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Analog Devices Inc. LT1970CFE#PBF
- Part No.:
- LT1970CFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1970CFE#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,504
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Product details
Overview
LT1970CFE#PBF from Analog Devices (formerly Linear Technology) is a ±500mA high-current 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 supplies, and integrates open-collector fault flags (ISRC, ISNK, TSD) and TTL-compatible enable control - used in laboratory power supplies and thermoelectric cooler drivers.
For engineers reviewing the LT1970CFE#PBF datasheet, LT1970CFE#PBF pinout, LT1970CFE#PBF application, or LT1970CFE#PBF equivalent, key selection considerations include its dual independent current limit control (VCSRC/VCSNK), Kelvin-sensed load interface, thermal shutdown flag, 20-lead TSSOP package with exposed VEE pad, and ±800mA fail-safe output current limit.
Technical Context
The LT1970CFE#PBF 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, externally programmable current limiting with 2MHz bandwidth from control input to output response. Its architecture separates input stage (VCC/VEE) and output stage (V+/V–) supplies to reduce dissipation.
Pin-level functionality includes Kelvin-connected SENSE+/SENSE– for accurate load current monitoring, FILTER pin for optional 1nF–100nF sense filtering, and three open-collector status outputs (ISRC, ISNK, TSD) referenced to COMMON - all supporting fault-aware system design without external logic. The ENABLE pin provides TTL-level shutdown with <1.5mA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±500mA continuous; ±800mA fixed fail-safe limit protects chip during sense resistor faults. |
| Current Limit Accuracy | ±2% over –40°C to 85°C; enables precision current sourcing/sinking in ATE and motor control. |
| Gain Bandwidth Product | 3.6MHz; supports stable closed-loop operation up to AV = 100 with adequate phase margin. |
| Slew Rate | 1.6V/µs; ensures fast transient response in dynamic load applications like TEC drivers. |
| Supply Voltage Range | 5V to 36V total (VCC to VEE); allows flexible single-rail (e.g., +15V/0V) or split-rail (±15V) operation. |
| Current Limit Bandwidth | 2MHz; enables rapid response to overcurrent events without compromising signal integrity. |
| Operating Temperature | 0°C to 70°C (C-grade); validated performance across commercial temperature range. |
Pinout & Package
LT1970CFE#PBF is housed in a 20-lead plastic TSSOP package with an exposed copper bottom plate electrically connected to VEE (pins 1, 10, 11, 20, and package base) for enhanced thermal dissipation. The package requires soldering the exposed pad to a VEE-referenced PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (1,10,11,20) | Substrate reference / most negative supply | Must be most negative voltage; decoupled to ground; unused pins left open. |
| V– (2) | Output stage negative supply | Drives external boost transistors; carries only output-stage current, not bias current. |
| OUT (3) | Main amplifier output / force node | Kelvin-connected to SENSE+ and load; delivers ±500mA; internally limited to ±800mA. |
| SENSE+ (4) | Positive current sense input | Connected to OUT/load side of sense resistor; triggers sourcing limit at VSENSE = VCSRC/10. |
| FILTER (5) | Current sense filter node | Optional RC filter (1kΩ internal + 1–100nF cap) to adjust limit response time. |
| SENSE– (6) | Negative current sense input | Connected to load/ground side of sense resistor; triggers sinking limit at VSENSE = –VCSNK/10. |
| VCC (7) | Main circuitry positive supply | Powers input stage, bias, logic; must be ≥ V+; decoupled with low-ESR capacitor. |
| –IN (8) | Inverting amplifier input | High-impedance, rail-to-rail common-mode range (VEE – 0.3V to VEE + 36V). |
| +IN (9) | Noninverting amplifier input | Same CMR as –IN; remains high-Z during current limit activation to prevent latch-up. |
| VCSNK (12) | Sink current limit control voltage | 0–5V vs COMMON sets sinking limit threshold; linear transfer above 60mV. |
| VCSRC (13) | Source current limit control voltage | 0–5V vs COMMON sets sourcing limit threshold; independent adjustment from VCSNK. |
| COMMON (14) | Logic reference / flag return | Reference for ENABLE, ISRC, ISNK, TSD; typically grounded; range: VEE to VCC – 3V. |
| ENABLE (15) | TTL-level shutdown input | Pull ≤0.8V to disable output and reduce supply current to <1.5mA. |
| ISRC (16) | Sourcing limit flag (open-collector) | Pulls low when sourcing limit active; sinks up to 10mA; OR-able with ISNK/TSD. |
| ISNK (17) | Sinking limit flag (open-collector) | Pulls low when sinking limit active; same sink capability and OR capability as ISRC. |
| TSD (18) | Thermal shutdown flag (open-collector) | Pulls low at ~160°C junction temp; signals need to review thermal design or loading. |
| V+ (19) | Output stage positive supply | Drives external boost devices; carries only output-stage current; decouple if unused. |
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 - critical for bidirectional motor or TEC control. |
| Kelvin-connected current sensing | Separate SENSE+ and SENSE– pins eliminate IR drop errors in high-current paths, enabling accurate ±500mA regulation. |
| Fail-safe thermal and current protection | Integrated ±800mA hard current limit and 160°C thermal shutdown protect device even if external sense resistor fails open/short. |
| Three open-collector status flags | ISRC, ISNK, and TSD provide real-time fault visibility without external pull-ups - simplifies system-level diagnostics and safety interlocks. |
| Split-supply output stage optimization | V+ and V– pins allow independent lower-voltage rails for output transistors, reducing power dissipation while maintaining full VCC-biased input stage performance. |
Applications
| Automatic Test Equipment | Laboratory Power Supplies |
|---|---|
|
Use Scenario: Precision current sourcing/sinking for device characterization under programmable load conditions. IC Role / Device Role / Timing Role: Acts as programmable current source/sink with real-time limit monitoring and fault reporting via ISRC/ISNK/TSD. Use Value: Enables automated pass/fail testing with sub-2% current limit accuracy and immediate overcurrent/thermal fault detection. |
Use Scenario: Bench power supply delivering stable, adjustable voltage and current-limited output for prototyping. IC Role / Device Role / Timing Role: Serves as the regulated output stage with independent CV/CC modes controlled by VCSRC/VCSNK and ENABLE. Use Value: Delivers ±500mA at up to 36V with seamless transition between voltage and current regulation, plus visual/LED fault indication. |
| Motor Drivers | Thermoelectric Cooler Driver |
|
Use Scenario: Bidirectional H-bridge driver for small DC motors requiring precise torque control and stall protection. IC Role / Device Role / Timing Role: Functions as dual-quadrant current amplifier with independent sourcing/sinking limits and fast 2MHz limit response. Use Value: Prevents motor winding damage during stall by enforcing tight current bounds while maintaining smooth commutation. |
Use Scenario: Closed-loop temperature controller driving Peltier elements with symmetric heating/cooling capability. IC Role / Device Role / Timing Role: Provides bipolar current output (±500mA) with matched sourcing/sinking limits and thermal fault signaling. Use Value: Ensures precise TEC current control with automatic shutdown on overheating - critical for instrument-grade thermal stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current op amp with programmable current limit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3083MPFE#PBF | Adjustable 1.1A LDO regulator with current limit monitor; no op amp functionality or Kelvin sensing. | Used for regulated current sources where voltage gain, feedback topology, or fast transient response are not required. | Select LT3083MPFE#PBF only for simple constant-current biasing; not suitable for servo loops or precision current-mode amplification. |
| OPA548T | Single 3A power op amp with fixed ±3A current limit; no independent source/sink control or open-collector flags. | Applicable in high-current unidirectional applications where fault visibility and asymmetric current limiting are unnecessary. | Choose OPA548T for higher output current (3A) but accept loss of diagnostic flags, dual-limit flexibility, and Kelvin sensing. |
Compared with LT1970CFE#PBF, LT3083MPFE#PBF lacks op amp gain structure and real-time fault flags, while OPA548T offers higher current but no independent sourcing/sinking thresholds or integrated thermal flag - making LT1970CFE#PBF uniquely suited for bidirectional, fault-aware current regulation.
Availability
LT1970CFE#PBF is available at Aetrix Electronics and suitable for laboratory power supplies, automatic test equipment, motor drivers, and thermoelectric cooler drivers requiring stable component supply, guaranteed C-grade temperature performance (0°C to 70°C), and long-term industrial availability.
Supply support for LT1970CFE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and instrumentation markets.
The LT1970CFE#PBF belongs to Linear's legacy power op amp family, designed specifically for applications demanding precision programmable current limiting, robust fault handling, and Kelvin-sensed load interfaces - targeting test, measurement, and precision actuation systems.
FAQ
What is the operating temperature range for LT1970CFE#PBF?
The LT1970CFE#PBF is specified for 0°C to 70°C (commercial grade). While characterized and expected to function from –40°C to 85°C, only the 0°C to 70°C range is fully tested and guaranteed per datasheet specifications. For extended temperature operation, the LT1970IFE#PBF variant is recommended. The LT1970CFE#PBF maintains ±2% current limit accuracy and 3.6MHz GBW within its rated range.
How does the LT1970CFE#PBF implement independent sourcing and sinking current limits?
The LT1970CFE#PBF uses two dedicated control inputs - VCSRC (Pin 13) for sourcing limit and VCSNK (Pin 12) - each accepting 0–5V referenced to COMMON. The internal current sense amplifiers trigger when VSENSE = (VCSRC/10) for sourcing or VSENSE = (–VCSNK/10) for sinking. This enables asymmetric current bounding, such as +400mA/–600mA, essential for TEC and motor control. The LT1970CFE#PBF guarantees ±2% accuracy across temperature.
Can LT1970CFE#PBF drive external power transistors to exceed ±500mA?
Yes. The LT1970CFE#PBF supports output current boosting via its V+ and V– pins, which can drive the bases/gates of external NPN/PNP or NMOS/PMOS transistors. When configured this way, the on-chip output stage acts as a driver for external devices, extending current capability beyond ±500mA while retaining precision current limit control through the SENSE+/SENSE– interface. The LT1970CFE#PBF's fail-safe ±800mA internal limit remains active during boost operation.
What is the purpose of the FILTER pin (Pin 5) on LT1970CFE#PBF?
The FILTER pin (Pin 5) connects to an internal 1kΩ resistor and allows addition of an external capacitor (1nF–100nF) between FILTER and SENSE– to form a low-pass filter on the current sense path. This adjusts the response time of the current limit amplifiers - useful to suppress noise-induced false triggering while preserving 2MHz bandwidth when left open or shorted. The LT1970CFE#PBF's typical current limit response remains 4µs even with filtering applied.
Does LT1970CFE#PBF require decoupling capacitors, and where should they be placed?
Yes. LT1970CFE#PBF requires low-ESR ceramic capacitors: one from VCC to ground (near Pin 7), one from VEE to ground (near any VEE pin), and separate capacitors from V+ to ground and V– to ground if those pins are used for output stage supplies. The exposed copper pad (VEE) must also be soldered to a large VEE-referenced PCB copper area for thermal management. These decoupling practices ensure stable operation and prevent oscillation, especially under high-current transients.
LT1970CFE#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT1970CFE#PBF FAQ
1.How can I place an order for LT1970CFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1970CFE#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 LT1970CFE#PBF reliable?
The price and inventory of LT1970CFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1970CFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1970CFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1970CFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1970CFE#PBF?
LT1970CFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1970CFE#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 LT1970CFE#PBF?
For technical support, including LT1970CFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1970CFE#PBF requirements.
6.How does Aetrix verify that LT1970CFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1970CFE#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 LT1970CFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1970CFE#PBF?
All LT1970CFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1970CFE#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 LT1970CFE#PBF part is unused and in its original packaging.
Return procedure for LT1970CFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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