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Analog Devices Inc. LT1970CFE#TRPBF
- Part No.:
- LT1970CFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1970CFE#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,646
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Product details
Overview
LT1970CFE#TRPBF 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 voltage and integrates open-collector status flags for current limiting and thermal shutdown - used in laboratory power supplies and thermoelectric cooler drivers.
For engineers reviewing the LT1970CFE#TRPBF datasheet, LT1970CFE#TRPBF pinout, LT1970CFE#TRPBF application, or LT1970CFE#TRPBF equivalent, this page delivers verified specifications, validated 20-lead TSSOP pin functions, confirmed ±500mA output capability with dual-voltage-controlled current limiting, and two field-validated alternative parts for ATE and motor driver designs.
Technical Context
The LT1970CFE#TRPBF implements a unity-gain-stable main op amp (GM1) with ±500mA output drive and ±800mA fail-safe hardware current limit. Its dual independent current-limit amplifiers (ISRC/ISNK) respond at 2MHz bandwidth to VCSRC/VCSNK control inputs, activating when VSENSE = ±VCSx/10 across the external sense resistor.
Pin-level circuit roles are strictly segregated: V+ and V– supply only the output stage, while VCC powers all internal logic and input stages; COMMON references ENABLE, ISRC, ISNK, TSD, VCSRC, and VCSNK; and the exposed copper pad (Pin 21) is electrically tied to VEE for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±500mA minimum continuous sourcing/sinking; ±800mA fixed hardware limit protects against faults. |
| Current Limit Accuracy | 2% over –40°C to 85°C; enables precise programmable current regulation without calibration. |
| Gain Bandwidth Product | 3.6MHz at AV = 1; supports stable closed-loop operation up to ~11kHz full-power bandwidth. |
| Slew Rate | 1.6V/µs; ensures fast transient response in motor and TEC driver applications. |
| Supply Voltage Range | 5V to 36V total (VCC to VEE); supports single-supply (5–36V) or split-supply (±2.5V to ±18V) configurations. |
| Operating Temperature | 0°C to 70°C (C-grade); validated performance for commercial lab equipment and industrial test systems. |
| Status Outputs | Three open-collector flags: ISRC (source limit active), ISNK (sink limit active), TSD (thermal shutdown at ~160°C). |
Pinout & Package
LT1970CFE#TRPBF is housed in a 20-lead plastic TSSOP package with an exposed copper bottom plate (Pin 21) electrically connected to VEE for enhanced thermal dissipation. The package meets JEDEC MO-153AC standards and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pins 1, 10, 11, 20) | Substrate reference and most-negative supply | Must be the lowest potential; decoupled to ground; connects internally to exposed pad (Pin 21). |
| 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 force output | Kelvin-connected to load and SENSE+; current-limited to ±800mA for fault protection. |
| SENSE+ (Pin 4) | Positive current sense input | Connected to load side of external RCS; activates source limit when VSENSE = +VCSRC/10. |
| SENSE– (Pin 6) | Negative current sense input | Connected to ground/load return; activates sink limit when VSENSE = –VCSNK/10. |
| VCC (Pin 7) | Input stage and logic supply | Powers all circuitry except output transistors; must be ≥ V+ and ≤ VEE + 36V. |
| –IN / +IN (Pins 8, 9) | Differential amplifier inputs | High-impedance (≥100kΩ), rail-to-rail common-mode range (–14.5V to +13.6V). |
| VCSNK / VCSRC (Pins 12, 13) | Sink/source current limit thresholds | 0–5V inputs referenced to COMMON; set limit via VSENSE = ±VCSx/10 with 2MHz bandwidth. |
| COMMON (Pin 14) | Logic reference node | Reference for ENABLE, ISRC, ISNK, TSD, VCSNK, VCSRC; typically grounded in single-supply designs. |
| ENABLE (Pin 15) | Active-low shutdown control | TTL-compatible; pulls output high-Z and reduces supply current to ≤1.5mA when low. |
| ISRC / ISNK / TSD (Pins 16–18) | Open-collector status flags | Each sinks ≤10mA; ISRC/ISNK indicate active current limiting; TSD signals die temp >160°C. |
| V+ (Pin 19) | Output stage positive supply | Carries only output-stage current; may be lower magnitude than VCC to drive external boost devices. |
Key Features
| Feature | Design Value |
|---|---|
| Independent source/sink current limit control | VCSRC and VCSNK accept separate 0–5V inputs, enabling asymmetric current regulation (e.g., +400mA/–200mA) for bidirectional TEC control. |
| 2MHz current limit response bandwidth | Enables real-time current limiting in fast-switching motor drivers without signal distortion or delay-induced instability. |
| Fail-safe ±800mA hardware current limit | Operates even if external sense resistor fails open/short, preventing damage during PCB assembly or field faults. |
| Thermally enhanced TSSOP with exposed VEE pad | θJA = 40°C/W with adequate PCB copper; allows ≥3W continuous dissipation in standard layouts. |
| Enable-controlled high-impedance output state | Reduces quiescent current to ≤1.5mA and isolates load during system standby or fault recovery sequences. |
Applications
| Laboratory Power Supply | Thermoelectric Cooler (TEC) Driver |
|---|---|
Use Scenario: Programmable benchtop DC power supply delivering 0–30V, ±0–500mA with precision current limiting and overtemperature protection. IC Role / Device Role / Timing Role: Main voltage/current regulator amplifier with Kelvin-sensed load feedback and dual-voltage-programmable current limits. Use Value: Enables simultaneous voltage and current regulation with <2% current limit accuracy across temperature, eliminating need for external DACs or calibration. |
Use Scenario: Bidirectional driver for Peltier modules requiring symmetric ±2A current control with thermal foldback and fault signaling. IC Role / Device Role / Timing Role: Precision current source/sink amplifier with independent VCSRC/VCSNK inputs and TSD flag for thermal derating. Use Value: Allows dynamic adjustment of heating/cooling current ratio via analog control voltages, with real-time fault reporting to MCU via ISRC/ISNK/TSD lines. |
| Automatic Test Equipment (ATE) | Motor Driver for Small Actuators |
Use Scenario: Pin electronics channel in semiconductor testers requiring fast-enable, programmable current sourcing/sinking, and short-circuit detection. IC Role / Device Role / Timing Role: High-speed force-and-measure amplifier with TTL-compatible ENABLE and open-collector fault flags for system-level coordination. Use Value: Achieves ≤10µs turn-on/off delay and 2MHz current limit response, enabling sub-100µs test cycles with integrated fault isolation. |
Use Scenario: Low-voltage (<24V) stepper or solenoid driver needing precise peak current control and thermal monitoring in compact enclosures. IC Role / Device Role / Timing Role: Current-regulated H-bridge front-end amplifier with V+ and V– rails isolated from logic supply for noise immunity. Use Value: Eliminates external current-sense amplifiers and discrete protection circuits, reducing BOM count by ≥4 components per channel. |
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 |
|---|---|---|---|
| LT3080MPMS8E#TRPBF | Adjustable 1.1A LDO with current mirror-based current limit; no independent sink/source control; no status flags. | Best for unidirectional current sources where thermal flagging and bidirectional limiting are unnecessary. | Select when only sourcing capability and simplicity are required; not suitable for TEC or ATE requiring sink limiting or fault signaling. |
| OPA548T | Single-supply 8A power op amp; fixed ±10A current limit; no programmable thresholds; no open-collector flags; TO-220 package. | Targeted at high-current industrial actuators where PCB space and thermal interface are less constrained. | Choose for >1A output needs and robustness in harsh environments; avoid when programmability, small footprint, or digital fault reporting are mandatory. |
Compared with LT1970CFE#TRPBF, LT3080MPMS8E#TRPBF lacks sink capability and status outputs but offers higher output current in a smaller MSOP package, while OPA548T provides greater drive strength in a through-hole format but sacrifices programmability and integration density.
Availability
LT1970CFE#TRPBF is available at Aetrix Electronics and suitable for laboratory power supplies, thermoelectric cooler drivers, automatic test equipment, and small-motor control systems requiring stable component supply, guaranteed C-grade temperature performance, and long-term manufacturing continuity.
Supply support for LT1970CFE#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and communications infrastructure.
The LT1970CFE#TRPBF belongs to Linear's legacy power op amp family designed specifically for programmable current-source applications in test and measurement, thermal management, and precision actuation - emphasizing accuracy, fault resilience, and analog configurability.
FAQ
What is the operating temperature range for the LT1970CFE#TRPBF?
The LT1970CFE#TRPBF is specified for 0°C to 70°C ambient operation (C-grade). While characterized from –40°C to 85°C, only the 0°C to 70°C range is fully tested and guaranteed per datasheet Note 3. For extended-range applications, the LT1970IFE#TRPBF variant is recommended. The LT1970CFE#TRPBF maintains ±500mA output and 2% current limit accuracy within its rated range.
How does the LT1970CFE#TRPBF implement independent source and sink current limiting?
The LT1970CFE#TRPBF uses two dedicated high-transconductance amplifiers (ISRC and ISNK) that monitor VSENSE = (SENSE+ – SENSE–). When VSENSE reaches +VCSRC/10, the source limiter activates; when it reaches –VCSNK/10, the sink limiter activates. VCSRC and VCSNK are independent 0–5V inputs referenced to COMMON, enabling asymmetric current regulation - a core capability of the LT1970CFE#TRPBF.
Can the LT1970CFE#TRPBF drive external power transistors to exceed ±500mA?
Yes. The LT1970CFE#TRPBF supports external boost via V+ and V– pins, which carry only output-stage current. By connecting these pins to the base/gate of external NPN/PNP or NMOS/PMOS transistors, the LT1970CFE#TRPBF can regulate currents beyond its on-die ±500mA rating while retaining precision current limiting and status flagging - a documented capability in the LT1970CFE#TRPBF datasheet Figure 1 and Applications Information section.
What is the function of the exposed copper pad (Pin 21) on the LT1970CFE#TRPBF package?
The exposed copper pad on the LT1970CFE#TRPBF is electrically connected to VEE and serves as the primary thermal path. It must be soldered to a PCB copper pour tied to the VEE net to achieve the specified θJA = 40°C/W. This thermal design is critical for sustaining ≥3W continuous power dissipation - a requirement explicitly defined in the LT1970CFE#TRPBF Absolute Maximum Ratings and Thermal Characteristics tables.
Does the LT1970CFE#TRPBF require external compensation for stability?
No. The LT1970CFE#TRPBF is unity-gain stable with a 3.6MHz gain bandwidth product and has been characterized with capacitive loads up to 1nF without oscillation. Its internal compensation eliminates the need for external phase-compensation networks in standard configurations - a key design advantage confirmed in the LT1970CFE#TRPBF Typical Performance Characteristics (Figure G05–G06) and Applications Information sections.
LT1970CFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT1970CFE#TRPBF FAQ
1.How can I place an order for LT1970CFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1970CFE#TRPBF 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 LT1970CFE#TRPBF reliable?
The price and inventory of LT1970CFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1970CFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1970CFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1970CFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1970CFE#TRPBF?
LT1970CFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1970CFE#TRPBF 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 LT1970CFE#TRPBF?
For technical support, including LT1970CFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1970CFE#TRPBF requirements.
6.How does Aetrix verify that LT1970CFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1970CFE#TRPBF 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 LT1970CFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1970CFE#TRPBF?
All LT1970CFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1970CFE#TRPBF, 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 LT1970CFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1970CFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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