Linear Technology LT1117CST, LT1117CM-5, LT1117CM-3.3, LT1117CM-2.85, LT1117IST-5 Datasheet
...
FEATURES
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Positive Regulators
Adjustable and Fixed 2.85V,
3.3V, 5V
U
DESCRIPTIO
■
Space Saving SOT-223 Surface Mount Package
■
3-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
U
APPLICATIO S
■
Active SCSI Terminators
■
High Efficiency Linear Regulators
■
Post Regulators for Switching Supplies
■
Battery Chargers
■
5V to 3.3V Linear Regulators
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 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Active Terminator for SCSI-2 Bus
LT1117-2.85
4.75V TO
5.25V
IN
+ +
10µF
OUT
GND
U
22µF
110Ω
110Ω
110Ω
110Ω
LT1117 • TA01
18 TO 27
LINES
Dropout Voltage (VIN – V
1.4
1.2
1.0
0.8
0.6
0.4
DROPOUT VOLTAGE (V)
0.2
0
TJ = 25°C
TJ = 125°C
INDICATES GUARANTEED TEST POINT
100 400 600 800
0
200 300 500 700
–40°C ≤ TJ < 0°C
0°C ≤ T
OUTPUT CURRENT (mA)
≤ 125°C
J
)
OUT
LT1117 • TPC01
1
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
WWWU
ABSOLUTE AXI U RATI GS
(Note 1)
Input Voltage
Operating Voltage
LT1117, LT1117-3.3, LT1117-5 ...................... 15V
LT1117-2.85 ................................................... 10V
Surge Voltage
LT1117, LT1117-3.3, LT1117-5 ...................... 20V
UU
W
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
LT1117CST
LT1117CST-2.85
FRONT VIEW
3
IN
TAB IS
V
OUT
ST PACKAGE
3-LEAD PLASTIC SOT-223
T
= 125°C,θ
J MAX
Consult factory for Military grade parts.
2
1
= 15°C/W
JC
OUT
ADJ/GND
LT1117CST-3.3
LT1117CST-5
LT1117IST
LT1117IST-2.85
LT1117IST-3.3
LT1117IST-5
ST PART MARKING
1117
11172
11173
11175
1117I
11172I
11173I
11175I
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)
ORDER PART
NUMBER
LT1117CM
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5
DD PART MARKING
TAB IS
V
OUT
T
J MAX
FRONT VIEW
3
2
1
M PACKAGE
3-LEAD PLASTIC DD
= 125°C,θ
= 10°C/W
JC
IN
OUT
ADJ/GND
1117
11172
11173
11175
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
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
= 10mA, (VIN – V
OUT
10 ≤ I
0 ≤ I
0 ≤ I
0 ≤ I
0 ≤ 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 2) ● 16 mV
OUT
= 0mA, 4.75V ≤ VIN ≤ 15V (Note 2) ● 16 mV
OUT
= 0mA, 6.5V ≤ VIN ≤ 15V (Note 2) ● 110 mV
OUT
) = 2V, TJ = 25°C 1.238 1.250 1.262 V
OUT
OUT
) ≤ 10V ● 1.225 1.250 1.270 V
OUT
≤ 15V (Note 2) ● 0.035 0.2 %
2
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
LECTRICAL C CHARA TERIST
E
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Load Regulation LT1117 (VIN – V
LT1117-2.85 V
LT1117-3.3 V
LT1117-5 VIN = 6.5V, 0 ≤ I
Dropout Voltage I
Current Limit (VIN – V
Minimum Load Current LT1117 (VIN – V
Quiescent Current LT1117-2.85 VIN ≤ 10V ● 510 mA
LT1117-3.3 V
LT1117-5 VIN ≤ 15V ● 510 mA
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
) = 3V, 10mA ≤ I
OUT
= 4.25V, 0 ≤ I
IN
= 4.75V, 0 ≤ I
IN
= 100mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.00 1.10 V
OUT
= 500mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.05 1.15 V
I
OUT
I
= 800mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.10 1.20 V
OUT
I
= 100mA, –40°C ≤ TJ < 0°C (Note 3) 1.00 1.20 V
OUT
= 500mA, –40°C ≤ TJ < 0°C (Note 3) 1.05 1.25 V
I
OUT
I
= 800mA, –40°C ≤ TJ < 0°C (Note 3) 1.10 1.30 V
OUT
) = 5V, TJ = 25°C, 800 950 1200 mA
OUT
) = 15V (Note 4) ● 1.7 5 mA
OUT
≤ 15V ● 510 mA
IN
= 120Hz, (VIN – V
RIPPLE
OUT
), 10Hz ≤ f ≤ 10kHz 0.003 %
OUT
≤ 800mA (Note 2) ● 110 mV
OUT
≤ 800mA (Note 2) ● 110 mV
OUT
≤ 800mA (Note 2) ● 115 mV
OUT
≤ 800mA, 1.4V ≤ (VIN – V
≤ 800mA (Note 2) ● 0.1 0.4 %
OUT
) = 3V, V
OUT
= 1V
RIPPLE
OUT
P-P
) ≤ 10V ● 0.2 5 µA
● 60 75 dB
Note 1: Absolute Maximum Ratings are those values beyond which the life
to the device may be imparied.
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.
UW
LPER
F
O
R
ATYPICA
Minimum Operating Current
(Adjustable Device) Short-Circuit Current Load Regulation
4
3
2
1
MINIMUM OPERATING CURRENT (mA)
0
0
5
INPUT/OUTPUT DIFFERENTIAL (V)
TJ = 125°C
TJ = 25°C
TJ = –55°C
10 15 20
LT1117 • TPC02
CCHARA TERIST
E
C
1.25
1.00
0.75
0.50
0.25
SHORT CIRCUIT CURRENT (A)
0
0
INPUT/OUTPUT DIFFERENTIAL (V)
ICS
0.10
∆ I
LOAD
TJ = 125°C
TJ = 25°C
5
10 15
LT1117 • TPC03
0.05
0
–0.05
–0.10
–0.15
OUTPUT VOLTAGE DEVIATION (%)
–0.20
–50
= 800mA
0
–25 25 100
TEMPERATURE (°C)
50 75 125
LT1117 • TPC04
3
LT1117/LT1117-2.85
TEMPERATURE (°C)
–50
–2.0
OUTPUT VOLTAGE CHANGE (%)
–1.0
0
2.0
0 50 100 150
LT1117 • TPC07
1.0
–25 25 75 125
LT1117-3.3/LT1117-5
UW
LPER
F
O
R
ATYPICA
LT1117 Ripple Rejection LT1117 Ripple Rejection vs Current Temperature Stability
100
90
80
70
60
50
40
30
RIPPLE REJECTION (dB)
20
10
0
10 1k 10k 100k
V
RIPPLE
C
= 200µF AT f < 60Hz
ADJ
= 25µF AT f > 60Hz
C
ADJ
= 0.5A
I
OUT
100
≤ 3V
P-P
(VIN – V
FREQUENCY (Hz)
(VIN – V
OUT)
≥ V
V
RIPPLE
0.5V
P-P
OUT)
DROPOUT
LT1117 • TPC05
≤
≥ 3V
Adjust Pin Current Load Transient Response Load Transient Response
100
90
80
70
60
50
40
30
AJUST PIN CURRENT (µA)
20
10
0
–50
–25 25 75 125
0 50 100 150
TEMPERATURE (°C)
LT1117 • TPC08
CCHARA TERIST
E
C
100
V
= 5V
OUT
90
= 25µF
C
ADJ
= 25µF
C
OUT
80
70
60
50
40
30
RIPPLE REJECTION (dB)
20
10
0
0
0.2 0.4 0.6 0.8
LT1117-2.85 LT1117-5
0.3
CIN = 10µF
= 10µF TANTALUM
C
0.2
OUT
= 4.25V
V
IN
PRELOAD = 0.1A
0.1
0
DEVIATION (V)
OUPUT VOLTAGE
–0.1
–0.2
0.5
0
(A)
–0.5
LOAD CURRENT
0
10 30 60 80
20 50 70 100
ICS
f
RIPPLE
V
≤ 3V
RIPPLE
f
RIPPLE
V
≤ 0.5V
RIPPLE
OUTPUT CURRENT (A)
40 90
TIME (µs)
= 120Hz
P-P
= 20kHz
P-P
LT1117 • TPC06
LT1117 • TPC09
0.3
CIN = 10µF
C
OUT
0.2
= 6.5V
V
IN
PRELOAD = 0.1A
0.1
0
DEVIATION (V)
OUPUT VOLTAGE
–0.1
–0.2
0.5
0
(A)
–0.5
LOAD CURRENT
0
10 30 60 80
= 10µF TANTALUM
20 50 70 100
40 90
TIME (µs)
LT1117 • TPC10
4
LT1117-2.8
Line Transient Response
60
CIN = 1µF
= 10µF TANTALUM
C
OUT
40
= 0.1A
I
OUT
20
0
DEVIATION (mV)
OUPUT VOLTAGE
–20
–40
5.25
4.25
(V)
3.25
INPUT VOLTAGE
0
20 60 120 160
40 100 140 200
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
0
20 60 120 160
40 100 140 200
80 180
TIME (µs)
LT1117 • TPC12
BLOCK DIAGRA
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
W
IN
+
–
THERMAL
LIMIT
ADJ
GND FOR FIXED VOLTAGE DEVICE
UU
APPLICATIO HI TS
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.
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.
5
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
UU
APPLICATIO HI TS
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.
D1
1N4002
(OPTIONAL)
LT1117
V
IN
IN
ADJ
+
OUT
C
ADJ
10µF
+
R1
R2
Figure 1
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 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:
RR
×
+=21
R
, Parasitic Line Resistance
R
1
R
PP
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
OUT
OUT
ADJ
ADJ
= V
1 + + I
REF
()
V
REF
R2
—
R1
ADJ
R2
V
OUT
R1
R2
LT1117 • TA03
Figure 2. Basic Adjustable Regulator
6
R
P
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.
UU
APPLICATIO HI TS
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
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
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
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
OUT
)( I
OUT
)
Maximum junction temperature will be equal to:
TJ =T
+ PD(Thermal Resistance (junction-to-
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 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
(V
OUT/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.
7
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATIO S
1.2V to 10V Adjustable Regulator 5V Regulator with Shutdown
U
LT1117
C2
100µF
LT1117 • TA05
†
V
OUT
IN
+
10µF
TTL
1k
V
IN
+
NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS*
†
V
OUT
IN
C1*
10µF
= 1.25V 1 +
OUT
ADJ
R2
1k
R2
—
()
R1
R1
121Ω
+
LT1117
+
LT1117 • TA06
5VV
100µF
IN
1k
ADJ
2N3904
OUT
121Ω
1%
365Ω
1%
Remote Sensing
R
P
(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
25Ω
121Ω
365Ω
8
Adjusting Output Voltage of Fixed Regulators
LT1117-5
IN
> 12V
10µF
+
IN
OUT
GND
5V TO 10VV
+
100µF
+
10µF* 1k
* OPTIONAL IMPROVES RIPPLE REJECTION
LT1117 • TA05
> 11.5V
IN
Regulator with Reference
LT1117-5
IN
10µF
GND
OUT
5V
LT1029
10VV
++
100µF
OUT
LT1117 • TA06
TYPICAL APPLICATIO S
Battery Charger Battery Backed Up Regulated Supply
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
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
OUT
1.25V
365Ω
1%
LT1117
ADJ
IN
IN
OUT
LT1117-5
GND
LT1117-5
GND
50Ω
OUT
OUT
1.2k
5.2V LINE
5.0V BATTERY
++
100µF
LT1117 • TA08
100µF
LT1117 • TA10
IF
OUT
R
R1
V
– 1.25V 1 +
OUT
IF =
–R
S
∆IF
=
∆V
OUT
–RS 1 +
R1
121Ω
1%
R2
+
V
S
1 +
()
()
OUT
R2
—
()
R1
R2
—
R1
1
R2
—
LT1117 • TA07
R1
VIN ≥ 16.5VV
150µF
C1
10µF
LT1117 • TA09
V
IN
6.5V
10µF
+
10µF
SELECT FOR
CHARGE RATE
10µF
IN
+
FEEDBACK PATH
+V
IN
SWITCHING
REGULATOR
High Efficiency Dual Supply
MUR410
3.3V OUTPUT (TYPICAL)
+
470µF
MUR410
+
MUR410
+
IN
470µF
IN
470µF
LT1117-5
OUT
GND
LT1117-5
OUT
GND
+
10µF 1N4002
+
10µF
+5V
0.5A
1N4002
–5V
0.5A
LT1117 • TA11
9
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATIO S
U
High Efficiency Dual Linear Supply
130VAC
TO 90VAC
(DARLINGTON)
MDA201
STANCOR
P-8685
MDA201
(HEAT SINK)
2N6667
+
–
(HEAT SINK)
2N6667
(DARLINGTON)
+
–
MDA
L1
285µH
MBR360
Q1
10k
+
4700µF
L1
285µH
MBR360
10k
+
4700µF
= 1 % FILM RESISTORS
*
= MOTOROLA
= PULSE ENGINEERING, INC. #PE-92106
L1
+
510k1k
+
V
LT1018
+
510k1k
LT1018
–
V
1/2
1/2
1000µF
+
–
1000µF
+
–
2.4k
30k
2.4k
30k
LT1117-5
IN
GND
LT1004-2.5
20k* 30.1k*
LT1117-5
IN
GND
LT1004-2.5
20k* 30.1k*
OUT
OUT
5V
0.5A
+
100µF
+
100µF
D11
1N4002
D2
1N4002
–5V
0.5A
LT1117 • TA12
10
V
IN
FLOATING INPUT
Low Dropout Negative Supply
LT1117-5
IN
10µF
OUT
GND
++
100µF
V
= –5V
OUT
LT1117 • TA13
WU
SOLDERI G ETHODS
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
The SOT-223 is manufactured with gull wing leadform for
surface mount applications. The leads and heat sink are
solder plated and allow easy soldering using nonactive or
mildly active fluxes. The package is constructed with three
leads exiting one side of the package and one heat sink
exiting the other side, and the die attached to the heat sink
internally.
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
U
PACKAGE DESCRIPTIO
0.256
(6.502)
0.060
(1.524)
0.300
(7.620)
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
0.060
(1.524)
0.075
(1.905)
0.183
(4.648)
Dimensions in inches (millimeters) unless otherwise noted.
M Package
3-Lead Plastic DD Pak
(LTC DWG # 05-08-1460)
0.060
(1.524)
TYP
0.330 – 0.370
(8.382 – 9.398)
+0.012
0.143
–0.020
+0.305
3.632
()
–0.508
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.
LT1117 • TA15
0.390 – 0.415
0.050
(1.270)
BSC
(9.906 – 10.541)
15
0.090 – 0.110
(2.286 – 2.794)
° TYP
0.165 – 0.180
(4.191 – 4.572)
0.059
(1.499)
TYP
0.013 – 0.023
(0.330 – 0.584)
0.045 – 0.055
(1.143 – 1.397)
+0.008
0.004
–0.004
+0.203
0.102
()
–0.102
0.095 – 0.115
(2.413 – 2.921)
± 0.012
0.050
(1.270 ± 0.305)
M (DD3) 1098
0.264 – 0.287
(6.70 – 7.30)
0.130 – 0.146
(3.30 – 3.71)
0.0905
(2.30)
NOM
ST Package
3-Lead Plastic SOT-223
0.248 – 0.264
(6.30 – 6.71)
0.114 – 0.124
(2.90 – 3.15)
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.
(LTC DWG # 05-08-1630)
0.071
(1.80)
MAX
0.024 – 0.033
(0.60 – 0.84)
0.181
(4.60)
NOM
0.033 – 0.041
(0.84 – 1.04)
0.012
(0.31)
MIN
10°
MAX
10° – 16°
0.0008 – 0.0040
(0.0203 – 0.1016)
10° – 16°
ST3 (SOT-233) 1298
0.010 – 0.014
(0.25 – 0.36)
11
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL APPLICATIO
U
High Efficiency Regulator
470Ω
1N914
IN
28V
LT1117
ADJ
OUT
240Ω
2k
OUTPUT
ADJUST
+
LT1117 • TA14
OUTPUT
100µF
28V INPUT
10k
1mH
+
LT1011
10,000µF
+
–
28V
4N28
10k
10k
1N914
MR1122
1k
1M
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1120 125mA Low Dropout Regulator with 20µA I
Q
LT1121 150mA Micropower Low Dropout Regulator 30µA IQ, SOT-223 Package
LT1129 700mA Micropower Low Dropout Regulator 50µA Quiescent Current
LT1175 500mA Negative Low Dropout Micropower Regulator 45µA IQ, 0.26V Dropout Voltage, SOT-223 Package
LT1374 4.5A, 500kHz Step-Down Converter 4.5A, 0.07Ω Internal Switch, SO-8 Package
LT1521 300mA Low Dropout Micropower Regulator with Shutdown 15µA IQ, Reverse Battery Protection
LT1573 UltraFastTM Transient Response Low Dropout Regulator Drives External PNP
LT1575 UltraFast Transient Response Low Dropout Regulator Drives External N-Channel MOSFET
LT1735 Synchronous Step-Down Converter High Efficiency, OPTI-LOOPTM Compensation
LT1761 Series 100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23 20µA Quiescent Current, 20µV
LT1762 Series 150mA, Low Noise, LDO Micropower Regulators 25µA Quiescent Current, 20µV
LT1763 Series 500mA, Low Noise, LDO Micropower Regulators 30µA Quiescent Current, 20µV
LT1764 Series 3A, Low Noise, Fast Transient Response LDO 40µV
LT1962 300mA, Low Noise, LDO Micropower Regulator 20µV
LT1963 1.5A, Low Noise, Fast Transient Response LDO 40µV
UltraFast and OPT-LOOP are trademarks of Linear Technology Corporation.
Includes 2.5V Reference and Comparator
Noise, SOT-23 Package
RMS
Noise, MSOP Package
RMS
Noise, SO-8 Package
RMS
Noise, DD and TO-220 Packages
RMS
Noise, MSOP Package
RMS
Noise, SOT-223 Package
RMS
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear-tech.com
1117fc LT/TP 0500 2K REV C • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993
Loading...