LT1118-5 [Linear]
Low IQ, Low Dropout, 800mA, Source and Sink Regulators Adjustable and Fixed 2.5V, 2.85V, 5V Output; 低IQ ，低压降， 800毫安，源库调节可调和固定2.5V ， 2.85V ， 5V输出
| 型号： | LT1118-5 |
| 厂家： | 
Linear |
| 描述： | Low IQ, Low Dropout, 800mA, Source and Sink Regulators Adjustable and Fixed 2.5V, 2.85V, 5V Output |
| 文件： | 总8页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
Lo w I , Lo w Dro p o ut,
Q
800m A, So urc e a nd Sink
Re g ula to rs Ad justa b le a nd
Fixe d 2.5V, 2.85V, 5V Outp ut
U
FEATURES
DESCRIPTION
The LT®1118 family of low dropout regulators has the
unique capability of maintaining output regulation while
sourcingorsinkingloadcurrent. The2.85Voutputvoltage
regulator is ideal for use as a Boulay termination of up to
27 SCSI data lines. The regulator maintains regulation
while both sourcing and sinking current, enabling the use
of active negation drivers for improved noise immunity on
the data lines. Regulation of output voltage is maintained
for TERMPWR voltages as low as 4.0V. When unloaded,
quiescentsupplycurrentis alow600µA,allowingcontinu-
ous connection to the TERMPWR lines. An ultralowpower
shutdown mode is also available on the SO-8 version. In
Shutdown the output is high impedance and supply cur-
rent drops to less than 10µA.
■
Regulates While Sourcing or Sinking Current
Provides Termination for up to 27 SCSI Lines
600µA Quiescent Current
Ultra-Low Power Shutdown Mode
Current Limit and Thermal Shutdown Protection
Stable for Any CLOAD ≥ 0.22µF
Fast Settling Time
1V Dropout Voltage
■
■
■
■
■
■
■
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APPLICATIONS
■
Active Negation SCSI Terminations
Computers
Disk Drives
CD-ROM
■
■
■
Current limits in both sourcing and sinking modes, plus
on-chip thermal shutdown make the circuit tolerant of
output fault conditions.
■
Supply Splitter
The LT1118 is available in 3-lead SOT-223 and 8-lead SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Load Transient Response
0.2V
0V
LT1118-2.85 OUT
GND
∆VOUT
IN
–0.2V
1µF
CERAMIC
800mA
5V
2.2µF
I
LOAD
ILOAD
1118 TA01
0mA
–400mA
1118 TA02.tif
1
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
W W
U W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (V ) ............................................... 15V
Input Voltage (Enable) ................................–0.2V to 7V
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
CC
Output Voltage................................ –0.2V to V + 0.5V
CC
Short-Circuit Duration ..................................... Indefinite
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W U
PACKAGE/ORDER INFORMATION
FRONT VIEW
TOP VIEW
TOP VIEW
3
2
1
IN
GND
NC
EN
1
2
3
4
8
7
6
5
GND
IN
IN
OUT
GND
IN
1
2
3
4
8
7
6
5
EN
TAB IS
GND
GND
GND
NC
GND
OUT
OUT
IN
FB
ST PACKAGE
3-LEAD PLASTIC SOT-223
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PACKAGE
8-LEAD PLASTIC SO
JMAX = 125°C, θJC = 15°C/W
T
JMAX = 125°C, θJC = 15°C/W
T
T
JMAX = 125°C, θJC = 15°C/W
ORDER PART NUMBER
LT1118CS8
ORDER PART NUMBER
ORDER PART NUMBER
LT1118CS8-2.5
LT1118CS8-2.85
LT1118CS8-5
LT1118CST-2.5
LT1118CST-2.85
LT1118CST-5
S8 PART MARKING
1118
S8 PART MARKING
111825
111828
11185
Consult factory for Industrial and Military grade parts.
(Note 2)
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
0.6
1
MAX
1
UNITS
mA
Quiescent Current (V )
V
= 5V
= 0V
●
●
IN
EN
Quiescent Current in Shutdown (V )
V
10
µA
IN
EN
Enable Input Thresholds
Input Low Level
Input High Level
●
●
0.4
–1
1.4
1.4
V
V
2
Enable Input Current
0V ≤ V ≤ 5V
●
●
●
●
25
µA
EN
Output Voltage
LT1118-2.5
No Load (25°C)
All Operating Conditions (Note 3)
2.47
2.45
2.5
2.5
2.53
2.55
V
V
LT1118-2.85
LT1118-5
No Load (25°C)
All Operating Conditions (Note 3)
2.82
2.79
2.85
2.85
2.88
2.91
V
V
No Load (25°C)
All Operating Conditions (Note 3)
4.95
4.90
5
5
5.05
5.1
V
V
Line Regulation (Note 4)
LT1118-2.5
LT1118-2.85
LT1118-5
I = 0mA, 4.2V ≤ V ≤ 15V
●
●
●
6
6
10
mV
mV
mV
L
IN
I = 0mA, 4.75V ≤ V ≤ 15V
L
IN
I = 0mA, 6.5V ≤ V ≤ 15V
L
IN
2
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
(Note 2)
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Load Regulation (Note 4)
LT1118-2.5
LT1118-2.85
LT1118-5
0mA ≤ I ≤ 800mA
●
●
10
10
mV
mV
L
–400mA ≤ I ≤ 0mA
L
0mA ≤ I ≤ 800mA
●
●
10
10
mV
mV
L
–400mA ≤ I ≤ 0mA
L
0mA ≤ I ≤ 800mA
●
●
20
20
mV
mV
L
–400mA ≤ I ≤ 0mA
L
Dropout Voltage (Note 5)
I = 100mA
I = 800mA
L
0.85
1
1.1
1.3
V
V
L
Minimum Output Voltage
Ripple Rejection
LT1118
●
2
V
f
= 120Hz, V – V = 2V
60
80
dB
RIPPLE
IN
OUT
V
RIPPLE
= 0.5V
P-P
Load Transient Settling Time,
∆V = 1%
0mA ≤ I ≤ 800mA, C
= 1µF
5
5
µs
µs
L
LOAD
–400mA ≤ I ≤ 0mA, C
= 1µF
L
LOAD
+
Output Short-Circuit Current
I
I
V
V
OUT
= 0V
= V
IN
800
1200
–700
mA
mA
SC
OUT
–
–400
SC
Thermal Shutdown Junction Temperature
Enable Turn-On Delay
No Load
No Load
170
50
°C
µs
The
●
denotes specifications which apply over the operating temperature
Note 3: All operating conditions include the combined effects of load
range.
current, input voltage and temperature over each parameter’s full range.
Note 1: Absolute maximum ratings are those values beyond which the life
Note 4: Load and line regulation are tested at a constant junction
of the device may be impaired.
temperature by low duty cycle pulse testing.
Note 2: Unless otherwide specified, testing done at V = 5V
Note 5: Dropout voltage is defined as the minimum input to output voltage
CC
(LT1118-2.5, LT1118-2.85) or V = 7V (LT1118-5). V = V . Output
measured while sourcing the specified current.
CC
EN
CC
C
LOAD
= 1µF, I
= 0.
LOAD
3
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
W
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TYPICAL PERFORMANCE CHARACTERISTICS
Ripple Rejection vs Frequency
Ripple Rejection vs Frequency
Dropout Voltage vs Output Current
80
60
40
20
0
80
60
40
20
0
1.4
1.2
1
800mA
400mA
T = 75°C
J
T = 25°C
J
10mA
10mA
0.8
0.6
0.4
0.2
0
T = 125°C
J
NO LOAD
NO LOAD
SOURCING CURRENT
SINKING CURRENT
100
10
100
1k
10k
100k
10
1k
10k
100k
0
200
400
600
800
FREQUENCY (Hz)
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
1118 G02
1118 G03
1118 G01
Output Impedance vs Frequency
Feedback Current vs Temperature
Ripple Rejection vs Load Current
10
1
450
400
350
300
250
200
150
100
50
80
60
40
20
0
C
= C
= 1µF
IN
LOAD
NO CURRENT
100mA SOURCE
10mA SOURCE
0.1
0.01
0.001
100mA SINK
10mA SINK
0
2
3
4
5
6
–400 –200
0
200
400
600
800
–55 –35 –15
5
25 45 65 85 105 125
TEMP
10
10
10
FREQUENCY (Hz)
10
10
LOAD CURRENT (mA)
1118 G04
1118 G06
1118 G05
Input Current vs
Output Sink Current
Ground Pin Current vs
Output Source Current
800
700
600
500
400
300
200
100
0
2000
1750
1500
1250
1000
750
500
250
0
400
OUTPUT SOURCING CURRENT (mA)
0
200
600
800
200 250
300 350 400
0
50 100 150
OUTPUT SINK CURRENT (mA)
1118 G08
1118 G07
4
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
U
U
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PIN FUNCTIONS
OUT:RegulatedOutputVoltage. Outputcansourceorsink
current. Current limit for sourcing and sinking current is
provided to protect the device from fault conditons. The
output must have a low ESR output filter capacitor. COUT
≥ 0.22µF to guarantee stability. A 0.1µF ceramic capacitor
may be needed in parallel with COUT if the ESR of the main
COUT is too high.
IN: Input Supply Pin. This pin should be decoupled with a
1µF or larger low ESR capacitor. The two IN pins on the
SO-8 package must be directly connected on the printed
circuit board to prevent voltage drops between the two
inputs. When used as a SCSI active termination, IN con-
nects to term power. When used as a supply splitter, IN is
also the positive supply output.
FB: FeedbackPin. Thefeedbackpinis usedtoprogramthe
output voltage of the adjustable S8 part. The output
voltage is determined by the selection of feedback resis-
tors defined by the following formula:
GND: Ground Pin. The multiple GND pins on the SO-8
package are internally connected, but lowest load regula-
tion errors will result if these pins are tightly connected on
the printed circuit board. This will also aid heat dissipation
at high power levels.
VOUT = V (1 + R1/R2) + IFBR1
FB
EN: TTL/CMOS Logic Input. A high level allows normal
operation. A low level reduces supply current to zero. This
LT1118 Adjustable
pin is internally connected to V on 3-lead ST packaged
devices.
IN
R
1
V
IN
OUT
FB
V
OUT
= V 1 +
+ I
R
IN
FB
FB 1
(
)
R
2
1µF
1µF
LT1118
GND
R
1
EN
R
2
1118 TA06
U
OPERATIO
Output Capacitor
Worst case transient response of the LT1118 regulators
occurs atzerooutputcurrent. Inordertoobtainthefastest
transient settling performance, the regulator output may
be preloaded with a small current. The preload current
reduces the regulator output impedance, reducing output
voltage settling time.
The LT1118 family of voltage regulators require an output
capacitor for stability. The regulators are stable with
output capacitors larger than 0.2µF. Load transient re-
sponse is very sensitive to output capacitor value and
dielectricchoice. LowESRceramiccapacitors arethebest
choice for fast settling to load transients. Output capaci-
tors between 0.2µF and 1µF give good performance in
mostapplications. Largertantalumoutputcapacitors may
be used to reduce load transient amplitudes. Larger ca-
pacitors should be paralleled with a 0.1µF ceramic capaci-
tor to maintain quick settling time performance and to
insure stability of the regulator control loop. Capacitors
larger than 10µF may be safely used with the regulators,
but little transient settling performance improvement re-
sults from their use.
Thermal Considerations
The LT1118 regulators are packaged in plastic SOT-223
and fused lead S8 packages. These small footprint pack-
ages are unable to convectively dissipate the heat gener-
ated when the regulator is operating at high current levels.
In order to control die operating temperatures, the PC
board layout should allow for maximum possible copper
area at the ground pins of the LT1118. The ground pins
and the tab on the SOT-223 package are electrically and
5
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
U
OPERATIO
thermally connected to the die substrate. Table 1 shows
measured thermal resistance from junction to ambient for
the LT1118 connected to various sized PC board ground
planes. The power dissipated in the LT1118 varies with
input voltage and loading. When the regulator is sourcing
current the power which must be dissipated by the pack-
age is:
When the regulator is sinking load current, power dissipa-
tion is nearly independent of V and can be calculated as:
IN
PD = VOUT • ILOAD
.
Heat sinking to the IC package must consider the worst
case power dissipation which may occur.
Table 1. Measured Thermal Resistance from Junction to
Ambient for the LT1118
PD = (V – VOUT) • ILOAD
.
IN
S8 Package
SOT-223
Free Air
1 Sq Inch Copper
120°C/W
55°C/W
95°C/W
53°C/W
4 Sq Inch Copper
35°C/W
38°C/W
U
TYPICAL APPLICATIONS
SCSI Active Terminator
110Ω
•
•
•
•
TERMPWR
110Ω
110Ω
110Ω
27 LINES
LT1118-2.85 OUT
GND
IN
•
•
•
•
110Ω
+
5V
2.2µF
1µF
1118 TA03
Power Supply Splitter
V
5V
IN
5V
ANALOG
COMMON
2.5V
LT1118-2.5 OUT
IN
1µF
GND
1µF
1118 TA04
6
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
ST Package
3-Lead Plastic SOT-223
(LTC DWG # 05-08-1630)
0.248 – 0.264
(6.30 – 6.71)
0.116 – 0.124
(2.95 – 3.15)
0.264 – 0.287
(6.71 – 7.29)
0.130 – 0.146
(3.30 – 3.71)
0.033 – 0.041
(0.84 – 1.04)
0.090
(2.29)
NOM
10° – 16°
0.010 – 0.014
(0.25 – 0.36)
10°
0.071
(1.80)
MAX
MAX
10° – 16°
0.0008 – 0.0040
(0.0203 – 0.1016)
0.025 – 0.033
(0.64 – 0.84)
0.012
(0.31)
MIN
0.181
(4.60)
NOM
ST3 (SOT-233) 0792
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0996
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
3
4
2
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-
tationthattheinterconnectionofits circuits as describedhereinwillnotinfringeonexistingpatentrights.
7
LT1118/ LT1118-2.5
LT1118-2.85/ LT1118-5
U
TYPICAL APPLICATION
Variable 2V to 10V Regulator with Digital Control
12V
0.1µF
IN
OUT
FB
V
OUT
1µF
0.22µF
R
22k
LT1118
GND
1
V
CC
D
IN
R
5.1k
2
V
DAC
µP
V
OUT
LTC1257
CLK
EN
R
6.2k
3
GND
V
REF
LOAD
1118 TA05
R
1
R
1
V
OUT
= 1.225 1 +
– V
DAC
R
|| R
R
2
2
3
)
(
RELATED PARTS
PART NUMBER
DESCRIPTION
Logic Controlled Regulator
800mA Low Dropout Regulator
COMMENTS
LT1005
5V, 1A Main Output Plus 35mA Auxilliary Output
Fixed 2.85V, 3.3V, 5V or Adjustable Outputs
20µA Supply Current, 2.5V Reference Output
Reverse Voltage and Reverse Current Protection
LT1117
LT1120A
LT1121
Micropower Regulator with Comparator and Shutdown
Micropower Low Dropout Regulator with Shutdown
1118fa LT/TP 0598 2K REV A • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1995
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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