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

STMicroelectronics L4976D013TR

Name: L4976D013TR
Brand: STMicroelectronics
SKU: L4976D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L4976D013TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: L4976D013TR.pdf

Description:: IC REG BUCK ADJ 1A 16SO W

Quantity:: RFQ Add To RFQ list

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Inventory:1,307

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Product details

Overview

L4976D013TR from STMicroelectronics is a monolithic step-down switching regulator IC delivering 1 A output current with adjustable output voltage from 3.3 V to 50 V, operating from 8 V to 55 V input, featuring internal 0.25 Ω D-MOS switch, 5.1 V reference, and up to 300 kHz switching frequency-used in industrial power supplies and distributed DC-DC conversion.

For engineers reviewing the L4976D013TR datasheet, L4976D013TR pinout, L4976D013TR application, or L4976D013TR equivalent, key selection criteria include input voltage range (8–55 V), output adjustability (0.5–50 V), thermal shutdown behavior, pulse-by-pulse current limiting, and SO16W package compatibility for high-efficiency 1 A buck designs.

Technical Context

The L4976D013TR integrates a voltage-mode PWM controller with feed-forward regulation, enabling stable operation across wide input variations. Its oscillator supports external R-C programming (up to 300 kHz), and the error amplifier provides 57 dB open-loop gain with 2.5 mS transconductance for precise loop compensation.

Internal protection includes hiccup-mode short-circuit response, feedback disconnection detection, and thermal shutdown at 150 °C junction temperature. The device uses BCD mixed-signal technology to co-integrate logic, analog, and high-voltage power stages on a single die.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	1 A continuous; supports full-load operation without external boost components
Input voltage range	8 V to 55 V; enables direct use with 12 V, 24 V, and 48 V industrial bus rails
Output voltage range	Adjustable from 3.3 V to 50 V via external resistor divider; 3.3 V default when FB tied directly
Switching frequency	Up to 300 kHz; set by external R_OSC/C_OSC; higher frequencies reduce external inductor size
Reference voltage	5.1 V ±1%; 20 mA sink/source capability ensures stable feedback biasing
R_DS(ON)	0.25 Ω typical; minimizes conduction loss at 1 A, improving efficiency at medium loads
Thermal shutdown	Activates at T_J = 150 °C; hysteresis allows safe restart after cooldown

Pinout & Package

Package: SO16W (16-pin wide-body SOIC), surface-mount, ECOPACK-compliant, with thermal resistance R_thJA = 110 °C/W on standard PCB layout.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pin 2)	Power ground reference	Common return path for internal power stage and control circuitry; must be low-impedance
VREF (Pin 3)	5.1 V precision reference output	Provides stable bias for external feedback divider; capable of sourcing/sinking up to 20 mA
OSC (Pin 4)	Oscillator timing node	Connects external R-C network to set switching frequency; enables line feed-forward automatically
OUT (Pins 5,6)	Power switch output	Drives external inductor; pins are paralleled internally for 1 A current handling
VCC (Pin 11)	Unregulated input supply	Primary power source for internal circuitry; must be ≥8 V and ≤55 V
BOOT (Pin 12)	Bootstrap gate drive	Connects external capacitor to OUT to generate gate voltage >VCC for internal N-channel MOSFET
COMP (Pin 13)	Error amplifier output	Provides compensation node for external RC network to stabilize control loop
FB (Pin 14)	Feedback input	Monitors output via resistive divider; 3.3 V threshold triggers regulation; open-circuit protection active

Key Features

Feature	Design Value
Voltage feed-forward regulation	Compensates for input ripple in real time, reducing output voltage deviation during line transients
Pulse-by-pulse current limiting	Detects overcurrent every switching cycle, limiting peak inductor current to ~2.5 A before shutdown
Hiccup-mode short-circuit protection	Enters low-duty-cycle retry mode upon sustained overload, limiting average power dissipation
Zero-load quiescent current	Operates down to 2.5 mA I_q, enabling standby-ready systems without disabling regulation
Feedback disconnection protection	Shuts down output if FB pin floats or opens, preventing uncontrolled high-voltage runaway

Applications

Industrial PLC Power Supply

Automotive Body Control Module

Use Scenario: Distributed 5 V or 12 V rail generation from 24 V vehicle battery or factory 48 V DC bus.

IC Role / Device Role / Timing Role: Primary buck regulator controlling power delivery to microcontroller, CAN transceivers, and sensor interfaces.

Use Value: Wide 8–55 V input range accommodates cold-crank and load-dump transients; hiccup mode prevents thermal damage during wiring faults.

Use Scenario: Local 3.3 V or 5 V supply for MCU and peripheral ICs in body electronics modules.

IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck controller managing power sequencing and transient response.

Use Value: 5.1 V reference and 57 dB error amplifier gain ensure <±1% output accuracy across temperature; zero-load operation supports sleep-mode retention.

Telecom Remote Radio Unit

Factory Automation Sensor Hub

Use Scenario: Step-down conversion from 48 V PoE-derived or telecom rectified supply to 5.1 V for RF front-end biasing.

IC Role / Device Role / Timing Role: High-efficiency DC-DC converter with feed-forward control minimizing RF noise coupling into sensitive analog sections.

Use Value: 300 kHz max switching frequency avoids interference with LTE/5G bands; 0.25 Ω R_DS(ON) sustains >85% efficiency at 1 A load.

Use Scenario: Compact 24 V to 12 V or 5 V conversion for multi-sensor nodes in IIoT edge devices.

IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting multiple sensor voltage requirements via single BOM variant.

Use Value: External resistor divider enables field-programmable output (3.3–50 V); SO16W package allows automated SMT assembly with thermal relief pads.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2596S-ADJ	Fixed 150 kHz frequency; no feed-forward; lower max input (40 V); 3.5 A peak current limit	Suited for cost-sensitive, non-automotive applications where line transient immunity is less critical	Select when input stays below 40 V and feed-forward is unnecessary; requires larger inductor due to fixed frequency
MP2451DT-LF-Z	36 V max input; 2 A output; integrated high-side switch; 340 kHz fixed frequency; no VREF pin	Better for space-constrained designs needing higher current but narrower input range	Choose for compact 12 V–24 V systems requiring >1 A; lacks programmable reference and open-loop protection features

Compared with LM2596S-ADJ and MP2451DT-LF-Z, the L4976D013TR uniquely supports 55 V input, offers feed-forward regulation, and provides dedicated VREF and FB protection-making it optimal for ruggedized industrial and automotive power rails where reliability under transient stress is mandatory.

Availability

L4976D013TR is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, telecom remote radio units, and factory automation sensor hubs requiring stable component supply across extended temperature and voltage ranges.

Supply support for L4976D013TR 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The L4976 belongs to ST's legacy high-voltage DC-DC regulator product line, engineered for robustness in harsh environments-specifically targeting applications demanding wide-input, fault-tolerant, and thermally resilient buck conversion.

FAQ

What is the minimum output voltage achievable with the L4976D013TR?

The L4976D013TR achieves a minimum regulated output voltage of 3.3 V when the FB pin is connected directly to the output. With an external resistive divider, the output can be adjusted down to 0.5 V using the internal 5.1 V reference, though stability and load regulation degrade below 3.3 V without careful compensation design.

Does the L4976D013TR require an external bootstrap capacitor?

Yes-the BOOT pin (Pin 12) requires a ceramic capacitor (typically 10–100 nF) connected between BOOT and OUT to generate the gate drive voltage above VCC for the internal N-channel MOSFET. Omitting this capacitor prevents high-side switch operation and causes immediate regulation failure.

How does the hiccup-mode protection behave during sustained overload?

Under sustained overload or short-circuit, the L4976D013TR enters hiccup mode: it shuts down, waits ~300 ms, attempts restart, and repeats. This limits average power dissipation to safe levels-measured at <150 mW during hiccup-preventing thermal runaway while allowing automatic recovery once the fault clears.

Can the L4976D013TR operate with input voltage below 8 V?

No-the absolute minimum operating input voltage is 8 V per datasheet specifications. Below this, internal biasing fails, reference voltage collapses, and regulation ceases. Startup may occur near 7.5 V under light load, but performance is not guaranteed and thermal stress increases significantly below 8 V.

L4976D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

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):: 8V

Voltage - Input (Max):: 55V

Voltage - Output (Min/Fixed):: 0.5V

Voltage - Output (Max):: 50V

Current - Output:: 1A

Frequency - Switching:: 100kHz ~ 300kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO W

L4976D013TR FAQ

1.How can I place an order for L4976D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L4976D013TR 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 L4976D013TR reliable?

The price and inventory of L4976D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L4976D013TR is usually 5 days.

3.What payment methods are accepted for L4976D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L4976D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L4976D013TR?

L4976D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L4976D013TR 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 L4976D013TR?

For technical support, including L4976D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L4976D013TR requirements.

6.How does Aetrix verify that L4976D013TR is sourced from the original manufacturer or authorized distributors?

All L4976D013TR 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 L4976D013TR meets industry standards.

7.What is the process for return or replacement of L4976D013TR?

All L4976D013TR units undergo pre-shipment inspection (PSI). If there is an issue with L4976D013TR, 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 L4976D013TR part is unused and in its original packaging.

Return procedure for L4976D013TR:

1.Submit a request within 90 days.

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

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