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

STMicroelectronics L9758TR

Name: L9758TR
Brand: STMicroelectronics
SKU: L9758TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9758TR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: PowerSO-36 Exposed Top Pad

Datasheet:: L9758TR.pdf

Description:: IC REG CONV AUTO 9OUT POWERSO-36

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Product details

Overview

L9758TR from STMicroelectronics is an AEC-Q100 qualified automotive multiple-output power supply IC for engine control units, integrating a 2 A RMS buck pre-regulator, optional boost converter, five programmable LDOs (VDD5, VDDL, VCORE, VKAM, VSTBY), and four 5 V ±7 mV tracking regulators with independent reset signals (RST5, RSTL) and standby monitoring (STANDBY_OK). It supports powertrain microcontrollers requiring precise, sequenced, and fault-monitored voltage rails.

For engineers reviewing the L9758TR datasheet, L9758TR pinout, L9758TR application, or L9758TR equivalent, this device is selected for high-reliability engine control designs needing simultaneous regulation of core, I/O, memory, and sensor supplies with battery voltage thresholding (IGN), dual enable logic (PSU_EN), and controlled slew-rate power-up sequencing.

Technical Context

The L9758TR combines switch-mode (buck/boost) and linear regulation in a single PowerSO-36 package to meet stringent automotive powertrain requirements. Its buck pre-regulator delivers up to 2 A RMS at 5.5–6.1 V with 300–450 kHz switching frequency and <400 mV load regulation; the optional boost stage activates below 7.0–8.3 V battery input to sustain VB during cranking.

All five LDOs feature programmable output voltages (e.g., VDDL: 3.3 V/2.6 V; VKAM: 1 V/1.5 V; VSTBY: 3.3 V/2.6 V), tight tolerance (±2% for VDD5/VDDL/VCORE at 1 A), and dedicated feedback paths. Four tracking regulators (VSA–VSD) maintain precise ratios to selectable references (VDD5 or external TRACK_REF), each protected and rated for ±7 mV accuracy at 50 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Buck Output Current	2 A RMS - sustains pre-regulated supply under full engine ECU load without thermal derating.
VDD5 Regulation	5 V ±2% @ 1 A - powers MCU I/O domain with low dropout and 10–20 V/ms controlled slew rate.
VDDL Programmability	3.3 V or 2.6 V ±2% @ 1 A - selects I/O voltage level via VPROG3 pin for compatibility with multiple MCU families.
VCORE Regulation	Programmable via external divider & pass transistor - enables adaptive core voltage scaling for different processor operating points.
Tracking Regulators	Four 5 V ±7 mV outputs (VSA–VSD) - supplies sensors and analog front-ends requiring matched voltage references.
Reset Monitoring	Independent RST5 (VDD5) and RSTL (VDDL) open-drain outputs - provides per-rail power-good signaling to MCU reset logic.
Operating Temp Range	−40 °C to +125 °C - certified for under-hood engine control placement per AEC-Q100 Grade 0.

Pinout & Package

Package: PowerSO-36 - thermally enhanced exposed-pad surface-mount package with 36 leads, optimized for high-power automotive applications requiring low junction-to-case thermal resistance (2 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1, 6, 18, 27, 31, 32	GND / GND_S / REXT / CORE_DIS / VDDL_FDBK / VCORE_FDBK	Power ground, current-sense return, reference current setting, regulator enable/disable, and LDO feedback nodes - critical for stability, accuracy, and sequencing control.
2, 3, 4, 7, 34, 36	VBAT / VBAT_SW / BOOST / VBAT_S / VB / SW	Battery inputs, boost driver output, battery sense, preregulator output, and buck switch node - form the high-voltage switch-mode power path.
8, 9, 10, 17, 22	IGN / IGN_ON / PSU_EN / VS_DIS / STBY_OK	Ignition state detection, power mode control, sensor supply enable, and standby regulator monitor - implement vehicle-level power state management.
11–14, 23–26, 29–33	VSA–VSD / VSTBY / VKAM / VPROG1–3 / VCORE_DRV / VDDL_DRV / VDD5	Four tracking outputs, two standby regulators, three voltage programming inputs, two external pass transistor drivers, and main 5 V LDO - deliver and configure all regulated rails.
20, 21, 28	RSTL / RST5 / VPROG3	Dedicated reset outputs for VDDL and VDD5 domains, plus VDDL voltage selection - ensure deterministic MCU startup and rail integrity verification.

Key Features

Feature	Design Value
Battery-critical boost assist	Activates when VBAT_S falls below 7.0–8.3 V, sustaining VB during cold-cranking to prevent ECU brownout.
Per-rail independent reset	RST5 and RSTL provide open-collector fault signals tied directly to MCU reset inputs-no external logic required.
Configurable standby regulators	VKAM (1 V/1.5 V) and VSTBY (2.6 V/3.3 V) support low-power modes with 10 mA capability and 10% tolerance.
Tracking regulator flexibility	VSA–VSD track either VDD5 or external TRACK_REF, enabling synchronized sensor biasing across varying reference conditions.
Controlled power-up sequencing	Slew-rate limiting on VDD5, VDDL, and VCORE ensures monotonic ramp-up and avoids supply cross-coupling during startup.

Applications

Engine Control Unit (ECU)

Transmission Control Module (TCM)

Use Scenario: Real-time fuel injection and ignition timing control under wide temperature and battery voltage ranges.

IC Role / Device Role / Timing Role: Primary multi-rail power manager supplying MCU core (VCORE), I/O (VDD5/VDDL), memory (VKAM), and sensors (VSA–VSD).

Use Value: Eliminates need for discrete LDOs and tracking regulators while guaranteeing AEC-Q100 compliance and cranking resilience via integrated boost.

Use Scenario: Closed-loop gearshift actuation with torque monitoring and CAN communication.

IC Role / Device Role / Timing Role: Delivers sequenced, monitored power to transmission MCU, solenoid drivers, and analog signal conditioning circuits.

Use Value: Independent RSTL/RST5 signals enable per-supply fault isolation; STBY_OK validates standby readiness before wake-up.

Advanced Driver Assistance Systems (ADAS) Power Hub

Hybrid/EV Powertrain Gateway

Use Scenario: Centralized power distribution for radar, camera, and sensor fusion ECUs in zone architecture.

IC Role / Device Role / Timing Role: Generates matched tracking rails (VSA–VSD) for analog front-ends and programmable core/I/O voltages for heterogeneous processors.

Use Value: Four ±7 mV tracking regulators reduce component count and improve channel-to-channel matching versus discrete solutions.

Use Scenario: Interface between 12 V battery and high-voltage traction control systems requiring isolated, sequenced low-voltage rails.

IC Role / Device Role / Timing Role: Provides isolated standby (VSTBY/VKAM) and run-mode (VDD5/VDDL/VCORE) supplies with IGN/PSU_EN coordination.

Use Value: Dual enable inputs (IGN + PSU_EN) support complex vehicle power state trees including sleep, pre-wake, and active modes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail automotive power management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NCP81239MNTXG	Single-chip 3-output PMIC (2 buck + 1 LDO); no boost, no tracking regulators, no standalone standby rails.	Targeted at infotainment SoCs-not validated for AEC-Q100 Grade 0 engine control environments.	Choose only for non-powertrain applications where boost and tracking are unnecessary.
TPS65381A-Q1	Three buck converters + one LDO; includes watchdog and windowed voltage monitors but lacks programmable standby regulators (VKAM/VSTBY) and tracking outputs.	Designed for safety-critical ASIL-B MCU power; missing cranking-optimized boost and sensor-tracking capability.	Select when functional safety monitoring outweighs sensor rail synchronization needs.

Compared with NCP81239MNTXG and TPS65381A-Q1, the L9758TR uniquely integrates boost-assisted pre-regulation, four precision tracking regulators, and dual-programmable standby supplies-making it the only solution qualified for demanding engine control applications requiring simultaneous cranking resilience, sensor bias matching, and multi-domain power sequencing.

Availability

L9758TR is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and ADAS power hubs requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for L9758TR 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 specializing in automotive, industrial, and power management technologies, with broad portfolio coverage and deep automotive qualification expertise.

The L9758TR belongs to ST's automotive power management IC family, engineered specifically for high-end powertrain applications requiring integrated, AEC-Q100-compliant multi-rail regulation with cranking support and precise sequencing.

FAQ

What is the maximum allowable battery input voltage for continuous operation?

The L9758TR supports continuous operation with VBAT and VBAT_SW up to 26.5 V. Transient overvoltage up to 40 V is permitted for durations under 400 ms, covering load-dump events common in 12 V automotive systems. Absolute maximum rating is 40 V, but sustained operation above 26.5 V risks thermal overload and must be avoided in system design.

How does the boost converter activate and what external components are required?

The boost converter activates automatically when VBAT_S drops below the BoostONth threshold (7.0–8.3 V), using the BOOST pin to drive an external N-channel MOSFET. Required external components include a 22 μH inductor, 300 μF output capacitor, and 40–50 mΩ current-sense resistor (RSENSE). No enable pin or software control is needed-the function is fully autonomous.

Can VSA–VSD tracking regulators operate independently of VDD5?

Yes. VSA–VSD can track either VDD5 (when REF_SEL = LOW) or an external voltage applied to the TRACK_REF pin (when REF_SEL = HIGH). This allows sensor rails to remain stable even if VDD5 is disabled or sequenced separately, supporting flexible power domain partitioning in complex ECUs.

What is the purpose of the RST_TIM pin and how is it configured?

RST_TIM sets the duration of the internal reset timer that holds RST5 and RSTL low during power-up until all regulated outputs reach specification. It is configured by connecting an external capacitor (typically 1–10 nF) between RST_TIM and GND; larger values extend reset assertion time to accommodate slower-starting external pass transistors or heavy capacitive loads.

L9758TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: PowerSO-36 Exposed Top Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Converter, Automotive Engine Control

Voltage - Input:: 4V ~ 40V

Number of Outputs:: 9

Voltage - Output:: Programmable

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-36

L9758TR FAQ

1.How can I place an order for L9758TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9758TR 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 L9758TR reliable?

The price and inventory of L9758TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9758TR is usually 5 days.

3.What payment methods are accepted for L9758TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9758TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9758TR?

L9758TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9758TR 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 L9758TR?

For technical support, including L9758TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9758TR requirements.

6.How does Aetrix verify that L9758TR is sourced from the original manufacturer or authorized distributors?

All L9758TR 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 L9758TR meets industry standards.

7.What is the process for return or replacement of L9758TR?

All L9758TR units undergo pre-shipment inspection (PSI). If there is an issue with L9758TR, 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 L9758TR part is unused and in its original packaging.

Return procedure for L9758TR:

1.Submit a request within 90 days.

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

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