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Analog Devices Inc. LT1970IFE#PBF
- Part No.:
- LT1970IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1970IFE#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:666
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Product details
Overview
LT1970IFE#PBF 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 LT1970IFE#PBF datasheet, LT1970IFE#PBF pinout, LT1970IFE#PBF application, or LT1970IFE#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and current-limiting behavior, and real-world design meaning for high-current analog control circuits requiring fault-aware output regulation.
Technical Context
The LT1970IFE#PBF implements a unity-gain-stable main op amp (GM1) with ±500mA output drive, paired with two independent high-transconductance current-limit amplifiers (ISRC/ISNK) that take control of the output node when VSENSE = ±VCSRC/10 or ±VCSNK/10. Its dual-supply architecture allows separation of input-stage (VCC/VEE) and output-stage (V+/V–) rails to reduce dissipation.
Current limit activation occurs within 4µs, with 2MHz bandwidth from VCSRC/VCSNK to output, while thermal shutdown triggers at ~160°C and asserts the open-collector TSD flag. The exposed-copper TSSOP-20 package base connects internally to VEE for direct thermal coupling to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±500mA minimum continuous; ±800mA fail-safe internal limit protects chip during sense-resistor faults. |
| Current Limit Accuracy | ±2% over –40°C to 85°C; enables precise programmable current sourcing/sinking 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 (min); ensures <8µs settling to 0.01% for 10V step with RL = 1kΩ, critical for fast transient load control. |
| Supply Range | 5V to 36V total (VCC–VEE); supports single-rail (e.g., 0V/36V) or split-rail (±15V) configurations with independent V+/V– biasing. |
| Operating Temperature | –40°C to +85°C (industrial grade); guaranteed performance across full range, not extrapolated. |
| Status Flags | Three open-collector outputs (ISRC, ISNK, TSD); each sinks ≥10mA and can be wire-OR'd for consolidated fault reporting. |
Pinout & Package
LT1970IFE#PBF is housed in a 20-lead plastic TSSOP package with an exposed copper bottom plate electrically tied to VEE (pins 1, 10, 11, 20, and package base) for low-thermal-resistance heat sinking. Pin 21 (exposed pad) must be soldered to a VEE-connected PCB thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VEE (1,10,11,20) | Substrate reference & negative supply | Most negative potential on board; all VEE pins connect to IC substrate - decoupling capacitor required. |
| V– (2) | Output stage negative rail | Supplies only output transistors; may be lower magnitude than VEE to drive external boost devices. |
| OUT (3) | Main amplifier force output | Kelvin-connected to load and SENSE+; carries full load current and feeds back via SENSE–. |
| SENSE+ (4) | Positive current sense input | Connected to OUT side of external RCS; voltage difference vs SENSE– sets current limit threshold. |
| FILTER (5) | Current sense filter node | Optional RC filter (1nF–100nF to SENSE–) adjusts response time; internal 1kΩ resistor sets time constant. |
| SENSE– (6) | Negative current sense input | Connected to load side of external RCS; forms differential pair with SENSE+ to monitor ILOAD. |
| VCC (7) | Input stage positive supply | Powers all circuitry except output transistors; must be ≥ V+ and ≤ VEE + 36V. |
| –IN (8) | Inverting amplifier input | High-impedance (≥500kΩ), wide common-mode range (VEE–0.3V to VEE+36V); no input current flow during limit mode. |
| +IN (9) | Noninverting amplifier input | Same CMR and impedance as –IN; feedback typically applied from SENSE– to –IN for accurate load regulation. |
| VCSNK (12) | Sink current limit control | 0V–5V input referenced to COMMON; sets sinking limit at IOUT = –VCSNK/(10·RCS) with 2MHz bandwidth. |
| VCSRC (13) | Source current limit control | 0V–5V input referenced to COMMON; sets sourcing limit at IOUT = +VCSRC/(10·RCS) with linear transfer above 0.1V. |
| COMMON (14) | Control reference node | Reference for ENABLE, VCSRC, VCSNK, and flags; may float between VEE and VCC–3V - typically grounded. |
| ENABLE (15) | Digital enable/disable input | TTL-compatible; low state disables output (high-Z) and reduces supply current to ≤1.5mA. |
| ISRC (16) | Sourcing limit flag | Open-collector; pulls low when sourcing limit is active - indicates GM1 has yielded control to ISRC amplifier. |
| ISNK (17) | Sinking limit flag | Open-collector; pulls low when sinking limit is active - signals ISNK amplifier takeover of output node. |
| TSD (18) | Thermal shutdown flag | Open-collector; pulls low at ~160°C junction temperature - requires system-level thermal management review. |
| V+ (19) | Output stage positive rail | Supplies only output transistors; may be lower magnitude than VCC to drive external boost devices. |
Key Features
| Feature | Design Value |
|---|---|
| Independent source/sink current limit control | Separate VCSRC/VCSNK inputs allow asymmetric current limiting (e.g., +300mA/–500mA) for bidirectional actuator control. |
| Fail-safe ±800mA internal current limit | Hardware-enforced clamp activates if external sense resistor opens or shorts - prevents destruction during sensor faults. |
| Thermally enhanced TSSOP-20 package | Exposed VEE-connected copper pad reduces θJA to 40°C/W with proper PCB copper area - enables >2W dissipation. |
| Fast 2MHz current limit response | Bandwidth from VCSRC/VCSNK to output ensures sub-microsecond reaction to overcurrent events in motor or TEC drivers. |
| Enable-controlled high-impedance output | ENABLE pin forces true high-Z output state with <1.5mA supply current - ideal for ATE test sequencing and power cycling. |
Applications
| Laboratory Power Supply | Thermoelectric Cooler (TEC) Driver |
|---|---|
|
Use Scenario: Programmable bench power supply delivering stable ±12V/±500mA with adjustable current limiting and overtemperature protection. IC Role / Device Role / Timing Role: Main power op amp regulating output voltage/current; ISRC/ISNK flags feed microcontroller for dynamic limit adjustment and fault logging. Use Value: Eliminates need for external current-sense amplifiers and discrete protection logic - reduces BOM count by ≥4 components. |
Use Scenario: Bidirectional driver for Peltier modules requiring precise ±2A current control with thermal foldback during heatsink failure. IC Role / Device Role / Timing Role: Precision current source/sink with independent VCSRC/VCSNK inputs setting forward/reverse TEC current; TSD flag triggers fan ramp-up. Use Value: Enables symmetric heating/cooling control with <2% current matching - improves TEC temperature stability to ±0.1°C. |
| Motor Driver (Small DC/Stepper) | Automatic Test Equipment (ATE) |
|
Use Scenario: Low-voltage (<24V) H-bridge gate driver auxiliary stage controlling 1A coil current with stall detection and thermal derating. IC Role / Device Role / Timing Role: High-current op amp driving MOSFET gates via external transistors; ISNK/ISRC flags signal stall or short-circuit conditions. Use Value: Provides real-time current limiting without sacrificing loop bandwidth - maintains 3.6MHz GBW even during fault transitions. |
Use Scenario: Pin-electronics channel in semiconductor testers requiring fast-enable, programmable current sourcing, and per-pin fault reporting. IC Role / Device Role / Timing Role: Precision current source with ENABLE pin synchronized to tester clock; wire-OR'd ISRC/ISNK/TSD flags feed FPGA for parallel fault analysis. Use Value: Reduces per-channel latency to <10µs turn-on/off - meets Class III ATE timing requirements for high-speed digital testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3083MPFE#PBF | Adjustable 1.1A LDO regulator (not op amp); no current limiting, no ISRC/ISNK flags, no V–/V+ rail separation. | Used for fixed-voltage, high-PSRR power regulation - lacks bidirectional current control and fault signaling capability. | Select only if application requires regulated voltage output without programmable current limiting or status monitoring. |
| OPA548T | Single 3A power op amp; no independent source/sink limit control; no open-collector flags; SO-20 package (θJA = 50°C/W). | Higher output current but no integrated current-limit diagnostics - requires external comparators and logic for fault reporting. | Choose when peak current >500mA is mandatory and thermal budget allows higher θJA; avoid if diagnostic visibility is required. |
Compared with LT1970IFE#PBF, LT3083MPFE#PBF provides voltage regulation without current control, while OPA548T delivers higher current but lacks the integrated dual-limit architecture and fault-flagging intelligence essential for self-monitoring power stages.
Availability
LT1970IFE#PBF is available at Aetrix Electronics and suitable for laboratory power supplies, thermoelectric cooler drivers, and automatic test equipment requiring stable component supply with industrial-grade temperature support (–40°C to +85°C).
Supply support for LT1970IFE#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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision instrumentation, industrial control, and communications systems.
The LT1970IFE#PBF belongs to Linear's precision power op amp family, engineered specifically for applications demanding programmable current limiting, fault visibility, and robust thermal management in compact TSSOP packages.
FAQ
What is the maximum continuous output current of the LT1970IFE#PBF?
The LT1970IFE#PBF delivers ±500mA continuous output current under specified conditions (TA = –40°C to +85°C, adequate heatsinking). Its internal ±800mA fail-safe limit activates only during fault conditions such as open/shorted sense resistors - it is not rated for sustained operation at that level. Designers must verify thermal margin using θJA = 40°C/W and actual PCB copper area.
How does the LT1970IFE#PBF implement independent sourcing and sinking current limits?
The LT1970IFE#PBF uses two dedicated high-transconductance amplifiers: ISRC responds to VCSRC (pin 13) to set sourcing limit at IOUT = +VCSRC/(10·RCS), while ISNK responds to VCSNK (pin 12) to set sinking limit at IOUT = –VCSNK/(10·RCS). Their offset nonlinearity below 60mV prevents simultaneous activation, ensuring stable output control.
Can the LT1970IFE#PBF operate with separate input and output supply rails?
Yes - the LT1970IFE#PBF supports independent VCC/VEE (input stage) and V+/V– (output stage) rails. This allows lowering V+/V– to reduce output-stage power dissipation while maintaining full input-stage functionality. VCC must always be ≥ V+, and V– must be ≥ VEE, per Absolute Maximum Ratings.
What is the function of the FILTER pin (pin 5) on the LT1970IFE#PBF?
The FILTER pin (pin 5) provides optional bandwidth control for the current sense amplifiers. Connecting a capacitor (1nF–100nF) between FILTER and SENSE– adds a pole to the sense path, slowing response to mitigate noise-induced false triggering. With no capacitor, the current limit bandwidth remains at 2MHz - sufficient for most motor and TEC applications.
How does thermal shutdown work on the LT1970IFE#PBF, and what happens to the output?
Thermal shutdown activates at ~160°C junction temperature, asserting the open-collector TSD flag (pin 18). Unlike many ICs, the LT1970IFE#PBF does not automatically reset upon cooling - the ENABLE pin must be cycled low-then-high to restore operation. Output remains in high-impedance state until ENABLE is reasserted, preventing uncontrolled restart.
LT1970IFE#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:
- 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#PBF FAQ
1.How can I place an order for LT1970IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1970IFE#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 LT1970IFE#PBF reliable?
The price and inventory of LT1970IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1970IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1970IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1970IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1970IFE#PBF?
LT1970IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1970IFE#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 LT1970IFE#PBF?
For technical support, including LT1970IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1970IFE#PBF requirements.
6.How does Aetrix verify that LT1970IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1970IFE#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 LT1970IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1970IFE#PBF?
All LT1970IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1970IFE#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 LT1970IFE#PBF part is unused and in its original packaging.
Return procedure for LT1970IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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