L7980TR - 2A Step-Down Switching Regulator | STMicroelectronics
N.º da peça: L7980TR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.25 | $1,25 |
| 10 | $1.12 | $11,20 |
| 100 | $0.98 | $98,00 |
| 500 | $0.85 | $425,00 |
| 1.000 | $0.72 | $720,00 |
L7980TR Visão geral
A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor, a switch, and a diode to transfer energy in discrete pulses, achieving efficiencies often above 90%. This makes them essential in battery-powered and high-current applications where power loss must be minimized. The L7980TR belongs to the broader category of power management ICs, specifically within the DC-DC converter family.
Key features of the L7980TR include a 250 kHz fixed switching frequency, an internal power MOSFET with a low RDS(on) of 250 mOhm, and a high-efficiency design that minimizes external component count. The device also includes an internal compensation network, soft-start, and thermal shutdown protection, simplifying the design process. The adjustable output voltage, set by an external resistor divider, allows flexibility for various output levels.
The L7980TR utilizes a current-mode control architecture, providing fast transient response and stable operation over a wide range of load currents. The internal compensation eliminates the need for external compensation components, reducing board space and design complexity. The device's high switching frequency allows the use of small, low-cost inductors and capacitors, further reducing the overall solution footprint.
Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microcontrollers, as well as distributed power systems, battery chargers, and industrial control systems. The wide input voltage range makes it suitable for 12V and 24V industrial buses, while the high efficiency extends battery life in portable devices.
When designing with the L7980TR, ensure proper PCB layout with short, wide traces for high-current paths and adequate grounding. The exposed pad (if present) should be connected to the ground plane for thermal dissipation. Input and output capacitors should be placed close to the IC to minimize parasitic inductance and ensure stable operation.
Alternativas drop-in para L7980TR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
L7980
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
L7980A
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
TPS5430
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
NCP3063
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
L7980TR Classificações máximas e características elétricas
| Tipo de saída | Adjustable |
| Faixa de tensão de saída | 0.6 V to 28 V |
| Corrente máxima de saída | 2 A |
| Faixa de tensão de entrada | 4.5 V to 28 V |
| Frequência de comutação | 250 kHz |
| Eficiência | Up to 90% |
| RDS(on) of Internal MOSFET | 250 mOhm |
| Corrente de repouso | 1.3 mA |
| Corrente de desligamento | 1 uA |
| Temperatura de operação | -40C to +150C |
| Encapsulamento | SO-8 (SOIC-8) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (unlimited) |
| Status RoHS | Compliant |
| Pino de habilitação | Yes (active-high) |
Configuração de pinos do L7980TR
| Pino 1 | VIN — Input supply voltage |
| Pino 2 | GND — Ground |
| Pino 3 | EN — Enable (active high) |
| Pino 4 | COMP — Compensation (internal, leave open) |
| Pino 5 | FB — Feedback voltage |
| Pino 6 | SW — Switch node output |
| Pino 7 | VIN — Input supply voltage |
| Pino 8 | GND — Ground |
Aplicações típicas
L7980TR é adequado para 6 aplicaçãos: Point-of-Load (POL) Converters, Distributed Power Systems, Battery Chargers, Industrial Control Systems, Telecom and Networking Equipment, Consumer Electronics.
Point-of-Load (POL) Converters
The L7980TR is ideal for POL converters powering FPGAs, DSPs, and microcontrollers. Its 2A output current and adjustable voltage down to 0.6V provide a flexible solution for core and I/O rails. The high efficiency (up to 90%) reduces heat dissipation, and the internal compensation simplifies design. In a typical POL application, the L7980TR is placed close to the load, converting a 12V or 5V bus to the required core voltage. The fixed 250 kHz switching frequency allows the use of small inductors, minimizing board space. Performance considerations include ensuring adequate input and output capacitance for stable operation and fast transient response.
Recomendado
Distributed Power Systems
In distributed power systems, the L7980TR converts a 24V or 48V bus voltage down to local rails. Its wide input range (4.5V to 28V) and 2A output make it suitable for powering sensors, actuators, and control logic. The device's high efficiency reduces power loss in the distribution network, and its thermal shutdown protection ensures reliability. In a typical application, the L7980TR is used as a secondary regulator after an isolated DC-DC converter, providing a clean, regulated output for sensitive electronics. Performance considerations include proper heat sinking for high current loads and careful PCB layout to minimize parasitic inductance.
Recomendado
Battery Chargers
The L7980TR can be used in battery charger circuits to step down a higher input voltage to the battery charging voltage. Its adjustable output and current limit capability allow precise control of the charging profile. The high efficiency minimizes heat generation during charging, and the low shutdown current (1 uA) preserves battery life when the charger is idle. In a typical application, the L7980TR is configured as a constant-voltage/constant-current charger, with the output voltage set by a resistor divider and the current limit set by an external sense resistor. Performance considerations include thermal management during fast charging and ensuring stable operation with varying battery voltages.
Recomendado
Industrial Control Systems
The L7980TR is well-suited for industrial control systems that require reliable power from 24V buses. Its wide input range and robust thermal performance make it ideal for factory automation, PLCs, and motor control units. The device's internal compensation and fixed switching frequency simplify design, while the enable pin allows for power sequencing in multi-rail systems. In a typical application, the L7980TR powers a microcontroller and its peripherals, converting 24V to 5V or 3.3V. Performance considerations include ensuring adequate input filtering to handle transients and using proper PCB layout to minimize EMI.
Recomendado
Telecom and Networking Equipment
In telecom and networking equipment, the L7980TR provides efficient power conversion from 12V or 24V rails to lower voltages for line cards, switches, and routers. Its high efficiency reduces heat in densely packed equipment, and its small SO-8 package saves board space. The device's adjustable output allows it to power various logic levels, from 1.8V to 5V. In a typical application, the L7980TR is used as a POL converter for an ASIC or FPGA, with the output voltage set to the required core voltage. Performance considerations include minimizing output ripple and ensuring stable operation under varying load conditions.
Recomendado
Consumer Electronics
The L7980TR is used in consumer electronics such as set-top boxes, gaming consoles, and smart home devices. Its high efficiency and low shutdown current make it ideal for battery-powered or energy-efficient products. The device's small package and minimal external components reduce manufacturing cost and board space. In a typical application, the L7980TR converts a 12V adapter voltage to 5V or 3.3V for the main logic board. Performance considerations include ensuring low standby power consumption and meeting EMI regulations with proper filtering.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para L7980TR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | L7980 | L7980A | TPS5430 | NCP3063 |
|---|---|---|---|---|---|
| Package | SO-8 | SO-8 - same | SO-8 - same | SO-8 - same | SO-8 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments | onsemi |
| Output Current | 2 A | 2 A | 2 A | 3 A | 1.5 A |
| Input Voltage Range | 4.5V to 28V | 4.5V to 28V | 4.5V to 28V | 5.5V to 36V | 3V to 40V |
| Switching Frequency | 250 kHz | 250 kHz | 250 kHz | 500 kHz | 150 kHz |
| Efficiency | Up to 90% | Up to 90% | Up to 90% | Up to 92% | Up to 85% |
| Enable Pin | Yes | Yes | Yes | Yes | No |
| Automotive Grade | No | No | Yes (AEC-Q100) | No | No |
Principais diferenciais
- Lower switching frequency reduces EMI (vs TPS5430)
- Automotive grade variant available (vs L7980)
- Higher output current than NCP3063 (vs NCP3063)
Notas de projeto
For optimal performance, place the input capacitor (10uF) and output capacitor (22uF) as close to the VIN and SW pins as possible. Use short, wide traces for high-current paths to minimize parasitic inductance and resistance. Connect the GND pins directly to the ground plane with multiple vias to reduce thermal and electrical impedance.
The L7980TR in SO-8 package has a thermal resistance (theta_JA) of approximately 100 C/W. At 2A output with a 12V to 5V conversion, power dissipation is about 1.4W, resulting in a 140C junction temperature rise. Ensure adequate copper area on the PCB for heat dissipation, and consider a thermal pad or heatsink for high ambient temperatures.
Do not exceed the absolute maximum input voltage of 28V. Ensure the feedback resistor divider uses 1% tolerance resistors to maintain output voltage accuracy. The COMP pin is internally compensated and should be left unconnected. Avoid routing the SW node near sensitive analog traces to prevent EMI coupling.
Informações de conformidade
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified - choose L7980A for automotive.
