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Linear Technology Electronic Components Datasheet

LT1970A Datasheet

500mA Power Op Amp

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LT1970A
500mA Power Op Amp with
Adjustable Precision Current Limit
FEATURES
DESCRIPTION
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
APPLICATIONS
n Automatic Test Equipment
n Laboratory Power Supplies
n Motor Drivers
n Thermoelectric Cooler Driver
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.
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 (VCC to V+ and VEE 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.
TYPICAL APPLICATION
Device Power Supply (DPS) with ±500mA Adjustable Current Limit
VLIMIT
0V TO 5V
VIN
20V 20V
VCC V+
EN
6k
+IN
VCSRC
VCSNK
ISNK
ISRC
LT1970A
SENSTSE+DOUT
SENSE
–IN
V
VEE
COMMON
IOUT(MAX)
IOUT
=
±
VLIMIT
10 • RCS
RCS
1/4W
TRACE R TRACE L
100mΩ 200nH
SENSE
4.7µF
ESR
0.1Ω
LOAD
1970A TA01
–5V 10k
100pF
CURRENT LIMIT = 500mA
VLOAD, RLOAD = 100Ω
2V/DIV
0V
VLOAD,
RLOAD = 10Ω
VIN, 5V/DIV
100µs/DIV
For more information www.linear.com/LT1970A
1970A TA01b
1970afb
1


Linear Technology Electronic Components Datasheet

LT1970A Datasheet

500mA Power Op Amp

No Preview Available !

LT1970A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PSNAoumegsppiaptltiliviyfvieeeVrHoHOilgtiugahtghpCeuCu(tuVr(rrCOreeCnUnttTtoS)S.uV.u.p.Ep.Ep.p.)l..yl..y....((..VV....+....)).....................................................................................V.V.V.E.E–.t.o.ttoo3V6VVCVC++
Current Sense Pins
(SENSE+, SENSE, FILTER)............................ Vto V+
Logic Outputs (ISRC, ISNK, TSD)........ COMMON to VCC
Input Voltage (–IN, +IN)............. VEE – 0.3V to VEE + 36V
Input Current.......................................................... 10mA
Current Control Inputs
(VCSRC, VCSNK)............... COMMON to COMMON + 7V
Enable Logic Input............................... COMMON to VCC
COMMON........................................................ VEE to VCC
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
PIN CONFIGURATION
TOP VIEW
VEE 1
V2
OUT 3
SENSE+ 4
FILTER 5
SENSE6
VCC 7
–IN 8
+IN 9
VEE 10
21
–+
20 VEE
19 V+
18 TSD
17 ISNK
16 ISRC
15 ENABLE
14 COMMON
13 VCSRC
12 VCSNK
11 VEE
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 40°C/W (NOTE 8)
EXPOSED PAD (PIN 21) IS CONNECTED TO VEE
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. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. See Test Circuit for standard test conditions.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Power Op Amp Characteristics
UNITS
VOS Input Offset Voltage
Input Offset Voltage Drift (Note 4)
–04°C0°<CT<AT<A7<0°8C5°C
l
l
l –10
200 600
1000
1300
–4 10
µV
µV
µV
µV/°C
IOS Input Offset Current
IB Input Bias Current
Input Noise Voltage
VCM = 0V
VCM = 0V
0.1Hz to 10Hz
l –100
l –600
–160
3
100
nA
nA
µVP-P
1970afb
2 For more information www.linear.com/LT1970A


Part Number LT1970A
Description 500mA Power Op Amp
Maker Linear
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LT1970A Datasheet PDF





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