LT1118/-2.5/-2.85/-5 Datasheet by Analog Devices Inc.

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‘ LT1118/LT1118—2.5 LT1118—2.85 LT1118-5 TECHNOLOGY L7 LJUW
LT1118/LT1118-2.5
LT1118-2.85/LT1118-5
1
1118fd
TYPICAL APPLICATION
DESCRIPTION
Low IQ, Low Dropout,
800mA, Source and Sink
Regulators Adjustable and
Fixed 2.5V, 2.85V, 5V Output
The LT
®
1118 family of low dropout regulators has the
unique capability of maintaining output regulation while
sourcing or sinking load current. The 2.85V output voltage
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,
quiescent supply current is a low 600μA, allowing continu-
ous connection to the TERMPWR lines. An ultralow power
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.
Current limits in both sourcing and sinking modes, plus
on-chip thermal shutdown make the circuit tolerant of
output fault conditions.
The LT1118 is available in 3-lead SOT-223 and 8-lead SO
packages.
Load Transient Response
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
n Regulates While Sourcing or Sinking Current
n Provides Termination for up to 27 SCSI Lines
n 600μA Quiescent Current
n Ultralow Power Shutdown Mode
n Current Limit and Thermal Shutdown Protection
n Stable for Any CLOAD ≥ 0.22μF
n Fast Settling Time
n 1V Dropout Voltage
n Active Negation SCSI Terminations
n Computers
n Disk Drives
n CD-ROM
n Supply Splitter
LT1118-2.85
GND
1118 TA01
IN
2.2μF
5V F
CERAMIC ILOAD
OUT
0.2V
0V
–0.2V
800mA
0mA
–400mA
1118 TA02
$VOUT
ILOAD
LT1118—2.85/LT1118—5 K j K j j K j K j j K j K j K j K j j L7LJCUEN2
LT1118/LT1118-2.5/
LT1118-2.85/LT1118-5
2
1118fd
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ................................................15V
Input Voltage (Enable).................................0.2V to 7V
Output Voltage ............................... 0.2V to VCC + 0.5V
Short-Circuit Duration ..................................... Indefi nite
(Note 1)
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
GND
IN
OUT
IN
GND
NC
EN
FB
TJMAX = 125°C, θJA = 15°C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
EN
GND
GND
NC
IN
OUT
GND
IN
TJMAX = 125°C, θJA = 15°C/W
3
2
1
FRONT VIEW
TAB IS
GND
IN
GND
OUT
ST PACKAGE
3-LEAD PLASTIC SOT-223
TJMAX = 125°C, θJC = 15°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1118CS8#PBF LT1118CS8#TRPBF 1118 8-Lead Plastic SO 0°C to 70°C
LT1118CS8-2.5#PBF LT1118CS8-2.5#TRPBF 111825 8-Lead Plastic SO 0°C to 70°C
LT1118CS8-2.85#PBF LT1118CS8-2.85#TRPBF 111828 8-Lead Plastic SO 0°C to 70°C
LT1118CS8-5#PBF LT1118CS8-5#TRPBF 11185 8-Lead Plastic SO 0°C to 70°C
LT1118CST-2.5#PBF LT1118CST-2.5#TRPBF 111825 3-Lead Plastic SOT-223 0°C to 70°C
LT1118CST-2.85#PBF LT1118CST-2.85#TRPBF 111828 3-Lead Plastic SOT-223 0°C to 70°C
LT1118CST-5#PBF LT1118CST-5#TRPBF 11185 3-Lead Plastic SOT-223 0°C to 70°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1118CS8 LT1118CS8#TR 1118 8-Lead Plastic SO 0°C to 70°C
LT1118CS8-2.5 LT1118CS8-2.5#TR 111825 8-Lead Plastic SO 0°C to 70°C
LT1118CS8-2.85 LT1118CS8-2.85#TR 111828 8-Lead Plastic SO 0°C to 70°C
LT1118CS8-5 LT1118CS8-5#TR 11185 8-Lead Plastic SO 0°C to 70°C
LT1118CST-2.5 LT1118CST-2.5#TR 111825 3-Lead Plastic SOT-223 0°C to 70°C
LT1118CST-2.85 LT1118CST-2.85#TR 111828 3-Lead Plastic SOT-223 0°C to 70°C
LT1118CST-5 LT1118CST-5#TR 11185 3-Lead Plastic SOT-223 0°C to 70°C
Consult LTC Marketing for parts specifi ed 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 specifi cations, go to: http://www.linear.com/tapeandreel/
Operating Temperature Range...................... 0°C to 70°C
Storage Temperature Range ...................65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LT1118—2.85[LT1118—5 L7 LJUW
LT1118/LT1118-2.5
LT1118-2.85/LT1118-5
3
1118fd
ELECTRICAL CHARACTERISTICS
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: Unless otherwide specifi ed, testing done at VCC = 5V
(LT1118-2.5, LT1118-2.85) or VCC = 7V (LT1118-5). VEN = VCC.
Output CLOAD = 1μF, ILOAD = 0.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current (VIN)V
EN = 5V l0.6 1 mA
Quiescent Current in Shutdown (VIN)V
EN = 0V l110 μA
Enable Input Thresholds Input Low Level
Input High Level
l
l
0.4 1.4
1.4 2
V
V
Enable Input Current 0V ≤ VEN ≤ 5V l–1 25 μA
Feedback Voltage No Load (25°C) (LT1118)
All Operating Conditions (Note 3) l
1.213
1.200
1.225
1.225
1.237
1.250
V
V
Output Voltage No Load (25°C) (LT1118-2.5)
All Operating Conditions (Note 3) l
2.47
2.45
2.5
2.5
2.53
2.55
V
V
No Load (25°C) (LT1118-2.85)
All Operating Conditions (Note 3) l
2.82
2.79
2.85
2.85
2.88
2.91
V
V
No Load (25°C) (LT1118-5)
All Operating Conditions (Note 3) l
4.95
4.90
5
5
5.05
5.10
V
V
Line Regulation (Note 4) IL = 0mA, 4.2V ≤ VIN ≤ 15V (LT1118)
IL = 0mA, 4.2V ≤ VIN ≤ 15V (LT1118-2.5)
IL = 0mA, 4.75V ≤ VIN ≤ 15V (LT1118-2.85)
IL = 0mA, 6.5V ≤ VIN ≤ 15V (LT1118-5)
l
l
l
l
6
6
6
10
mV
mV
mV
mV
Load Regulation (Note 4) 0mA ≤ IL ≤ 800mA (LT1118)
400mA ≤ IL ≤ 0mA
l
l
6
6
mV
mV
0mA ≤ IL ≤ 800mA (LT1118-2.5)
400mA ≤ IL ≤ 0mA
l
l
12
12
mV
mV
0mA ≤ IL ≤ 800mA (LT1118-2.85)
400mA ≤ IL ≤ 0mA
l
l
12
12
mV
mV
0mA ≤ IL ≤ 800mA (LT1118-5)
400mA ≤ IL ≤ 0mA
l
l
25
25
mV
mV
Dropout Voltage (Note 5) IL = 100mA
IL = 800mA
0.85
1
1.1
1.3
V
V
FB Pin Bias Current LT1118 0.35 1 μA
Minimum Output Voltage LT1118 l2.1 V
Ripple Rejection fRIPPLE = 120Hz, VIN – VOUT = 2V
VRIPPLE = 0.5VP-P
60 80 dB
Load Transient Settling Time,
ΔV = 1%
0mA ≤ IL ≤ 800mA, CLOAD = 1μF
–400mA ≤ IL ≤ 0mA, CLOAD = 1μF
5
5
μs
μs
Output Short-Circuit Current VOUT = 0V, Sourcing
VOUT = VIN, Sinking
800 1200
–700 –400
mA
mA
Thermal Shutdown Junction Temperature No Load 170 °C
Enable Turn-On Delay No Load 50 μs
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. (Note 2)
Note 3: All operating conditions include the combined effects of load
current, input voltage and temperature over each parameters full range.
Note 4: Load and line regulation are tested at a constant junction
temperature by low duty cycle pulse testing.
Note 5: Dropout voltage is defi ned as the minimum input to output voltage
measured while sourcing the specifi ed current.
LT1118—2.85/LT1118—5 HHH WM y 2? LUAD Il L7LJCUEN2
LT1118/LT1118-2.5/
LT1118-2.85/LT1118-5
4
1118fd
TYPICAL PERFORMANCE CHARACTERISTICS
Output Impedance vs Frequency Feedback Current vs Temperature Ripple Rejection vs Load Current
Input Current
vs Output Sink Current
Ground Pin Current
vs Output Source Current
Dropout Voltage vs Output Current Ripple Rejection vs Frequency Ripple Rejection vs Frequency
OUTPUT CURRENT (mA)
0 200 400 600 800
DROPOUT VOLTAGE (V)
1118 G01
1.4
1.2
1
0.8
0.6
0.4
0.2
0
TJ = 75°C
TJ = 25°C
TJ = 125°C
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
80
60
40
20
010 1k 10k 100k
1118 G02
100
SOURCING CURRENT
NO LOAD
800mA
10mA
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
80
60
40
20
010 1k 10k 100k
1118 G03
100
SINKING CURRENT
NO LOAD
400mA
10mA
FREQUENCY (Hz)
102
0.001
ZOUT (Ω)
0.1
10
104105
103106
1118 G04
0.01
1
NO CURRENT
10mA SOURCE
100mA SOURCE
10mA SINK
100mA SINK
TEMPERATURE (°C)
–55 –35 –15 5 25 45 65 85 105 125
CURRENT (nA)
450
400
350
300
250
200
150
100
50
0
1118 G05
LOAD CURRENT (mA)
–400
RIPPLE REJECTION (dB)
80
60
40
20
0–200 0 200 400
1118 G06
600 800
CIN = CLOAD = 1μF
OUTPUT SINK CURRENT (mA)
0
INPUT CURRENT (μA)
1000
1250
1500
400
1118 G07
750
500
0100 200 300
250
2000
1750
50 150 250 350
OUTPUT SOURCING CURRENT (mA)
0
GROUND PIN CURRENT (μA)
400
500
600
800
1118 G08
300
200
0200 400 600
100
800
700
LT1118—2.85[LT1118—5 "H |_. l_. L7 LJUW
LT1118/LT1118-2.5
LT1118-2.85/LT1118-5
5
1118fd
PIN FUNCTIONS
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.
GND: Ground Pin. The multiple GND pins on the SO-8
package are internally connected, but lowest load regulation
errors will result if these pins are tightly connected on the
printed circuit board. This will also aid heat dissipation at
high power levels.
EN: TTL/CMOS Logic Input. A high level allows normal
operation. A low level reduces supply current to zero. This
pin is internally connected to VIN on 3-lead ST packaged
devices.
OUT: Regulated Output Voltage. Output can source or sink
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 fi lter 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.
FB: Feedback Pin. The feedback pin is used to program
the output voltage of the adjustable S8 part. The output
voltage range that can be achieved is 2.1V to 6.5V. The
output voltage is determined by the selection of feedback
resistors defi ned by the following formula:
V
OUT = VFB (1 + R1/R2) + IFBR1
OPERATION
GND
IN OUT
EN FB
R1
R2
F
VIN
1118 TA06
LT1118
F
R1
R2
1 +VOUT = VFB + IFB R1
()
LT1118 Adjustable
Output Capacitor
The LT1118 family of voltage regulators require an output
capacitor for stability. The regulators are stable with out-
put capacitors larger than 0.2μF. Load transient response
is very sensitive to output capacitor value and dielectric
choice. Low ESR ceramic capacitors are the best choice
for fast settling to load transients. Output capacitors
between 0.2μF and 1μF give good performance in most
applications. Larger tantalum output capacitors may be
used to reduce load transient amplitudes. Larger capaci-
tors should be paralleled with a 0.1μF ceramic capacitor
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 results
from their use.
Worst case transient response of the LT1118 regulators
occurs at zero output current. In order to obtain the fastest
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.
Thermal Considerations
The LT1118 regulators are packaged in plastic SOT-223 and
fused lead S8 packages. These small footprint packages
are unable to convectively dissipate the heat generated
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 thermally
LT1118—2.85/LT1118—5 fl L7LJCUEN2
LT1118/LT1118-2.5/
LT1118-2.85/LT1118-5
6
1118fd
OPERATION
SCSI Active Terminator
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 package is:
P
D = (VIN – VOUT) • ILOAD
When the regulator is sinking load current, power dissipa-
tion is nearly independent of VIN and can be calculated
as:
P
D = 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
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
TYPICAL APPLICATIONS
Power Supply Splitter
LT1118-2.85
GND
IN
27 LINES
2.2μF
5V F
110Ω
110Ω
1118 TA03
110Ω
110Ω
110Ω
TERMPWR
OUT
+
LT1118-2.5
GND
IN
F
1118 TA04
5V
ANALOG
COMMON
2.5V
VIN
5V
OUT
F
LT1118—2.85 LT1118—5 L7 LJUW
LT1118/LT1118-2.5
LT1118-2.85/LT1118-5
7
1118fd
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.
PACKAGE DESCRIPTION
ST Package
3-Lead Plastic SOT-223
(Reference LTC DWG # 05-08-1630)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(Reference LTC DWG # 05-08-1610)
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0°– 8° TYP
.008 – .010
(0.203 0.254)
SO8 0303
.053 – .069
(1.346 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.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
LT1118—2.85/LT1118—5 L7LJCUEN2
LT1118/LT1118-2.5/
LT1118-2.85/LT1118-5
8
1118fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1995
LT 0209 REV D • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
Variable 2.1V to 6.5V Regulator with DIgital Control
GND
IN OUT
EN FB
R1
13.3k R2
6.19k
R3
6.19k
0.22μF
VOUT
VOUT
GND VREF
VCC DIN
1118 TA05
CLKLTC1257
VDAC
0.1μF
12V
LT1118
μP
LOAD
F
R1
R2 || R3
R1
R2
()
1 +VOUT = 1.225 – VDAC
PART NUMBER DESCRIPTION COMMENTS
LT1129 700mA, Micropower, LDO VIN: 4.2V to 30V, VOUT(MIN) = 3.8V, VDO = 0.40V, IQ = 50μA, ISD = 16μA;
DD, SOT-223, S8, TO220-5 and TSSOP20 Packages
LT1206 250mA/60MHz Current Feedback Amplifi er High Output Current Drive Capability, Can Sink/Source
LT1210 1.1A, 35MHz Current Feedback Amplifer High Output Current Drive Capability, Can Sink/Source
LT1763 500mA, Low Noise Micropower, LDO VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 30μA, ISD = < 1μA,
Low Noise < 20μVRMS, S8 Package
LT1764/
LT1764A
3A, Low Noise, Fast Transient Response,
LDO
VIN: 2.7V to 20V, VOUT(MIN) = 1.21V, VDO = 0.34V, IQ = 1mA, ISD = < 1μA, Low Noise
< 40μVRMS, “A” Version Stable with Ceramic Capacitors, DD and TO220-5 Packages
LTC1844 150mA, Very Low Drop-Out LDO VIN: 1.6V to 6.5V, VOUT(MIN) = 1.25V, VDO = 0.08V, IQ = 35μA, ISD = < 1μA,
Low Noise < 60μVRMS, ThinSOT™ Package
LT1962 300mA, Low Noise Micropower, LDO VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.27V, IQ = 30μA, ISD = < 1μA,
Low Noise < 20μVRMS, MS8 Package
LT1963/
LT1963A
1.5A, Low Noise, Fast Transient Response,
LDO
VIN: 2.1V to 20V, VOUT(MIN) = 1.21V, VDO = 0.34V, IQ = 1mA, ISD = < 1μA,
Low Noise < 40μVRMS, “A” Version Stable with Ceramic Capacitors;
DD, TO220-5, SOT-223 and S8 Packages
LT3021 500mA, Low Voltage VDO, VIN(MIN) = 0.9V,
LDO
VIN: 0.9V to 10V, VOUT(MIN) = 0.20V, VDO = 0.16V, IQ = 120μA, ISD = 3μA, DFN and
S8 Packages
LT3024 Dual, 100mA/500mA, Low Noise
Micropower, LDO
VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 60μA, ISD = < 1μA, DFN and
TSSOP Packages
LT3028 Dual, 100mA/500mA, Low Noise
Micropower, LDO with Independent Inputs
VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 30μA, ISD = < 1μA,
Low Noise < 20μVRMS, DFN and TSSOP 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, MSOP and 3mm × 3mm DFN
Packages; LT3080-1 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 Reference, MSOP-8 and 2mm × 3mm DFN-6 Packages
ThinSOT is a trademark of Linear Technology Corporation

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