My Inquiry
My Account
STMicroelectronics L5963Q-V0T
- Part No.:
- L5963Q-V0T
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 48-TFQFN Exposed Pad
- Datasheet:
-
L5963Q-V0T.pdf
- Description:
- IC REG TRP BCK/LNR SYNC 48VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,828
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
L5963Q-V0T from STMicroelectronics is an AEC-Q100 qualified automotive dual synchronous step-down switching regulator with integrated LDO and high-side driver, operating from 3.5 V to 26 V input. It delivers two independent 3.0 A DC/DC outputs (180° phase-shifted, 250 kHz–2 MHz syncable), a 250 mA programmable LDO, and a protected 0.5 A high-side driver with <0.5 V drop. Used in body control modules and ADAS domain controllers for robust power sequencing under load dump and cold-crank conditions.
For engineers reviewing the L5963Q-V0T datasheet, L5963Q-V0T pinout, L5963Q-V0T application, or L5963Q-V0T equivalent, key selection criteria include its dual-DC/DC phase-shifted operation, VINLDO/VINSW1/VINHSD triple-rail capability, independent thermal/current protection per regulator, and VQFPN-48 package suitability for thermally constrained automotive PCB layouts.
Technical Context
The L5963 employs voltage-mode control with feed-forward compensation in both DC/DC regulators, enabling stable regulation across wide line (3.5–26 V) and load (0–3 A) ranges. Each regulator features 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 in standby mode (25 μA IQ @ –40 °C to 85 °C) when ENLDO is tied to VINLDO, or in normal mode (higher IOUT, higher IQ) when ENLDO is driven below 5 V. Its output voltage is set by an external resistor divider on FBLDO, and monitored by open-drain LDOOK with hysteresis and delay.
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 (40 V transient clamped). |
| DC/DC Output Current | 3.0 A per channel - sufficient to power dual-core MCUs or SoCs in gateway or zone controllers. |
| Switching Frequency | 250 kHz free-run or 250 kHz–2 MHz syncable - enables EMI optimization and use of compact 2.2 μH inductors. |
| LDO Output Current | 250 mA max - powers low-noise analog sensors or real-time clock circuits without external LDO. |
| HSD On-Resistance | ≤0.5 V drop @ 0.5 A - ensures minimal voltage loss driving solenoids or LED strings directly from battery. |
| Quiescent Current (Standby) | 25 μA typical @ –40 °C to 85 °C - meets ISO 16750-2 Class D sleep current requirements for always-on modules. |
| AEC-Q100 Grade | Grade 1 (–40 °C to 125 °C junction) - qualified for engine bay and under-hood applications. |
Pinout & Package
VQFPN-48 (7 mm × 7 mm × 1.0 mm, exposed thermal pad), optimized for thermal performance in space-constrained automotive modules. Slug-up variant not applicable; this order code uses standard slug-down configuration with thermal pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 5–6, 7–8, 37–38, 41–42, 45–46 | PGND1 / PGND2 | Dedicated power ground returns for each DC/DC stage - minimizes switching noise coupling into sensitive analog blocks. |
| 14, 32 | ENHSD / ENLDO | 1.8/3.3 V logic-compatible enables - allow direct MCU GPIO control without level-shifting. |
| 13, 33 | PWM1 / PWM2 | High-current gate-drive outputs - drive external N-channel MOSFETs in bootstrap configuration (internal switches used by default). |
| 20, 21, 22 | VDOUT / LDOOK / SW1OK | Open-drain power-good outputs - support wired-OR sequencing and reset assertion with user-defined delay via capacitor. |
| 17–18, 31, 23, 16 | VINSW1 / VINSW2 / VINLDO / VINHSD | Independent supply inputs - permit flexible rail partitioning (e.g., VINSW1 from main battery, VINLDO from pre-regulated 5 V). |
Key Features
| Feature | Design Value |
|---|---|
| 180° PWM phase shift | Reduces input ripple current by ~70%, allowing smaller bulk input capacitors and lower RMS losses in shared VIN traces. |
| Programmable FRDIV (÷1/2/4/8) | Enables synchronized frequency scaling between DC/DC1 and DC/DC2 - critical for multi-rail systems avoiding beat-frequency interference. |
| Independent current limit per regulator | Prevents fault propagation: overcurrent on DC/DC1 does not disable LDO or HSD, preserving system-level fail-safe behavior. |
| Load dump protection | Withstands 40 V transients per ISO 7637-2 Pulse 5a - eliminates need for external TVS diodes on main input rails. |
| Adjustable under-voltage detection (VDIN) | Configurable threshold via external resistor divider - supports custom brown-out detection for battery, DC/DC2 output, or other system nodes. |
Applications
| Body Control Module (BCM) | ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceivers, and door-lock actuators from 12 V battery with cold-crank resilience. IC Role / Device Role / Timing Role: Dual DC/DC supplies 3.3 V for MCU core and 5 V for I/O; LDO powers CAN PHY; HSD drives door lock solenoid. Use Value: Integrated phase-shifted regulation reduces input capacitance by 40% vs. discrete solutions; load dump tolerance eliminates external clamping components. |
Use Scenario: Supplying vision processor, radar SoC, and safety monitor IC in centralized ADAS ECU with strict thermal and sequencing constraints. IC Role / Device Role / Timing Role: DC/DC1 powers processor core (1.1 V/3 A), DC/DC2 supplies I/O (1.8 V/3 A), LDO feeds safety watchdog (3.3 V/150 mA), all sequenced via LDOOK/SW1OK. Use Value: Independent enable and power-good signals enable precise boot-order control; VQFPN-48 thermal pad supports 2.5 W dissipation at 60 °C ambient. |
| Infotainment Head Unit | Electric Power Steering (EPS) |
|
Use Scenario: Delivering clean, low-noise power to audio codec, display driver, and touch controller while minimizing AM/FM band emissions. IC Role / Device Role / Timing Role: Synchronized 2 MHz DC/DC operation shifts switching noise above AM band; LDO supplies audio DAC with PSRR >60 dB @ 100 kHz. Use Value: Sync-in capability allows alignment with system master clock, eliminating heterodyne tones; low 25 μA standby IQ extends battery life during vehicle sleep. |
Use Scenario: Providing redundant, fault-isolated power to torque sensor, motor gate drivers, and ASIL-B MCU in EPS column module. IC Role / Device Role / Timing Role: DC/DC1 powers MCU (3.3 V), DC/DC2 powers motor drivers (5 V), HSD controls auxiliary pump; independent thermal shutdown prevents single-point failure. Use Value: Triple-rail independence (VINSW1/VINSW2/VINLDO) enables physical separation of safety-critical and non-safety rails; AEC-Q100 Grade 1 ensures operation at 125 °C junction. |
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 | Dual 3 A buck only (no LDO/HSD); requires external linear regulator and high-side switch. | Lacks integrated standby LDO and protected HSD - increases BOM count and board area for BCM/EPS use cases. | Select when only dual-buck functionality is needed and system already includes discrete LDO/HSD with required protection. |
| TPS65381A-Q1 | Triple buck + LDO + HSD, but fixed 1.2/2.5/3.3 V outputs; no programmable VOUT or sync-in. | Less flexible for custom voltage rails; no frequency synchronization - limits EMI mitigation in dense RF environments. | Select for cost-sensitive, fixed-rail applications where design reuse of reference schematics outweighs programmability needs. |
Compared with NCP81239MNTXG and TPS65381A-Q1, the L5963Q-V0T uniquely combines dual programmable bucks, a standby-capable LDO, and a protected HSD in one VQFPN-48 package - reducing component count by ≥5 devices while enabling advanced power sequencing and thermal management in ASIL-B systems.
Availability
L5963Q-V0T is available at Aetrix Electronics and suitable for automotive body control modules, ADAS domain controllers, and electric power steering systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for L5963Q-V0T 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 ICs, with broad manufacturing scale and AEC-Q100 validation infrastructure.
The L5963 belongs to ST's automotive power system-on-chip (SoP) family, designed specifically for consolidated, high-reliability power delivery in next-generation zonal architectures and domain controllers.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The L5963Q-V0T is rated for continuous operation up to 150 °C junction temperature, validated per AEC-Q100 Grade 1 (–40 °C to +125 °C ambient). Thermal derating begins at 125 °C ambient in VQFPN-48 package with 2-layer 2 oz copper PCB; full 3.0 A per DC/DC is guaranteed up to 105 °C ambient with proper thermal pad soldering.
Can the LDO operate independently while both DC/DCs are disabled?
Yes. The LDO can be enabled via ENLDO while ENSW1 and ENSW2 are held low. In this configuration, it draws only 25 μA quiescent current (typical) and supplies up to 250 mA - ideal for maintaining RTC, CAN wake-up logic, or security module power during deep sleep.
How is the 180° phase shift between PWM1 and PWM2 implemented and verified?
The phase shift is hardwired in silicon via internal timing logic that delays the second PWM edge by half the switching period. It is verified in production test using high-speed oscilloscope capture of both PWM outputs under load, confirming consistent 180° offset across temperature (–40 °C to 125 °C) and input voltage (4.5 V to 26 V).
Does the HSD support PWM dimming of LED loads?
Yes. The HSD supports up to 20 kHz PWM switching when driven by a logic-level signal on ENHSD, with turn-on/turn-off times of 1.2 μs/0.8 μs (typical). Its 0.5 V max drop at 0.5 A ensures minimal power loss during high-duty-cycle dimming in interior lighting applications.
L5963Q-V0T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-TFQFN Exposed Pad
- 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:
- 48-VFQFPN (7x7)
L5963Q-V0T FAQ
1.How can I place an order for L5963Q-V0T through Aetrix?
Please submit a Request for Quotation (RFQ) for L5963Q-V0T 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 L5963Q-V0T reliable?
The price and inventory of L5963Q-V0T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5963Q-V0T is usually 5 days.
3.What payment methods are accepted for L5963Q-V0T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5963Q-V0T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L5963Q-V0T?
L5963Q-V0T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L5963Q-V0T 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 L5963Q-V0T?
For technical support, including L5963Q-V0T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5963Q-V0T requirements.
6.How does Aetrix verify that L5963Q-V0T is sourced from the original manufacturer or authorized distributors?
All L5963Q-V0T 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 L5963Q-V0T meets industry standards.
7.What is the process for return or replacement of L5963Q-V0T?
All L5963Q-V0T units undergo pre-shipment inspection (PSI). If there is an issue with L5963Q-V0T, 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 L5963Q-V0T part is unused and in its original packaging.
Return procedure for L5963Q-V0T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
L5963Q-V0T Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
