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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

STMicroelectronics L5963D-EHT

Name: L5963D-EHT
Brand: STMicroelectronics
SKU: L5963D-EHT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L5963D-EHT

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear + Switching

Package:: 36-PowerFSOP (0.295", 7.50mm Width)

Datasheet:: L5963D-EHT.pdf

Description:: IC REG TRP BCK/LNR SYNC PWRSSO36

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Product details

Overview

L5963D-EHT from STMicroelectronics is an AEC-Q100 qualified automotive dual synchronous step-down switching regulator with integrated LDO and high-side driver. It delivers 3.0 A per DC/DC channel (VIN: 3.5–26 V), supports 180° phase-shifted PWM operation, includes programmable frequency division (1/2/4/8), and provides independent thermal/current protection for all regulators. It is used in vehicle body control modules requiring robust load dump protection and multi-rail power sequencing.

For engineers reviewing the L5963D-EHT datasheet, L5963D-EHT pinout, L5963D-EHT application, or L5963D-EHT equivalent, key selection criteria include its dual-DC/DC + LDO + HSD integration, 25 μA standby quiescent current, 0.5 V HSD dropout at 0.5 A, adjustable under-voltage detection via VDIN, and PowerSSO-36 (exposed pad) package thermal performance.

Technical Context

The L5963D-EHT implements voltage-mode control with feed-forward compensation in both synchronous buck regulators, enabling stable line/load regulation across wide input (3.5–26 V) and output (≥1 V) ranges. Each DC/DC has independent enable (ENSW1/ENSW2), soft-start, and power-good monitoring (SW1OK/SW2OK) with configurable delay via external capacitors on SW1OKDLY/SW2OKDLY pins.

The integrated LDO operates as either a low-I_Q standby regulator (25 μA @ –40°C to 85°C, ENLDO tied to VINLDO) or higher-current mode (250 mA max, ENLDO < 5 V), with dedicated LDOOK open-drain reset output and delay setting via LDOOKDLY. The HSD features short-to-battery/ground, loss-of-ground, and unsupplied-short protection with 0.5 V max dropout at 0.5 A.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.5 V to 26 V - supports full automotive battery range including cold-crank and load-dump transients.
DC/DC Output Current	3.0 A per channel - sufficient to power microcontrollers, CAN transceivers, and sensor interfaces directly.
Switching Frequency	250 kHz free-run or 250 kHz–2 MHz sync range - enables EMI optimization and compact magnetics selection.
LDO Quiescent Current	25 μA typical in standby mode - meets ultra-low-power requirements for always-on vehicle subsystems.
HSD Dropout Voltage	≤0.5 V @ 0.5 A - minimizes conduction loss in high-side load switching applications like lighting or solenoid control.
Thermal Protection	Independent per regulator - prevents thermal runaway during overload or poor PCB heatsinking conditions.
Under-Voltage Detection	Adjustable threshold via VDIN pin - enables customizable battery monitoring and system-level power-up sequencing.

Pinout & Package

Package: PowerSSO-36 (exposed pad), thermally enhanced slug-down configuration requiring direct connection of the TAB (Pin 1) to PCB ground plane for optimal heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1 TAB	Thermal slug	Must be soldered to large copper ground plane for thermal management; not electrically isolated.
2 PGND1	Power ground	Return path for DC/DC1 high-current switching loop; separate from SGND to minimize noise coupling.
3 ENSW1	Enable input	1.8/3.3 V logic-compatible; controls DC/DC1 startup/shutdown independently.
5 PWM1	Switching output	High-frequency PWM node driving external inductor; requires low-inductance layout to PGND1.
8 SYNCOUT	Synchronization output	Push-pull signal providing DC/DC1 operating frequency for master-slave synchronization of multiple L5963 devices.
17 HSD	High-side driver output	Drives external loads directly; protected against shorts and supply faults; requires external flyback diode for inductive loads.
20 VOUTLDO	LDO output	Programmable regulated output (via FBLDO feedback); supplies low-noise rails for MCUs or analog sensors.
30 SW1OK	Power-good indicator	Open-drain output signaling DC/DC1 output is within ±5% regulation window; delay set by capacitor on SW1OKDLY.

Key Features

Feature	Design Value
Dual synchronized buck regulators	180° phase shift reduces input ripple current by ~70%, allowing smaller input capacitors and lower EMI.
Programmable frequency divider	1/2/4/8 division between DC/DC1 and DC/DC2 enables optimized efficiency vs. EMI trade-offs in multi-rail systems.
Integrated HSD with fault protection	Eliminates need for discrete high-side switch and protection IC in body electronics, reducing BOM count and board area.
Configurable voltage detectors	Three independent open-drain outputs (SW1OK, LDOOK, VDOUT) with user-settable delays support precise power-up/down sequencing.
Automotive-grade thermal design	Independent thermal shutdown per regulator ensures safe operation even under localized overheating (e.g., one DC/DC overloaded).

Applications

Body Control Module (BCM)

Advanced Driver Assistance Systems (ADAS) Power Hub

Use Scenario: Centralized power management for door modules, seat controls, and lighting drivers in modern BCMs.

IC Role / Device Role / Timing Role: Dual DC/DC supplies 5 V/3.3 V rails for MCU and CAN transceivers; LDO powers real-time clock; HSD drives interior lighting loads.

Use Value: Single-chip solution replaces 4+ discrete regulators and switches, reducing footprint by >40% while meeting AEC-Q100 Grade 1 temperature requirements.

Use Scenario: Power distribution unit for radar, camera, and sensor fusion ECUs requiring clean, sequenced, and fault-tolerant supplies.

IC Role / Device Role / Timing Role: DC/DC1 powers imaging sensor (2.8 V), DC/DC2 powers radar SoC (1.1 V), LDO supplies reference voltage, HSD enables sensor power gating.

Use Value: Independent power-good signals and programmable delays ensure deterministic boot order across heterogeneous sensor subsystems.

Infotainment Head Unit

Electric Power Steering (EPS) Auxiliary Supply

Use Scenario: Multi-rail power for display controller, audio codec, and connectivity modules (Wi-Fi/BT) in head units.

IC Role / Device Role / Timing Role: DC/DC regulators deliver 1.2 V core and 3.3 V I/O rails; LDO supplies low-noise 1.8 V for audio ADC/DAC; HSD controls backlight dimming.

Use Value: PSRR >60 dB (100 Hz–100 kHz) of LDO ensures minimal switching noise coupling into sensitive audio paths.

Use Scenario: Secondary power source for EPS motor control logic and communication interfaces during main inverter fault conditions.

IC Role / Device Role / Timing Role: LDO operates in standby mode (25 μA I_Q) to maintain MCU watchdog and CAN wake-up circuitry; HSD enables backup power path activation.

Use Value: Ultra-low quiescent current extends battery hold-up time beyond ISO 16750-2 pulse 4a requirements for safety-critical EPS functions.

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
MPQ4332-AEC1	Dual 3 A synchronous buck only; no integrated LDO or HSD; requires external components for sequencing and load switching.	Lacks single-chip integration for LDO/HSD functions; suitable when discrete control of each rail is preferred.	Select when system already uses separate LDO/HSD ICs and only needs high-efficiency dual-buck capability.
TPS65381A-Q1	Triple buck + LDO + HSD + watchdog timer; higher pin count (64-QFN); supports ASIL-B functional safety diagnostics.	Includes safety mechanisms (CRC, register lock, fault reporting) not present in L5963D-EHT.	Select when ASIL-B compliance and diagnostic coverage are mandatory for safety-critical domains.

Compared with MPQ4332-AEC1, L5963D-EHT reduces component count and layout complexity by integrating LDO and HSD; versus TPS65381A-Q1, it offers lower cost and smaller footprint but omits functional safety features required for ASIL-B systems.

Availability

L5963D-EHT is available at Aetrix Electronics and suitable for automotive body electronics, ADAS power hubs, infotainment head units, and EPS auxiliary supplies requiring stable component supply across extended temperature and qualification cycles.

Supply support for L5963D-EHT 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 product portfolios.

The L5963 belongs to ST's automotive power system-on-chip (SoC) family, designed specifically for centralized multi-rail power architectures in body electronics and ADAS domains where integration, reliability, and qualification compliance are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The L5963D-EHT has a maximum junction temperature of 150°C, with independent thermal shutdown thresholds set at 165°C for each regulator block. Operation above 125°C de-rates output current per thermal data in Table 5 of the datasheet, and sustained operation above 150°C violates absolute maximum ratings and risks permanent damage.

Can the LDO and DC/DC regulators operate simultaneously from the same input source?

Yes - all regulators (DC/DC1, DC/DC2, LDO, HSD) accept input directly from the vehicle battery (3.5–26 V). VINLDO, VINSW1, VINSW2, and VINHSD are internally isolated but share common overvoltage and undervoltage supervision. Simultaneous operation is supported and commonly implemented in automotive power trees.

How is the 180° phase shift between DC/DC1 and DC/DC2 achieved and verified?

The 180° phase shift is hardwired in the internal oscillator architecture and does not require external configuration. It is confirmed in Figure 1 (block diagram) and Section 6.2.12 of the datasheet, and measurable at PWM1 and PWM33 pins using an oscilloscope with proper probing to avoid ground loop artifacts.

Does the HSD support PWM dimming of LED loads?

Yes - the HSD output (Pin 17) is fully compatible with PWM control up to 25 kHz. Its 0.5 V dropout at 0.5 A and fast turn-on/turn-off times (<1 μs) enable efficient LED dimming without external gate drivers; however, external flyback protection is required for inductive LED drivers.

L5963D-EHT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerFSOP (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Topology:: Step-Down (Buck) Synchronous (2), Linear (LDO) (1)

Number of Outputs:: 3

Frequency - Switching:: 250kHz ~ 2MHz

Voltage/Current - Output 1:: Programmable, 2.5A

Voltage/Current - Output 2:: Programmable, 3A

Voltage/Current - Output 3:: Programmable, 250mA

w/LED Driver:: No

w/Supervisor:: Yes

w/Sequencer:: Yes

Voltage - Supply:: 3.5V ~ 26V

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSSO-36 EPU

L5963D-EHT FAQ

1.How can I place an order for L5963D-EHT through Aetrix?

Please submit a Request for Quotation (RFQ) for L5963D-EHT 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 L5963D-EHT reliable?

The price and inventory of L5963D-EHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5963D-EHT is usually 5 days.

3.What payment methods are accepted for L5963D-EHT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5963D-EHT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L5963D-EHT?

L5963D-EHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L5963D-EHT 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 L5963D-EHT?

For technical support, including L5963D-EHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5963D-EHT requirements.

6.How does Aetrix verify that L5963D-EHT is sourced from the original manufacturer or authorized distributors?

All L5963D-EHT 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 L5963D-EHT meets industry standards.

7.What is the process for return or replacement of L5963D-EHT?

All L5963D-EHT units undergo pre-shipment inspection (PSI). If there is an issue with L5963D-EHT, 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 L5963D-EHT part is unused and in its original packaging.

Return procedure for L5963D-EHT:

1.Submit a request within 90 days.

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

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