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

STMicroelectronics L7980A

Name: L7980A
Brand: STMicroelectronics
SKU: L7980A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L7980A

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: L7980A.pdf

Description:: IC REG BUCK ADJ 2A 8HSOP

Quantity:: RFQ Add To RFQ list

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Inventory:3,992

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Product details

Overview

L7980A from STMicroelectronics is a 2 A synchronous step-down DC-DC switching regulator with integrated P-channel MOSFET, designed for mid-power point-of-load conversion in 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 L7980A datasheet, L7980A pinout, L7980A application, or L7980A equivalent, key selection criteria include its voltage-mode control architecture, feed-forward compensation for line/load transient immunity, thermal shutdown with 30 °C hysteresis, and dual-package support (VFQFPN 3×3–8L and HSOP8) enabling board-level thermal optimization.

Technical Context

The L7980A implements voltage-mode PWM control with a fixed-frequency sawtooth oscillator whose slope is dynamically adjusted via voltage feed-forward (input-dependent ramp scaling) and frequency feed-forward (FSW-resistor–dependent ramp scaling), maintaining constant PWM gain across input voltage and switching frequency variations. Its error amplifier provides 100 dB open-loop gain, 4.5 MHz GBWP, and rail-to-rail output swing (0–3.3 V) for robust loop stability.

Synchronization capability allows master/slave operation via the SYNCH pin: when two devices are connected, the higher-frequency unit acts as master with 180° phase shift, reducing input capacitor RMS current; external clock synchronization is supported with amplitude-adjusted sawtooth to preserve gain integrity during loop compensation design.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	2 A continuous load current; limited by internal 2.5 A min current-limit MOSFET and thermal design (R_thJA = 40 °C/W in HSOP8).
Input voltage range	4.5 V to 28 V; includes 30 V absolute max rating and 4.4 V turn-on UVLO threshold with 0.12–0.35 V hysteresis.
Output voltage adjustability	0.6 V minimum setpoint; achieved via external resistor divider on FB pin; reference accuracy ±1.17% (0.593–0.607 V at 25 °C).
Switching frequency	250 kHz base, programmable up to 1 MHz via resistor on FSW pin; enables trade-off between efficiency (lower f_SW) and size (higher f_SW).
MOSFET R_DS(on)	160–180 mΩ typical; defines conduction loss and thermal rise under full load; measured at T_J = 25 °C.
Soft-start duration	7.4–9.1 ms at 250 kHz; determined by 64-step 9.5 mV staircase and clock-cycle timing; prevents inrush current and ensures monotonic V_OUT ramp.
Thermal shutdown	150 °C trip with 30 °C hysteresis; sensing element placed near PDMOS die region for fast, localized junction temperature response.

Pinout & Package

The L7980A is available in two thermally enhanced packages: VFQFPN 3 × 3 mm, 8-lead with exposed pad (R_thJA = 60 °C/W), and HSOP8 with exposed pad (R_thJA = 40 °C/W). Both support high-current PCB layout and efficient heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
OUT	Regulated power output node	Connects directly to LC filter output; carries full 2 A switched current; requires low-inductance path to minimize ringing.
SYNCH	Master/slave synchronization interface	Accepts external clock or connects to another L7980A SYNCH pin; enables phase-shifted interleaving to halve input capacitor RMS current.
EN	Enable control input (active-high)	Logic threshold: <0.3 V = OFF (<30 µA I_QST-BY), >1.2 V = ON; internal pull-down holds floating EN low.
COMP	Error amplifier output	Provides access to EA output for external Type II/III compensation network; capable of sourcing 17 mA / sinking 25 mA.
FB	Feedback voltage sense input	Compares against internal 0.6 V reference; sets output via resistor divider; max input voltage = 1.5 V (absolute max).
FSW	Frequency programming input	Connects to ground via resistor to scale switching frequency up to 1 MHz; floating = 250 kHz default.
GND	Power and signal ground reference	Must be tied to exposed pad; forms return path for high di/dt currents; critical for EMI and thermal performance.
VCC	Main power input supply	Unregulated input (4.5–28 V); powers internal bias circuitry and gate driver; requires local 100 nF–1 µF ceramic bypass.

Key Features

Feature	Design Value
Voltage feed-forward compensation	Adjusts sawtooth slope proportionally to V_IN, stabilizing PWM gain and improving line transient response without loop redesign.
Frequency feed-forward compensation	Modifies sawtooth slope based on FSW resistor setting, preserving PWM gain across 250 kHz–1 MHz range for consistent loop behavior.
Hiccup-mode overcurrent protection	Enters safe cycling (off-time = 2048 clock cycles) during sustained overload or short-circuit, limiting average power dissipation and enabling self-recovery.
Zero-load quiescent operation	Delivers regulated output with no minimum load requirement; maintains regulation down to 0 A output current via adaptive biasing.
100% duty cycle capability	Supports dropout operation (V_OUT ≈ V_IN) by holding high-side switch fully on-critical for battery-powered or wide-input applications.

Applications

FPGA Core Power Supply

Automotive Infotainment DC-DC Stage

Use Scenario: Providing stable 1.2 V core voltage to Xilinx Spartan-7 FPGA under dynamic load (0–1.8 A).

IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise core power with fast transient response.

Use Value: Voltage feed-forward ensures <50 mV line transient deviation during 12 V battery swing; soft-start prevents configuration corruption during cold crank.

Use Scenario: Converting 12 V vehicle battery to 5 V for audio DSP, display controller, and USB hub in head unit.

IC Role / Device Role / Timing Role: Mid-power buck converter operating across automotive temperature range (−40 °C to +125 °C).

Use Value: Thermal shutdown with 30 °C hysteresis prevents latch-up during prolonged high-temperature operation; HSOP8 package achieves 40 °C/W R_thJA.

Industrial PLC I/O Module Supply

LED Backlight Driver Reference Stage

Use Scenario: Generating 3.3 V for isolated CAN transceivers and microcontroller peripherals in DIN-rail mounted PLC.

IC Role / Device Role / Timing Role: Robust, EMC-hardened buck stage powering noise-sensitive digital interfaces.

Use Value: Synchronization capability enables interleaved dual-L7980A design, cutting input capacitor RMS current by 30% and easing EMI filtering.

Use Scenario: Supplying precision 5 V reference to LED driver ICs controlling LCD TV backlight strings.

IC Role / Device Role / Timing Role: Low-drift, low-noise intermediate supply ensuring accurate LED current regulation.

Use Value: 0.6 V reference tolerance (±1.17%) and COMP pin accessibility enable <1% output voltage drift over temperature and line variation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2451DT-LF-Z (Monolithic Power)	2 A rated, 36 V max input, fixed 500 kHz f_SW, no SYNCH or feed-forward; R_DS(on) = 220 mΩ.	Lacks synchronization and feed-forward; less suitable for multi-rail interleaving or wide-line-swing systems.	Choose for cost-sensitive, single-rail designs where 36 V input headroom outweighs transient performance needs.
TPS54202HDDCR (Texas Instruments)	2 A, 6–17 V input, 400 kHz–2.5 MHz programmable f_SW, voltage-mode with feed-forward, but no SYNCH pin.	No master/slave sync capability; limited to single-phase operation; tighter input range excludes 24 V industrial rails.	Select when ultra-high f_SW (>1 MHz) and small solution size are prioritized over multi-phase scalability.

Compared with MP2451DT-LF-Z and TPS54202HDDCR, the L7980A uniquely combines synchronization, dual feed-forward compensation, and 4.5–28 V input flexibility-making it optimal for thermally constrained, multi-rail industrial and automotive systems requiring coordinated transient immunity and thermal resilience.

Availability

L7980A is available at Aetrix Electronics and suitable for FPGA power delivery, automotive infotainment subsystems, and industrial PLC I/O modules requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for L7980A 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 L7980A belongs to ST's high-efficiency monolithic buck regulator product line, engineered for reliable mid-power conversion in thermally demanding environments with minimal external components.

FAQ

What is the minimum output voltage achievable with the L7980A?

The L7980A has an internal 0.6 V feedback reference with ±1.17% tolerance (0.593–0.607 V at 25 °C). With the FB pin connected directly to V_OUT, the minimum regulated output is 0.6 V. Using an external resistor divider, outputs up to V_IN can be set, but no lower than 0.6 V due to reference limitation.

Can the L7980A operate with zero load current?

Yes-the L7980A supports zero-load operation while maintaining regulation. Its bias circuitry remains active, and the error amplifier continues closed-loop control even at 0 A output. Quiescent current in regulation is 2.4 mA, and standby current drops to 20–30 µA when disabled via EN pin.

How does the SYNCH pin function in master/slave configuration?

When two L7980A devices have their SYNCH pins connected, the unit with the higher oscillator frequency becomes master and drives the other as slave with 180° phase shift. This interleaving reduces input capacitor RMS current by ~30%. No external clock is required-synchronization is automatic and self-configuring.

What is the purpose of voltage and frequency feed-forward in the L7980A?

Voltage feed-forward adjusts the sawtooth ramp slope proportional to V_IN, while frequency feed-forward scales it with programmed f_SW. Together, they maintain constant PWM gain across input voltage and frequency changes-enabling stable loop compensation and superior line/load transient response without re-tuning.

L7980A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

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-HSOP

L7980A FAQ

1.How can I place an order for L7980A through Aetrix?

Please submit a Request for Quotation (RFQ) for L7980A 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 L7980A reliable?

The price and inventory of L7980A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7980A is usually 5 days.

3.What payment methods are accepted for L7980A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7980A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L7980A?

L7980A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L7980A 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 L7980A?

For technical support, including L7980A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7980A requirements.

6.How does Aetrix verify that L7980A is sourced from the original manufacturer or authorized distributors?

All L7980A 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 L7980A meets industry standards.

7.What is the process for return or replacement of L7980A?

All L7980A units undergo pre-shipment inspection (PSI). If there is an issue with L7980A, 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 L7980A part is unused and in its original packaging.

Return procedure for L7980A:

1.Submit a request within 90 days.

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

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