LT1117CST-3.3 [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： | LT1117CST-3.3 |
| 厂家： | 
Linear |
| 描述： | 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V |
| 文件： | 总12页 (文件大小：283K) |
| 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
U
DESCRIPTIO
EATURE
S
F
■
■
■
■
■
■
■
The LT1117 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
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.
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
O U
PPLICATI
A
S
■
■
■
■
■
Active SCSI Terminators
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Battery Chargers
The low profile surface mount SOT-223 package allows
the device to be used in applications where space is
limited.TheLT1117requiresaminimumof10µFofoutput
capacitance for stability. Output capacitors of this size or
larger are normally included in most regulator designs.
5V to 3.3V Linear Regulators
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.
U
O
TYPICAL APPLICATI
Active Terminator for SCSI-2 Bus
Dropout Voltage (VIN – VOUT)
1.4
1.2
1.0
110Ω
110Ω
110Ω
T = 25°C
J
LT1117-2.85
18 TO 27
LINES
IN
OUT
T = 125°C
0.8
0.6
0.4
0.2
0
J
GND
+
+
4.75V TO
5.25V
110Ω
10µF
22µF
LT1117 • TA01
INDICATES GUARANTEED TEST POINT
0
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
LT1117 • TPC01
1
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
W W W
U
ABSOLUTE AXI U RATI GS
Input Voltage
Operating JunctionTemperature Range ..... 0°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature................... (See Soldering Methods)
Operating Voltage
LT1117, LT1117-3.3, LT1117-5 ...................... 15V
LT1117-2.85 ................................................... 10V
Surge Voltage
LT1117, LT1117-3.3, LT1117-5 ...................... 20V
W U
/O
PACKAGE RDER I FOR ATIO
ORDER PART
NUMBER
LT1117CST
LT1117CST-2.85
LT1117CST-3.3
LT1117CST-5
ORDER PART
NUMBER
LT1117CM
LT1117CM-2.85
LT1117CM-3.3
LT1117CM-5
FRONT VIEW
FRONT VIEW
3
2
IN
3
2
1
IN
TAB IS
OUT
TAB IS
OUT
OUT
V
OUT
V
ADJ/GND
1
ADJ/GND
ST PACKAGE
3-LEAD PLASTIC SOT-223
M PACKAGE
3-LEAD PLASTIC DD
PART MARKING
PART MARKING
1117
11172
11173
11175
1117
11172
11173
11175
TJ MAX = 125°C,θJC = 10°C/W
TJ MAX = 125°C,θJC = 15°C/W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage
LT1117
I
= 10mA, (V – V ) = 2V, T = 25°C
1.238 1.250 1.262
1.225 1.250 1.270
V
V
OUT
IN
OUT
J
10 ≤ 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 2.850 2.880
2.790 2.850 2.910
2.790 2.850 2.910
V
V
V
OUT
IN
J
0 ≤ I
0 ≤ I
≤ 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 3.300 3.333
3.235 3.300 3.365
V
V
OUT
IN
J
0 ≤ I
≤ 800mA, 4.75V ≤ V ≤ 10V
●
●
OUT
IN
I
= 10mA, V = 7V, T = 25°C
4.950 5.000 5.050
4.900 5.000 5.100
V
V
OUT
IN
J
0 ≤ I
≤ 800mA, 6.50V ≤ V ≤ 12V
OUT
IN
Line Regulation
Load Regulation
LT1117
I
I
I
I
= 10mA, 1.5V ≤ V – V ≤ 15V (Note 1)
OUT
●
●
●
●
0.035
0.2
6
6
%
mV
mV
mV
OUT
OUT
OUT
OUT
IN
LT1117-2.85
LT1117-3.3
LT1117-5
= 0mA, 4.25V ≤ V ≤ 10V (Note 1)
1
1
1
IN
= 0mA, 4.75V ≤ V ≤ 15V (Note 1)
IN
= 0mA, 6.5V ≤ V ≤ 15V (Note 1)
10
IN
LT1117
(V – V ) = 3V, 10mA ≤ I ≤ 800mA (Note 1)
OUT
●
●
●
●
0.1
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 1)
≤ 800mA (Note 1)
≤ 800mA (Note 1)
IN
IN
IN
OUT
OUT
= 6.5V, 0 ≤ I
1
OUT
Dropout Voltage
Current Limit
I
I
I
= 100mA (Note 2)
= 500mA (Note 2)
= 800mA (Note 2)
●
●
●
1.00
1.05
1.10
1.10
1.15
1.20
V
V
V
OUT
OUT
OUT
(V – V ) = 5V, T = 25°C,
800
950
1.7
1200
5
mA
mA
IN
OUT
J
Minimum Load Current LT1117
(V – V ) = 15V (Note 3)
●
IN
OUT
2
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
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
0.1
%/W
A
f
V
= 120Hz, (V – V ) = 3V,
IN OUT
RIPPLE
= 1Vp-p
●
●
●
60
75
55
dB
µA
RIPPLE
Adjust Pin Current
120
5
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise
10mA ≤ I
≤ 800mA, 1.4V ≤ (V – V ) ≤ 10V
0.2
0.5
0.3
0.003
15
µA
OUT
IN
OUT
%
T = 125°C, 1000Hrs
A
%
(% of V ), 10Hz ≤ f ≤ 10kHz
%
OUT
Thermal Resistance
(Junction-to-Case, at Tab)
°C/W
The
●
denotes specifications which apply over the full operating
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.
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 3: Minimum load current is defined as the minimum output current
required to maintain regulation.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Operating Current
(Adjustable Device)
Short-Circuit Current
Load Regulation
4
3
2
1
0
1.25
1.00
0.10
0.05
∆ I
= 800mA
LOAD
T = 125°C
J
T = 125°C
J
T = 25°C
J
0
0.75
0.50
0.25
0
T = 25°C
J
–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)
LT1117 • TPC02
LT1117 • TPC03
LT1117 • TPC04
3
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
LT1117 Ripple Rejection
LT1117 Ripple Rejection vs Current
Temperature Stability
2.0
1.0
100
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
V
≤
RIPPLE
P-P
V
≤ 3V
P-P
RIPPLE
0.5V
f
= 120Hz
RIPPLE
(V – V
≥ 3V
OUT)
IN
V
≤ 3V
P-P
RIPPLE
f
= 20kHz
P-P
0
RIPPLE
V
≤ 0.5V
(V – V
≥ V
DROPOUT
RIPPLE
IN
OUT)
30
20
10
0
–1.0
V
C
C
= 5V
= 25µF
= 25µF
C
C
I
= 200µF AT f < 60Hz
= 25µF AT f > 60Hz
= 0.5A
OUT
ADJ
OUT
ADJ
ADJ
OUT
10
0
–2.0
–50 –25
0
25 50 75 100 125 150
10
100
1k
FREQUENCY (Hz)
10k
100k
0
0.2
0.4
0.6
0.8
TEMPERATURE (°C)
OUTPUT CURRENT (A)
LT1117 • TPC07
LT1117 • TPC05
LT1117 • TPC06
LT1117-2.85
Load Transient Response
LT1117-5
Load Transient Response
Adjust Pin Current
100
90
80
70
60
50
0.3
0.2
0.3
0.2
0.1
0
0.1
0
C
C
V
= 10µF
C
C
V
= 10µF
IN
OUT
IN
IN
OUT
IN
–0.1
–0.2
0.5
–0.1
–0.2
0.5
= 10µF TANTALUM
= 10µF TANTALUM
40
30
20
10
0
= 4.25V
PRELOAD = 0.1A
= 6.5V
PRELOAD = 0.1A
0
0
–0.5
–0.5
–50 –25
0
25 50 75 100 125 150
0
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
TIME (µs)
TIME (µs)
LT1117 • TPC08
LT1117 • TPC09
LT1117 • TPC10
LT1117-2.8
Line Transient Response
LT1117-5
Line Transient Response
60
40
60
40
C
C
I
= 1µF
C
C
I
= 1µF
IN
OUT
IN
OUT
= 10µF TANTALUM
= 10µF TANTALUM
= 0.1A
= 0.1A
OUT
OUT
20
0
20
0
–20
–40
5.25
4.25
3.25
–20
–40
7.50
6.50
5.50
0
20 40 60 80 100 120 140 160 180 200
0
20 40 60 80 100 120 140 160 180 200
TIME (µs)
TIME (µs)
LT1117 • TPC11
LT1117 • TPC12
4
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
W
BLOCK DIAGRA
IN
+
–
THERMAL
LIMIT
ADJ
OUT
GND
FOR FIXED VOLTAGE DEVICE
LT1117 • BD01
U
O U
PPLICATI
A
HI TS
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.
TheLT1117familyofthree-terminalregulatorsareeasyto
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 toler-
ance. Reference stability over temperature is improved
over older types of regulators.
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. Out-
put capacitance can be increased without limit and larger
values of output capacitance further improve stability and
transient response.
Stability
The LT1117 family of regulators requires an output ca-
pacitor 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
shouldbelessthan0.5Ω. Surfacemounttantalumcapaci-
tors, which have very low ESR, are available from several
manufacturers.
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 stress-
ingthedie.TheinternalcurrentpathsontheLT1117adjust
pin are limited by internal resistors. Therefore, even with
capacitorsontheadjustpin, noprotectiondiodeisneeded
to ensure device safety under short circuit conditions. The
When using the LT1117 adjustable device the adjust
terminal can be bypassed to improve ripple rejection.
5
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
O U
PPLICATI
A
HI TS
adjust pin can be driven, on a transient basis, ±25V with
to set the overall output voltage. Normally this current is
chosentobethespecifiedminimumloadcurrentof10mA.
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.
respect to the output without any device degradation.
Diodes between input and output are not usually needed.
Theinternaldiodebetweentheoutputandinputpinsofthe
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
outputcapacitors,suchas1000µFandlarger,andwiththe
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.
Load Regulation
Because the LT1117 is a three-terminal device, it is not
possible to provide true remote load sensing. Load regu-
lation will be limited by the resistance of the wire connect-
ing 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 immedi-
ately 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:
D1
1N4002
(OPTIONAL)
LT1117
V
V
OUT
IN
OUT
IN
+
C
ADJ
OUT
150µF
R1
R2
+
C
ADJ
10µF
LT1117 • TA02
R2 +R1
R ×
,R = Parasitic Line Resistance
P
P
R1
Figure 1.
R
P
PARASITIC
LT1117
ADJ
Output Voltage
LINE RESISTANCE
V
IN
OUT
IN
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
currentiscausedtoflowthroughR1anddownthroughR2
R1
R
L
CONNECT
R1 TO CASE
R2
LT1117
V
V
OUT
IN
OUT
IN
CONNECT
ADJ
R2 TO LOAD
V
R1
R2
REF
LT1117 • TA04
I
ADJ
50µA
R2
V
= V
1 +
+ I
R2
ADJ
—
OUT
REF
(
)
R1
Figure 3. Connections for Best Load Regulation
LT1117 • TA03
For fixed voltage devices the top of R1 is internally Kelvin
connected, and the ground pin can be used for negative
side sensing.
Figure 2. Basic Adjustable Regulator
6
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
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PPLICATI
HI TS
A
Thethermalresistanceforeachapplicationwillbeaffected
by thermal interactions with other components on the
board. Some experimentation will be necessary to deter-
mine the actual value.
Thermal Considerations
LT1117 series regulators have internal thermal limiting
circuitry designed to protect the device during overload
conditions. For continuous normal load conditions how-
ever, the maximum junction temperature rating of 125°C
must not be exceeded.
The power dissipation of the LT1117 is equal to:
PD = ( VIN – VOUT )( IOUT
)
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 de-
vice must also be considered. Heat sinking is accom-
plishedusingtheheatspreadingcapabilityofthePCboard
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.
Maximum junction temperature will be equal to:
TJ = 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-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.
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
transmittingheatbetweenthepadarea, attachedtothetab
of the device, and a ground plane layer either inside or on
theoppositesideoftheboard. Althoughtheactualthermal
resistance of the PC material is high, the Length/Area ratio
of the thermal resistor between layers is small. The data in
Table1wastakenusing1/16" FR-4boardwith1oz.copper
foil. It can be used as a rough guideline in estimating
thermal resistance.
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).Forexample,withtheoutputvoltageequalto
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.
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
45°C/W
45°C/W
53°C/W
59°C/W
52°C/W
55°C/W
225 Sq. mm
100 Sq. mm
2500 Sq. mm 2500 Sq. mm
2500 Sq. mm 2500 Sq. mm
1000 Sq. mm 1000 Sq. mm 1000 Sq. mm
1000 Sq. mm 1000 Sq. mm
* Tab of device attached to topside copper
0
7
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
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TYPICAL APPLICATI S
1.2V to 10V Adjustable Regulator
5V Regulator with Shutdown
LT1117
LT1117
†
V
V
OUT
IN
OUT
V
5V
IN
OUT
IN
IN
R1
121Ω
121Ω
ADJ
ADJ
+
1%
10µF
+
+
C1*
10µF
C2
100µF
+
R2
1k
100µF
1k
2N3904
TTL
365Ω
1%
1k
* NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
LT1117 • TA06
R2
—
R1
†
V
= 1.25V 1 +
OUT
(
)
LT1117 • TA05
Remote Sensing
R
P
LT1117
(MAX. DROP 300mV)
OUTPUT
5V
V
IN
OUT
IN
ADJ
V
IN
+
100µF
25Ω
2
7
–
6
LM301A
+
R
1k
L
1
3
10µF
+
121Ω
8
4
5µF
365Ω
100pF
RETURN
25Ω
RETURN
LT1117 • TA07
Adjusting Output Voltage of Fixed Regulators
Regulator with Reference
LT1117-5
LT1117-5
V
> 12V
5V TO 10V
100µF
V
> 11.5V
10V
IN
OUT
IN
OUT
IN
IN
+
+
+
+
GND
GND
100µF
10µF
10µF
5V
OUT
+
10µF*
1k
LT1029
LT1117 • TA09
* OPTIONAL IMPROVES RIPPLE REJECTION
LT1117 • TA08
8
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
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TYPICAL APPLICATI S
Battery Charger
Battery Backed Up Regulated Supply
LT1117-5
OUT
LT1117
IF
OUT
5.2V LINE
V
V
OUT
IN
V
IN
IN
IN
IN
5.0V BATTERY
1.25V
ADJ
R
S
+
GND
10µF
R1
50Ω
R2
—
R1
V
– 1.25V 1 +
OUT
(
)
SELECT FOR
CHARGE RATE
IF =
R2
R1
LT1117-5
OUT
–R 1 +
S
—
(
)
+
+
1
IF
GND
=
6.5V
10µF
100µF
V
R2
OUT
–R 1 +
S
—
(
)
R1
LT1117 • TA13
LT1117 • TA10
Improving Ripple Rejection
Automatic Light Control
LT1117
LT1117
OUT
V
V
≥ 16.5V
IN
IN
OUT
R1
IN
IN
+
+
ADJ
ADJ
1.2k
121Ω
10µF
100µF
10µF
1%
150µF
R2
+
C1
10µF
365Ω
*C1 IMPROVES RIPPLE
1%
REJECTION. X SHOULD BE
C
≈ R1 AT RIPPLE FREQUENCY
LT1117 • TA14
LT1117 • TA16
High Efficiency Dual Supply
FEEDBACK PATH
MUR410
3.3V OUTPUT (TYPICAL)
470µF
+
LT1117-5
OUT
MUR410
+5V
IN
0.5A
GND
+
+
+
10µF
1N4002
470µF
+V
IN
LT1117-5
MUR410
IN
OUT
SWITCHING
REGULATOR
GND
+
10µF
1N4002
470µF
–5V
0.5A
LT1117 • TA12
9
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
O
TYPICAL APPLICATI S
High Efficiency Dual Linear Supply
L1
LT1117-5
OUT
285µH
+5V
0.5A
IN
+
MBR360
1k
GND
1000µF
(HEAT SINK)
2.4k
30k
Q1
2N6667
10k
510k
(DARLINGTON)
LT1004-2.5
+
+
D11
1N4002
100µF
20k*
30.1k*
+
MDA201
V
+
+
1/2
LT1018
4700µF
–
–
L1
LT1117-5
OUT
130VAC-
90VAC
STANCOR
P-8685
285µH
IN
+
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
= 1 % FILM RESISTORS
= MOTOROLA
= PULSE ENGINEERING, INC. #PE-92106
*
MDA
L1
–5V
0.5A
LT1117 • TA11
Low Dropout Negative Supply
LT1117-5
V
IN
OUT
IN
GND
+
+
10µF
100µF
V
= –5V
OUT
FLOATING INPUT
LT1117 • TA17
10
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
O
TYPICAL APPLICATI S
High Efficiency Regulator
LT1117
ADJ
1mH
OUTPUT
28V INPUT
IN
OUT
+
240Ω
MR1122 10,000µF
10k
+
470Ω
100µF
2k
OUTPUT
ADJUST
28V
1N914
1k
1M
4N28
10k
+
–
LT1011
10k
28V
1N914
LT1117 • TA15
U W
ETHODS
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.
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 recom-
mended since these methods can easily damage the
part with excessive thermal gradients across the pack-
age.
LT1117 • TA18
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
M Package
3-Lead Plastic DD
0.401 ± 0.015
0.060
(10.185 ± 0.381)
(1.524)
0.175 ± 0.008
0.050 ± 0.008
(4.445 ± 0.203)
(1.270 ± 0.203)
15° TYP
+0.008
0.004
+0.012
–0.020
+0.305
–0.508
–0.004
0.331
0.059
(1.499)
TYP
+0.203
–0.102
0.102
(
)
8.407
(
)
0.105 ± 0.008
(2.667 ± 0.203)
0.100 ± 0.010
(2.5402 ± 0.254)
0.050 ± 0.008
(1.270 ± 0.203)
0.050 ± 0.012
(1.270 ± 0.305)
+0.012
–0.020
+0.305
–0.508
0.022 ± 0.005
(0.559 ± 0.127)
0.143
DD3 0693
3.632
(
)
ST Package
3-Lead Plastic SOT-223
0.248 – 0.264
(6.30 – 6.71)
0.116 – 0.124
(2.95 – 3.15)
10° – 16°
0.010 – 0.014
(0.25 – 0.36)
0.264 – 0.287
(6.71 – 7.29)
10°
MAX
0.130 – 0.146
(3.30 – 3.71)
0.071
(1.80)
MAX
0.025 – 0.033
(0.64 – 0.84)
0.181
0.012
(0.31)
MIN
10° – 16°
0.0008 – 0.0040
(0.0203 – 0.1016)
(4.60)
NOM
SOT233 0793
0.033 – 0.041
(0.84 – 1.04)
0.090
(2.29)
NOM
LT/GP 0993 5K REV B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
12
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1993
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