L7980TR - 2A Step-Down Switching Regulator | STMicroelectronics
MPN: L7980TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for L7980TR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
L7980
β Drop-Inπ Reference alternative (not in catalog)
L7980A
β Drop-Inπ Reference alternative (not in catalog)
TPS5430
β Drop-Inπ Reference alternative (not in catalog)
NCP3063
β Drop-Inπ Reference alternative (not in catalog)
L7980TR Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Output Voltage Range | 0.6 V to 28 V |
| Maximum Output Current | 2 A |
| Input Voltage Range | 4.5 V to 28 V |
| Switching Frequency | 250 kHz |
| Efficiency | Up to 90% |
| RDS(on) of Internal MOSFET | 250 mOhm |
| Quiescent Current | 1.3 mA |
| Shutdown Current | 1 uA |
| Operating Temperature | -40C to +150C |
| Package | SO-8 (SOIC-8) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| Enable Pin | Yes (active-high) |
L7980TR Pin Configuration
| Pin 1 | VIN β Input supply voltage |
| Pin 2 | GND β Ground |
| Pin 3 | EN β Enable (active high) |
| Pin 4 | COMP β Compensation (internal, leave open) |
| Pin 5 | FB β Feedback voltage |
| Pin 6 | SW β Switch node output |
| Pin 7 | VIN β Input supply voltage |
| Pin 8 | GND β Ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
L7980TR is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for L7980TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Lower switching frequency reduces EMI (vs TPS5430)
- Automotive grade variant available (vs L7980)
- Higher output current than NCP3063 (vs NCP3063)
Design Notes
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.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified - choose L7980A for automotive.
