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

STMicroelectronics L5958SM

Name: L5958SM
Brand: STMicroelectronics
SKU: L5958SM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L5958SM

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 27-Flexiwatt, Formed Leads

Datasheet:: L5958SM.pdf

Description:: IC REG CONV CAR 4OUT 27FLEXIWATT

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Product details

Overview

L5958SM from STMicroelectronics is a multifunction automotive voltage regulator IC for car radio systems, integrating six linear regulators (8.5 V/200 mA, 5.0 V/300 mA, dual 3.3 V and dual 1.8 V outputs), a 2 A high-side power switch, dual reset buffers (VDD core and standby), battery audio/CAN warning comparators, ignition detection, load dump protection, and thermal/overcurrent protection. It operates down to 4.5 V input and supports backup capacitor interfaces for supply continuity during battery disconnection.

For engineers reviewing the L5958SM datasheet, L5958SM pinout, L5958SM application, or L5958SM equivalent, this device serves as a system power management solution for infotainment head units requiring multiple regulated rails, fault monitoring, and automotive-grade transient resilience - especially where VIN1/VIN2 dual-supply architecture, quasi-zero-standby current, and programmable battery warning thresholds are critical.

Technical Context

The L5958SM implements a dual-supply architecture: VIN1 powers Reg1 (8.5 V), Reg2 (5 V), Reg5 (3.3 V standby), Reg6 (1.8 V standby), and the SW driver; VIN2 powers Reg3 (3.3 V switched) and Reg4 (1.8 V switched). It features two independent reset chains - one monitoring standby outputs (REG5/REG6) and another monitoring switched outputs (REG3/REG4) - each with dedicated threshold hysteresis and CRES delay capacitance support.

Its battery warning subsystem includes two open-drain comparators: Hold CAN (thresholds programmable from 5–6 V low / 17–20 V high) and Hold Audio (7.8–9.2 V low / 15.2–17.8 V high), both referenced to an internal 1.2565 V bandgap. The ignition buffer provides hysteresis-controlled ON/OFF detection (1.03–1.28 V threshold) with fast rise/fall times (<10 µs) for engine start/stop signaling.

Key Specifications

Parameter	Value and Actual Design Meaning
Regulator Outputs	Six independent rails: 8.5 V/200 mA, 5.0 V/300 mA, 3.3 V/250 mA (switched), 1.8 V/350 mA (switched), 3.3 V/100 mA (standby), 1.8 V/100 mA (standby)
Power Switch	2 A high-side driver with 0.5 V max drop at 1.8 A DC; peak current up to 3.5 A for <10 ms
Reset Functions	Dual open-drain reset: RES (for REG5/REG6) with 3.15 V typ threshold and 42 ms typ delay (CRES = 47 nF); VDDCORE (for REG3/REG4) with same threshold structure
Battery Warning	Two programmable comparators: Hold CAN (5–6 V low / 17–20 V high) and Hold Audio (7.8–9.2 V low / 15.2–17.8 V high), both using internal 1.2565 V reference
Operating Range	VIN1: 9–18 V (operating), VIN2: 4.5–18 V (operating); absolute max supply: 30 V DC, 50 V transient
Quiescent Current	4–10 µA at 25 °C with all permanent regulators off; 50–100 µA with permanent regulators on
Thermal Protection	Thermal shutdown active; junction-to-case thermal resistance ≤1.0 °C/W

Pinout & Package

Package: Flexiwatt27 (SMD), 27-pin vertical-mount surface-mount package with exposed thermal tab (TAB, Pin 1), RoHS-compliant ECOPACK® construction.

Pin/Terminal	Circuit Role	Design Meaning
TAB (Pin 1)	Thermal pad / GND connection	Primary heat dissipation path; must be soldered to PCB copper pour for thermal compliance
REG6(1P8P) (Pin 2)	1.8 V standby regulator output	Supplies always-on logic (e.g., real-time clock, CAN wake-up circuitry) at ≤100 mA
RES (Pin 3)	Open-drain reset output (standby rail monitor)	Asserts low when REG5 or REG6 falls below threshold; requires external pull-up
BU1 (Pin 4)	Backup capacitor interface (standby rails)	Connects to capacitor sustaining REG5/REG6 during sudden battery removal
CRES (Pin 5)	Reset delay capacitor terminal	Controls RES assertion timing (e.g., 42 ms typical with 47 nF)
REG5(3P3P) (Pin 6)	3.3 V standby regulator output	Feeds low-power MCU peripherals in sleep mode; quasi-zero current when disabled
GND (Pin 7)	Power ground reference	Common return for all regulators and switch; separate from TAB but electrically tied internally
SW (Pin 8)	High-side power switch output	Drives loads (e.g., display backlight, amplifier enable) up to 2 A with integrated current limiting
EN_SW (Pin 9)	Enable input for power switch	Active-high logic control (1.3–2.3 V threshold); disables SW output when low
AUDIO_LOW_IN (Pin 10)	Hold Audio low-threshold programming	External resistor divider sets 7.8–9.2 V detection point for battery undervoltage warning
VDDCORE (Pin 11)	VDD core reset warning output	Open-drain signal indicating failure of switched 3.3 V/1.8 V rails; used for MCU core reset
VIN1 (Pin 12)	Main input supply (Reg1, Reg2, Reg5, Reg6, SW)	Accepts 9–18 V nominal; handles load dump transients up to 28 V
CAN_LOW_IN (Pin 13)	Hold CAN low-threshold programming	Resistor-programmable 5–6 V detection for CAN bus brownout warning
AUDIO_HIGH_OUT (Pin 14)	Hold Audio high-threshold alert	Open-drain signal asserted when VIN1 exceeds 15.2–17.8 V (overvoltage condition)
AUDIO_LOW_OUT (Pin 15)	Hold Audio low-threshold alert	Open-drain signal asserted when VIN1 drops below 7.8–9.2 V (undervoltage condition)
REG2(5V) (Pin 16)	5.0 V switched regulator output	Primary digital supply for microcontroller I/O, ADC, and communication peripherals
CAN_PRETEMP (Pin 17)	Hold CAN pre-temperature warning output	Combines CAN low/high alerts and load dump detection into single diagnostic flag
REG1(8P5) (Pin 18)	8.5 V switched regulator output	Supplies analog front-end circuits (e.g., tuner, audio DAC, RF section)
EN_8P5_5 (Pin 19)	Enable for Reg1 and Reg2	Single control pin activating both 8.5 V and 5 V rails; logic-compatible with 0–5 V inputs
REG4(1P8sw) (Pin 20)	1.8 V switched regulator output	Core voltage for low-power MCU cores or DSP blocks requiring tight regulation
IGNOUT (Pin 21)	Ignition status output	Open-drain signal reflecting IGNIN state with hysteresis; used for accessory power sequencing
VIN2 (Pin 22)	Secondary input supply (Reg3, Reg4)	Enables operation down to 4.5 V battery level; supports cold-crank scenarios
IGNIN (Pin 23)	Ignition sense input	Monitors vehicle ignition line (0–50 V range); triggers IGNOUT with 30–100 mV hysteresis
REG3(3P3sw) (Pin 24)	3.3 V switched regulator output	Main system supply for MCU core, memory, and high-speed interfaces
EN_3P3_1P8 (Pin 25)	Enable for Reg5 and Reg6 (standby rails)	Controls permanent regulators; 1 kΩ series resistor recommended per datasheet
BU2 (Pin 26)	Backup capacitor interface (switched rails)	Connects to capacitor sustaining REG3/REG4 during battery disconnect events
EN_3P3sw_1P8sw (Pin 27)	Enable for Reg3 and Reg4	Activates main 3.3 V/1.8 V switched supplies; logic-compatible with 0–5 V inputs

Key Features

Feature	Design Value
Dual independent reset chains	Separate RES (standby rails) and VDDCORE (switched rails) outputs with configurable delay and hysteresis ensure robust system boot and fault recovery
Programmable battery warnings	Hold CAN and Hold Audio comparators allow precise tuning of undervoltage/overvoltage thresholds via external resistors for region-specific battery profiles
Backup capacitor interfaces (BU1/BU2)	Two dedicated pins enable seamless power hold-up for standby and switched rails during battery disconnection - critical for CAN wake-up integrity
Load dump protection	Withstands 24–28 V transients on VIN1/VIN2 without latch-up or damage, meeting ISO 7637-2 Pulse 5a requirements
Quasi-zero standby current	4–10 µA total quiescent current with permanent regulators disabled meets automotive "parking mode" current budgets
Dual-supply input architecture	VIN1 (9–18 V) and VIN2 (4.5–18 V) inputs enable cold-crank operation while isolating sensitive regulators from noisy main battery paths

Applications

Infotainment Head Unit Power Management

Automotive CAN Node with Wake-on-CAN

Use Scenario: Central car radio unit requiring stable 8.5 V (tuner), 5 V (MCU I/O), 3.3 V/1.8 V (core logic), plus 3.3 V/1.8 V standby rails for RTC and CAN controller.

IC Role / Device Role / Timing Role: Primary power management IC providing all regulated voltages, reset supervision, battery health monitoring, and ignition-synchronized power sequencing.

Use Value: Eliminates need for discrete LDOs and supervisors; reduces BOM count by ≥6 components while ensuring ISO 16750-2 compliance for load dump and cold crank.

Use Scenario: CAN-enabled telematics module that must remain powered in vehicle sleep mode and wake instantly upon CAN frame reception.

IC Role / Device Role / Timing Role: Supplies 3.3 V standby (REG5) and 1.8 V standby (REG6) with <10 µA quiescent current; BU1 capacitor sustains supply during battery disconnect events.

Use Value: Enables guaranteed CAN wake-up within 100 µs after bus activity, meeting UNECE R100 Class 3 requirements for low-power network nodes.

Engine Control Interface Module

Audio Amplifier Power Sequencing

Use Scenario: Gateway module interfacing engine ECU signals (IGNIN, CAN_PRETEMP) with infotainment system under varying battery conditions.

IC Role / Device Role / Timing Role: Provides ignition sensing (IGNIN/IGNOUT), battery voltage warnings (Hold CAN/Audio), and isolated 5 V/3.3 V supplies for interface logic.

Use Value: Prevents false resets during cranking (4.5 V VIN2 operation) and detects battery degradation before engine stall via dual-threshold CAN warning.

Use Scenario: High-fidelity audio subsystem requiring controlled power-up/down sequencing between analog (8.5 V), digital (5 V/3.3 V), and core (1.8 V) rails.

IC Role / Device Role / Timing Role: Coordinates enable sequencing via EN_8P5_5, EN_3P3sw_1P8sw, and EN_3P3_1P8 pins; SW driver controls amplifier enable line.

Use Value: Avoids pop/click artifacts and latch-up by enforcing strict 8.5 V → 5 V → 3.3 V → 1.8 V power-up order and reverse shutdown sequence.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLE4271-2G	Single 5 V/150 mA LDO with reset and watchdog; no multi-rail capability, no standby regulators, no SW driver	Suitable only for simple MCU supply + reset; cannot replace L5958SM's 6-rail, dual-reset, or CAN-wake architecture	Select only if application requires only basic 5 V regulation and lacks standby, audio, or CAN requirements
VR5510D	Three-output regulator (5 V/3.3 V/1.8 V) with watchdog and reset; no standby rails, no SW driver, no battery warning comparators	Supports basic infotainment logic rails but omits audio/CAN warnings, ignition interface, and backup hold-up capability	Choose when cost-sensitive designs omit battery diagnostics and require only core rail regulation

Compared with TLE4271-2G and VR5510D, the L5958SM uniquely integrates six regulated outputs, dual reset domains, programmable battery warnings, ignition sensing, and backup capacitor support - making it irreplaceable in full-featured automotive radio platforms requiring functional safety-aware power management.

Availability

L5958SM is available at Aetrix Electronics and suitable for automotive infotainment head units, CAN-based telematics modules, and engine interface gateways requiring stable component supply, extended temperature operation (−40 °C to +105 °C), and automotive-grade transient resilience.

Supply support for L5958SM 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, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade analog devices.

The L5958SM belongs to ST's automotive power management product line, engineered specifically for car radio and infotainment systems needing integrated multi-rail regulation, battery health monitoring, and fail-safe reset architecture under harsh automotive electrical conditions.

FAQ

What is the minimum operating voltage for the L5958SM's VIN2 input?

The L5958SM supports VIN2 down to 4.5 V, enabling reliable operation during cold-crank conditions common in automotive environments. This allows Reg3 (3.3 V switched) and Reg4 (1.8 V switched) to remain functional even when battery voltage dips below 6 V, unlike many competing regulators limited to 6 V minimum.

How does the BU1/BU2 backup capacitor interface function during battery disconnection?

BU1 connects to a capacitor sustaining REG5 (3.3 V standby) and REG6 (1.8 V standby); BU2 connects to a separate capacitor sustaining REG3 (3.3 V switched) and REG4 (1.8 V switched). When battery is removed, stored energy maintains these rails long enough for safe MCU shutdown or CAN wake-up acknowledgment - typically >100 ms with 1000 µF capacitors.

Can the Hold CAN and Hold Audio thresholds be adjusted independently?

Yes - Hold CAN threshold is set via resistor divider on CAN_LOW_IN (Pin 13), defining 5–6 V low and 17–20 V high detection points. Hold Audio threshold is set via AUDIO_LOW_IN (Pin 10), defining 7.8–9.2 V low and 15.2–17.8 V high. Both use the same internal 1.2565 V reference, enabling precise, independent tuning for regional battery standards.

What protection features prevent damage during load dump events?

The L5958SM withstands load dump transients up to 28 V on both VIN1 and VIN2 inputs per ISO 7637-2 Pulse 5a, supported by internal clamp structures and thermal shutdown. Its absolute maximum rating is 50 V transient, and it includes overcurrent limiting on all regulators and the SW driver - eliminating need for external TVS diodes in most automotive designs.

L5958SM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 27-Flexiwatt, Formed Leads

Packaging:: Tube

Product Status:: Active

Applications:: Converter, Car Audio System

Voltage - Input:: 4.5V ~ 18V

Number of Outputs:: 4

Voltage - Output:: 1.8V, 3.3V, 5V, 8.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 27-Flexiwatt (SMD)

L5958SM FAQ

1.How can I place an order for L5958SM through Aetrix?

Please submit a Request for Quotation (RFQ) for L5958SM 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 L5958SM reliable?

The price and inventory of L5958SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5958SM is usually 5 days.

3.What payment methods are accepted for L5958SM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5958SM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L5958SM?

L5958SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L5958SM 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 L5958SM?

For technical support, including L5958SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5958SM requirements.

6.How does Aetrix verify that L5958SM is sourced from the original manufacturer or authorized distributors?

All L5958SM 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 L5958SM meets industry standards.

7.What is the process for return or replacement of L5958SM?

All L5958SM units undergo pre-shipment inspection (PSI). If there is an issue with L5958SM, 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 L5958SM part is unused and in its original packaging.

Return procedure for L5958SM:

1.Submit a request within 90 days.

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

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