LT1970AIFE#TRPBF - ±500mA Power Op Amp | Analog Devices
MPN: LT1970AIFE#TRPBF ✓ פעילLT1970AIFE#TRPBF סקירה
A power operational amplifier (power op amp) is a specialized high-current linear amplifier that combines the precision of a small-signal op amp with the drive capability of an output stage typically rated from hundreds of milliamps to several amps. Within the broader hierarchy, power op amps sit under operational amplifiers -> amplifiers -> analog ICs -> signal conditioning -> semiconductors. They are commonly used as programmable voltage or current sources, motor drivers, and audio amplifiers where a standard op amp cannot deliver sufficient load current.
Key features include ±500mA minimum output current, 1.6 V/µs slew rate, independent adjustment of source and sink current limits, single or split supply operation from 5V to 36V total, and thermal shutdown. The exposed pad (TSSOP-EP) package provides a low thermal resistance path, which is critical for sustaining 500mA continuous output. The current-limit architecture uses two external programming voltages, enabling asymmetric sourcing and sinking limits for applications such as Class-AB audio or solenoid drive.
Internally the LT1970A uses a bipolar output stage with a precision current-sense scheme that compares each external limit voltage against an internal VBE-referenced sense threshold. The 1% limit accuracy (improved from the LT1970's 2%) reduces output stage stress and enables tighter compliance envelopes in regulated current sources. Single-supply operation is supported by an internal charge pump, allowing the output to swing within a few hundred millivolts of each rail.
Typical applications include programmable current sources, solenoid and valve drivers, audio amplifiers (Class A, B, AB), motor drivers, and transducer excitation. The TSSOP-EP footprint is well suited for compact industrial and instrumentation designs that require high current density on a small PCB.
When designing with this part, dedicate a generous copper pour under the exposed pad to keep junction temperature within the 150°C absolute maximum. Decouple both supply rails close to the IC with 1µF X7R ceramics in parallel with 10µF bulk; the high output current makes supply-impedance-induced ringing a real concern.
This page consolidates distributor pricing, drop-in same-package alternatives, application circuits, and PCB-level design notes that are not aggregated in the manufacturer datasheet alone.
חלופות תחליף ישיר עבור LT1970AIFE#TRPBF — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
LT1970IFE#PBF
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LT1970AIFE#PBF
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LT1970CFE#PBF
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LT1970CFE#TRPBF
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LT1970AIFE
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LT1970AIFE#TRPBF דירוגים מרביים ומאפיינים חשמליים
| Amplifier Type | Power Operational Amplifier |
| Number of Circuits | 1 |
| Output Current (Minimum) | ±500 mA |
| Supply Voltage (Total, Single or Split) | 5 V to 36 V |
| Current Limit Accuracy | 1% |
| Slew Rate | 1.6 V/µs |
| Current Limit Adjustment | Independent source and sink (separate V/I control pins) |
| Output Stage Architecture | Bipolar, can be boosted with external power transistors |
| מארז / Case | 20-TSSOP-EP (4.40 mm body, exposed pad) |
| סוג הרכבה | Surface Mount |
| טמפרטורת פעולה | -40°C to +85°C (Industrial) |
| Packaging | Tape & Reel (TR) |
| רמת MSL | 1 |
| סטטוס RoHS | Compliant |
| Single-Supply Operation | Yes (internal charge pump) |
| External Current Boost | Supported via external power transistors |
תצורת פינים של LT1970AIFE#TRPBF
| פין 1 | OUT — Amplifier output |
| פין 2 | V+ — Positive supply |
| פין 3 | V- — Negative supply (or GND in single-supply) |
| פין 4 | ILIM-SRC — Source current limit programming |
| פין 5 | ILIM-SINK — Sink current limit programming |
| פין 6 | VSENSE — Current sense input |
| פין 7 | IN+ — Non-inverting input |
| פין 8 | IN- — Inverting input |
| פין 9 | NC — Not connected (per datasheet) |
| פין 10 | NC — Not connected (per datasheet) |
| פין 11 | NC — Not connected (per datasheet) |
| פין 12 | NC — Not connected (per datasheet) |
| פין 13 | NC — Not connected (per datasheet) |
| פין 14 | NC — Not connected (per datasheet) |
| פין 15 | NC — Not connected (per datasheet) |
| פין 16 | NC — Not connected (per datasheet) |
| פין 17 | NC — Not connected (per datasheet) |
| פין 18 | NC — Not connected (per datasheet) |
| פין 19 | NC — Not connected (per datasheet) |
| פין 20 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
LT1970AIFE#TRPBF מתאים עבור 6 יישוםs: Programmable Precision Current Source, Solenoid and Valve Driver, Audio Power Amplifier (Class A/AB), DC Motor Driver (Brushed, Low Power), Transducer Excitation Amplifier, Battery Charging / Current Limited Supply.
Programmable Precision Current Source
The LT1970AIFE#TRPBF's 1% accurate current limit and ±500 mA output make it ideal for 4-wire regulated current sources used in transducer excitation, LED drive, and test equipment. With independent source and sink limit programming pins, designers can set compliance envelopes asymmetrically — for example, 200 mA source and 50 mA sink for a diode laser. The 5V–36V supply range supports direct connection to industrial ±15 V or 24 V rails without additional regulation. Place a precision reference (e.g., LT1461 designed) at the current-limit control input to retain 1% accuracy over temperature.
מומלץ
Solenoid and Valve Driver
Industrial solenoid and proportional valve drivers require high peak current (300–500 mA) with tight limits to prevent coil overheating. The LT1970AIFE#TRPBF delivers exactly this: ±500 mA continuous output, independent source/sink limits, and a 5V–36V supply that accepts 12 V and 24 V industrial buses directly. The exposed pad TSSOP-EP package sustains continuous 500 mA with proper copper pour, while the integrated thermal shutdown protects the coil and IC from stall conditions. Free-wheeling diode footprint on the PCB allows inductive kickback protection per the datasheet typical connection diagram.
מומלץ
Audio Power Amplifier (Class A/AB)
The LT1970AIFE#TRPBF is widely used in audiophile-grade Class-A and Class-AB headphone or line amplifiers where its ±500 mA output drives low-impedance headphones (32 Ω) without a separate buffer stage. The 1.6 V/µs slew rate is sufficient for full-range audio, while the 1% current limit prevents output-stage saturation and protects sensitive headphones from DC faults. The exposed-pad TSSOP package enables compact PCB layouts for portable audio applications. Asymmetric source/sink limits can be set to optimize Class-AB bias, reducing crossover distortion.
מומלץ
DC Motor Driver (Brushed, Low Power)
Small brushed DC motors in robotics, valve actuators, and consumer appliances draw 200–500 mA stall current and benefit from programmable current limiting. The LT1970AIFE#TRPBF can drive such motors in H-bridge or single-ended configurations, with independent source and sink current limits allowing separate start-up and running current profiles. The 36 V absolute maximum covers 24 V and 28 V industrial bus voltages. Use the IC's output disable feature (via current-limit pins) to implement PWM speed control without external logic.
מומלץ
Transducer Excitation Amplifier
Strain gauge, RTD, and bridge-type sensors require a precision excitation source with well-defined compliance limits. The LT1970AIFE#TRPBF can be configured as a Howland current pump or a simple voltage-to-current converter, providing up to 500 mA with 1% limit accuracy for self-heating-compensated sensor drive. The 5V–36V supply supports 10 V and 15 V sensor excitation standards, while the TSSOP-EP package enables compact instrumentation front ends. Its bipolar output stage delivers true bidirectional current for AC excitation schemes.
מומלץ
Battery Charging / Current Limited Supply
Linear battery chargers for small Li-Ion or NiMH packs benefit from the LT1970AIFE#TRPBF's programmable current limit. With the source current limit set by an external reference, the IC delivers a constant charging current up to 500 mA while the sink limit can be set near zero to prevent discharge. The 5V–36V input covers single-cell to multi-cell packs with a wide input margin. Thermal protection via the exposed pad integrates with the IC's shutdown to prevent thermal runaway during fault conditions.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LT1970AIFE#TRPBF — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | LT1970IFE#PBF | LT1970AIFE#PBF | LT1970CFE#PBF | LT1970CFE#TRPBF | LT1970AIFE |
|---|---|---|---|---|---|---|
| Package | 20-TSSOP-EP | 20-TSSOP-EP (same) | 20-TSSOP-EP (same) | 20-TSSOP-EP (same) | 20-TSSOP-EP (same) | 20-TSSOP-EP (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current (Min) | ±500 mA | ±500 mA | ±500 mA | ±500 mA | ±500 mA | ±500 mA |
| Current Limit Accuracy | 1% | 2% | 1% | 2% | 2% | 1% |
| Operating Temperature | -40°C to +85°C (Industrial) | -40°C to +85°C (Industrial) | -40°C to +85°C (Industrial) | 0°C to +70°C (Commercial) | 0°C to +70°C (Commercial) | -40°C to +85°C (Industrial) |
| Supply Voltage (Total) | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V |
| Slew Rate | 1.6 V/µs | 1.6 V/µs | 1.6 V/µs | 1.6 V/µs | 1.6 V/µs | 1.6 V/µs |
| Packaging | Tape & Reel | Tube | Tube | Tube | Tape & Reel | Tray/Tube |
מבדילים עיקריים
- 1% current-limit accuracy (A-grade) vs 2% on the original LT1970 (לעומתLT1970IFE#PBF)
- Industrial temperature grade -40°C to +85°C (לעומתLT1970CFE#TRPBF)
- Independent source and sink current limit programming (לעומתLT1970AIFE#PBF (same die, tube packaging))
הערות תכנון
Estimated: At ±15 V supply, full ±500 mA load, and continuous DC operation, the LT1970AIFE#TRPBF can dissipate up to 7.5 W per supply pair. The TSSOP-EP package relies entirely on the exposed pad for heat removal. Design a minimum 1 square inch of 2 oz copper pour on top and bottom layers stitched with thermal vias to keep junction temperature below 125°C. Without this, the internal thermal shutdown will activate during sustained high-current operation, disrupting the load.
Decouple both V+ and V- pins with 1 µF X7R ceramic capacitors placed within 5 mm of the pins, supplemented by a 10 µF bulk tantalum or aluminum polymer capacitor. The exposed pad must be soldered to a ground pour — incomplete solder contact will raise thermal resistance and cause premature shutdown. Use a star-ground topology at the IC for low-level signal returns, especially in audio applications where ground loops introduce hum.
Do not exceed the 36 V total supply rating; transients from inductive loads or motor back-EMF can easily exceed this. Add a TVS diode or Schottky flyback across the load when driving solenoids or motors. The current-limit programming inputs (ILIM-SRC, ILIM-SINK) reference an internal precision node — do not leave them floating; tie them to a reference voltage even if the default maximum limit is acceptable. In single-supply mode, ensure the input common-mode voltage is within the input stage's range including ground.
מידע על תאימות
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified — the LT1970A is not marketed for automotive safety-critical applications. Halogen-free per JEDEC JS709B declaration on the manufacturer page.
