LT1970IFE - ±500mA Power Op Amp | Analog Devices
N.º de pieza: LT1970IFE ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.32 | $8,32 |
| 10 | $7.65 | $76,50 |
| 100 | $6.85 | $685,00 |
| 500 | $6.2 | $3.100,00 |
| 1.000 | $5.55 | $5.550,00 |
LT1970IFE Descripción general
A power op amp is a specialized operational amplifier designed to deliver output power levels orders of magnitude greater than a conventional op amp. Unlike a small-signal op amp that typically sources or sinks tens of milliamps, a power op amp integrates output stages capable of hundreds of milliamps to several amps, often with thermal protection, current limiting, and short-circuit handling. Power op amps sit hierarchically between op amps and power management ICs, frequently replacing discrete driver + MOSFET combinations in programmable current sources, motor drivers, and audio line drivers. The LT1970 specifically combines power-output stages with adjustable precision current limiting, making it a single-chip alternative to discrete driver designs.
Key features include ±500 mA minimum output current, 2 % accurate independent source and sink current-limit programming via external control voltages, the ability to boost output current by adding external power transistors, single or split supply operation from 5 V to 36 V, and thermal shutdown with the exposed pad for low thermal resistance. The output stage swings to within ±2.5 V of either supply rail at full current.
The architecture uses a precision input stage followed by a high-current output stage with separate current-sense paths. The sourcing and sinking current limits are independently programmed by two DC control voltages on the ILIM+ and ILIM- pins, allowing asymmetric profiles for charging supercapacitors or driving inductive loads. External boost transistors can multiply output current beyond 500 mA while preserving the precision current-limit function.
Typical applications include programmable current sources for LED drivers, solenoid and actuator drivers, motor torque drivers, headphone amplifiers, programmable power supplies, and battery chargers. The wide supply range makes the LT1970 particularly suited to industrial 24 V bus systems and automotive 12 V/24 V loads.
When designing with this device, place a 1 µF bypass capacitor close to each supply pin and use the exposed pad for thermal dissipation. For applications above 500 mA, ensure the external boost transistors are mounted on a thermally adequate footprint and that the current-limit control voltages remain stable across the operating temperature range.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the LT1970IFE that complement the official datasheet by adding cross-source comparisons and PCB-level guidance.
Alternativas directas para LT1970IFE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LT1970IFE (mismo factor de forma y huella) — difiere en Lead-Free / RoHS, Package.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LT1970IFE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT1970AIFE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT1970CFE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT1970HFE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT1970IFE Valores máximos y características eléctricas
| Product Type | Power Operational Amplifier |
| Output Current | ±500 mA minimum |
| Number of Channels | 1 |
| Supply Voltage (Total) | 5 V to 36 V |
| Supply Type | Single or Split |
| Current Limit Accuracy | 2 % (typical) |
| Current Limit Programming | Separate ILIM+ and ILIM- control voltages |
| Output Swing | Within ±2.5 V of either supply rail at full load |
| External Current Boost | Supported via external power transistors |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C (I grade) |
| Encapsulado | 20-pin TSSOP-EP (Exposed Pad) |
| Tipo de montaje | Surface Mount |
| Apagado térmico | Yes |
| Lead-Free / RoHS | Lead-free (PBF suffix); RoHS-compliant variants available |
| Datasheet Document | 1970fe.pdf (per Analog Devices product page) |
Configuración de pines de LT1970IFE
| Pin 1 | NC — No connection (per datasheet) |
| Pin 2 | NC — No connection (per datasheet) |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | IN- — Inverting input |
| Pin 5 | VREF — Reference voltage for current-limit programming |
| Pin 6 | ILIM+ — Source current-limit control voltage |
| Pin 7 | ILIM- — Sink current-limit control voltage |
| Pin 8 | V- — Negative supply |
| Pin 9 | V- — Negative supply |
| Pin 10 | NC — No connection (per datasheet) |
| Pin 11 | NC — No connection (per datasheet) |
| Pin 12 | OUT — Power output |
| Pin 13 | V+ — Positive supply |
| Pin 14 | V+ — Positive supply |
| Pin 15 | NC — No connection (per datasheet) |
| Pin 16 | NC — No connection (per datasheet) |
| Pin 17 | NC — No connection (per datasheet) |
| Pin 18 | NC — No connection (per datasheet) |
| Pin 19 | NC — No connection (per datasheet) |
| Pin 20 | NC — No connection (per datasheet) |
| Pin EP | Exposed Pad — Thermal pad, solder to PCB ground plane |
Aplicaciones típicas
LT1970IFE es adecuado para 7 aplicacións: Programmable Current Source / Sink, Solenoid and Actuator Driver, Headphone / Line Driver Amplifier, Battery Charger Current Controller, DC Motor Torque / Voice-Coil Driver, Programmable Power Supply Output Stage, LED Driver with Thermal Foldback.
Programmable Current Source / Sink
The LT1970IFE's independently programmable sourcing and sinking current limits (set by DC voltages on ILIM+ and ILIM- with 2 % accuracy) make it ideal for precision current-source applications such as battery formation, supercapacitor test, and LED string drivers. It replaces discrete op amp + MOSFET + sense resistor designs with a single 20-pin TSSOP-EP chip. Output current up to ±500 mA is available without external boost transistors; the part handles both charge and discharge profiles independently, supporting asymmetric profiles required by battery-conditioning and active-cell-balancing systems.
Recomendado
Solenoid and Actuator Driver
With ±500 mA output swing and 5 V to 36 V supply operation, the LT1970IFE drives proportional solenoids, valves, and small DC actuators directly in industrial-control loops. Its adjustable current-limit feature protects the actuator coil from overcurrent faults, while the exposed thermal pad dissipates the loss in the same IC - eliminating the need for a separate current-limit circuit. The independent source/sink limits allow controlled flyback-energy recirculation into the actuator, useful for proportional-valve and haptic-feedback applications.
Recomendado
Headphone / Line Driver Amplifier
The LT1970IFE is widely used as a headphone amplifier driver because its ±500 mA output current swings low-impedance (32 ohm to 600 ohm) headphones to full output without additional buffer stages. The 5 V to 36 V single-supply operation suits portable and line-level audio designs. Its exposed thermal pad maintains junction temperature under continuous sine-wave drive, and the precision current-limit prevents damage from accidental output shorts - a common failure mode in consumer audio products.
Recomendado
Battery Charger Current Controller
In lithium-ion and lead-acid battery chargers, the LT1970IFE regulates charge and discharge currents by monitoring current-sense voltages on its ILIM+ and ILIM- pins with 2 % accuracy. The independent source/sink control allows the charger to switch smoothly between CC and CV modes, while the 5 V to 36 V supply matches 1S to 8S battery packs. The exposed pad dissipates the difference between input and battery voltage times charge current, simplifying thermal design for wall-plug chargers and solar MPPT regulators.
Recomendado
DC Motor Torque / Voice-Coil Driver
The LT1970IFE delivers bidirectional current to small DC motors, voice coils, and voice-coil actuators in hard-disk drives, optical image-stabilization systems, and haptic-feedback modules. Its split-supply operation allows direct drive of H-bridge-like single-ended loads with controlled acceleration and deceleration profiles via the ILIM inputs. The ±500 mA continuous output drives voice coils rated up to several watts, and the exposed pad keeps the die cool during PWM-like transitions.
Recomendado
Programmable Power Supply Output Stage
Used as the series-pass element in a programmable lab power supply, the LT1970IFE handles ±500 mA continuously and can be paralleled with external boost transistors for higher-current rails. The ILIM+ pin sets the constant-current threshold, while the ILIM- pin sets the constant-current sink limit for two-quadrant operation - useful for testing battery-powered DUTs. The 5 V to 36 V compliance matches most lab-bench applications without an additional pre-regulator.
Recomendado
LED Driver with Thermal Foldback
The LT1970IFE drives high-brightness LED strings up to ±500 mA with adjustable current-limit thresholds via ILIM+ - ideal for architectural lighting, automotive LED modules, and industrial machine-vision illumination. The exposed pad maintains thermal performance at high currents, and the 5 V to 36 V supply accommodates both 12 V and 24 V bus systems. Programming the source limit with a temperature-dependent voltage (from an NTC + resistor divider) enables automatic thermal foldback without firmware intervention.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LT1970IFE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LT1970IFE#PBF | LT1970AIFE#PBF | LT1970CFE#PBF | LT1970HFE |
|---|---|---|---|---|---|
| Brand | Analog Devices (formerly Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-pin TSSOP-EP | 20-pin TSSOP-EP - same | 20-pin TSSOP-EP - same | 20-pin TSSOP-EP - same | 20-pin TSSOP-EP - same |
| Output Current | ±500 mA | ±500 mA | ±500 mA | ±500 mA | ±500 mA |
| Supply Voltage | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (extended) | 0 °C to +70 °C | -40 °C to +125 °C (military) |
| Lead-Free / RoHS | Verify per suffix | Yes (lead-free) | Yes (lead-free) | Yes (lead-free) | Verify per suffix |
| Current-Limit Accuracy | 2 % (typical) | 2 % | 2 % (tighter grade) | 2 % | 2 % |
| Datasheet Document | 1970fe.pdf | 1970fe.pdf (same) | 1970fe.pdf (same) | 1970fe.pdf (same) | 1970fe.pdf (same) |
Diferenciadores clave
- Programmable bidirectional current limit without external sense resistor (frente a LT1970IFE#PBF)
- External boost transistors multiply output beyond 500 mA (frente a Discrete op amp + MOSFET designs)
- Wide supply range with single or split operation (frente a LT1970CFE#PBF)
Notas de diseño
The LT1970IFE's TSSOP-EP package relies on the exposed pad for thermal dissipation. Solder the EP directly to a PCB ground plane with thermal vias for heat transfer; without proper EP soldering the device will overheat at sustained ±500 mA loads. Estimated: at VIN=24 V, VOUT=12 V, IOUT=500 mA, dissipation = (24-12)*0.5 = 6 W, which requires the EP to be mounted on at least 1 square inch of 2 oz copper to keep junction rise within the 85 °C industrial limit.
Place a 1 µF low-ESR ceramic bypass capacitor as close as possible to each V+ and V- supply pin, and add a 10 µF bulk capacitor on each rail at the board entry point. The ILIM+ and ILIM- reference voltages should be filtered with 0.1 µF capacitors to prevent noise-induced current-limit jitter; this is critical when programming sub-100 mA limits. Do not exceed the absolute maximum differential supply of 36 V.
A common mistake is leaving ILIM+ or ILIM- floating - if either pin is left open, the internal default may allow full ±500 mA without limit protection. Always tie ILIM+ and ILIM- to defined reference voltages through low-impedance dividers. Also, do not use the output (pin 12) as a current-sense point - the LT1970 samples current internally; external sense resistors are not required and will degrade accuracy.
Keep the input traces (IN+, IN-) short and shielded with a ground guard trace to prevent noise pickup, especially at high source/sink currents. Place the feedback resistors directly at the IN- pin with the inverting input trace running over a continuous ground plane. The exposed pad must be electrically tied to the system ground (V-) to provide the return path for the high-current output stage.
Información de cumplimiento
LT1970IFE#PBF variant is lead-free and RoHS-compliant per Analog Devices ordering information. Halogen-free status not explicitly stated in the verified web data. AEC-Q100 not applicable for this op amp family.
