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

STMicroelectronics L9758

Name: L9758
Brand: STMicroelectronics
SKU: L9758
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9758

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: PowerSO-36 Exposed Top Pad

Datasheet:: L9758.pdf

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

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Inventory:1,317

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Product details

Overview

L9758 from STMicroelectronics is an AEC-Q100 qualified automotive multiple-output power supply IC for engine control units, integrating a 2 A buck pre-regulator, optional boost converter, five programmable LDOs (VDD5, VDDL, VCORE, VKAM, VSTBY), and four 5 V ±7 mV tracking regulators - all operating across –40 °C to +125 °C in PowerSO-36 package.

For engineers reviewing the L9758 datasheet, L9758 pinout, L9758 application, or L9758 equivalent, this device supports critical power sequencing, low-battery boost operation, independent reset monitoring (RST5/RSTL), standby voltage supervision (STANDBY_OK), and programmable core/memory rail voltages in high-reliability powertrain systems.

Technical Context

The L9758 implements a hybrid regulation architecture: a synchronous buck converter (300–450 kHz, up to 2 A RMS) feeds linear regulators and enables low-dropout operation under wide input (4–26.5 V); an optional boost stage activates below 7 V battery threshold to sustain pre-regulation during cranking.

It delivers precise, slew-controlled power-up sequences for VDD5, VDDL, and VCORE with independent reset assertion (RST5, RSTL) and standby monitoring (STBY_OK), while four tracking regulators (VSA–VSD) maintain fixed offsets relative to selectable references (VDD5 or external TRACK_REF), supporting multi-rail sensor/actuator interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Buck output current	2 A RMS minimum - sustains pre-regulated supply for downstream LDOs and microcontroller rails under full load.
VDD5 output	5 V ±2% @ 1 A - low-dropout regulator with 10–20 V/ms controlled slew rate and ±25 mV line/load regulation.
VDDL programmability	3.3 V or 2.6 V ±2% @ 1 A - selected via VPROG3 pin; requires external pass transistor and feedback divider.
VKAM/VSTBY outputs	1 V/1.5 V ±10% @ 10 mA (VKAM); 3.3 V/2.6 V ±10% @ 10 mA (VSTBY) - dedicated low-current standby memory and auxiliary rails.
Tracking regulators	Four 5 V ±7 mV @ 50 mA (VSA–VSD) - one with selectable reference (VDD5 or external TRACK_REF) for sensor biasing.
Operating temperature	–40 °C to +125 °C - qualified per AEC-Q100 Grade 0 for under-hood engine control applications.
Package	PowerSO-36 - thermally enhanced exposed-pad SO package with R_th(j-case) = 2 °C/W for high-power dissipation.

Pinout & Package

Package: PowerSO-36 (exposed thermal pad), RoHS-compliant, rated for 150 °C max junction temperature and 2 °C/W junction-to-case thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
1, 6, 17, 22, 31, 33	GND / Ground reference	Dedicated ground pins for analog, digital, and power domains - ensure low-noise LDO regulation and accurate sensing.
2, 3, 4, 34, 36	Battery & switching nodes	VBAT (main battery), VBAT_SW (switched battery), BOOST (boost gate driver), VB (buck output), SW (buck switch node).
8, 9, 10, 18, 19, 27	Control inputs	IGN/PSU_EN (mode selection), REXT (frequency setting), RST_TIM (reset timeout), CORE_DIS (VCORE/VDDL enable).
11–14, 23–26, 28–32	Regulator I/O	VSA–VSD (tracking outputs), VSTBY/VKAM (standby rails), VPROG1–3 (voltage selection), VCORE_FDBK/VDDL_FDBK (feedback).
20, 21, 22	Reset & status outputs	RSTL (VDDL fault), RST5 (VDD5 fault), STBY_OK (VSTBY valid) - open-drain signals for system-level fault handling.

Key Features

Feature	Design Value
Integrated buck + optional boost	Enables stable pre-regulation down to 4 V battery - eliminates need for external boost IC during cold-crank conditions.
Programmable VCORE with external pass transistor	Supports microcontroller core voltage scaling (e.g., 1.2 V, 1.5 V) using external FET and resistor divider - reduces board space vs discrete solutions.
Independent RST5 and RSTL signals	Allows separate reset assertion for safety-critical VDD5 and functional VDDL rails - meets ASIL-B power domain isolation requirements.
Four precision tracking regulators	Maintain fixed offset from VDD5 or external reference - simplifies sensor excitation and ADC reference design in multi-sensor ECU modules.
Slew-controlled power-up	Configurable dV/dt on VDD5, VDDL, VCORE prevents inrush-induced brownout - ensures deterministic boot sequence for automotive MCUs.

Applications

Engine Control Unit (ECU)

Transmission Control Module (TCM)

Use Scenario: Real-time fuel injection and ignition timing control under wide battery voltage range (4–16 V), including cranking transients.

IC Role / Device Role / Timing Role: Primary power management IC delivering sequenced, monitored, and regulated supplies to MCU, CAN transceivers, and analog front-ends.

Use Value: Boost capability maintains VDD5 stability during 4.5 V cranking dips; independent RST5 ensures safe MCU reset without affecting VDDL-powered peripherals.

Use Scenario: High-integrity gear-shifting logic requiring dual-voltage rails (5 V for logic, 3.3 V for communication) and standby memory retention.

IC Role / Device Role / Timing Role: Central power sequencer providing VDD5, VDDL, VKAM, and VSTBY with synchronized startup and fault reporting.

Use Value: Programmable VKAM (1 V/1.5 V) powers SRAM retention during sleep; STBY_OK signal validates VSTBY before wake-up interrupt processing.

Electronic Throttle Control (ETC)

Advanced Driver Assistance System (ADAS) Power Hub

Use Scenario: Dual-redundant motor control with position sensing, requiring isolated, tracked 5 V supplies for Hall sensors and MCU I/O.

IC Role / Device Role / Timing Role: Source of four matched 5 V ±7 mV tracking regulators (VSA–VSD) referenced to common VDD5 or external precision reference.

Use Value: Tracking accuracy minimizes sensor offset drift; VS_DIS pin allows dynamic disabling of unused sensor rails to reduce quiescent current.

Use Scenario: Consolidated power delivery for radar, camera, and domain controller subsystems sharing a single ECU board.

IC Role / Device Role / Timing Role: Multi-rail regulator supplying VDD5 (domain controller), VDDL (CAN FD interface), VCORE (application processor), and VSTBY (always-on watchdog).

Use Value: External VCORE pass transistor enables scalable core voltage (e.g., 1.1 V @ 2 A) without changing IC; IGN/PSU_EN inputs support vehicle-level sleep/wake coordination.

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
NCP81239	Single-chip 3-phase buck controller + integrated LDOs; no boost stage; supports only 1.8–5.5 V input.	Lacks low-battery boost and standalone tracking regulators - unsuitable for cranking-tolerant engine control.	Select when input stays >6 V and system uses external boost or accepts reduced cranking margin.
TPS65381A-Q1	Three buck + three LDOs; includes watchdog and window comparator; no tracking regulators or boost.	Offers enhanced safety features (BIST, fault logging) but omits VSA–VSD tracking - limits sensor biasing flexibility.	Prefer for ASIL-D systems needing diagnostic coverage over multi-sensor tracking precision.

Compared with NCP81239 and TPS65381A-Q1, the L9758 uniquely combines cranking-tolerant boost, four precision tracking regulators, and programmable core/standby rails - making it optimal for high-end powertrain ECUs where sensor accuracy and cold-crank robustness are non-negotiable.

Availability

L9758 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, electronic throttle controllers, and ADAS power hubs requiring stable component supply across automotive production lifecycles.

Supply support for L9758 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 AEC-Q100 portfolio coverage.

The L9758 belongs to ST's automotive power management product line, engineered specifically for high-reliability engine and transmission control applications demanding cranking resilience, multi-rail sequencing, and functional safety-aware power delivery.

FAQ

What is the purpose of the BOOST pin and when does the boost converter activate?

The BOOST pin drives the gate of an external N-channel MOSFET in the boost circuit. The boost converter activates automatically when the sensed battery voltage (VBAT_S) falls below 7.0–8.3 V and deactivates above that threshold with 0.05–0.9 V hysteresis - ensuring continuous pre-regulation during engine cranking events down to ~4 V.

How is VCORE voltage programmed, and what external components are required?

VCORE voltage is set via an external resistor divider on VCORE_FDBK and driven by the VCORE_DRV predriver output. The IC supports 1 V or 1.5 V ±2% @ 1 A using an external pass transistor; no internal pass element exists - enabling thermal separation and scalable current handling beyond monolithic LDO limits.

Can the four tracking regulators (VSA–VSD) operate with different reference sources simultaneously?

No - all four tracking regulators share the same reference source, selected globally via the REF_SEL pin: low selects VDD5, high selects the external TRACK_REF input. This ensures consistent offset tracking across all four outputs but prohibits mixed-reference operation within a single device.

What thermal management provisions does the L9758 include, and how is junction temperature monitored?

The L9758 integrates thermal shutdown protection triggering at 150 °C junction temperature, with automatic recovery after cooldown. It does not provide real-time junction temperature readback; instead, thermal performance relies on PowerSO-36's 2 °C/W R_th(j-case) and proper PCB copper pour under the exposed pad - requiring ≥400 mm² of 2-oz copper for full 2 A operation at 125 °C ambient.

L9758 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: PowerSO-36 Exposed Top Pad

Packaging:: Tube

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

L9758 FAQ

1.How can I place an order for L9758 through Aetrix?

Please submit a Request for Quotation (RFQ) for L9758 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 L9758 reliable?

The price and inventory of L9758 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9758 is usually 5 days.

3.What payment methods are accepted for L9758?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9758 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9758?

L9758 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9758 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 L9758?

For technical support, including L9758 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9758 requirements.

6.How does Aetrix verify that L9758 is sourced from the original manufacturer or authorized distributors?

All L9758 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 L9758 meets industry standards.

7.What is the process for return or replacement of L9758?

All L9758 units undergo pre-shipment inspection (PSI). If there is an issue with L9758, 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 L9758 part is unused and in its original packaging.

Return procedure for L9758:

1.Submit a request within 90 days.

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

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