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

STMicroelectronics E-L9758BBTR

Name: E-L9758BBTR
Brand: STMicroelectronics
SKU: E-L9758BBTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-L9758BBTR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 36-PowerBSSOP (0.433", 11.00mm Width)

Datasheet:: E-L9758BBTR.pdf

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

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Product details

Overview

E-L9758BBTR 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, programmable 5 V/3.3 V/2.6 V LDOs (VDD5, VDDL, VCORE), dual standby regulators (VKAM at 1 V/1.5 V, VSTBY at 3.3 V/2.6 V), and four 5 V ±7 mV tracking regulators - deployed in powertrain ECUs requiring precise sequencing and battery-voltage resilience.

For engineers reviewing the E-L9758BBTR datasheet, E-L9758BBTR pinout, E-L9758BBTR application, or E-L9758BBTR equivalent, this device supports critical voltage domain management in high-end automotive microcontroller systems with independent reset monitoring (RST5, RSTL), ignition-controlled mode transitions (IGN), and low-battery boost capability.

Technical Context

The L9758 implements a hybrid regulation architecture: a switchmode buck converter (300–450 kHz, 5.5–6.1 V output) feeds linear regulators, while an optional boost stage activates below 7 V battery input to sustain pre-regulation. Its four tracking regulators (VSA–VSD) maintain precise voltage offsets relative to selectable references (VDD5 or external TRACK_REF), enabling synchronized sensor rail delivery.

Power sequencing is hardware-controlled via dedicated pins: IGN and PSU_EN jointly determine RUN/STANDBY entry; CORE_DIS enables/disables VDDL/VCORE; RST_TIM sets reset timeout; and STBY_OK provides standalone VSTBY health monitoring - all operating across −40 °C to +125 °C with thermal shutdown at 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Buck Output Current	2 A RMS - sustains pre-regulated supply for downstream LDOs under full engine ECU load
VDD5 Output Accuracy	5 V ±2% @ 1 A - tight tolerance ensures stable MCU core logic supply during transients
VDDL Programmability	3.3 V or 2.6 V ±2% @ 1 A - configurable I/O voltage matching microcontroller interface requirements
VKAM Standby Output	1 V or 1.5 V ±10% @ 10 mA - powers SRAM retention in deep sleep with minimal quiescent draw
Tracking Regulator Precision	±7 mV @ 50 mA - maintains sub-1% tracking error across VSA–VSD for multi-sensor analog front-ends
Operating Temperature	−40 °C to +125 °C - meets AEC-Q100 Grade 0 requirements for under-hood powertrain placement
Package	PowerSO-36 - thermally enhanced exposed-pad package enabling 2 °C/W junction-to-case resistance

Pinout & Package

Delivered in PowerSO-36 package with exposed thermal pad for efficient heat dissipation in high-power automotive environments. Pin count: 36. Mounting: surface-mount. Thermal resistance: 2 °C/W (junction-to-case).

Pin/Terminal	Circuit Role	Design Meaning
1, 6, 18, 22, 31, 35	GND / GND_S / REXT / STBY_OK / VDDL_FDBK / FDBK	Ground reference, current sense return, external timing resistor node, standby monitor open-drain output, feedback inputs for linear and switching regulators
2, 3, 4, 7, 34, 36	VBAT / VBAT_SW / BOOST / VBAT_S / VB / SW	Main battery input, switched battery rail, boost predriver output, battery sense for boost enable, preregulator output, buck switch node
8, 9, 10, 17, 27	IGN / IGN_ON / PSU_EN / VS_DIS / CORE_DIS	Ignition state input, open-drain ignition status indicator, power supply enable, tracking regulator disable, VDDL/VCORE enable control
11–14, 16, 23–26, 29–33	VSA–VSD / REF_SEL / VSTBY / VKAM / VPROG1–2 / VCORE_DRV / VDDL_DRV / VDD5	Four tracking outputs, reference selection, two standby rails, two voltage programming inputs, two external pass transistor drivers, main 5 V LDO output
20–21, 30	RSTL / RST5 / VCORE_FDBK	Independent open-collector reset signals for VDDL and VDD5 domains; VCORE feedback for closed-loop regulation

Key Features

Feature	Design Value
Integrated Boost Pre-regulator	Activates below 7.0–8.3 V battery threshold to maintain ≥5.5 V preregulation during cranking - eliminates need for external boost IC
Programmable Core Voltage (VCORE)	2% accuracy at 1 A using external pass transistor and voltage divider - supports adaptive MCU core scaling without discrete regulators
Dual Independent Reset Monitoring	RST5 and RSTL provide separate undervoltage detection for VDD5 and VDDL supplies - enables selective domain reset in complex boot sequences
Four Tracking Regulators with Reference Select	VSA–VSD track either VDD5 or external TRACK_REF - allows flexible sensor biasing aligned to logic or analog reference domains
Standby Mode Control Logic	IGN and PSU_EN dual-input enable/disable - ensures deterministic transition between run and ultra-low-quiescent standby states per ISO 16750-2

Applications

Gasoline Engine Control Unit

Diesel Common Rail ECU

Use Scenario: Real-time combustion timing, injector drive, and knock sensing in turbocharged gasoline engines.

IC Role / Device Role / Timing Role: Central power manager delivering sequenced, isolated, and monitored voltage domains to MCU, CAN transceivers, and analog sensor interfaces.

Use Value: Enables simultaneous 5 V (MCU core), 3.3 V (peripherals), and 1 V (SRAM retention) rails with <7 mV tracking error - critical for ADC reference stability during transient load events.

Use Scenario: High-precision fuel injection control with pressure feedback and exhaust aftertreatment coordination.

IC Role / Device Role / Timing Role: Multi-rail regulator with boost assist sustaining VDD5 during cold-cranking (<6 V battery), while providing independent reset signaling for safety-critical subsystems.

Use Value: Maintains 5 V ±2% output down to 4 V battery input via buck+boost hybrid operation - prevents ECU brownout during start-stop cycles.

Transmission Control Module

Hybrid Powertrain Controller

Use Scenario: Gear actuation, clutch pressure control, and torque vectoring in 8-speed automatic transmissions.

IC Role / Device Role / Timing Role: Power supply with programmable VDDL (2.6 V/3.3 V) and VCORE for dual-core transmission MCU, plus four tracking rails for solenoid driver ICs.

Use Value: Four ±7 mV tracking regulators (VSA–VSD) deliver matched voltages to multiple high-side drivers - minimizing current mismatch and improving shift consistency.

Use Scenario: Coordinating ICE, e-motor, and DC-DC converters in P2/P3 hybrid architectures with strict ASIL-B compliance.

IC Role / Device Role / Timing Role: Safety-aware power manager providing redundant VDD5/VDDL monitoring (RST5/RSTL), STBY_OK validation, and thermal shutdown at 150 °C.

Use Value: Independent STBY_OK signal validates VSTBY before wake-up - prevents unsafe processor initialization during battery recovery after deep discharge.

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 5 V/3.3 V dual-output buck controller; no boost, no tracking regulators, no standby memory rail	Lacks VKAM, VSTBY, and VSA–VSD tracking - suitable only for simpler body-control modules	Select when system requires only two regulated rails and no cranking support
TPS65381A-Q1	Three integrated buck converters (3.3 V, 1.2 V, 1.0 V); no LDOs, no boost, no tracking, no standalone standby regulators	Designed for MCU core + DDR memory power only - missing sensor tracking and ignition-mode logic	Choose for infotainment SoC power where high-current digital rails dominate

Compared with NCP81239MNTXG and TPS65381A-Q1, the E-L9758BBTR uniquely integrates boost-assisted buck pre-regulation, four precision tracking regulators, dual standby rails, and ignition-aware sequencing - making it irreplaceable for high-end powertrain ECUs demanding cranking resilience and multi-domain voltage coordination.

Availability

E-L9758BBTR is available at Aetrix Electronics and suitable for gasoline engine control units, diesel common rail ECUs, transmission control modules, and hybrid powertrain controllers requiring stable component supply across extended automotive temperature and lifetime requirements.

Supply support for E-L9758BBTR 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-grade power management, microcontrollers, and sensors - with over 30 years of AEC-Q100 product validation experience.

The L9758 belongs to ST's automotive power supply IC portfolio, engineered specifically for engine and transmission control applications requiring cranking resilience, multi-rail sequencing, and functional safety-aware voltage monitoring.

FAQ

What is the purpose of the BOOST pin (Pin 4) and how is it used?

Pin 4 (BOOST) is a predriver output that drives the gate of an external N-channel MOSFET in the boost circuit. It activates when battery voltage (VBAT_S) falls below 7.0–8.3 V, enabling the boost stage to sustain preregulator input above 5.5 V. The pin delivers 200 μA source/1 mA sink capability with 50–180 ns rise time, optimized for fast-switching discrete FETs in compact layouts.

How does the L9758 handle power-up sequencing between VDD5 and VDDL?

The L9758 enforces controlled slew rates on both VDD5 and VDDL during startup: VDD5 ramps at 10–20 V/ms, while VDDL follows with a 0.5–3.1 mV offset relative to VDD5. This intentional staggered ramp prevents simultaneous inrush current peaks and ensures MCU core powers before I/O - verified by internal power-on-reset logic and independent RST5/RSTL assertion timing.

Can the tracking regulators (VSA–VSD) be disabled individually?

Yes - the VS_DIS pin (Pin 17) is a global enable/disable control for all four tracking regulators (VSA–VSD). When pulled low, all four outputs are actively enabled; when pulled high, they enter high-impedance shutdown. There is no per-regulator disable function - individual tracking rails must be managed externally if independent control is required.

What is the role of the REXT pin (Pin 18) and what value resistor is required?

Pin 18 (REXT) sets the switching frequency of both buck and boost regulators via an external resistor to ground. A 10.0 kΩ ±1% resistor yields 300–450 kHz operation. The pin senses 1.18–1.24 V internally, drawing negligible current - enabling stable frequency setting across temperature without trimming or calibration.

E-L9758BBTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerBSSOP (0.433", 11.00mm Width)

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, Bottom Pad

E-L9758BBTR FAQ

1.How can I place an order for E-L9758BBTR through Aetrix?

Please submit a Request for Quotation (RFQ) for E-L9758BBTR 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 E-L9758BBTR reliable?

The price and inventory of E-L9758BBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L9758BBTR is usually 5 days.

3.What payment methods are accepted for E-L9758BBTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L9758BBTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-L9758BBTR?

E-L9758BBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-L9758BBTR 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 E-L9758BBTR?

For technical support, including E-L9758BBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L9758BBTR requirements.

6.How does Aetrix verify that E-L9758BBTR is sourced from the original manufacturer or authorized distributors?

All E-L9758BBTR 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 E-L9758BBTR meets industry standards.

7.What is the process for return or replacement of E-L9758BBTR?

All E-L9758BBTR units undergo pre-shipment inspection (PSI). If there is an issue with E-L9758BBTR, 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 E-L9758BBTR part is unused and in its original packaging.

Return procedure for E-L9758BBTR:

1.Submit a request within 90 days.

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

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