LT1010
Fast ±150mA Power Buffer
FTEATURES
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DESCRIPTION
The LT
®
1010 is a fast, unity-gain buffer that can increase
the output capability of existing IC op amps by more than
an order of magnitude. This easy-to-use part makes fast
amplifiers less sensitive to capacitive loading and reduces
thermal feedback in precision DC amplifiers.
Designed to be incorporated within the feedback loop, the
buffer can isolate almost any reactive load. Speed can be
improved with a single external resistor. Internal operating
currents are essentially unaffected by the supply voltage
range. Single supply operation is also practical.
This monolithic IC is supplied in 8-pin miniDIP plastic
,
TO-220 and 8-pin DFN packages. The low thermal re-
sistance power package is an aid in reducing operating
junction temperatures.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
20MHz Bandwidth
75V/µs Slew Rate
Drives ±10V Into 75Ω
5mA Quiescent Current
Drives Capacitive Loads > 1µF
Current and Thermal Limit
Operates from Single Supply ≥ 4.5V
Very Low Distortion Operation
Available in 8-Pin miniDIP Plastic TO-220
,
and Tiny 3mm
×
3mm
×
0.75mm 8-Pin DFN Packages
APPLICATIONS
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Boost Op Amp Output
Isolate Capacitive Loads
Drive Long Cables
Audio Amplifiers
Video Amplifiers
Power Small Motors
Operational Power Supply
FET Driver
TYPICAL APPLICATION
Very Low Distortion Buffered Preamplifier
V
+
18V
0.4
R7
50
R6
100
V
+
IN
LT1010CT
BOOST
OUT
HARMONIC DISTORTION (%)
0.3
R8
100
C2
22pF
V
OUT
= 10V
P-P
R
L
= 400
R1
1k
C1
22pF
3
R2
1M
+
–
7
6
R4
10k
2
R3
1k
LT1056CN8
4
OUTPUT
V
–
V
+
0.2
0.1
NOTE 1: ALL RESISTORS 1% METAL FILM
NOTE 2: SUPPLIES WELL BYPASSED AND LOW Z
O
V
+
LM334
I
SET
= 2mA V
–
R
SET
33.2
1%
1010 TA01
0
10
100
–18V
1k
10k
FREQUENCY (Hz)
100k
1010 TA02
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LT1010
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PRECONDITIONING
100% Thermal Limit Burn In–LT1010CT
Total Supply Voltage .............................................±22V
Continuous Output Current (Note 2) ................. ±150mA
Input Current (Note 3)......................................... ±40mA
Junction Temperature Range
LT1010C................................................ 0°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
V
+
1
BIAS 2
OUT 3
NC 4
9
TOP VIEW
8
7
6
5
INPUT
NC
V
–
NC
V
+
1
BIAS 2
OUT 3
NC 4
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W,
θ
JC
= 7.5°C/W
EXPOSED PAD (PIN 9) V
–
CAN BE SOLDERED TO PCB
TO REDUCE THERMAL RESISTANCE (NOTE 7)
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/W,
θ
JC
= 45°C/W
8 INPUT
7 NC
6 V
–
5 NC
V
–
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
T
JMAX
= 125°C,
θ
JA
= 50°C/W,
θ
JC
= 3°C/W
OUTPUT
BIAS
V
–
(TAB)
V
+
INPUT
ORDER INFORMATION
LEAD FREE FINISH
LT1010CDD#PBF
LT1010CN8#PBF
LT1010CT#PBF
LEAD BASED FINISH
LT1010CDD
LT1010CN8
LT1010CT
TAPE AND REEL
LT1010CDD#TRPBF
LT1010CN8#TRPBF
LT1010CT#TRPBF
TAPE AND REEL
LT1010CDD#TR
LT1010CN8#TR
LT1010CT#TR
PART MARKING
LBWZ
LTC1010CN8
LTC1010CT
PART MARKING
LBWZ
LTC1010CN8
LTC1010CT
PACKAGE DESCRIPTION
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead PDIP
5-Lead Plastic TO-220
PACKAGE DESCRIPTION
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead PDIP
5-Lead Plastic TO-220
TEMPERATURE RANGE
0°C to 100°C
0°C to 100°C
0°C to 100°C
TEMPERATURE RANGE
0°C to 100°C
0°C to 100°C
0°C to 100°C
OBSOLETE PACKAGE
Consult LTC Marketing for parts specified 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 specifications, go to:
http://www.linear.com/tapeandreel/
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LT1010
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Output Offset Voltage
(Note 4)
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (See Note 4. Typical values in curves.)
CONDITIONS (Note 4)
MIN
0
–20
20
0
0
0
0.995
5
5
l
TYP
MAX
150
220
100
250
500
800
1.00
10
10
12
1.0
1.1
0.2
0.3
22
28
UNITS
mV
mV
mV
µA
µA
µA
V/V
Ω
Ω
Ω
V/µs
V
V
V
V
Ω
Ω
mV
mV
mA
mA
V
S
= ±15V, V
IN
= 0V
I
B
A
V
R
OUT
Input Bias Current
I
OUT
= 0mA
I
OUT
≤ 150mA
l
l
Large-Signal Voltage Gain
Output Resistance
I
OUT
= ±1mA
I
OUT
= ±150mA
V
S
= ±15V, V
IN
= ±10V, V
OUT
= ±8V, R
L
= 100Ω
I
OUT
= 0 (Note 5)
Slew Rate
V
SOS+
V
SOS–
R
SAT
V
BIAS
I
S
Positive Saturation Offset
Negative Saturation Offset
Saturation Resistance
Bias Terminal Voltage
Supply Current
75
l
I
OUT
= 0 (Note 5)
l
I
OUT
= ±150mA (Note 5)
l
R
BIAS
= 20Ω (Note 6)
l
700
560
840
880
9
10
I
OUT
= 0, I
BIAS
= 0
l
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:
Dissipation must be based on a thermal resistance. See
Application Information for power dissipation.
Note 3:
In current limit or thermal limit, input current increases sharply
with input-output differentials greater than 8V; so input current must be
limited. Input current also rises rapidly for input voltages 8V above V
+
or
0.5V below V
–
.
Note 4:
Specifications apply for 4.5V ≤ V
S
≤ 40V,
V
–
+ 0.5V ≤ V
IN
≤ V
+
– 1.5V and I
OUT
= 0, unless otherwise stated.
Temperature range is 0°C ≤ T
C
≤ 100°C.
Note 5:
The output saturation characteristics are measured with 100mV
output clipping. See Applications Information for determining available
output swing and input drive requirements for a given load.
Note 6:
The output stage quiescent current can be increased by connecting
a resistor between the BIAS pin and V
+
. The increase is equal to the bias
terminal voltage divided by this resistance.
Note 7:
Thermal resistance varies depending upon the amount of PC board
metal attached to the pin (Pin 9) of the device.
θ
JA
is specified for a certain
amount of 1oz copper metal trace connecting to Pin 9 as described in the
thermal resistance tables in the Applications Information section.
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LT1010
TYPICAL PERFORMANCE CHARACTERISTICS
Bandwidth
50
R
L
= 200
PHASE LAG (DEGREES)
PHASE LAG (DEGREES)
50
Phase Lag
50
Phase Lag
40
FREQUENCY (MHz)
30
R
L
= 50
20
R
L
= 50
R
L
= 200
10
C
L
= 100pF
R
S
= 50
I
BIAS
= 0
T
J
= 25°C
2
10
5
FREQUENCY (MHz)
20
1010 G02
20
R
L
= 50
10
R
L
= 200
20
V
IN
= 100mV
P-P
C
L
100pF
A
V
= –3dB
T
J
= 25°C
0
30
20
10
QUIESCENT CURRENT (mA)
40
1010 G01
10
0
5
5
C
L
= 100pF
R
S
= 50
R
BIAS
= 20
T
J
= 25°C
2
10
5
FREQUENCY (MHz)
20
1010 G03
Small-Step Response
150
100
VOLTAGE CHANGE (mV)
50
INPUT
0
–50
OUTPUT
R
L
= 100
T
J
= 25°C
OUTPUT IMPEDANCE ( )
100
Output Impedance
I
BIAS
= 0
T
J
= 25°C
10
Capacitive Loading
R
S
= 50
I
BIAS
= 0
T
J
= 25°C
VOLTAGE GAIN (dB)
0
3nF
100pF
10
–10
0.1µF
–100
–150
1
–20
0
10
TIME (ns)
20
30
1010 G04
0.1
1
10
FREQUENCY (MHz)
100
1010 G05
0.1
1
10
FREQUENCY (MHz)
100
1010 G06
Slew Response
20
15
OUTPUT VOLTAGE (V)
10
5
0
–5
–10
–15
–20
–50
0
NEGATIVE
R
BIAS
= 20
I
BIAS
= 0
POSITIVE
SLEW RATE (V/µs)
V
S
= ±15V
R
L
= 100
T
J
= 25°C
f ≤ 1MHz
300
400
Negative Slew Rate
V
S
= ±15V
0 ≥ V
IN
≥ –10V
SUPPLY CURRENT (mA)
R
L
= 200
R
L
= 100
200
R
L
= 50
80
Supply Current
V
S
= ±15V
V
IN
= ±10V
I
L
= 0
T
C
= 25°C
60
40
100
20
50
150
100
TIME (ns)
200
250
1010 G07
0
0
20
10
30
QUIESCENT CURRENT (mA)
40
1010 G08
0
0
1
2
3
FREQUENCY (MHz)
4
5
1010 G09
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LT1010
TYPICAL PERFORMANCE CHARACTERISTICS
Output Offset Voltage
200
V
IN
= 0
200
Input Bias Current
V
IN
= 0
200
Input Bias Current
V
S
= ±15V
R
L
= 75
T
J
= 125°C
T
J
= 25°C
OFFSET VOLTAGE (mV)
BIAS CURRENT (µA)
100
V
V
+
= 38V
–
= –2V
V
+
= 2V
V
–
= –38V
V
+
= 38V
V
–
= –2V
100
V
+
= 2V
V
–
= –38V
BIAS CURRENT (µA)
150
150
150
100
50
50
50
T
J
= –55°C
0
–50
0
100
TEMPERATURE (°C)
50
150
1010 G10
0
–50
0
100
TEMPERATURE (°C)
50
150
1010 G11
0
–150
–100
–50
50
100
0
OUTPUT CURRENT (mA)
150
1010 G12
Voltage Gain
1.000
I
OUT
= 0
OUTPUT RESISTANCE ( )
V
S
= 40V
0.999
GAIN (V/V)
12
10
8
6
4
2
0.997
–50
Output Resistance
I
OUT
≤ 150mA
NOISE VOLTAGE (nV/√Hz)
200
Output Noise Voltage
T
J
= 25°C
150
100
R
S
= 1k
R
S
= 50
0
V
S
= 4.5V
0.998
50
0
100
50
TEMPERATURE (°C)
150
1010 G13
0
–50
0
100
50
TEMPERATURE (°C)
150
1010 G14
10
100
1k
FREQUENCY (Hz)
10k
1010 G15
Positive Saturation Voltage
4
I
L
= 150mA
4
Negative Saturation Voltage
7
I
L
= –150mA
Supply Current
V
IN
= 0
I
OUT
= 0
I
BIAS
= 0
SATURATION VOLTAGE (V)
SATURATION VOLTAGE (V)
SUPPLY CURRENT (mA)
3
3
6
T
J
= –55°C
2
I
L
= 50mA
I
L
= 5mA
2
5
T
J
= 25°C
I
L
= –50mA
I
L
= –5mA
1
1
4
T
J
= 125°C
0
–50
0
100
TEMPERATURE (°C)
50
150
1010 G16
0
–50
0
100
TEMPERATURE (°C)
50
150
1010 G17
3
0
20
10
30
TOTAL SUPPLY VOLTAGE (V)
40
1010 G18
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