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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics L7980TR

Name: L7980TR
Brand: STMicroelectronics
SKU: L7980TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7980TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-VFDFN Exposed Pad

Datasheet:: L7980TR.pdf

Description:: IC REG BUCK ADJ 2A 8VFQFPN

Quantity:: RFQ Add To RFQ list

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Inventory:3,949

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Product details

Overview

L7980TR from STMicroelectronics is a 2 A step-down switching regulator with integrated P-channel MOSFET, designed for mid-power DC-DC conversion in space-constrained industrial and consumer systems. It operates from 4.5 V to 28 V input, delivers adjustable output down to 0.6 V, features 250 kHz–1 MHz programmable switching frequency, internal soft-start, and supports 100% duty cycle for low-dropout operation.

For engineers reviewing the L7980TR datasheet, L7980TR pinout, L7980TR application, or L7980TR equivalent, key selection criteria include its voltage-mode control architecture, synchronization capability via SYNCH pin, thermal shutdown at 150 °C with 30 °C hysteresis, and dual-package availability (VFQFPN 3×3–8L and HSOP8) enabling optimized thermal performance in FPGA power rails, LCD TV supplies, and optical storage subsystems.

Technical Context

The L7980TR implements voltage-mode PWM control with a fixed-frequency sawtooth oscillator whose slope is dynamically adjusted via voltage feed-forward (input-dependent) and frequency feed-forward (FSW-resistor dependent) to maintain constant PWM gain across line and frequency variations. Its error amplifier provides 100 dB open-loop gain and 4.5 MHz GBWP, supporting stable Type II or Type III compensation networks depending on output capacitor ESR.

Overcurrent protection uses blanking-time–gated peak-current sensing (200 ns masking), delivering hiccup-mode recovery under sustained overload and pulse-skipping current limiting during soft-start. Thermal shutdown is hysteretic (150 °C trip, ~130 °C recovery), with sensing localized near the PDMOS die region for fast response.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	2 A continuous; limited by internal 2.5 A min MOSFET and thermal design (R_thJA = 60 °C/W for VFQFPN, 40 °C/W for HSOP8)
Input voltage range	4.5 V to 28 V; UVLO threshold 4.4 V with 0.12–0.35 V hysteresis ensures clean startup under brownout
Output voltage range	0.6 V to V_IN; set via external resistor divider on FB pin; 0.6 V internal reference with ±1.2% tolerance (0.593–0.607 V)
Switching frequency	250 kHz base (FSW floating); adjustable up to 1 MHz via resistor to GND; enables optimization of size vs. efficiency trade-off
MOSFET R_DS(on)	160–180 mΩ typical; determines conduction loss and thermal rise at full load
Soft-start duration	7.4–9.1 ms at 250 kHz; scales inversely with FSW (e.g., ~2.3 ms at 1 MHz); prevents inrush into bulk capacitance
Quiescent current	2.4 mA active, 20–30 µA standby; enables low-power hold modes in battery-backed or always-on systems

Pinout & Package

Available in VFQFPN 3 × 3 mm – 8L (exposed pad, R_thJA = 60 °C/W) and HSOP8 (exposed pad, R_thJA = 40 °C/W) packages. Both support high-power density layouts with low thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
OUT	Regulator output	Switch node connection to LC filter; carries high di/dt pulsed current - requires short, wide trace and local ceramic decoupling
SYNCH	Synchronization I/O	Master/slave sync interface: floating = 180° phase-shifted internal clock; driven externally = zero-phase sync; tied between two devices enables interleaved operation
EN	Enable control	Active-high logic input (0.3 V OFF / 1.2 V ON); internal pull-down disables device if floating; supports sequencing and power-domain isolation
COMP	Error amplifier output	High-impedance node for external compensation network (Type II/III); source/sink capability: 17 mA / 25 mA
FB	Feedback input	Resistor-divider tap point for output voltage regulation; referenced to 0.6 V internal bandgap; max voltage 1.5 V
FSW	Frequency setting	Resistor-to-GND sets oscillator frequency (250 kHz–1 MHz); voltage = 1.254 V; open = default 250 kHz
GND	Power and signal ground	Common return for power stage, control circuitry, and exposed thermal pad; must be low-inductance plane connection
VCC	Unregulated input supply	Bias rail for internal circuitry; accepts full 4.5–28 V range; requires local 100 nF–1 µF ceramic bypass close to pin

Key Features

Feature	Design Value
Voltage feed-forward	Adjusts sawtooth slope with input voltage to maintain constant PWM gain - improves line transient response without loop redesign
Frequency feed-forward	Modifies sawtooth amplitude when FSW resistor changes frequency - preserves PWM gain stability across 250 kHz–1 MHz range
Zero-load operation	Stable regulation at no load due to controlled quiescent current and error amplifier biasing - eliminates need for dummy loads
Hysteretic thermal shutdown	150 °C trip with ~20 °C hysteresis ensures safe restart after cooling - avoids thermal cycling damage during sustained overload
Internal soft-start	64-step staircase ramp on error amp reference (0 → 0.6 V) - guarantees monotonic V_OUT rise and limits inrush into downstream capacitance

Applications

FPGA Core Power Supply

LCD TV Backlight Driver

Use Scenario: Providing tightly regulated 1.2 V core voltage to Xilinx Spartan-7 FPGA under dynamic load transients up to 1.8 A.

IC Role / Device Role / Timing Role: Primary buck converter with voltage-mode control, synchronized to system clock via SYNCH pin to reduce input ripple RMS.

Use Value: 250 kHz–1 MHz adjustability allows optimizing inductor size for board height constraints while maintaining <2% output deviation during 1 A/µs load steps.

Use Scenario: Generating 12 V bias for LED string drivers in 32-inch LCD TV main board, operating from 19 V adapter input.

IC Role / Device Role / Timing Role: Mid-power buck regulator with 100% duty cycle capability to sustain output during low-line dips to 18.5 V.

Use Value: Low R_DS(on) (160 mΩ typ.) and HSOP8 package (R_thJA = 40 °C/W) enable 92% efficiency at 1.5 A without heatsink.

Optical Storage Actuator Supply

DSL Modem Line Card DC-DC

Use Scenario: Delivering 5 V/1.2 A to voice coil motor driver IC in Blu-ray disc drive sled mechanism.

IC Role / Device Role / Timing Role: Compact, low-noise buck regulator with soft-start and overcurrent hiccup protection to prevent latch-up during mechanical stall events.

Use Value: Pulse-skipping OCP during soft-start limits peak current to 2.5 A, preventing actuator coil saturation and position error.

Use Scenario: Generating isolated 3.3 V rail for ADSL2+ PHY and microcontroller in residential DSL modem.

IC Role / Device Role / Timing Role: Input-filter–tolerant buck converter operating from 12 V DC bus with robust UVLO and thermal shutdown.

Use Value: 4.4 V UVLO threshold and 0.35 V hysteresis prevent erratic restarts during AC adapter brownouts common in low-voltage grid conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315DJ-LF-Z	3 A rated, 4.5–28 V input, fixed 500 kHz f_SW, no SYNCH pin, smaller QFN-8 (2×2 mm)	Lacks synchronization and adjustable frequency; higher current rating but lower thermal margin in same footprint	Preferred where board area is critical and interleaving not required; verify thermal performance at 2 A continuous
TPS54202DRCT	2 A, 4.5–28 V, 400 kHz–2.5 MHz adjustable f_SW, integrated BOOT diode, no exposed pad in VSON-10	Higher max frequency and integrated high-side FET bootstrap path; lacks voltage feed-forward and has higher R_DS(on) (200 mΩ)	Chosen when ultra-fast transient response is prioritized over line regulation; requires careful BOOT capacitor layout

Compared with MP2315DJ-LF-Z and TPS54202DRCT, the L7980TR uniquely combines voltage + frequency feed-forward for superior line regulation, true 100% duty cycle operation, and dual-package thermal scalability - making it optimal for FPGA, LCD, and optical storage applications demanding predictable transient behavior and thermal headroom.

Availability

L7980TR is available at Aetrix Electronics and suitable for FPGA core supplies, LCD TV bias rails, optical storage actuator drivers, and DSL modem DC-DC modules requiring stable component supply, long-term lifecycle assurance, and production-ready qualification.

Supply support for L7980TR 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 L7980TR belongs to ST's high-efficiency monolithic buck regulator product line, engineered for reliable mid-power DC-DC conversion in thermally demanding, space-constrained applications such as set-top boxes, PLCs, and optical storage systems.

FAQ

What is the minimum output voltage achievable with the L7980TR?

The L7980TR supports an output voltage as low as 0.6 V, set by its internal precision bandgap reference. This value is specified at ±1.2% (0.593–0.607 V) over temperature and line, enabling accurate low-voltage core supplies for modern FPGAs and ASICs without external reference components.

Can the L7980TR operate with 100% duty cycle, and under what conditions?

Yes - the L7980TR supports true 100% duty cycle operation when the input voltage approaches the desired output voltage (e.g., 5.2 V IN → 5.0 V OUT). This is enabled by its P-channel high-side MOSFET architecture and internal gate drive design, eliminating dropout voltage limitations seen in N-channel-based regulators.

How does the SYNCH pin function in master-slave configurations?

When two L7980TR devices have their SYNCH pins tied together, the unit with the higher oscillator frequency automatically becomes the master, and the other synchronizes with zero phase shift. If both run at identical frequencies, the natural propagation delay creates a ~180° phase offset, reducing input capacitor RMS current by up to 30% in interleaved designs.

What is the purpose of voltage and frequency feed-forward in the L7980TR?

Voltage feed-forward adjusts the sawtooth slope proportionally to input voltage, while frequency feed-forward modifies it with switching frequency - both preserve constant PWM gain. This eliminates the need to retune compensation across input ranges or frequency settings, significantly improving line transient response and simplifying design reuse.

L7980TR 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):: 4.5V

Voltage - Input (Max):: 28V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 28V

Current - Output:: 2A

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)

L7980TR FAQ

1.How can I place an order for L7980TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L7980TR 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 L7980TR reliable?

The price and inventory of L7980TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7980TR is usually 5 days.

3.What payment methods are accepted for L7980TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7980TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7980TR?

L7980TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7980TR 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 L7980TR?

For technical support, including L7980TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7980TR requirements.

6.How does Aetrix verify that L7980TR is sourced from the original manufacturer or authorized distributors?

All L7980TR 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 L7980TR meets industry standards.

7.What is the process for return or replacement of L7980TR?

All L7980TR units undergo pre-shipment inspection (PSI). If there is an issue with L7980TR, 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 L7980TR part is unused and in its original packaging.

Return procedure for L7980TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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