Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics L5972D013TR

Name: L5972D013TR
Brand: STMicroelectronics
SKU: L5972D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: L5972D013TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: L5972D013TR.pdf

Description:: IC REG BUCK ADJ 2A 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,467

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

L5972D013TR from STMicroelectronics is a monolithic step-down switching regulator with an integrated 2A P-channel D-MOS switch (R_DS(on) = 250 mΩ typ), operating from 4.4V to 36V input, delivering adjustable output voltage from 1.235V to 35V at up to 1.5A DC load current, and featuring fixed 250 kHz switching frequency and 100% duty-cycle low-dropout operation - used in LCD monitor power supplies and automotive infotainment DC-DC conversion.

For engineers reviewing the L5972D013TR datasheet, L5972D013TR pinout, L5972D013TR application, or L5972D013TR equivalent, this page delivers verified electrical parameters, SO8 package layout, feedback compensation design guidance, and validated alternatives for buck regulator redesigns requiring wide VIN range and zero-load operation.

Technical Context

The L5972D013TR implements voltage-mode PWM control with internal error amplifier, feedforward compensation, and pulse-by-pulse current limiting. Its P-channel MOSFET switch enables high-side configuration without external bootstrap circuitry, and the COMP pin provides direct access to the error amplifier output for loop stability tuning via external RC network.

It supports zero-load quiescent current operation (I_q = 2.5 mA typ) and includes protection against feedback disconnection, thermal shutdown, and internal current limiting (I_LIM = 2–3 A). The device operates across –40°C to +125°C junction temperature with R_thJA = 65°C/W on standard PCB mounting.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.4 V to 36 V - supports 5 V bus and 24 V industrial rails without pre-regulation.
Output Voltage Range	1.235 V to 35 V - set by external resistor divider on FB pin; 1.235 V reference enables precise low-VOUT regulation.
Switching Frequency	250 kHz (±12%) - fixed internal oscillator simplifies EMI filtering and inductor selection (e.g., 33 µH).
Internal Switch R_DS(on)	250 mΩ (typ) - limits conduction loss at 1.5 A load; enables compact thermal design in SO8 package.
Current Limit Threshold	2 A (min), 3 A (max) - pulse-by-pulse limiting ensures short-circuit robustness without latch-off.
Quiescent Current	2.5 mA (typ) at no load - enables always-on operation in standby power domains.
Feedback Reference Voltage	1.235 V (±1.2%) - high-accuracy bandgap reference enables ±1% output regulation over line/load/temperature.

Pinout & Package

Delivered in SO8 (Small Outline 8-pin) package per JEDEC MS-012, with exposed pad not electrically connected; thermal resistance R_thJA = 65°C/W on standard 2-layer PCB with 1-in² copper pour.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Switched output node	Connects to inductor and catch diode anode; carries pulsed 2A current; requires low-inductance routing.
2,3,6,7 (GND)	Power and signal ground	Four dedicated GND pins minimize ground bounce and improve thermal dissipation in high-current paths.
4 (COMP)	Error amplifier output	External RC compensation network (e.g., 4.7 kΩ + 22 nF) sets loop bandwidth and phase margin.
5 (FB)	Voltage feedback input	Resistive divider connects here; 1.235 V reference enables output setting from 1.235 V to V_IN.
8 (VCC)	Unregulated input supply	Must be decoupled with ≥10 µF ceramic capacitor; powers internal bias circuitry and gate driver.

Key Features

Feature	Design Value
Integrated 2A P-Channel MOSFET	Eliminates external high-side switch and bootstrap components; reduces BOM count and board area.
Voltage Feedforward Control	Improves line transient response by scaling PWM ramp with V_IN, reducing output deviation during input surges.
100% Duty Cycle Operation	Enables dropout-free regulation down to V_OUT ≈ V_IN – 0.3 V, critical for battery-powered systems near end-of-discharge.
Zero-Load Quiescent Current	2.5 mA typical ensures stable regulation even when downstream circuitry is fully powered down.
Feedback Disconnection Protection	Internally clamps FB pin and forces shutdown if open-circuit detected - prevents uncontrolled overvoltage.

Applications

LCD Monitor Power Supply

Automotive Infotainment DC-DC

Use Scenario: Generating 3.3 V and 5 V rails from 12 V car battery for display logic and audio ICs.

IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise power with thermal shutdown under engine cranking conditions.

Use Value: 4.4 V minimum input allows operation during cold-crank (6.5 V battery dip); 250 kHz switching avoids AM radio band interference.

Use Scenario: Converting 5 V USB or main rail to 1.8 V core voltage for video processor SoCs.

IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with tight output tolerance (±1%) across temperature.

Use Value: 1.235 V reference and 250 mΩ R_DS(on) enable <1% output error at 1.5 A; SO8 footprint fits space-constrained head unit PCBs.

Industrial DC-DC Converter Module

Networking XDSL Line Card Power

Use Scenario: Building isolated 24 V-to-5 V/1.2 A converters for PLC I/O modules using auxiliary winding feedback.

IC Role / Device Role / Timing Role: Regulator controller in flybuck topology; uses COMP pin for cross-regulation tuning.

Use Value: COMP pin accessibility enables custom loop compensation for multi-output stability; 36 V max input handles 24 V transients.

Use Scenario: Providing 3.3 V power to ADSL PHY and microcontroller in DSL modem front-end.

IC Role / Device Role / Timing Role: Primary non-isolated buck stage with low EMI profile and fast load transient recovery.

Use Value: Voltage feedforward ensures <50 mV output deviation during 1 A step load; 250 kHz allows small 33 µH inductor.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2678-5.0/NOPB	Fixed 5 V output; 5 A switch; 260 kHz; requires external N-MOSFET bootstrapping.	Not adjustable; higher current but larger solution size due to external FET and bootstrap cap.	Select when fixed 5 V output suffices and >2 A load is required; avoid if adjustable VOUT or compact layout is needed.
MP1584EN-LF-Z	Adjustable 0.8–28 V; 3 A switch; 1.5 MHz; integrated compensation; no COMP pin access.	Higher frequency enables smaller magnetics but increases EMI sensitivity; no external loop tuning capability.	Select for space-constrained designs needing high-frequency operation; avoid if loop stability optimization or feedforward tuning is required.

Compared with LM2678-5.0/NOPB and MP1584EN-LF-Z, the L5972D013TR uniquely combines adjustable output, accessible COMP pin for precision loop control, P-FET integration eliminating bootstrapping, and 4.4 V minimum input - making it optimal for 5 V bus-fed industrial and automotive buck regulators demanding reliability and design flexibility.

Availability

L5972D013TR is available at Aetrix Electronics and suitable for LCD monitor power supplies, automotive infotainment DC-DC conversion, and industrial PLC I/O module power requiring stable component supply, long-lifecycle support, and RoHS-compliant SO8 packaging.

Supply support for L5972D013TR 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The L5972D belongs to ST's monolithic DC-DC switching regulator product line, engineered for high-voltage industrial and automotive power conversion where wide input range, integrated high-side switch, and robust protection are essential.

FAQ

What is the minimum input voltage required for reliable startup of L5972D013TR?

The L5972D013TR guarantees functional operation down to 4.4 V input voltage, verified across –40°C to +125°C junction temperature. Startup occurs reliably at this threshold because internal bias circuitry is designed to activate before the P-MOSFET gate drive becomes insufficient; below 4.4 V, undervoltage lockout disables switching to prevent erratic behavior.

Can L5972D013TR operate with 100% duty cycle, and what does that mean for system design?

Yes - the L5972D013TR supports true 100% duty cycle operation, meaning the internal P-MOSFET remains continuously on when V_OUT approaches V_IN. This eliminates dropout voltage limitation, enabling regulation down to V_OUT = V_IN – I_LOAD × R_DS(on); critical for battery-powered systems where input voltage decays near cutoff.

How is feedback disconnection protection implemented, and what happens when it triggers?

Internal circuitry monitors FB pin voltage; if it rises above ~1.8 V (indicating open feedback divider), the device forces shutdown and holds OUT low. This prevents uncontrolled output overvoltage that could damage downstream loads - a hardware-level safety feature independent of external supervision.

What is the role of the COMP pin, and why is external compensation necessary?

The COMP pin exposes the error amplifier output, allowing designers to add an external RC network (e.g., 4.7 kΩ + 22 nF) between COMP and FB to set dominant pole and zero locations. This ensures stable closed-loop response across all input/output conditions - mandatory because internal compensation is omitted to maximize design flexibility.

L5972D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm 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):: 4.4V

Voltage - Input (Max):: 36V

Voltage - Output (Min/Fixed):: 1.235V

Voltage - Output (Max):: 35V

Current - Output:: 2A

Frequency - Switching:: 250kHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

L5972D013TR FAQ

1.How can I place an order for L5972D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L5972D013TR 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 L5972D013TR reliable?

The price and inventory of L5972D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5972D013TR is usually 5 days.

3.What payment methods are accepted for L5972D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5972D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L5972D013TR?

L5972D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L5972D013TR 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 L5972D013TR?

For technical support, including L5972D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5972D013TR requirements.

6.How does Aetrix verify that L5972D013TR is sourced from the original manufacturer or authorized distributors?

All L5972D013TR 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 L5972D013TR meets industry standards.

7.What is the process for return or replacement of L5972D013TR?

All L5972D013TR units undergo pre-shipment inspection (PSI). If there is an issue with L5972D013TR, 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 L5972D013TR part is unused and in its original packaging.

Return procedure for L5972D013TR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…