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

STMicroelectronics L5963DN-EHT

Name: L5963DN-EHT
Brand: STMicroelectronics
SKU: L5963DN-EHT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L5963DN-EHT

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear + Switching

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

Datasheet:: L5963DN-EHT.pdf

Description:: IC REG TRP BCK/LNR SYNC PWRSSO36

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L5963DN-EHT from STMicroelectronics is an AEC-Q100 qualified automotive dual monolithic switching regulator IC integrating two synchronous step-down DC/DC converters (3.5–26 V input, 3.0 A each), one programmable LDO (250 mA, 25 μA standby I_Q), and one protected high-side driver (0.5 V drop @ 0.5 A). It features independent enable pins, 180° PWM phase shift, load dump protection, and programmable under-voltage detection - deployed in engine control units and ADAS domain controllers requiring robust power sequencing.

For engineers reviewing the L5963DN-EHT datasheet, L5963DN-EHT pinout, L5963DN-EHT application, or L5963DN-EHT equivalent, key selection criteria include its dual-DC/DC synchronization capability (250 kHz–2 MHz), thermal/current protection per regulator, and PowerSSO-36 (exposed pad) package compatibility with automotive PCB thermal management requirements.

Technical Context

The L5963 employs voltage-mode control with feed-forward for fast line/load regulation across both DC/DCs, each featuring independent soft-start, hardware enable, and 180° phase-shifted PWM outputs to reduce input ripple and EMI. The integrated LDO operates in either low-I_Q standby mode (25 μA) or higher-current non-standby mode via ENLDO configuration.

Its high-side driver includes short-to-battery, short-to-ground, loss-of-ground, and unsupplied-short protection; the adjustable voltage detector (VDIN/VDOUT) supports customizable power-up/down sequencing with capacitor-programmable delay on LDOOKDLY, SW1OKDLY, and VDDLY pins.

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 (4.5 V) and load dump (26 V).
DC/DC Output Current	3.0 A per channel - sufficient to power dual-core MCUs or image sensors without external current boosting.
Switching Frequency	250 kHz free-run or 250 kHz–2 MHz sync range - enables EMI optimization and use of compact 1.0–2.2 μH inductors.
LDO Quiescent Current	25 μA typical @ –40 °C to 85 °C - meets automotive always-on module sleep-mode current budgets.
HSD On-Resistance	0.5 V max drop @ 0.5 A - ensures minimal voltage loss driving 12 V loads like solenoids or relays.
Thermal Protection	Independent per regulator - prevents latch-up during sustained overload without affecting other power rails.
Package	PowerSSO-36 (exposed pad) - thermal pad must be soldered to PCB ground plane for 3.5 W dissipation capability.

Pinout & Package

PowerSSO-36 (exposed pad) package: 36-pin thermally enhanced surface-mount housing with exposed metal slug (TAB, Pin 1) requiring direct connection to PCB ground plane for thermal conduction and EMI shielding.

Pin/Terminal	Circuit Role	Design Meaning
1 (TAB)	Thermal slug / GND	Mandatory ground connection for heat dissipation and noise reduction; not electrically isolated.
2, 36 (PGND1, PGND2)	Power ground	Separate high-current return paths for each DC/DC to minimize cross-regulator coupling.
3, 35 (ENSW1, ENSW2)	Enable input	1.8/3.3 V logic-compatible; allows independent startup sequencing of DC/DC1 and DC/DC2.
5, 33 (PWM1, PWM2)	Switching output	Phase-shifted 180° PWM signals - reduces input capacitor RMS current by ~30% vs. in-phase operation.
8 (SYNCOUT), 9 (SYNCIN)	Synchronization interface	Enables master-slave frequency alignment across multiple L5963 devices for system-level EMI control.
17, 31 (VINSW1, VINSW2)	DC/DC supply input	Accepts direct connection to vehicle battery - no external pre-regulator needed for 3.5–26 V operation.
20 (VOUTLDO)	LDO output	Programmable via external resistor divider; supports MCU core voltage (e.g., 1.2 V) or I/O rail (3.3 V).
21 (LDOOK)	Open-drain reset	Asserts low when VOUTLDO drops below threshold - provides hardware reset signal to connected microcontroller.

Key Features

Feature	Design Value
Dual synchronized DC/DC with 180° phase shift	Reduces input ripple current amplitude and eases filtering component selection for compact layout.
Independent thermal/current protection per regulator	Prevents single-fault propagation - e.g., DC/DC1 overcurrent shutdown does not disable LDO or HSD.
Configurable LDO standby mode (25 μA I_Q)	Enables ultra-low-power always-on functionality for CAN wake-up circuits without compromising rail stability.
Integrated voltage detector with programmable delay	Capacitor-based timing on VDDLY/LDOOKDLY/SW1OKDLY enables precise power-up sequencing across multiple rails.
High-side driver with loss-of-ground protection	Continues safe operation even if chassis ground connection degrades - critical for safety-critical body electronics.

Applications

Engine Control Unit (ECU)

Advanced Driver Assistance Systems (ADAS)

Use Scenario: Powering dual-core automotive MCU, CAN transceiver, and sensor interface circuitry in gasoline/diesel engine compartments.

IC Role / Device Role / Timing Role: Primary power management IC delivering 5 V (DC/DC1), 3.3 V (DC/DC2), and 1.2 V (LDO) with synchronized startup and fault-isolated shutdown.

Use Value: Load dump protection and –40 °C to 150 °C operating range ensure reliability under extreme under-hood thermal cycling.

Use Scenario: Supplying radar SoC, camera ISP, and Ethernet AVB PHY in front-camera or corner-radar modules.

IC Role / Device Role / Timing Role: Dual DC/DC regulators provide clean, low-noise 1.1 V core and 1.8 V I/O rails; LDO powers reference voltage for ADCs.

Use Value: 180° phase shift minimizes conducted EMI in sensitive RF zones, meeting CISPR 25 Class 5 limits without added shielding.

Body Control Module (BCM)

Infotainment Head Unit

Use Scenario: Managing power for door lock actuators, interior lighting, and LIN bus nodes in centralized body electronics.

IC Role / Device Role / Timing Role: High-side driver controls 12 V solenoid loads; DC/DCs power microcontrollers and communication interfaces.

Use Value: Loss-of-ground and short-to-battery protection prevent latch-up during wiring faults common in vehicle assembly and service.

Use Scenario: Regulating power for application processor, display controller, and audio codec in dashboard infotainment systems.

IC Role / Device Role / Timing Role: LDO supplies low-noise 3.3 V for audio DAC; DC/DCs deliver 5 V USB and 1.0 V core voltage with soft-start sequencing.

Use Value: Programmable under-voltage detection (VDIN) triggers graceful shutdown before battery sag disrupts boot sequence.

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 3.5–28 V buck (4 A), no integrated LDO or HSD - requires external components for full L5963 functionality.	Lacks standby LDO and protected HSD; suitable only where discrete LDO/HSD already exist in design.	Select when board space permits separate LDO/HSD and cost sensitivity outweighs integration benefit.
TPS65381AQDAGRRQ1	Triple buck (3 A/2 A/2 A) + LDO (150 mA) + watchdog - no HSD, lower I_Q (15 μA) but no load dump protection.	Targeted at functional-safety ASIL-B systems; lacks automotive-grade load dump immunity required for direct battery tie-in.	Select for ISO 26262-compliant designs needing watchdog and diagnostic coverage, not for direct battery-fed modules.

Compared with NCP81239MNTXG and TPS65381AQDAGRRQ1, the L5963DN-EHT uniquely combines dual high-current DC/DC, ultra-low-I_Q LDO, and protected HSD in one AEC-Q100 package - eliminating four discrete ICs while maintaining full automotive transient resilience.

Availability

L5963DN-EHT is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and body control modules requiring stable component supply across extended automotive temperature ranges and lifecycle commitments.

Supply support for L5963DN-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 specializing in automotive, industrial, and power management solutions, with broad manufacturing scale and AEC-Q100 validation infrastructure.

The L5963 belongs to ST's automotive power system-on-chip (SoC) portfolio, designed specifically for integrated power management in next-generation vehicle ECUs and domain controllers where space, thermal efficiency, and functional safety are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The L5963DN-EHT has a maximum junction temperature of 150 °C per AEC-Q100 Grade 1 specification. Thermal derating begins above 125 °C ambient; with PowerSSO-36 mounted on 2 oz copper + 2 internal ground planes, it sustains 3.5 W total dissipation at 85 °C ambient.

Can the LDO operate independently while both DC/DCs are disabled?

Yes - the LDO (enabled via ENLDO) functions fully standalone. When only VINLDO is powered and ENLDO is asserted, the device draws just 25 μA quiescent current, making it ideal for always-on wake-up circuits without activating switching regulators.

How is load dump protection implemented without external TVS diodes?

Internal clamp circuitry on VINSW1/VINSW2/VINHSD/VINLDO pins limits transient voltage to 34 V during ISO 7637-2 Pulse 5a (load dump), eliminating need for external 36 V TVS diodes while maintaining compliance with automotive surge standards.

What is the minimum output voltage achievable with the DC/DC regulators?

Both DC/DC regulators support 1.0 V minimum output voltage using external feedback resistors. This is enabled by the internal 0.6 V reference and voltage-mode control architecture, allowing direct powering of modern low-voltage MCUs and FPGAs.

L5963DN-EHT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

L5963DN-EHT FAQ

1.How can I place an order for L5963DN-EHT through Aetrix?

Please submit a Request for Quotation (RFQ) for L5963DN-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 L5963DN-EHT reliable?

The price and inventory of L5963DN-EHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5963DN-EHT is usually 5 days.

3.What payment methods are accepted for L5963DN-EHT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5963DN-EHT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L5963DN-EHT?

L5963DN-EHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L5963DN-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 L5963DN-EHT?

For technical support, including L5963DN-EHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5963DN-EHT requirements.

6.How does Aetrix verify that L5963DN-EHT is sourced from the original manufacturer or authorized distributors?

All L5963DN-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 L5963DN-EHT meets industry standards.

7.What is the process for return or replacement of L5963DN-EHT?

All L5963DN-EHT units undergo pre-shipment inspection (PSI). If there is an issue with L5963DN-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 L5963DN-EHT part is unused and in its original packaging.

Return procedure for L5963DN-EHT:

1.Submit a request within 90 days.

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

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