Datasheet LT1970 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 500mA Power Op Amp with Adjustable Precision Current Limit |
| Pages / Page | 26 / 1 — FeaTures. DescripTion. ± 500mA Minimum Output Current. Independent … |
| File Format / Size | PDF / 402 Kb |
| Document Language | English |
FeaTures. DescripTion. ± 500mA Minimum Output Current. Independent Adjustment of Source and. Sink Current Limits
Model Line for this Datasheet
Text Version of Document
LT1970 500mA Power Op Amp with Adjustable Precision Current Limit
FeaTures DescripTion
n
± 500mA Minimum Output Current
The LT®1970 is a ±500mA power op amp with precise n
Independent Adjustment of Source and
externally controlled current limiting. Separate control
Sink Current Limits
voltages program the sourcing and sinking current limit n
2% Current Limit Accuracy
sense thresholds with 2% accuracy. Output current may n Operates with Single or Split Supplies be boosted by adding external power transistors. n Shutdown/Enable Control Input The circuit operates with single or split power supplies n Open Collector Status Flags: from 5V to 36V total supply voltage. In normal operation, Sink Current Limit the input stage supplies and the output stage supplies are Source Current Limit connected (VCC to V+ and VEE to V–). To reduce power Thermal Shutdown dissipation it is possible to power the output stage (V+, n Fail Safe Current Limit and Thermal Shutdown V–) from independent, lower voltage rails. The amplifier is n 1.6V/µs Slew Rate unity-gain stable with a 3.6MHz gain bandwidth product n 3.6MHz Gain Bandwidth Product and slews at 1.6V/µs. The current limit circuits operate n Fast Current Limit Response: 2MHz Bandwidth with a 2MHz response between the VC n SRC or VCSNK control Specified Temperature Range: –40°C to 85°C inputs and the amplifier output. n Available in a 20-Lead TSSOP Package Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier.
applicaTions
An enable logic input puts the amplifier into a low power, n Automatic Test Equipment high impedance output state when pulled low. Thermal n Laboratory Power Supplies shutdown and a ±800mA fixed current limit protect the n Motor Drivers chip under fault conditions. n Thermoelectric Cooler Driver The LT1970 is packaged in a 20-lead TSSOP package with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a thermally conductive copper bottom plate to facilitate Technology Corporation. All other trademarks are the property of their respective owners. heat sinking.
Typical applicaTion AV = 2 Amplifier with Adjustable ±500mA Full-Scale Current Limited Sinewave Into 10
Ω
Load Current Limit and Fault Indication
VLIMIT 0V TO 5V 15V 15V V 4V LIMIT 3k IOUT(LIMIT) = ±10 • R VCC CS 2V V+ENVC V 0V V LOAD IN +IN SRC VCSNK –2V ISNK RCS ISRC IOUT 1Ω TSD 1/4W LT1970 OUT SENSE+ SENSE– V– R1 LOAD VCSRC = 4V 20µs/DIV –IN V 1970 TA02 EE 10k VC COMMON SNK = 2V RCS = 1Ω R2 10k –15V 1970 TA01 1970fe For more information www.linear.com/LT1970 1 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Related Parts
FeaTures DescripTion
n
± 500mA Minimum Output Current
The LT®1970 is a ±500mA power op amp with precise n
Independent Adjustment of Source and
externally controlled current limiting. Separate control
Sink Current Limits
voltages program the sourcing and sinking current limit n
2% Current Limit Accuracy
sense thresholds with 2% accuracy. Output current may n Operates with Single or Split Supplies be boosted by adding external power transistors. n Shutdown/Enable Control Input The circuit operates with single or split power supplies n Open Collector Status Flags: from 5V to 36V total supply voltage. In normal operation, Sink Current Limit the input stage supplies and the output stage supplies are Source Current Limit connected (VCC to V+ and VEE to V–). To reduce power Thermal Shutdown dissipation it is possible to power the output stage (V+, n Fail Safe Current Limit and Thermal Shutdown V–) from independent, lower voltage rails. The amplifier is n 1.6V/µs Slew Rate unity-gain stable with a 3.6MHz gain bandwidth product n 3.6MHz Gain Bandwidth Product and slews at 1.6V/µs. The current limit circuits operate n Fast Current Limit Response: 2MHz Bandwidth with a 2MHz response between the VC n SRC or VCSNK control Specified Temperature Range: –40°C to 85°C inputs and the amplifier output. n Available in a 20-Lead TSSOP Package Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier.
applicaTions
An enable logic input puts the amplifier into a low power, n Automatic Test Equipment high impedance output state when pulled low. Thermal n Laboratory Power Supplies shutdown and a ±800mA fixed current limit protect the n Motor Drivers chip under fault conditions. n Thermoelectric Cooler Driver The LT1970 is packaged in a 20-lead TSSOP package with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a thermally conductive copper bottom plate to facilitate Technology Corporation. All other trademarks are the property of their respective owners. heat sinking.
Typical applicaTion AV = 2 Amplifier with Adjustable ±500mA Full-Scale Current Limited Sinewave Into 10
Ω
Load Current Limit and Fault Indication
VLIMIT 0V TO 5V 15V 15V V 4V LIMIT 3k IOUT(LIMIT) = ±10 • R VCC CS 2V V+ENVC V 0V V LOAD IN +IN SRC VCSNK –2V ISNK RCS ISRC IOUT 1Ω TSD 1/4W LT1970 OUT SENSE+ SENSE– V– R1 LOAD VCSRC = 4V 20µs/DIV –IN V 1970 TA02 EE 10k VC COMMON SNK = 2V RCS = 1Ω R2 10k –15V 1970 TA01 1970fe For more information www.linear.com/LT1970 1 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Related Parts
