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LT1970ACFE#TRPBF

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LT1970A
1
1970afc
For more information www.linear.com/LT1970A
2V/DIV
0V
1970A TA01b
100µs/DIV
CURRENT LIMIT = 500mA
V
LOAD
, R
LOAD
= 100Ω
V
LOAD
,
R
LOAD
= 10Ω
V
IN
, 5V/DIV
Typical applicaTion
DescripTion
500mA Power Op Amp with
Adjustable Precision Current Limit
The LT
®
1970A is a ±500mA power op amp with precise
externally controlled current limiting. Separate control
voltages program the sourcing and sinking current limit
sense thresholds with 1% accuracy. Output current may
be boosted by adding external power transistors.
The circuit operates with single or split power supplies
from 5V to 36V total supply voltage. In normal opera
-
tion, the input stage supplies and the output stage sup-
plies are connected (V
CC
to V
+
and V
EE
to V
–
). To reduce
power dissipation it is possible to power the output stage
(V
+
, V
–
) from independent, lower voltage rails. The amplifier
is unity-gain stable with a 3.6MHz gain-bandwidth product
and slews at 1.6V/µs. The LT1970A can drive capacitive
and inductive loads directly.
Open-collector status flags signal current limit circuit
activation, as well as thermal shutdown of the amplifier.
An enable logic input puts the amplifier into a low power,
high impedance output state when pulled low. Thermal
shutdown and a ±800mA fixed current limit protect the
chip under fault conditions.
The LT1970A is packaged in a 20-lead TSSOP package with
a thermally conductive copper bottom plate to facilitate
heat sinking.
Device Power Supply (DPS) with ±500mA Adjustable Current Limit
FeaTures
applicaTions
n
±500mA Minimum Output Current
n
Independent Adjustment of Source and
Sink Current Limits
n
1% Current Limit Accuracy
n
Improved Reactive Load Driving Stability
n
Operates with Single or Split Supplies
n
Shutdown/Enable Control Input
n
Open-Collector Status Flags:
Sink Current Limit
Source Current Limit
Thermal Shutdown
n
Fail-Safe Current Limit and Thermal Shutdown
n
1.6V/µs Slew Rate
n
3.6MHz Gain-Bandwidth Product
n
Specified Temperature Range: –40°C to 85°C
n
Available in a 20-Lead TSSOP Package
n
Automatic Test Equipment
n
Laboratory Power Supplies
n
Motor Drivers
n
Thermoelectric Cooler Driver
V
CC
COMMON
V
EE
V
+
EN
V
–
10k
100pF
VC
SRC
VC
SNK
ISNK
ISRC
SENSE
–
SENSE
SENSE
+
TSD
I
OUT
OUT
R
CS
1Ω
1/4W
TRACE R
100mΩ
TRACE L
200nH
6k
+IN
20V
LT1970A
–5V
20V
–IN
LOAD
ESR
0.1Ω
4.7µF
1970A TA01
V
LIMIT
0V TO 5V
V
IN
V
LIMIT
10 • R
CS
I
OUT(MAX)
= ±
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT1970A
2
1970afc
For more information www.linear.com/LT1970A
absoluTe MaxiMuM raTings
Supply Voltage (V
CC
to V
EE
) ..................................... 36V
Positive High Current Supply (V
+
) ................... V
–
to V
CC
Negative High Current Supply(V
–
) ....................V
EE
to V
+
Amplifier Output (OUT) ..................................... V
–
to V
+
Current Sense Pins
(SENSE
+
, SENSE
–
, FILTER) ........................... V
–
to V
+
Logic Outputs (ISRC, ISNK, TSD) ....... COMMON to V
CC
Input Voltage (–IN, +IN) ............ V
EE
– 0.3V to V
EE
+ 36V
Input Current ......................................................... 10mA
Current Control Inputs
(VC
SRC
, VC
SNK
) ..............COMMON to COMMON + 7V
Enable Logic Input .............................. COMMON to V
CC
COMMON ....................................................... V
EE
to V
CC
Output Short-Circuit Duration ......................... Indefinite
Operating Temperature Range (Note 2)....–40°C to 85°C
Specified Temperature Range (Note 3)
LT1970AC ................................................ 0°C to 70°C
LT1970AI.............................................. –40°C to 85°C
Maximum Junction Temperature.......................... 150°C
Storage Temperature Range ...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Op Amp Characteristics
V
OS
Input Offset Voltage
0°C < T
A
< 70°C
–40°C < T
A
< 85°C
l
l
200 600
1000
1300
µV
µV
µV
Input Offset Voltage Drift (Note 4)
l
–10 –4 10 µV/°C
I
OS
Input Offset Current V
CM
= 0V
l
–100 100 nA
I
B
Input Bias Current V
CM
= 0V
l
–600 –160 nA
Input Noise Voltage 0.1Hz to 10Hz 3 µV
P-P
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. See Test Circuit for standard test conditions.
pin conFiguraTion
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
V
EE
V
–
OUT
SENSE
+
FILTER
SENSE
–
V
CC
–IN
+IN
V
EE
V
EE
V
+
TSD
ISNK
ISRC
ENABLE
COMMON
VC
SRC
VC
SNK
V
EE
+
–
21
T
JMAX
= 150°C, θ
JA
= 40°C/W (NOTE 8)
EXPOSED PAD (PIN 21) IS CONNECTED TO V
EE
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1970ACFE#PBF LT1970ACFE#TRPBF LT1970AFE 20-Lead Plastic TSSOP 0°C to 70°C
LT1970AIFE#PBF LT1970AIFE#TRPBF LT1970AFE 20-Lead Plastic TSSOP –40°C to 85°C
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
LT1970A
3
1970afc
For more information www.linear.com/LT1970A
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. See Test Circuit for standard test conditions.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
e
n
Input Noise Voltage Density 1kHz 15 nV/√Hz
i
n
Input Noise Current Density 1kHz 3 pA/√Hz
R
IN
Input Resistance Common Mode
Differential Mode
500
100
kΩ
kΩ
C
IN
Input Capacitance Pin 8 and Pin 9 to Ground 6 pF
V
CM
Input Voltage Range Typical
Guaranteed by CMRR Test
l
–14.5
–12.0
13.6
12.0
V
V
CMRR Common Mode Rejection Ratio –12V < V
CM
< 12V
l
92 105 dB
PSRR Power Supply Rejection Ratio V
EE
= V
–
= –5V, V
CC
= V
+
= 3V to 30V
V
EE
= V
–
= –5V, V
CC
= 30V, V
+
= 2.5V to 30V
V
EE
= V
–
= –3V to –30V, V
CC
= V
+
= 5V
V
EE
= –30V, V
–
= –2.5V to –30V, V
CC
= V
+
= 5V
l
l
l
l
90
110
90
110
100
130
100
130
dB
dB
dB
dB
A
VOL
Large-Signal Voltage Gain R
L
= 1k, –12.5V < V
OUT
< 12.5V
l
100
75
150 V/mV
V
/mV
R
L
= 100Ω, –12.5V < V
OUT
< 12.5V
l
80
40
120 V/mV
V
/mV
R
L
= 10Ω, –5V < V
OUT
< 5V, V
+
= –V
–
= 8V
l
20
5
45 V/mV
V
/mV
V
OL
Output Sat Voltage Low V
OL
= V
OUT
– V
–
R
L
= 100, V
CC
= V
+
= 15V, V
EE
= V
–
= –15V
R
L
= 10, V
CC
= –V
EE
= 15V, V
+
= –V
–
= 5V
l
1.9
0.8
2.5
V
V
V
OH
Output Sat Voltage High V
OH
= V
+
– V
OUT
R
L
= 100, V
CC
= V
+
= 15V, V
EE
= V
–
= –15V
R
L
= 10, V
CC
= –V
EE
= 15V, V
+
= –V
–
= 5V
l
1.7
1.0
2.3
V
V
I
SC
Output Short-Circuit Current Output Low, R
SENSE
= 0Ω
Output High, R
SENSE
= 0Ω
500
–1000
800
–800
1200
–500
mA
mA
SR Slew Rate –10V < V
OUT
< 10V, R
L
= 1k 0.7 1.6 V/µs
FPBW Full Power Bandwidth V
OUT
= 10V
PEAK
(Note 5) 11 kHz
GBW Gain-Bandwidth Product f = 10kHz 3.6 MHz
t
S
Settling Time 0.01%, V
OUT
= 0V to 10V, A
V
= –1, R
L
= 1k 8 µs
Current Sense Characteristics
V
SENSE(MIN)
Minimum Current Sense Voltage VC
SRC
= VC
SNK
= 0V
l
0.1
0.1
4 7
10
mV
mV
V
SENSE(4%)
Current Sense Voltage 4% of Full Scale VC
SRC
= VC
SNK
= 0.2V
l
15 20 25 mV
V
SENSE(10%)
Current Sense Voltage 10% of Full Scale VC
SRC
= VC
SNK
= 0.5V
l
45 50 55 mV
V
SENSE(FS)
Current Sense Voltage 100% of Full Scale VC
SRC
= VC
SNK
= 5V
l
495
480
500
500
505
520
mV
mV
I
BI
Current Limit Control Input Bias Current VC
SRC
, VC
SNK
Pins
l
–1 –0.2 0.1 µA
I
SENSE
– SENSE
–
Input Current 0V < (VC
SRC
, VC
SNK
) < 5V
l
–500 500 nA
I
FILTER
FILTER Input Current 0V < (VC
SRC
, VC
SNK
) < 5V
l
–500 500 nA
I
SENSE
+ SENSE
+
Input Current VC
SRC
= VC
SNK
= 0V
VC
SRC
= 5V, VC
SNK
= 0V
VC
SRC
= 0V, VC
SNK
= 5V
VC
SRC
= VC
SNK
= 5V
l
l
l
l
–500
200
–300
–25
250
–250
500
300
–200
25
nA
µA
µA
µA
Current Sense Change with Output Voltage
VC
SRC
= VC
SNK
= 5V, –12.5V < V
OUT
< 12.5V ±0.1 %
Current Sense Change with Supply Voltage VC
SRC
= VC
SNK
= 5V, 6V < (V
CC
, V
+
) < 18V
2.5V < V
+
< 18V, V
CC
= 18V
–18V < (V
EE
, V
–
) < –2.5V
–18V < V
–
< –2.5V, V
EE
= –18V
±0.05
±0.01
±0.05
±0.01
%
%
%
%
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LT1970ACFE#TRPBF

Mfr. #:
Buy LT1970ACFE#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Operational Amplifiers - Op Amps 500mA Power OA with Adj. Current Limit
Lifecycle:
New from this manufacturer.
Delivery:
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