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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

STMicroelectronics L4952D013TR

Name: L4952D013TR
Brand: STMicroelectronics
SKU: L4952D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L4952D013TR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: L4952D013TR.pdf

Description:: IC REG CONV CAR AUDIO 3OUT 20SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,090

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Product details

Overview

L4952D013TR from STMicroelectronics is a monolithic automotive voltage regulator in SO-20 (12+4+4) package, designed specifically for car radio power management. It delivers a fixed 8.6 V ±0.2 V output at up to 150 mA, features dual low-drop AM/FM switching outputs (OUT2/OUT3), integrated diagnostic output (DIAG), and driver circuitry for external PNP high-side switch with drop monitoring.

For engineers reviewing the L4952D013TR datasheet, L4952D013TR pinout, L4952D013TR application in car audio systems, or L4952D013TR equivalent for AM/FM supply switching and varicap biasing, this page provides verified functional context, validated pin roles, thermal and dropout specifications, and real-world substitution guidance aligned with ST's obsolete product lifecycle status.

Technical Context

The L4952 integrates four regulated outputs: OUT1 (8.6 V, 150 mA), OUT4 (10.0 V, 3 mA), plus two digitally controlled low-drop switches (OUT2/OUT3) for AM/FM circuit selection. Its BCD60II process enables high-efficiency P-channel pass transistor operation with <0.6 V dropout at full load.

It includes EN-controlled enable logic, thermal shutdown (>150 °C), short-circuit protection on OUT1, and a dedicated diagnostic comparator that asserts low on DIAG when OUT1 drops >200 mV-triggering mute in audio stages. The HSSD/HSON pins drive and monitor an external PNP high-side switch with 0.7–1.3 V drop threshold detection.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage (OUT1)	8.6 V ±0.2 V - precision bandgap-regulated rail for main audio stage supply
Max Output Current (OUT1)	150 mA - supports full-power analog audio circuitry with on-board 2 cm² heatsink (R_{th j-amb} = 60 °C/W)
Dropout Voltage (OUT1)	0.11–0.6 V - enables stable regulation down to 8.4 V input, critical during cold-crank (9.5 V min)
Diagnostic Threshold	30–200 mV output drop before DIAG asserts low - enables fast mute response to prevent speaker pop/noise
Standby Current	0–20 μA - ultra-low quiescent draw when EN = 0 V, essential for vehicle battery preservation
Supply Transient Tolerance	Up to +52 V for 400 ms - withstands ISO 7637-2 pulse 5a/b load-dump events without latch-up
OUT4 Regulator	10.0 V ±0.5 V, 3 mA - low-drop (0.14 V) bias source for varicaps and PLL op-amps

Pinout & Package

Package: SO-20 (12+4+4), surface-mount, 1.27 mm pitch, 13.0 × 7.6 mm body size, R_{th j-amb} = 60 °C/W with 2 cm² copper heatsink.

Pin/Terminal	Circuit Role	Design Meaning
VS	Main supply input	Accepts 9.5–28 V DC; tolerates 52 V transients for automotive load-dump immunity
OUT1	Main regulated output	8.6 V ±0.2 V, 150 mA max; short-circuit and thermal protected
OUT2 / OUT3	AM/FM switching outputs	Low-drop P-MOS switches; OUT2 enabled by EN2 (high-active), OUT3 by EN3 (low-active)
OUT4	Varicap/PLL bias rail	10.0 V ±0.5 V, 3 mA, ultra-low dropout (0.075 V @ 1.5 mA)
DIAG	Fault indicator output	Open-collector, sinks 10 mA; goes low when OUT1 drops >200 mV
HSSD / HSON	High-side switch driver	HSSD drives external PNP base; HSON monitors emitter-collector drop for fault detection (0.7–1.3 V threshold)
EN	Global enable input	Active-high; device enters standby (<20 μA) when pulled low
GND	Ground reference	Eight dedicated GND pins (pins 4–7, 12–15) minimize ground bounce in multi-output layout

Key Features

Feature	Design Value
Dual AM/FM supply switching	Separate EN2/EN3 control with independent low-drop paths (≤0.5 V) eliminates need for external MOSFETs
Integrated high-side switch driver	HSSD/HSON pair enables safe, monitored control of external PNP with automatic shutdown on over-drop
Automotive-grade transient protection	Withstands 52 V/400 ms pulses per ISO 7637-2 without external TVS or clamping
Diagnostic mute interface	DIAG output directly interfaces with audio amplifier mute pin to suppress speaker noise during brown-out
Varicap-optimized auxiliary regulator	OUT4 delivers stable 10 V at 3 mA with <0.15 V dropout-ideal for tuning diode bias in FM front-end

Applications

Car Radio Main Supply

AM/FM Band Selection

Use Scenario: Primary 8.6 V rail for audio preamp, IF, and microcontroller in OEM car stereo head units.

IC Role / Device Role / Timing Role: Main voltage regulator with thermal/short-circuit protection and diagnostic feedback.

Use Value: Eliminates need for discrete protection circuitry while ensuring clean, stable supply under cold-crank and load-dump conditions.

Use Scenario: Independent switching of AM and FM RF front-end circuits to reduce power consumption and crosstalk.

IC Role / Device Role / Timing Role: Dual low-drop P-MOS switch controller with separate digital enables (EN2/EN3).

Use Value: Enables zero-crossing switching between bands with <0.5 V dropout-preserving signal integrity and minimizing insertion loss.

Varicap Biasing

External High-Side Switch Control

Use Scenario: Providing precise 10 V bias to tuning diodes in FM local oscillator and RF filter networks.

IC Role / Device Role / Timing Role: Dedicated low-drop auxiliary regulator (OUT4) with 50 Ω typical output impedance.

Use Value: Maintains constant varicap capacitance across temperature and supply variation-critical for frequency stability.

Use Scenario: Driving and monitoring external PNP transistor used for antenna diversity switching or power amplification enable.

IC Role / Device Role / Timing Role: Integrated driver (HSSD) and drop-monitoring comparator (HSON) with latched fault reporting.

Use Value: Prevents PNP thermal runaway by disabling drive when V_CE exceeds 1.3 V-enabling robust, self-protecting RF power control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive voltage regulation and AM/FM switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
L4952D (same die, SO-20)	No functional difference; identical electrical specs and pinout; D013TR denotes tape-and-reel packaging	Same use cases-car radio main supply, AM/FM switching, varicap bias	Select D013TR for automated SMT assembly; D for sample or manual placement
TLE4275G	Single 5 V output (not 8.6 V); no AM/FM switches or DIAG; higher I_Q (3 mA vs. 20 μA)	Not suitable for AM/FM switching or varicap bias; limited to generic 5 V MCU/audio logic rails	Only viable if system redesign removes need for dual switching and diagnostic mute

Compared with L4952D013TR, the L4952D offers identical performance in different packaging, while the TLE4275G lacks key car radio–specific functions-making it unsuitable as a drop-in replacement without board-level changes to AM/FM control, mute logic, and bias generation.

Availability

L4952D013TR is available at Aetrix Electronics and suitable for car radio head units, automotive infotainment modules, and AM/FM tuner designs requiring stable component supply under ISO 7637-2 load-dump stress and cold-crank voltage conditions.

Supply support for L4952D013TR 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 broad manufacturing and qualification expertise.

The L4952 belongs to ST's automotive analog power regulators product line, engineered specifically for car radio subsystems requiring integrated AM/FM switching, diagnostic feedback, and varicap bias-all in a single SO-20 package.

FAQ

Is L4952D013TR still in active production?

No-L4952D013TR is marked "Obsolete Product(s)" in ST's official datasheet (Rev. 8, June 2000). It remains available through authorized legacy distributors and Aetrix Electronics' long-life inventory program with full traceability and extended lifecycle support documentation.

Can L4952D013TR replace L4952D in existing designs?

Yes-L4952D013TR and L4952D share identical die, pinout, electrical characteristics, and thermal behavior. The "013TR" suffix indicates tape-and-reel packaging for SMT placement; no schematic or layout changes are required for substitution.

What is the purpose of the eight GND pins on the SO-20 package?

The eight GND pins (pins 4–7, 12–15) provide low-inductance, low-resistance return paths for all four regulated outputs and internal logic. This minimizes ground bounce and cross-talk between AM/FM switching, main audio supply, and diagnostic signaling in high-density car radio PCB layouts.

How does the DIAG output interact with audio amplifier mute functionality?

DIAG is an open-collector output that pulls low when OUT1 drops >200 mV-indicating incipient brown-out. It connects directly to the mute pin of audio power amplifiers (e.g., TDA7388), forcing silent operation before audible pop or distortion occurs, preserving speaker integrity and user experience.

L4952D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Converter, Car Audio System

Voltage - Input:: 9.5V ~ 28V

Number of Outputs:: 3

Voltage - Output:: 8.6V

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

L4952D013TR FAQ

1.How can I place an order for L4952D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L4952D013TR 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 L4952D013TR reliable?

The price and inventory of L4952D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L4952D013TR is usually 5 days.

3.What payment methods are accepted for L4952D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L4952D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L4952D013TR?

L4952D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L4952D013TR 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 L4952D013TR?

For technical support, including L4952D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L4952D013TR requirements.

6.How does Aetrix verify that L4952D013TR is sourced from the original manufacturer or authorized distributors?

All L4952D013TR 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 L4952D013TR meets industry standards.

7.What is the process for return or replacement of L4952D013TR?

All L4952D013TR units undergo pre-shipment inspection (PSI). If there is an issue with L4952D013TR, 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 L4952D013TR part is unused and in its original packaging.

Return procedure for L4952D013TR:

1.Submit a request within 90 days.

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

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