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

STMicroelectronics A5972D013TR

Name: A5972D013TR
Brand: STMicroelectronics
SKU: A5972D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A5972D013TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: A5972D013TR.pdf

Description:: IC REG BUCK ADJ 1.5A 8SOIC

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Product details

Overview

A5972D013TR from STMicroelectronics is a monolithic step-down (buck) switching regulator IC designed for automotive power systems, featuring an internal P-channel DMOS switch (R_DS(on) = 250 mΩ typ), 1.5 A DC output current capability, 4–36 V input voltage range, and fixed 250 kHz switching frequency. It operates down to 4 V input-enabling cold-crank compatibility-and supports adjustable output voltages from 1.235 V to V_IN, with ±2% reference accuracy and zero-load burst-mode operation.

For engineers reviewing the A5972D013TR datasheet, A5972D013TR pinout, A5972D013TR application, or A5972D013TR equivalent, key selection criteria include its AEC-Q100 qualification, internal current limiting (1.8–3 A min/max), thermal shutdown at 150 °C ±10 °C, feedback disconnection protection, and SO-8 package suitability for space-constrained automotive PCBs.

Technical Context

The A5972D013TR integrates a transconductance error amplifier (G_m = 2.3 mS, gain = 65 dB), voltage feedforward PWM comparator, and pulse-by-pulse current limiting with frequency foldback-enabling robust short-circuit protection without external sensing. Its internal oscillator fixes f_SW at 250 kHz ±15%, while the high-side P-MOS driver eliminates bootstrap capacitor requirements.

Functional blocks include UVLO hysteresis on V_CC, dedicated inhibit pin for zero-quiescent-current shutdown, and dual overvoltage protection: one via feedback disconnection detection and another via OVP comparator (trip threshold = 1.3 × V_FB). The device maintains regulation across –40 °C to +125 °C junction temperature, with thermal shutdown disabling switching above +150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4 V to 36 V - supports full automotive battery range including cold-crank (4 V) and load-dump transients (up to 40 V absolute max).
Output Current	Up to 1.5 A DC - limited by internal 1.8 A min switch current limit and thermal design; actual delivery depends on layout and heatsinking.
Switching Frequency	250 kHz fixed - enables predictable EMI filtering and compact magnetics; tolerance ±15% includes voltage feedforward compensation.
Reference Voltage	1.235 V ±2% - sets output voltage via external resistor divider; defines regulation accuracy and line/load transient response baseline.
R_DS(on)	250 mΩ typical - internal P-channel DMOS reduces external component count and improves efficiency at medium loads.
Quiescent Current	2.5 mA (inhibit active) / 3–5 mA (operating) - enables low-power standby modes and meets automotive idle-current budgets.
Thermal Shutdown	150 °C ±10 °C - protects silicon during overload or poor thermal management; 20 °C hysteresis prevents oscillation near trip point.

Pinout & Package

Package: SO-8 (Small Outline, 8-pin, surface-mount), thermally enhanced with exposed pad (not electrically connected per datasheet); footprint compliant with JEDEC MS-012AC.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Power output node	Switched output of internal P-MOS; connects directly to LC filter inductor; carries peak-to-peak ripple current.
2,3,6,7 (GND)	Ground reference	Four dedicated ground pins minimize ground bounce and improve thermal conduction; must be tied to common PCB ground plane.
4 (COMP)	Error amplifier output	Connects to external RC/CC compensation network; open-loop transconductance = 2.3 mS; swing = 0.4–3.65 V.
5 (FB)	Feedback input	Senses output voltage via resistive divider; internal reference = 1.235 V; floating FB disables regulator to prevent overvoltage.
8 (V_CC)	Unregulated input supply	Primary power rail for internal circuitry; must be bypassed with ≥1 µF ceramic capacitor close to pin.

Key Features

Feature	Design Value
AEC-Q100 qualified	Qualified for automotive Grade 1 (–40 °C to +125 °C ambient), including PPAP documentation support and stress testing.
Voltage feedforward PWM	Compensates for input voltage variation in real time, maintaining constant PWM gain and improving line regulation/transient response.
Zero-load burst mode	Operates without external bias supply or bootstrap capacitor; enters randomized burst mode below ~10 mA load to maintain regulation.
Feedback disconnection protection	Automatically disables switching if FB pin floats-prevents uncontrolled output voltage rise and potential load damage.
Pulse-by-pulse + frequency foldback current limit	Combines cycle-by-cycle overcurrent cutoff with dynamic frequency reduction to sustain safe inductor current under sustained short-circuit.

Applications

Body Control Module (BCM)

Infotainment Power Supply

Use Scenario: Regulating 12 V battery to 5 V/3.3 V for microcontrollers, CAN transceivers, and sensors in door modules and lighting controllers.

IC Role / Device Role / Timing Role: Primary buck converter delivering stable, low-noise DC power; handles cold-crank dips and load-dump spikes.

Use Value: AEC-Q100 qualification ensures reliability across vehicle lifetime; 4 V minimum input guarantees operation during engine start.

Use Scenario: Powering display logic, audio codecs, and USB peripherals in head units and digital clusters.

IC Role / Device Role / Timing Role: Intermediate voltage regulator stepping down 12 V to 5 V or 3.3 V; manages variable load transients from touchscreens and Bluetooth stacks.

Use Value: 250 kHz fixed frequency simplifies EMI filter design; burst mode extends battery life during display-off states.

ADAS Camera Power

Engine Control Unit (ECU) Auxiliary Rail

Use Scenario: Providing clean, regulated 3.3 V for image sensor interfaces and ISP processors in rear-view or surround-view cameras.

IC Role / Device Role / Timing Role: Low-noise buck regulator with tight reference tolerance (±2%) to ensure ADC and PLL stability.

Use Value: Internal 1.235 V reference and compensation-ready COMP pin enable precise output setting and loop stability with minimal external parts.

Use Scenario: Generating auxiliary 5 V rail for non-critical ECU subsystems (e.g., diagnostics, memory backup, LIN transceivers).

IC Role / Device Role / Timing Role: Secondary regulator isolated from main 5 V domain; provides fault-isolated power with independent thermal shutdown.

Use Value: Inhibit pin allows centralized power sequencing; thermal shutdown at 150 °C prevents cascade failure during ECU overheating events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2678SD-5.0/NOPB	Fixed 5 V output; no adjustable feedback; 5.5–40 V input; 5 A rating; requires external MOSFET.	Not suitable for adjustable outputs or cold-crank (min 5.5 V); higher current but less integration.	Select only when fixed 5 V output and higher current are required, and board space allows external FET + driver.
TPS54331DR	3 A rating; 3.5–28 V input; adjustable output; 570 kHz switching; no AEC-Q100 qualification.	Lacks automotive qualification; higher f_SW increases EMI filtering complexity; unsuitable for safety-critical modules.	Consider for non-automotive industrial or consumer designs requiring higher current and faster transient response.

Compared with LM2678SD-5.0/NOPB and TPS54331DR, the A5972D013TR offers integrated P-MOS, AEC-Q100 compliance, cold-crank capability (4 V), and feedback disconnection protection-making it uniquely suited for cost-sensitive, space-constrained automotive body electronics where reliability and qualification are mandatory.

Availability

A5972D013TR is available at Aetrix Electronics and suitable for automotive body control modules, infotainment systems, ADAS camera power supplies, and engine control unit auxiliary rails requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for A5972D013TR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad automotive qualification expertise.

The A5972D belongs to ST's automotive-grade monolithic DC-DC regulator product line, engineered specifically for harsh-environment vehicle subsystems requiring high reliability, wide input range, and integrated protection features without external complexity.

FAQ

What is the maximum allowable input voltage for continuous operation?

The A5972D013TR supports continuous operation up to 36 V input, with absolute maximum rating of 40 V for transient conditions such as load dump. Operation beyond 36 V risks exceeding thermal limits and triggering shutdown, even if within absolute max ratings. Designers must ensure input filtering and clamping meet ISO 7637-2 Pulse 5a requirements.

Does the A5972D013TR require an external bootstrap capacitor?

No. Because it uses an internal high-side P-channel MOSFET, the A5972D013TR eliminates the need for a bootstrap capacitor-unlike N-channel high-side buck controllers. This simplifies layout, reduces BOM count, and enables reliable zero-load operation in burst mode without auxiliary winding or charge pump.

How does the feedback disconnection protection work?

When the FB pin is left floating or disconnected, the internal circuit detects absence of voltage divider bias and forces the regulator into shutdown mode-preventing uncontrolled duty cycle increase and output voltage runaway. This behavior is hardware-based and functions independently of software or external supervision, meeting ASIL-B functional safety expectations for basic protection.

Can the A5972D013TR be used in synchronous rectification configurations?

No. The A5972D013TR uses an internal P-channel MOSFET for the high-side switch and relies on an external Schottky diode for freewheeling. It does not support synchronous rectification-no gate drive or timing signals are provided for an external low-side MOSFET. Efficiency optimization requires careful diode selection (low V_F, fast recovery) and PCB thermal design.

A5972D013TR 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):: 4V

Voltage - Input (Max):: 36V

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

Voltage - Output (Max):: 36V

Current - Output:: 1.5A

Frequency - Switching:: 250kHz

Synchronous Rectifier:: No

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

A5972D013TR FAQ

1.How can I place an order for A5972D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for A5972D013TR 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 A5972D013TR reliable?

The price and inventory of A5972D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5972D013TR is usually 5 days.

3.What payment methods are accepted for A5972D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5972D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A5972D013TR?

A5972D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A5972D013TR 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 A5972D013TR?

For technical support, including A5972D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5972D013TR requirements.

6.How does Aetrix verify that A5972D013TR is sourced from the original manufacturer or authorized distributors?

All A5972D013TR 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 A5972D013TR meets industry standards.

7.What is the process for return or replacement of A5972D013TR?

All A5972D013TR units undergo pre-shipment inspection (PSI). If there is an issue with A5972D013TR, 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 A5972D013TR part is unused and in its original packaging.

Return procedure for A5972D013TR:

1.Submit a request within 90 days.

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

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