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Analog Devices Inc. LT1970IFE
- Part No.:
- LT1970IFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1970IFE.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,725
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Product details
Overview
LT1970IFE from Analog Devices (formerly Linear Technology) is a ±500mA precision power operational amplifier with independently adjustable sourcing/sinking current limits, 2% limit accuracy, 3.6MHz gain bandwidth, and 1.6V/µs slew rate. It operates from 5V to 36V total supply, supports split or single rails, and integrates open-collector fault flags (ISRC, ISNK, TSD) and TTL-compatible enable control - used in laboratory power supplies and thermoelectric cooler drivers where programmable current limiting and thermal protection are critical.
For engineers reviewing the LT1970IFE datasheet, LT1970IFE pinout, LT1970IFE application, or LT1970IFE equivalent, this page delivers verified technical context, validated package mapping (20-lead TSSOP with exposed VEE pad), confirmed pin functions for Kelvin-sense current control, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The LT1970IFE implements a unity-gain-stable main op amp (GM1) with ±500mA output drive, augmented by two high-transconductance current-limit amplifiers (ISRC, ISNK) that take control of the output node when VSENSE = (VCSRC/10) or –(VCSNK/10), enabling precise external voltage-programmed current limiting. Its architecture separates input-stage (VCC/VEE) and output-stage (V+/V–) supplies to reduce dissipation, with independent decoupling paths.
Current-limit response is specified at 2MHz bandwidth from VCSRC/VCSNK to OUT, and fault detection uses open-collector status outputs referenced to COMMON - ISRC asserts during sourcing limit activation, ISNK during sinking limit, and TSD during thermal shutdown (>160°C junction). The ENABLE pin (TTL threshold, 0.8V–2.5V) forces high-impedance output and reduces supply current to ≤1.5mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±500mA minimum continuous; ±800mA fixed fail-safe limit protects chip during sense-resistor faults. |
| Current Limit Accuracy | 2% over –40°C to 85°C; enables precise programmable current regulation without calibration. |
| Gain Bandwidth Product | 3.6MHz; supports stable closed-loop operation up to AV = 2 with full-power bandwidth >11kHz into 10Ω. |
| Slew Rate | 1.6V/µs; ensures fast transient response in motor or TEC driver applications with resistive loads. |
| Supply Voltage Range | 5V to 36V total (VCC–VEE); allows flexible rail configurations including independent V+/V– for thermal optimization. |
| Operating Temperature | –40°C to 85°C (industrial grade); guaranteed performance across full range, not extrapolated. |
| Package | 20-lead TSSOP with exposed copper pad tied to VEE; enables direct PCB heat sinking for >2W dissipation. |
Pinout & Package
LT1970IFE is housed in a 20-lead plastic TSSOP (FE package) with an exposed thermally conductive copper bottom plate electrically connected to VEE. The package requires soldering the exposed pad to a VEE-referenced PCB copper area for effective thermal management (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pins 1,10,11,20) | Substrate reference & negative supply | Must be most negative potential; ties to die substrate and exposed pad - all unused pins left open. |
| V– (Pin 2) | Output stage negative supply | Carries only output-stage current; may be lower magnitude than VEE to drive external boost transistors. |
| OUT (Pin 3) | Main amplifier output | Kelvin-connected to load and SENSE+; includes ±800mA internal fail-safe current limit. |
| SENSE+ (Pin 4) | Positive current sense input | Connected to load side of external sense resistor; activates sourcing limit when VSENSE = VCSRC/10. |
| SENSE– (Pin 6) | Negative current sense input | Connected to ground/load return; activates sinking limit when VSENSE = –VCSNK/10. |
| VCSRC (Pin 13) | Source current limit control | 0V–5V input referenced to COMMON; sets sourcing limit threshold with 10× attenuation. |
| VCSNK (Pin 12) | Sink current limit control | 0V–5V input referenced to COMMON; sets sinking limit threshold with 10× attenuation. |
| ENABLE (Pin 15) | Digital enable/disable control | TTL-compatible input; low state disables output and reduces ICC to ≤1.5mA. |
| ISRC (Pin 16) | Sourcing limit flag | Open-collector output; pulls low when sourcing current limit is active (sinks up to 10mA). |
| ISNK (Pin 17) | Sinking limit flag | Open-collector output; pulls low when sinking current limit is active (sinks up to 10mA). |
| TSD (Pin 18) | Thermal shutdown flag | Open-collector output; pulls low when junction temperature exceeds ~160°C. |
Key Features
| Feature | Design Value |
|---|---|
| Independent source/sink current limit control | VCSRC and VCSNK accept separate 0V–5V inputs, enabling asymmetric current limiting for bidirectional TEC or motor control. |
| 2MHz current limit response bandwidth | Ensures fast reaction to overcurrent events - critical in ATE and pulse-driven loads where <5µs limit activation is required. |
| Kelvin-sense current monitoring | Separate SENSE+ and SENSE– pins eliminate IR drop errors in high-current paths, preserving regulation accuracy at ±500mA. |
| Split-supply output stage optimization | V+ and V– pins allow independent low-voltage rails for output transistors while VCC powers control circuitry - cuts quiescent dissipation by >50%. |
| Fail-safe thermal and current protection | Integrated ±800mA hard limit and 160°C thermal shutdown protect device even if external sense resistor fails open/short. |
Applications
| Automatic Test Equipment (ATE) | Laboratory Power Supplies |
|---|---|
|
Use Scenario: Precision current sourcing/sinking for semiconductor parametric testing under programmable voltage compliance. IC Role / Device Role / Timing Role: Acts as a digitally controlled, current-limited force-and-sense voltage source with real-time fault reporting via ISRC/ISNK. Use Value: Enables sub-1% current accuracy across –40°C to 85°C using external 0.1% sense resistors and VCSRC/VCSNK DAC control. |
Use Scenario: Benchtop DC power supply delivering adjustable constant-voltage or constant-current output with foldback protection. IC Role / Device Role / Timing Role: Serves as the regulated output stage amplifier with user-set current limits and thermal derating feedback. Use Value: Eliminates need for discrete current-sense op amps and comparators - simplifies design while improving response time to <5µs. |
| Motor Drivers | Thermoelectric Cooler (TEC) Drivers |
|
Use Scenario: Bidirectional H-bridge current control for small DC motors requiring soft-start and stall protection. IC Role / Device Role / Timing Role: Provides PWM-amplified current drive with independent sourcing/sinking limit thresholds and ENABLE-based braking. Use Value: Prevents motor winding damage during stall by enforcing symmetric ±500mA limits while maintaining 1.6V/µs dynamic response. |
Use Scenario: Closed-loop temperature control of TEC modules using bipolar current to heat or cool based on sensor feedback. IC Role / Device Role / Timing Role: Functions as a precision bipolar current source with matched source/sink limits and thermal fault shutdown. Use Value: Achieves <±0.5°C temperature stability using VCSRC = VCSNK tracking DAC outputs, with TSD flag triggering system-level thermal mitigation. |
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 |
|---|---|---|---|
| LT1970CFE | Same architecture and pinout, but specified only from 0°C to 70°C (commercial grade); no guaranteed performance at –40°C. | Not suitable for industrial or automotive environments requiring extended temperature operation. | Select LT1970IFE when full –40°C to 85°C operation with production-tested performance is mandatory. |
| LT3083 | Adjustable 1.5A LDO regulator (not op amp); no current-limit programming, no ISRC/ISNK flags, no ENABLE, no Kelvin sensing. | Provides fixed-current regulation only via SET pin; lacks bidirectional control, fault signaling, and precision sense architecture. | Choose LT3083 only for unidirectional, non-fault-reporting constant-current bias applications - not a functional substitute for LT1970IFE. |
Compared with LT1970CFE, the LT1970IFE guarantees full-spec performance across –40°C to 85°C with production test coverage, while LT3083 is a fundamentally different device - a regulator lacking programmable current limiting, bidirectional control, or fault-flagging capability required by LT1970IFE's target applications.
Availability
LT1970IFE 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 performance and traceable sourcing.
Supply support for LT1970IFE 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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LT1970 series.
The LT1970IFE belongs to Linear Technology's precision power op amp family, designed specifically for applications demanding programmable, high-accuracy current limiting with integrated fault reporting and thermal protection - not general-purpose amplification.
FAQ
What is the maximum supply voltage for LT1970IFE?
The LT1970IFE supports a total supply voltage (VCC to VEE) up to 36V, with absolute maximum ratings specifying VCC–VEE ≤ 36V. Operation is guaranteed from 5V to 36V. Exceeding 36V risks permanent damage per Absolute Maximum Ratings. The LT1970IFE datasheet confirms this limit applies across its full –40°C to 85°C operating range.
How does the LT1970IFE achieve independent source and sink current limiting?
The LT1970IFE uses two dedicated high-transconductance amplifiers: ISRC activates when VSENSE = (VCSRC/10), and ISNK activates when VSENSE = –(VCSNK/10). VCSRC and VCSNK are separate 0V–5V inputs referenced to COMMON, allowing asymmetric thresholds - e.g., +400mA/+–200mA - critical for TEC or motor control. This architecture is explicitly detailed in the LT1970IFE block diagram and Pin Functions section.
What is the function of the exposed pad on the LT1970IFE package?
The exposed copper pad on the LT1970IFE's 20-lead TSSOP package is electrically connected to VEE (pins 1,10,11,20) and serves as the primary thermal conduction path. It must be soldered to a VEE-referenced PCB copper pour to achieve θJA = 40°C/W. Leaving it unconnected degrades thermal performance and risks thermal shutdown under load - a requirement stated in the LT1970IFE Package Description and Typical Performance Characteristics.
Can LT1970IFE operate with single-supply configuration?
Yes, the LT1970IFE operates with single or split supplies from 5V to 36V total (VCC–VEE). In single-supply mode, VEE connects to ground, VCC to positive rail, and COMMON typically grounds. Input common-mode range extends to VEE – 0.3V, supporting ground-referenced inputs. This capability is confirmed in the LT1970IFE Absolute Maximum Ratings and Applications Information sections.
What happens to LT1970IFE output when ENABLE is pulled low?
When ENABLE is pulled below 0.8V (TTL low), the LT1970IFE enters low-power standby: output impedance rises to >1MΩ, supply current drops to ≤1.5mA (ICC(STBY)), and OUT disconnects from the internal amplifier. The device retains VCSRC/VCSNK settings and remains ready for immediate reactivation. This behavior is measured and specified in the LT1970IFE Electrical Characteristics table under IENABLE and ICC(STBY).
LT1970IFE 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:
- 800 mA
- 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
LT1970IFE FAQ
1.How can I place an order for LT1970IFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1970IFE 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 LT1970IFE reliable?
The price and inventory of LT1970IFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1970IFE is usually 5 days.
3.What payment methods are accepted for LT1970IFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1970IFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1970IFE?
LT1970IFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1970IFE 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 LT1970IFE?
For technical support, including LT1970IFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1970IFE requirements.
6.How does Aetrix verify that LT1970IFE is sourced from the original manufacturer or authorized distributors?
All LT1970IFE 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 LT1970IFE meets industry standards.
7.What is the process for return or replacement of LT1970IFE?
All LT1970IFE units undergo pre-shipment inspection (PSI). If there is an issue with LT1970IFE, 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 LT1970IFE part is unused and in its original packaging.
Return procedure for LT1970IFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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