 ≤ I
IN
= 4.75V, 0 ≤ I
IN
= 6.5V, 0 ≤ I
IN
= 100mA (Note 2) ● 1.00 1.10 V
OUT
= 500mA (Note 2) ● 1.05 1.15 V
OUT
= 800mA (Note 2) ● 1.10 1.20 V
OUT
OUT
) = 5V, TJ = 25°C, 800 950 1200 mA
OUT
) = 15V (Note 3) ● 1.7 5 mA
OUT
) = 2V, TJ = 25°C 1.238 1.250 1.262 V
OUT
OUT
OUT
≤ 800mA (Note 1) ● 110 mV
OUT
≤ 800mA (Note 1) ● 110 mV
OUT
≤ 800mA (Note 1) ● 115 mV
) ≤ 10V ● 1.225 1.250 1.270 V
OUT
≤ 15V (Note 1) ● 0.035 0.2 %
≤ 800mA (Note 1) ● 0.1 0.4 %
2
Page 3
LT1117/LT1117-2.85
TEMPERATURE (°C)
–50
–0.20
OUTPUT VOLTAGE DEVIATION (%)
–0.15
–0.10
–0.05
0.10
50 75 125
LT1117 • TPC04
0
0.05
0
–25 25 100
∆ I
LOAD
= 800mA
LT1117-3.3/LT1117-5
LECTRICAL C CHARA TERIST
E
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current LT1117-2.85 VIN ≤ 10V ● 510 mA
LT1117-3.3 V
LT1117-5 V
Thermal Regulation TA = 25°C, 30ms Pulse 0.01 0.1 %/W
Ripple Rejection f
Adjust Pin Current ● 55 120 µA
Adjust Pin Current Change 10mA ≤ I
Temperature Stability 0.5 %
Long Term Stability TA = 125°C, 1000Hrs 0.3 %
RMS Output Noise (% of V
Thermal Resistance (Junction-to-Case, at Tab) 15 °C/W
ICS
≤ 15V ● 510 mA
IN
≤ 15V ● 510 mA
IN
= 120Hz, (VIN – V
RIPPLE
= 1Vp-p ● 60 75 dB
V
RIPPLE
≤ 800mA, 1.4V ≤ (VIN – V
OUT
), 10Hz ≤ f ≤ 10kHz 0.003 %
OUT
OUT
) = 3V,
) ≤ 10V ● 0.2 5 µA
OUT
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: 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 2: 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 3: Minimum load current is defined as the minimum output current
required to maintain regulation.
UW
Y
PICA
4
3
2
1
MINIMUM OPERATING CURRENT (mA)
0
LPER
F
O
R
AT
CCHARA TERIST
E
C
ICS
Minimum Operating Current
(Adjustable Device) Short-Circuit Current Load Regulation
1.25
TJ = 125°C
TJ = 25°C
10 15
LT1117 • TPC03
0
5
INPUT/OUTPUT DIFFERENTIAL (V)
10 15 20
TJ = 125°C
TJ = 25°C
TJ = –55°C
LT1117 • TPC02
1.00
0.75
0.50
0.25
SHORT CIRCUIT CURRENT (A)
0
0
5
INPUT/OUTPUT DIFFERENTIAL (V)
3
Page 4
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
Y
PICA
LPER
F
O
R
AT
UW
CCHARA TERIST
E
C
ICS
LT1117 Ripple Rejection LT1117 Ripple Rejection vs Current Temperature Stability
100
90
80
70
60
50
40
30
RIPPLE REJECTION (dB)
20
10
0
V
≤ 3V
RIPPLE
C
= 200µF AT f < 60Hz
ADJ
= 25µF AT f > 60Hz
C
ADJ
= 0.5A
I
OUT
10 1k 10k 100k
100
P-P
(VIN – V
FREQUENCY (Hz)
(VIN – V
OUT)
≥ V
V
RIPPLE
0.5V
OUT)
DROPOUT
≤
P-P
≥ 3V
LT1117 • TPC05
100
90
80
70
60
50
40
30
RIPPLE REJECTION (dB)
V
= 5V
OUT
20
10
0
= 25µF
C
ADJ
= 25µF
C
OUT
0.2 0.4 0.6 0.8
0
OUTPUT CURRENT (A)
V
RIPPLE
V
RIPPLE
f
RIPPLE
≤ 3V
f
RIPPLE
≤ 0.5V
= 120Hz
P-P
= 20kHz
P-P
LT1117 • TPC06
2.0
1.0
0
–1.0
OUTPUT VOLTAGE CHANGE (%)
–2.0
–25 25 75 125
–50
0 50 100 150
TEMPERATURE (°C)
LT1117-2.85 LT1117-5
Adjust Pin Current Load Transient Response Load Transient Response
100
90
80
70
60
50
40
30
AJUST PIN CURRENT (µA)
20
10
0
–25 25 75 125
–50
0 50 100 150
TEMPERATURE (°C)
LT1117 • TPC08
0.3
0.2
0.1
0
DEVIATION (V)
OUPUT VOLTAGE
–0.1
–0.2
0.5
0
(A)
–0.5
LOAD CURRENT
10 30 60 80
0
CIN = 10µF
= 10µF TANTALUM
C
OUT
= 4.25V
V
IN
PRELOAD = 0.1A
40 90
20 50 70 100
TIME (µs)
LT1117 • TPC09
0.3
0.2
0.1
0
DEVIATION (V)
OUPUT VOLTAGE
–0.1
–0.2
0.5
0
(A)
–0.5
LOAD CURRENT
10 30 60 80
0
CIN = 10µF
C
OUT
= 6.5V
V
IN
PRELOAD = 0.1A
40 90
20 50 70 100
TIME (µs)
LT1117 • TPC07
= 10µF TANTALUM
LT1117 • TPC10
4
LT1117-2.8
Line Transient Response
60
CIN = 1µF
= 10µF TANTALUM
C
40
OUT
= 0.1A
I
OUT
20
0
DEVIATION (mV)
OUPUT VOLTAGE
–20
–40
5.25
4.25
(V)
3.25
INPUT VOLTAGE
20 60 120 160
40 100 140 200
0
80 180
TIME (µs)
LT1117 • TPC11
LT1117-5
Line Transient Response
60
40
20
DEVIATION (mV)
OUPUT VOLTAGE
–20
–40
7.50
6.50
(V)
5.50
INPUT VOLTAGE
CIN = 1µF
= 10µF TANTALUM
C
OUT
= 0.1A
I
OUT
0
20 60 120 160
40 100 140 200
0
80 180
TIME (µs)
LT1117 • TPC12
Page 5
BLOCK
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
W
IDAGRA
IN
+
–
THERMAL
LIMIT
ADJ
GND FOR FIXED VOLTAGE DEVICE
HI
U
TS
U
O
PPLICATI
A
The LT1117 family of three-terminal regulators are easy to
use. They are protected against short circuit and thermal
overloads. Thermal protection circuitry will shutdown the
regulator should the junction temperature exceed 165°C
at the sense point. These regulators are pin compatible
with older three-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.
OUT
LT1117 • BD01
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
5
Page 6
LT1117/LT1117-2.85
R
RR
R
R
PP
×
+
=
21
1
, Parasitic Line Resistance
LT1117-3.3/LT1117-5
PPLICATI
A
O
U
HI
U
TS
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.
D1
1N4002
(OPTIONAL)
LT1117
V
IN
IN
+
ADJ
OUT
C
ADJ
10µF
R1
R2
+
V
OUT
C
OUT
150µF
LT1117 • TA02
to set the overall output voltage. Normally this current is
chosen to be the specified minimum load current of 10mA.
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.
Load Regulation
Because the LT1117 is a three-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:
Figure 1.
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
LT1117
V
IN
IN
I
50µA
V
= V
OUT
OUT
ADJ
ADJ
1 + + I
REF
()
V
REF
R2
—
R1
ADJ
R2
Figure 2. Basic Adjustable Regulator
V
OUT
R1
R2
LT1117 • TA03
RP
LT1117
V
IN
IN
ADJ
LINE RESISTANCE
OUT
PARASITIC
R1
CONNECT
R1 TO CASE
R2
CONNECT
R2 TO LOAD
RL
LT1117 • TA04
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.
6
Page 7
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
HI
U
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THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
U
O
PPLICATI
A
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.
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
TOPSIDE* BACKSIDE BOARD AREA
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:
PD = ( VIN – V
Maximum junction temperature will be equal to:
TJ =T
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 100Ω-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
(V
OUT/VREF
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.
). For example, with the output voltage equal to
)( I
OUT
+ PD(Thermal Resistance (junction-to-
OUT
)
7
Page 8
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
PPLICATITYPICAL
O
U
SA
1.2V to 10V Adjustable Regulator
LT1117
C2
100µF
LT1117 • TA05
†
V
OUT
IN
TTL
V
IN
+
†
IN
C1*
10µF
NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS*
V
= 1.25V 1 +
OUT
OUT
ADJ
R1
121Ω
+
R2
1k
R2
—
()
R1
5V Regulator with Shutdown
LT1117
IN
+
10µF
1k
1k
OUT
ADJ
2N3904
121Ω
1%
365Ω
1%
5VV
+
100µF
LT1117 • TA06
Remote Sensing
RP
(MAX. DROP 300mV)
V
IN
7
6
LM301A
1
8
4
100pF
OUTPUT
5V
2
–
1k
3
+
5µF
R
L
+
25Ω
RETURN
LT1117 • TA07
V
RETURN
LT1117
IN
IN
+
10µF
ADJ
OUT
100µF
121Ω
365Ω
+
25Ω
8
Adjusting Output Voltage of Fixed Regulators
LT1117-5
IN
> 12V
10µF
+
IN
OUT
GND
5V TO 10VV
+
100µF
+
10µF*
* OPTIONAL IMPROVES RIPPLE REJECTION
1k
LT1117 • TA08
> 11.5V
IN
Regulator with Reference
LT1117-5
IN
+
10µF
GND
OUT
5V
OUT
LT1029
+
10VV
100µF
LT1117 • TA09
Page 9
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
O
PPLICATITYPICAL
Battery Charger Battery Backed Up Regulated Supply
SA
LT1117
V
IN
IN
Improving Ripple Rejection Automatic Light Control
LT1117
IN
10µF
*C1 IMPROVES RIPPLE
REJECTION. X
≈ R1 AT RIPPLE FREQUENCY
IN
+
ADJ
SHOULD BE
C
ADJ
1.25V
OUT
365Ω
1%
IF =
∆V
R2
∆IF
OUT
OUT
IF
V
R
S
R1
V
– 1.25V 1 +
OUT
–RS 1 +
()
=
–RS 1 +
()
R1
121Ω
1%
+
OUT
R2
—
()
R1
R2
—
R1
1
R2
—
R1
LT1117 • TA10
VIN ≥ 16.5VV
150µF
C1
10µF
LT1117 • TA14
V
IN
6.5V
SELECT FOR
CHARGE RATE
+
10µF
10µF
10µF
LT1117-5
+
IN
IN
LT1117
IN
ADJ
OUT
GND
50Ω
LT1117-5
OUT
GND
OUT
1.2k
++
5.2V LINE
5.0V BATTERY
100µF
LT1117 • TA13
100µF
LT1117 • TA16
FEEDBACK PATH
+V
IN
SWITCHING
REGULATOR
High Efficiency Dual Supply
MUR410
3.3V OUTPUT (TYPICAL)
+
470µF
MUR410
+
MUR410
+
LT1117-5
IN
GND
470µF
LT1117-5
IN
GND
470µF
OUT
OUT
+
10µF 1N4002
+
10µF
+5V
0.5A
1N4002
–5V
0.5A
LT1117 • TA12
9
Page 10
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
PPLICATITYPICAL
O
U
SA
High Efficiency Dual Linear Supply
(DARLINGTON)
MDA201
130VAC-
90VAC
MDA
*
L1
STANCOR
P-8685
(DARLINGTON)
MDA201
= 1 % FILM RESISTORS
= MOTOROLA
= PULSE ENGINEERING, INC. #PE-92106
(HEAT SINK)
2N6667
+
–
(HEAT SINK)
2N6667
+
–
L1
285µH
MBR360
Q1
10k
+
4700µF
+
510k1k
+
V
LT1018
1/2
1000µF
+
2.4k
30k
LT1117-5
IN
GND
LT1004-2.5
20k* 30.1k*
OUT
+5V
0.5A
+
100µF
D11
1N4002
–
L1
285µH
MBR360
10k
+
4700µF
+
510k1k
LT1018
–
V
1/2
1000µF
+
–
2.4k
30k
LT1117-5
IN
GND
LT1004-2.5
20k* 30.1k*
OUT
+
100µF
D2
1N4002
–5V
0.5A
LT1117 • TA11
10
V
IN
FLOATING INPUT
Low Dropout Negative Supply
LT1117-5
IN
+
10µF
OUT
GND
+
100µF
V
= –5V
OUT
LT1117 • TA17
Page 11
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
O
PPLICATITYPICAL
SA
High Efficiency Regulator
MR1122
1M
LT1011
1mH
+
–
10,000µF
+
28V
1N914
28V INPUT
10k
1k
UW
SOLDERI G
The SOT-223 is manufactured with gull wing leadform for
surface mount applications. The leads and heatsink are
solder plated and allow easy soldering using non-active or
mildly active fluxes. The package is constructed with three
leads exiting one side of the package and one heatsink
exiting the other side, and the die attached to the heatsink
internally.
ETHODS
4N28
10k
10k
470Ω
1N914
IN
28V
LT1117
ADJ
OUT
240Ω
2k
OUTPUT
ADJUST
+
LT1117 • TA15
OUTPUT
100µF
The recommended methods of soldering SOT-223 are:
vapor phase reflow and infrared reflow with preheat of
component to within 65°C of the solder temperature.
Hand soldering and wave soldering are not recommended since these methods can easily damage the
part with excessive thermal gradients across the package.
Care must be exercised during surface mount to minimize
large (> 30°C per second) thermal shock to the package.
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LT1117 • TA18
11
Page 12
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
PACKAGEDESCRIPTI
O
U
Dimensions in inches (millimeters) unless otherwise noted.
M Package
3-Lead Plastic DD
0.060
(1.524)
+0.012
0.331
–0.020
+0.305
8.407
()
–0.508
+0.012
0.143
–0.020
+0.305
3.632
()
–0.508
0.264 – 0.287
(6.71 – 7.29)
0.130 – 0.146
(3.30 – 3.71)
0.090
(2.29)
NOM
0.050 ± 0.008
(1.270 ± 0.203)
0.248 – 0.264
(6.30 – 6.71)
0.116 – 0.124
(2.95 – 3.15)
0.401 ± 0.015
(10.185 ± 0.381)
15° TYP
0.100 ± 0.010
(2.5402 ± 0.254)
0.175 ± 0.008
(4.445 ± 0.203)
0.022 ± 0.005
(0.559 ± 0.127)
ST Package
3-Lead Plastic SOT-223
0.071
(1.80)
MAX
0.033 – 0.041
(0.84 – 1.04)
0.025 – 0.033
(0.64 – 0.84)
0.059
(1.499)
TYP
0.181
(4.60)
NOM
0.050 ± 0.008
(1.270 ± 0.203)
+0.008
0.004
–0.004
+0.203
0.102
()
–0.102
0.105 ± 0.008
(2.667 ± 0.203)
0.050 ± 0.012
(1.270 ± 0.305)
10°
MAX
0.012
(0.31)
MIN
10° – 16°
0.0008 – 0.0040
(0.0203 – 0.1016)
DD3 0693
0.010 – 0.014
(0.25 – 0.36)
10° – 16°
SOT233 0793
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
●
FAX
: (408) 434-0507
●
TELEX
: 499-3977
LT/GP 0993 5K REV B
LINEAR TECHNOLOGY CORPORATION 1993
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