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STMicroelectronics L5980TR
- Part No.:
- L5980TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
L5980TR.pdf
- Description:
- IC REG BUCK ADJ 700MA 8VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,128
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Product details
Overview
L5980TR from STMicroelectronics is a 0.7 A step-down switching regulator with integrated P-channel MOSFET, designed for DC-DC conversion in space-constrained power rails. It operates from 2.9 V to 18 V input, delivers adjustable output down to 0.6 V, features 250 kHz–1 MHz programmable switching frequency, internal soft-start, and 100% duty-cycle low-dropout operation - used in LCD TV power supplies and FPGA core voltage regulation.
For engineers reviewing the L5980TR datasheet, L5980TR pinout, L5980TR application, or L5980TR equivalent, key selection criteria include input voltage range (2.9–18 V), output adjustability (0.6 V min), thermal resistance (60 °C/W), overcurrent/thermal protection behavior, and VFQFPN8 package compatibility with high-density PCB layouts.
Technical Context
The L5980TR implements voltage-mode PWM control with feedforward compensation: input voltage and switching frequency variations dynamically adjust sawtooth slope to maintain constant PWM gain. Its oscillator supports free-running (250 kHz) or resistor-programmed operation up to 1 MHz via the FSW pin, and synchronization capability enables phase-shifted multi-device operation via the SYNCH pin.
Functional blocks include a 0.6 V reference-based error amplifier with COMP pin for external Type II/III compensation, peak-current-limited P-channel MOSFET driver, UVLO with 2.9 V turn-on threshold and 0.175–0.3 V hysteresis, and hiccup-mode overcurrent protection that transitions between pulse-skipping (soft-start) and thermal-cycled shutdown (regulated output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 0.7 A DC continuous; supports >0.7 A under favorable thermal conditions with VFQFPN8 exposed pad |
| Input voltage range | 2.9 V to 18 V; compatible with 3.3 V bus systems due to low VIN(min) |
| Output voltage range | 0.6 V to VIN; set via external resistor divider on FB pin |
| Switching frequency | 250 kHz (default), programmable up to 1 MHz via FSW-to-GND resistor |
| RDS(on) | 140–220 mΩ (typ. 170 mΩ); defines conduction loss and thermal rise at full load |
| Thermal resistance | RthJA = 60 °C/W; achieved with VFQFPN8 3 × 3 mm package on demo board |
| Protection features | Overcurrent (hiccup + pulse skipping), thermal shutdown (150 °C trip, 30 °C hysteresis), UVLO |
Pinout & Package
VFQFPN8 3 × 3 mm package with exposed thermal pad (pin 1–8 top view); optimized for low RthJA and compact layout in consumer and industrial power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulator output | Power switch drain node; connects directly to LC filter output and load |
| SYNCH (Pin 2) | Synchronization I/O | Master/slave sync signal; floating → 180° phase-shifted internal clock; driven externally → zero-phase sync |
| INH (Pin 3) | Inhibit control | Active-high enable: <0.6 V = ON, >1.9 V = OFF; internal pull-up disables device if floating |
| COMP (Pin 4) | Error amplifier output | External compensation node for loop stability; supports Type II/III networks |
| FB (Pin 5) | Feedback input | Resistor-divider node sensing VOUT; regulates to 0.6 V reference |
| FSW (Pin 6) | Frequency programming | Connect resistor to GND to scale switching frequency up to 1 MHz; floating = 250 kHz |
| GND (Pin 7) | Power ground | Main return path for power stage and IC bias; tied to exposed pad for thermal conduction |
| VCC (Pin 8) | Unregulated input | Bias supply for internal circuitry; also powers gate driver; must be decoupled near pin |
Key Features
| Feature | Design Value |
|---|---|
| Voltage feedforward | Dynamic sawtooth slope adjustment maintains constant PWM gain across input voltage changes |
| Zero-load operation | Stable regulation with no minimum load required - eliminates need for dummy loads |
| 100% duty cycle | Enables dropout-free operation when VOUT ≈ VIN, critical for battery-backed or low-VIN applications |
| Internal soft-start | 64-step staircase ramp (9.5 mV/step) ensures monotonic VOUT rise and limits inrush current |
| Hiccup overcurrent | Auto-recovery shutdown during sustained overload prevents thermal runaway without manual reset |
Applications
| Consumer LCD Power Supply | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Powering 1.2 V/1.8 V logic rails in LCD TV main board with 12 V input bus. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated core voltage with tight transient response. Use Value: Adjustable 0.6 V output supports multiple FPGA I/O standards; 250 kHz–1 MHz frequency tuning optimizes EMI vs. efficiency trade-off. | Use Scenario: Generating configurable 1.0–1.5 V supply for Xilinx Spartan-6 FPGA core from 5 V or 12 V intermediate rail. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with fast load-step response enabled by voltage-mode control. Use Value: Internal 0.6 V reference and COMP pin allow precise loop compensation for stable operation under dynamic FPGA current profiles. |
| Car Audio DSP Power | Industrial PLC I/O Module |
Use Scenario: Providing clean 3.3 V supply to digital signal processor in automotive head unit with wide input variation (9–16 V). IC Role / Device Role / Timing Role: Input-voltage-robust buck regulator with UVLO hysteresis preventing brownout oscillation. Use Value: 2.9 V start-up and 0.175–0.3 V UVLO hysteresis ensure reliable operation during cold-crank transients. | Use Scenario: Generating isolated 5 V or 3.3 V auxiliary supply for analog sensor interface in DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC stage replacing linear regulators in space-limited enclosures. Use Value: VFQFPN8 package with 60 °C/W RthJA enables 0.7 A output without heatsink in convection-cooled industrial chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 0.7 A, 2.5–24 V input, fixed 3.3/5 V or adjustable; no SYNC pin; RDS(on) = 220 mΩ | Lacks synchronization and voltage feedforward; less suitable for multi-rail coordinated timing | Select when cost sensitivity outweighs sync/feedforward needs and fixed-output variants suffice |
| TPS5430DDAR | 3 A, 5.5–36 V input, 2.5–36 V adjustable output; external MOSFET; 500 kHz max fSW | Higher current, wider VIN, but requires external FET and more BOM components | Choose for higher-power designs where internal FET limitation of L5980TR is insufficient |
Compared with MP2307DN-LF-Z and TPS5430DDAR, the L5980TR uniquely balances integration (internal P-FET), precision (0.6 V ref), and system-level features (SYNC, feedforward) in a thermally optimized 3×3 mm package - ideal for mid-power, space-constrained, multi-rail applications requiring coordinated switching.
Availability
L5980TR is available at Aetrix Electronics and suitable for LCD TV power supplies, FPGA core voltage regulation, car audio DSP power, and industrial PLC I/O modules requiring stable component supply across extended production lifecycles.
Supply support for L5980TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
The L5980TR belongs to ST's high-efficiency monolithic buck regulator product line, engineered for compact, thermally robust DC-DC conversion in cost-sensitive and space-constrained applications from consumer electronics to industrial controls.
FAQ
What is the minimum input voltage required for L5980TR startup?
The L5980TR requires a minimum input voltage of 2.9 V to initiate operation, verified by its VCCON threshold specification. Below this level, the UVLO circuit holds the device disabled. This allows direct use on 3.3 V buses with margin for droop, and supports automotive cold-crank scenarios where input may dip near 3 V.
Can L5980TR operate with zero output load?
Yes, the L5980TR supports zero-load operation without instability or shutdown. Its control architecture maintains regulation even with no current draw, eliminating the need for minimum load resistors - confirmed by "Zero load current operation" in official features and functional description section 4.2.
How does the SYNCH pin function when connecting two L5980TR devices?
When SYNCH pins of two L5980TRs are connected, the higher-frequency device acts as master and the other as slave, resulting in 180° phase-shifted switching. This reduces RMS input capacitor current and eases thermal design - detailed in Section 4.1 and Figure 4 of the datasheet, with measured phase relationship confirmed in application circuit analysis.
What compensation network type is recommended for ceramic output capacitors with low ESR?
A Type II compensation network is recommended for ceramic output capacitors with low ESR, as their inherent zero helps counteract the double pole of the LC filter. This is explicitly stated in Section 4.3 and elaborated in Section 5.4.1 of the datasheet, with design equations and stability guidance provided for loop tuning.
L5980TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 700mA
- Frequency - Switching:
- 250kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFQFPN (3x3)
L5980TR FAQ
1.How can I place an order for L5980TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L5980TR 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 L5980TR reliable?
The price and inventory of L5980TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5980TR is usually 5 days.
3.What payment methods are accepted for L5980TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5980TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L5980TR?
L5980TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L5980TR 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 L5980TR?
For technical support, including L5980TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5980TR requirements.
6.How does Aetrix verify that L5980TR is sourced from the original manufacturer or authorized distributors?
All L5980TR 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 L5980TR meets industry standards.
7.What is the process for return or replacement of L5980TR?
All L5980TR units undergo pre-shipment inspection (PSI). If there is an issue with L5980TR, 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 L5980TR part is unused and in its original packaging.
Return procedure for L5980TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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