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Analog Devices Inc. LT1970AIFE#PBF
- Part No.:
- LT1970AIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1970AIFE#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:448
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Product details
Overview
LT1970AIFE#PBF from Analog Devices (formerly Linear Technology) is a ±500mA precision power operational amplifier with independently adjustable sourcing/sinking current limits, 1% limit accuracy, 3.6MHz gain-bandwidth product, and 1.6V/µs slew rate. It operates from 5V to 36V total supply voltage and drives reactive loads directly in laboratory power supplies and thermoelectric cooler drivers.
For engineers reviewing the LT1970AIFE#PBF datasheet, LT1970AIFE#PBF pinout, LT1970AIFE#PBF application, or LT1970AIFE#PBF equivalent, key selection criteria include its dual independent current limit control (VCSRC/VCSNK), open-collector status flags (ISRC/ISNK/TSD), thermal shutdown protection, enable-controlled high-impedance output state, and TSSOP-20 package with exposed thermal pad.
Technical Context
The LT1970AIFE#PBF integrates a unity-gain-stable main op amp (GM1) with ±500mA output capability and two high-transconductance current limit amplifiers (ISRC/ISNK) that decouple the main signal path when VSENSE reaches VCSRC/10 (sourcing) or –VCSNK/10 (sinking). Its architecture supports Kelvin-sensed load connections via OUT–SENSE+–SENSE– routing.
It features split-supply flexibility: VCC/VEE powers the input/control circuitry while V+/V– independently powers the output stage to reduce dissipation; COMMON reference enables level-shifting of logic I/O; and the exposed thermal pad (Pin 21) connects to VEE for enhanced heat sinking in high-current operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±500mA continuous; ±800mA fail-safe fixed limit protects chip during sense resistor faults |
| Current Limit Accuracy | 1% over temperature; enables precise programmable current sources/sinks without calibration |
| Gain-Bandwidth Product | 3.6MHz; supports stable closed-loop operation up to ~300kHz at AV = 12 with adequate phase margin |
| Slew Rate | 1.6V/µs; ensures <8µs settling to 0.01% for 10V step into 1kΩ load |
| Supply Range | 5V to 36V total (VCC–VEE); V+/V– rails may be independently set lower than VCC/VEE to minimize power loss |
| Operating Temperature | –40°C to +85°C; specified performance guaranteed across full industrial range (LT1970AI grade) |
| Package | 20-lead TSSOP with exposed copper thermal pad (Pin 21 = VEE); θJA = 40°C/W with proper PCB copper |
Pinout & Package
LT1970AIFE#PBF is housed in a 20-lead plastic TSSOP package with an exposed thermal pad (Pin 21) electrically connected to VEE. The package requires soldering the exposed pad to a VEE-connected PCB copper area for effective thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pins 1,10,11,20,21) | Substrate reference & negative supply | Most negative potential on board; all VEE pins must connect to same net; exposed pad (21) is VEE |
| V– (Pin 2) | Output stage negative supply | Carries only output-stage current; may be set less negative than VEE to drive external boost transistors |
| OUT (Pin 3) | Main amplifier output | Force node in Kelvin sensing; directly connects to SENSE+ and load; current-limited to ±800mA |
| SENSE+ (Pin 4) | Positive current sense input | Connected to OUT/load side of sense resistor; sourcing limit triggers when V(SENSE+–SENSE–) = VCSRC/10 |
| FILTER (Pin 5) | Current sense filter node | Optional RC filter (1kΩ internal + external cap) to adjust current limit response time; usually left open |
| SENSE– (Pin 6) | Negative current sense input | Connected to load ground side; sinking limit triggers when V(SENSE+–SENSE–) = –VCSNK/10 |
| VCC (Pin 7) | Input/control stage positive supply | Powers all circuitry except output transistors; must be ≥ V+ |
| –IN (Pin 8) | Inverting input | High-impedance input (6pF, 100kΩ); accepts common-mode voltages from VEE–0.3V to VEE+36V |
| +IN (Pin 9) | Noninverting input | High-impedance input; same voltage range as –IN; maintains isolation during current limiting |
| VCSNK (Pin 12) | Sink current limit control | 0V–5V input referenced to COMMON; sets sinking limit threshold at –VCSNK/10 on SENSE pins |
| VCSRC (Pin 13) | Source current limit control | 0V–5V input referenced to COMMON; sets sourcing limit threshold at +VCSRC/10 on SENSE pins |
| COMMON (Pin 14) | Logic reference node | Reference for ENABLE, ISRC, ISNK, TSD; may float between VEE and VCC–3V; typically grounded |
| ENABLE (Pin 15) | Enable/disable control | TTL-compatible input; low = high-Z output, <1.5mA supply current; best method to force zero IOUT |
| ISRC (Pin 16) | Sourcing limit flag | Open-collector output; pulls low when sourcing limit is active; sinks up to 10mA |
| ISNK (Pin 17) | Sinking limit flag | Open-collector output; pulls low when sinking limit is active; sinks up to 10mA |
| TSD (Pin 18) | Thermal shutdown flag | Open-collector output; pulls low at ~160°C junction temp; signals need to reduce load or improve cooling |
| V+ (Pin 19) | Output stage positive supply | Carries only output-stage current; may be set lower than VCC to reduce dissipation or drive external boost devices |
Key Features
| Feature | Design Value |
|---|---|
| Independent source/sink current limit control | VCSRC and VCSNK accept separate 0–5V inputs to set asymmetric sourcing/sinking thresholds with 1% accuracy |
| Reactive load stability | Unity-gain stable with direct capacitive/inductive load drive; no external compensation required up to 30nF |
| Fail-safe protection | ±800mA fixed output current limit and thermal shutdown activate even if external sense resistor fails open/short |
| Flexible supply architecture | VCC/VEE and V+/V– can be independently biased to minimize power loss in high-current, low-voltage output stages |
| Status monitoring | Three open-collector flags (ISRC/ISNK/TSD) allow wired-OR fault reporting to microcontroller interrupt lines |
Applications
| Automatic Test Equipment (ATE) | Laboratory Power Supplies |
|---|---|
Use Scenario: Precision programmable current source for semiconductor device characterization under varying voltage bias. IC Role / Device Role / Timing Role: LT1970AIFE#PBF acts as the high-accuracy, high-slew-rate current source core, with VCSRC/VCSNK dynamically adjusted per DUT requirements. Use Value: Enables sub-1% current accuracy across temperature without recalibration, reducing test system drift and improving yield analysis fidelity. |
Use Scenario: Benchtop DC power supply delivering stable, current-limited output for prototype validation and component burn-in. IC Role / Device Role / Timing Role: LT1970AIFE#PBF serves as the regulated output stage, providing both voltage and current regulation with real-time fault signaling. Use Value: Dual independent current limits prevent accidental overload damage to DUTs; TSD flag enables automatic shutdown before thermal stress occurs. |
| Motor Drivers | Thermoelectric Cooler (TEC) Driver |
Use Scenario: H-bridge gate driver auxiliary current monitor for brushed DC motor stall detection and commutation timing. IC Role / Device Role / Timing Role: LT1970AIFE#PBF monitors motor winding current via low-side sense resistor, triggering ISNK/ISRC flags for controller response. Use Value: 4µs current limit activation time allows fast stall detection before winding overheating; open-collector flags interface directly with MCU GPIOs. |
Use Scenario: Bipolar current source driving Peltier elements requiring precise bidirectional current control for temperature stabilization. IC Role / Device Role / Timing Role: LT1970AIFE#PBF functions as the linear TEC driver, using VCSRC/VCSNK to set symmetric heating/cooling current limits. Use Value: 1% current limit accuracy ensures repeatable ΔT control; ±500mA output handles typical 3–5W TEC modules without external boost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3083EST#PBF | Adjustable 1.1A LDO regulator with current limit; no op amp functionality, no dual sourcing/sinking control | Used where only regulated current output is needed, not voltage-controlled current sourcing/sinking | Choose LT3083EST#PBF for simpler constant-current biasing; choose LT1970AIFE#PBF when op amp feedback topology and independent sink/source limits are required |
| OPA548T | Single-supply 3A power op amp; no programmable current limit, no status flags, no ENABLE, SO-20 package | Used in high-current, single-polarity applications like audio amplification or solenoid drivers | Choose OPA548T for higher output current without limit control; choose LT1970AIFE#PBF when precision programmable bidirectional current limiting and fault monitoring are essential |
Compared with LT3083EST#PBF and OPA548T, the LT1970AIFE#PBF uniquely combines op amp configurability, independent sourcing/sinking current limit programming, real-time open-collector fault flags, and enable-controlled high-impedance state - making it irreplaceable in precision bipolar current source designs requiring diagnostic visibility and thermal safety.
Availability
LT1970AIFE#PBF is available at Aetrix Electronics and suitable for laboratory power supplies, automatic test equipment, thermoelectric cooler drivers, and motor control systems requiring stable component supply with guaranteed industrial temperature range performance.
Supply support for LT1970AIFE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1970AIFE#PBF belongs to ADI's precision power op amp product line, designed specifically for applications demanding accurate, programmable bidirectional current limiting with integrated fault monitoring and thermal protection.
FAQ
What is the maximum continuous output current of the LT1970AIFE#PBF?
The LT1970AIFE#PBF delivers ±500mA continuous output current. It also incorporates a ±800mA fail-safe fixed current limit that activates if the external precision current sense resistor becomes disconnected or shorted, protecting the on-chip output transistors under fault conditions.
How does the LT1970AIFE#PBF achieve independent sourcing and sinking current limits?
The LT1970AIFE#PBF uses two dedicated control inputs: VCSRC (Pin 13) sets the sourcing limit threshold as VSENSE = VCSRC/10, while VCSNK (Pin 12) sets the sinking limit as VSENSE = –VCSNK/10. This allows asymmetric current limiting - for example, +400mA/–600mA - critical for TEC and motor control applications.
Can the LT1970AIFE#PBF drive capacitive loads without oscillation?
Yes, the LT1970AIFE#PBF is unity-gain stable and can drive capacitive loads directly. Typical performance data shows stable operation with up to 30nF load capacitance at AV = 1; larger values may require series resistance at the output to maintain phase margin, especially above 100kHz.
What is the function of the exposed thermal pad (Pin 21) on the LT1970AIFE#PBF?
The exposed thermal pad (Pin 21) is electrically connected to VEE and must be soldered to a VEE-referenced copper pour on the PCB. This connection reduces thermal resistance (θJA = 40°C/W with proper layout) and prevents thermal shutdown during sustained ±500mA operation, especially in compact enclosures.
How do the ISRC, ISNK, and TSD pins operate on the LT1970AIFE#PBF?
ISRC, ISNK, and TSD are open-collector logic outputs that pull low when their respective conditions occur: ISRC during sourcing current limit, ISNK during sinking current limit, and TSD during thermal shutdown (≈160°C). Each sinks up to 10mA and can be wired together for OR'ed fault reporting to a single MCU interrupt pin.
LT1970AIFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.6V/µs
- Gain Bandwidth Product:
- 3.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 160 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT1970AIFE#PBF FAQ
1.How can I place an order for LT1970AIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1970AIFE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1970AIFE#PBF reliable?
The price and inventory of LT1970AIFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1970AIFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1970AIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1970AIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1970AIFE#PBF?
LT1970AIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1970AIFE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1970AIFE#PBF?
For technical support, including LT1970AIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1970AIFE#PBF requirements.
6.How does Aetrix verify that LT1970AIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1970AIFE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1970AIFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1970AIFE#PBF?
All LT1970AIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1970AIFE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1970AIFE#PBF part is unused and in its original packaging.
Return procedure for LT1970AIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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