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Analog Devices Inc. LT1970ACFE#PBF
- Part No.:
- LT1970ACFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1970ACFE#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,377
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Product details
Overview
LT1970ACFE#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 LT1970ACFE#PBF datasheet, LT1970ACFE#PBF pinout, LT1970ACFE#PBF application, or LT1970ACFE#PBF equivalent, this page delivers verified specifications, thermal shutdown and open-collector status flags, enable-controlled high-impedance output state, and TSSOP-20 package–specific layout guidance for stable high-current analog control designs.
Technical Context
The LT1970ACFE#PBF integrates a unity-gain-stable main op amp (GM1) with ±500mA output capability and two independent high-transconductance current-limit amplifiers (ISRC/ISNK), each with user-programmable thresholds via VCSRC/VCSNK pins. Its architecture decouples signal path and current-limit control using diode-isolated nodes, enabling seamless handoff within ~4µs when VSENSE exceeds VCSRC/10 or –VCSNK/10.
It supports split or single supply operation with separate V+, V– rails for output-stage power optimization, and includes fail-safe ±800mA fixed current limit and thermal shutdown at ~160°C. The exposed-pad TSSOP-20 package ties Pin 21 to VEE for direct PCB heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±500mA continuous; enables direct drive of motors, TECs, and lab PSU loads without external boost transistors. |
| Current Limit Accuracy | 1% over temperature; ensures precise, repeatable current regulation in automated test equipment and closed-loop thermal control. |
| Gain-Bandwidth Product | 3.6MHz; supports stable feedback design for bandwidth-critical applications like fast TEC temperature settling. |
| Slew Rate | 1.6V/µs; enables ≤8µs 0.01% settling for 10V step outputs, critical for transient-responsive power conditioning. |
| Operating Temp Range | 0°C to 70°C (LT1970AC grade); validated for commercial industrial environments with no derating required up to 70°C ambient. |
| Supply Voltage Range | 5V to 36V total (VCC to VEE); accommodates wide-input DC-DC outputs and legacy ±15V systems. |
| Input Offset Voltage | 200µV typical (0°C to 70°C); minimizes DC error in precision current-source configurations. |
Pinout & Package
LT1970ACFE#PBF is housed in a 20-lead plastic TSSOP package with an exposed copper thermal pad (Pin 21) electrically connected to VEE. The package features low thermal resistance (θJA = 40°C/W with adequate PCB copper) and is lead-free (Pb-free) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (Pins 1, 10, 11, 20, 21) | Substrate reference & negative supply rail | Must be most negative potential; exposed pad (Pin 21) must be soldered to VEE-connected PCB copper for thermal management. |
| V– (Pin 2) | Output stage negative supply | Carries only output-stage current; can be set lower than VEE to reduce power dissipation or drive external boost transistors. |
| OUT (Pin 3) | Main amplifier output | Force node in Kelvin-sensed load configuration; internally current-limited to ±800mA for fault protection. |
| SENSE+ (Pin 4) | Positive current sense input | Connected to load side of external sense resistor; sourcing limit activates when VSENSE = VSENSE+ – VSENSE– ≥ VVCSRC/10. |
| FILTER (Pin 5) | Current sense filter node | Optional RC filter (1kΩ internal + external C) to adjust response time; typically left open or shorted to SENSE–. |
| SENSE– (Pin 6) | Negative current sense input | Connected to ground/load return; sinking limit activates when VSENSE ≤ –VVCSNK/10. |
| VCC (Pin 7) | Main circuitry positive supply | Powers input stage, bias, logic; must be ≥ V+ and ≤ VEE + 36V; requires local low-ESR decoupling. |
| –IN (Pin 8) | Inverting input | High-impedance input (6 pF, 500 kΩ common-mode RIN); accepts VCM from VEE – 0.3V to VEE + 36V. |
| +IN (Pin 9) | Noninverting input | Identical CM range and impedance as –IN; maintains high-Z during current-limit mode to prevent latch-up. |
| VCSNK (Pin 12) | Sink current limit control | 0V–6V input referenced to COMMON; sets sinking threshold at –VVCSNK/10 with <4mV minimum clamp. |
| VCSRC (Pin 13) | Source current limit control | 0V–6V input referenced to COMMON; sets sourcing threshold at +VVCSRC/10 with <4mV minimum clamp. |
| COMMON (Pin 14) | Logic reference node | Reference for ENABLE, ISRC, ISNK, TSD, VCSRC, VCSNK; may float between VEE and VCC – 3V (typically grounded). |
| ENABLE (Pin 15) | Digital enable/disable control | TTL-compatible input; low state disables output (high-Z) and reduces supply current to ≤1.5mA. |
| ISRC (Pin 16) | Sourcing current limit flag | Open-collector output; pulls low when sourcing limit is active; sinks up to 10mA; OR-able with ISNK/TSD. |
| ISNK (Pin 17) | Sinking current limit flag | Open-collector output; pulls low when sinking limit is active; sinks up to 10mA; OR-able with ISRC/TSD. |
| TSD (Pin 18) | Thermal shutdown flag | Open-collector output; pulls low at ~160°C junction temp; signals need to review thermal design or load conditions. |
| V+ (Pin 19) | Output stage positive supply | Carries only output-stage current; can 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 pins allow asymmetric current limiting (e.g., +400mA/–600mA) for bidirectional motor control or TEC biasing. |
| 1% current limit accuracy over temperature | Enables traceable calibration in ATE systems without per-unit trimming; eliminates need for external DAC-based limit adjustment. |
| Reactive load stability enhancement | Internal compensation supports direct capacitive (up to 1nF) and inductive load driving without external snubbers or isolation resistors. |
| Fail-safe ±800mA fixed output limit | Hardware-enforced backup limit activates if external sense resistor opens or shorts, preventing catastrophic device failure. |
| Enable-controlled high-impedance output state | ENABLE pin reduces quiescent current to ≤1.5mA and forces zero output current-ideal for power sequencing in multi-rail systems. |
Applications
| Laboratory Power Supply | Thermoelectric Cooler Driver |
|---|---|
|
Use Scenario: Programmable bench power supply delivering 0–±15V at up to ±500mA with precise current limiting and remote sensing. IC Role / Device Role / Timing Role: Main voltage/current regulator amplifier with Kelvin-sensed load feedback and independent sourcing/sinking limit control. Use Value: Eliminates need for discrete current-sense op amps and external limit comparators-reducing BOM count by ≥4 components while improving limit repeatability to ±1%. |
Use Scenario: Bidirectional driver for Peltier modules requiring symmetric ±2A current control with thermal foldback. IC Role / Device Role / Timing Role: Precision bipolar current source/sink with real-time thermal monitoring via TSD flag and programmable current limits. Use Value: Enables sub-°C temperature stability via closed-loop current control; TSD flag triggers system-level thermal throttling before module damage occurs. |
| Automatic Test Equipment | Motor Driver (Small DC) |
|
Use Scenario: Channelized current source in semiconductor parametric testers, delivering calibrated ±500mA pulses with <4µs limit activation. IC Role / Device Role / Timing Role: High-speed, digitally enabled current stimulus generator with open-collector ISRC/ISNK flags for pass/fail logging. Use Value: Reduces test cycle time by eliminating software-based current monitoring; hardware flags provide deterministic timing for synchronized data capture. |
Use Scenario: H-bridge pre-driver for small DC motors (e.g., robotics actuators), where bidirectional current control replaces dual MOSFET gate drivers. IC Role / Device Role / Timing Role: Integrated current-regulated half-bridge output stage with ENABLE-based direction control and thermal fault signaling. Use Value: Simplifies motor control PCB layout by integrating current sensing, limiting, and thermal protection-cutting component count by ≥6 vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1970AIFE#PBF | Wider operating temperature range (–40°C to 85°C); identical electrical specs and pinout. | Required for extended-temperature industrial or automotive under-hood applications; not rated for 0°C–70°C commercial use only. | Select LT1970AIFE#PBF when ambient operating temperature exceeds 70°C or cold-start below 0°C is required. |
| LT3083EDD#PBF | Adjustable 1.5A LDO regulator (not op amp); no current-limit programming, no ISRC/ISNK flags, no ENABLE pin. | Used for fixed-voltage, high-current linear regulation-not for precision current sourcing/sinking or dynamic limit control. | Choose LT3083EDD#PBF only for simple high-current voltage regulation; it lacks all current-limit control and status signaling of LT1970ACFE#PBF. |
Compared with LT1970AIFE#PBF, the LT1970ACFE#PBF trades extended temperature coverage for cost and qualification in commercial-grade systems; compared with LT3083EDD#PBF, it provides full programmable current-limit architecture and real-time status flags essential for closed-loop current control.
Availability
LT1970ACFE#PBF is available at Aetrix Electronics and suitable for laboratory power supplies, thermoelectric cooler drivers, automatic test equipment, and small DC motor control requiring stable component supply across commercial temperature ranges.
Supply support for LT1970ACFE#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 digital signal processing semiconductors.
The LT1970A series belongs to Linear Technology's precision power op amp product line, designed specifically for applications demanding accurate, programmable current limiting with integrated status signaling and robust thermal protection.
FAQ
What is the maximum continuous output current of the LT1970ACFE#PBF?
The LT1970ACFE#PBF delivers ±500mA continuous output current under specified conditions (0°C to 70°C, adequate heatsinking). Its internal ±800mA fail-safe limit protects against faults, but sustained operation above ±500mA requires external power transistors and careful thermal design. The LT1970ACFE#PBF datasheet specifies this rating with 3.6MHz GBW and 1.6V/µs slew rate maintained.
How does the LT1970ACFE#PBF implement independent sourcing and sinking current limits?
The LT1970ACFE#PBF uses two dedicated high-transconductance amplifiers: ISRC responds to VCSRC (Pin 13) to set sourcing limit at VSENSE = VCSRC/10, while ISNK responds to VCSNK (Pin 12) to set sinking limit at VSENSE = –VCSNK/10. These thresholds are independent, enabling asymmetric current control-critical for applications like TEC drivers where heating/cooling currents differ. The LT1970ACFE#PBF guarantees 1% accuracy across temperature.
Can the LT1970ACFE#PBF drive capacitive loads directly?
Yes, the LT1970ACFE#PBF is designed for improved reactive load driving stability and can drive capacitive loads up to 1nF directly without external compensation. Its internal compensation and 3.6MHz gain-bandwidth product maintain phase margin >42° across supply voltages (±5V to ±18V), as verified in the LT1970ACFE#PBF Typical Performance Characteristics (Figure G10/G11). This eliminates need for series isolation resistors in many sensor or actuator interfaces.
What is the function of the exposed thermal pad (Pin 21) on the LT1970ACFE#PBF?
The exposed pad on the LT1970ACFE#PBF (Pin 21) is electrically connected to VEE and serves as the primary thermal conduction path. It must be soldered to a PCB copper area tied to the VEE net to achieve θJA = 40°C/W. Failure to connect this pad degrades thermal performance significantly-potentially triggering thermal shutdown at ≤1W dissipation. The LT1970ACFE#PBF datasheet explicitly requires this connection for rated operation.
Does the LT1970ACFE#PBF support single-supply operation?
Yes, the LT1970ACFE#PBF operates from single or split supplies with total VCC-to-VEE voltage between 5V and 36V. For single-supply use, VEE is typically grounded, VCC is the positive rail, and V+, V– are tied to VCC and VEE respectively-or independently biased for efficiency. Input common-mode range extends to VEE – 0.3V, allowing ground-referenced inputs. All key specs-including ±500mA output and 1% current limit accuracy-are guaranteed in single-supply configurations per the LT1970ACFE#PBF datasheet.
LT1970ACFE#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
LT1970ACFE#PBF FAQ
1.How can I place an order for LT1970ACFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1970ACFE#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 LT1970ACFE#PBF reliable?
The price and inventory of LT1970ACFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1970ACFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1970ACFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1970ACFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1970ACFE#PBF?
LT1970ACFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1970ACFE#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 LT1970ACFE#PBF?
For technical support, including LT1970ACFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1970ACFE#PBF requirements.
6.How does Aetrix verify that LT1970ACFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1970ACFE#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 LT1970ACFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1970ACFE#PBF?
All LT1970ACFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1970ACFE#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 LT1970ACFE#PBF part is unused and in its original packaging.
Return procedure for LT1970ACFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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