My Inquiry
My Account
STMicroelectronics L5963Q-V0Y
- Part No.:
- L5963Q-V0Y
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 48-TFQFN Exposed Pad
- Datasheet:
-
L5963Q-V0Y.pdf
- Description:
- IC REG TRP BCK/LNR SYNC 48VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,421
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
L5963Q-V0Y 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, delivering up to 3.0 A per DC/DC channel and 250 mA from the LDO, featuring 180° PWM phase shift, programmable frequency division (1/2/4/8), and load dump protection - used in body control modules and ADAS domain controllers requiring robust power sequencing.
For engineers reviewing the L5963Q-V0Y datasheet, L5963Q-V0Y pinout, L5963Q-V0Y application, or L5963Q-V0Y equivalent, key selection considerations include independent thermal/current protection per regulator, 25 μA standby quiescent current at -40 °C to 85 °C, VQFPN-48 package thermal performance, and hardware-enabling of each regulator and HSD for fail-safe automotive subsystems.
Technical Context
The L5963Q-V0Y integrates two voltage-mode controlled synchronous buck regulators with internal NDMOS switches, each with dedicated enable, soft-start, compensation, feedback, and power-good outputs. Their 180° phase-shifted PWM operation reduces input ripple and EMI, while SYNCIN/SYNCOUT pins support master-slave synchronization across multiple ICs at frequencies from 250 kHz to 2 MHz.
It combines a programmable 250 mA LDO with backup capability and ultra-low IQ (25 μA) in standby mode, a protected 0.5 V max drop HSD capable of short-to-battery/ground detection, and three independent voltage supervisors (VDIN/VDOUT, SW1OK, LDOOK) with configurable delay via external capacitors on dedicated 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 and load-dump transients. |
| DC/DC Output Current | 3.0 A per channel - sufficient to power microcontrollers, sensors, and communication ICs in ECUs. |
| LDO Output Current | 250 mA maximum - enables powering low-noise analog circuits or MCU standby domains. |
| Quiescent Current (Standby) | 25 μA typical @ -40 °C to 85 °C - meets ISO 16750-2 requirements for extended vehicle-off battery life. |
| Switching Frequency Range | 250 kHz to 2 MHz - adjustable via FRDIV and SYNCIN to avoid AM/FM band interference and optimize filter size. |
| HSD On-Resistance | 0.5 V max drop @ 0.5 A - ensures minimal power loss and thermal rise in high-side load switching. |
| AEC-Q100 Grade | Grade 0 (-40 °C to +150 °C junction) - qualified for under-hood and safety-critical automotive applications. |
Pinout & Package
VQFPN-48 (7 mm × 7 mm × 1.0 mm, exposed thermal pad) - optimized for thermal dissipation in space-constrained automotive PCBs; requires soldering of exposed pad to internal ground plane for optimal junction temperature control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND1 / PGND2 (Pins 7,8,5,6) | Power Ground | Dedicated low-impedance return paths for each buck converter's high-current switching loop - minimizes noise coupling between channels. |
| PWM1 / PWM2 (Pins 13,33) | Switching Output | Phase-shifted gate drive signals for external high-side/low-side MOSFETs - enables synchronous rectification without external drivers. |
| ENSW1 / ENSW2 (Pins 10,2) | Enable Input | 1.8/3.3 V logic-compatible active-high controls - allows independent power-up sequencing of each DC/DC stage. |
| VINLDO (Pin 23) / VBAT (Pin 27) | Supply Inputs | Separate inputs for LDO and linear blocks - isolates LDO operation during deep sleep while maintaining bias for supervisors and HSD. |
| VDIN (Pin 15) / VDOUT (Pin 20) | Voltage Monitor Interface | Configurable undervoltage detector input/output - supports custom battery monitoring or secondary rail supervision with user-defined threshold and delay. |
| TAB (exposed pad) | Thermal Slug | Primary heat conduction path to PCB ground plane - critical for sustaining 3 A loads at elevated ambient temperatures. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Synchronous Buck Regulators | Independent 3.0 A outputs with 180° phase shift reduce input capacitor RMS current by ~30% vs. in-phase operation. |
| Programmable Frequency Division | FRDIV pin selects 1×, 2×, 4×, or 8× division ratio between DC/DC1 and DC/DC2 - enables flexible clock tree design without external dividers. |
| Three Independent Power-Good Supervisors | LDOOK, SW1OK, and VDOUT provide open-drain reset/delay outputs with capacitor-programmable timing - supports multi-rail power-up/down sequencing in complex ECUs. |
| Protected High-Side Driver | Integrated diagnostics for short-to-battery, short-to-ground, loss-of-ground, and supply-undervoltage - eliminates need for external fault-handling circuitry. |
| Ultra-Low Standby Quiescent Current | 25 μA at -40 °C to +85 °C with only LDO enabled - extends vehicle battery life during prolonged parking modes. |
Applications
| Body Control Module (BCM) | ADAS Domain Controller |
|---|---|
Use Scenario: Centralized power management for door modules, lighting, and HVAC actuators in modern BCMs. IC Role / Device Role / Timing Role: Dual buck regulators supply 5 V/3.3 V rails to microcontrollers and CAN transceivers; LDO powers real-time clock and watchdog; HSD drives window lift motors. Use Value: Load dump protection and AEC-Q100 qualification ensure uninterrupted operation during alternator transients; independent enable pins allow staggered startup to limit inrush current. | Use Scenario: Powering vision processing SoCs, radar MMICs, and Ethernet switches in centralized ADAS compute units. IC Role / Device Role / Timing Role: One buck supplies 1.1 V core voltage to SoC; second buck delivers 1.8 V I/O; LDO provides clean 3.3 V for SerDes PHYs; HSD controls camera power sequencing. Use Value: 2 MHz sync capability avoids RF interference with radar bands; 180° phase shift lowers EMI emissions below CISPR 25 Class 5 limits; VQFPN-48 thermal performance sustains >2 W dissipation. |
| Infotainment Head Unit | Electric Power Steering (EPS) |
Use Scenario: Multi-rail power delivery for display processors, audio codecs, and USB peripherals in automotive infotainment systems. IC Role / Device Role / Timing Role: Buck1 powers application processor (1.0 V); Buck2 supplies DDR memory (1.2 V); LDO feeds touch controller (3.3 V); HSD manages display backlight dimming. Use Value: Programmable soft-start prevents display flicker during boot; independent power-good signals coordinate firmware initialization across subsystems. | Use Scenario: Safety-critical power conversion for motor control MCU, gate drivers, and position sensors in EPS systems. IC Role / Device Role / Timing Role: Buck regulators supply MCU and sensor rails; LDO powers ASIL-B diagnostic circuitry; HSD drives steering column lock solenoid with short-circuit protection. Use Value: Independent thermal shutdown per regulator prevents single-point failure; AEC-Q100 Grade 0 ensures operation at 150 °C junction temperature near motor housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333-AEC1 | Single 3 A buck with integrated LDO; no HSD or dual-buck phase shift. | Lacks high-side driver and independent second buck - requires external HSD and additional regulator for dual-rail designs. | Select when only one high-current rail plus LDO is needed and board space is constrained. |
| TPS65381A-Q1 | Triple buck + LDO + HSD, but fixed 2.2 MHz frequency and no programmable phase shift or FRDIV. | Higher base frequency increases EMI risk near AM band; no frequency division limits clock tree flexibility. | Prefer for designs prioritizing integration density over EMI tuning and sequencing granularity. |
Compared with MPQ4333-AEC1 and TPS65381A-Q1, the L5963Q-V0Y uniquely combines dual phase-shifted bucks, programmable frequency division, and a protected HSD in a single VQFPN-48 package - enabling compact, EMI-optimized, and fail-safe power architectures for next-generation automotive ECUs.
Availability
L5963Q-V0Y is available at Aetrix Electronics and suitable for body control modules, ADAS domain controllers, infotainment head units, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for L5963Q-V0Y 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 manufacturing and quality certifications.
The L5963 belongs to ST's automotive power system-on-chip (SoC) portfolio, designed specifically for intelligent, integrated, and safety-compliant power management in modern vehicle electronic control units.
FAQ
What is the maximum allowable junction temperature for L5963Q-V0Y in continuous operation?
The L5963Q-V0Y is AEC-Q100 Grade 0 qualified with a maximum junction temperature of +150 °C. Thermal data in Table 6 confirms θJA = 32 °C/W for the VQFPN-48 package with 2-layer 2 oz copper; sustained operation above 135 °C requires derating per Figure 10 in the datasheet and proper PCB thermal design using the exposed pad.
Can the LDO operate independently while both DC/DC converters are disabled?
Yes - the LDO can be enabled via ENLDO while ENSW1 and ENSW2 are held low. In this configuration, VINLDO must be supplied directly from battery or VBAT, and the device enters standby mode with 25 μA quiescent current. The LDOOK output remains functional to monitor VOUTLDO and assert reset if the output drops below threshold.
How does the FRDIV pin configure frequency division between the two DC/DC regulators?
The FRDIV pin accepts a logic-level input to select division ratios: low = 1× (same frequency), 0.5 V < V < 1.0 V = 2×, 1.2 V < V < 1.8 V = 4×, and high = 8×. This sets the ratio between DC/DC1's free-run or synchronized frequency and DC/DC2's operating frequency - enabling interleaved operation without external clock dividers.
Is the SYNCOUT signal compatible with CMOS or TTL logic families?
SYNCOUT is a push-pull output with rail-to-rail swing (VDDLY referenced) and ±20 mA drive capability. It is compatible with standard 3.3 V CMOS logic inputs; for 1.8 V systems, a level shifter is recommended. The output frequency matches DC/DC1's switching frequency and remains active even when DC/DC2 is disabled.
L5963Q-V0Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 48-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), 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:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3.5V ~ 26V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 48-VFQFPN (7x7)
L5963Q-V0Y FAQ
1.How can I place an order for L5963Q-V0Y through Aetrix?
Please submit a Request for Quotation (RFQ) for L5963Q-V0Y 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-V0Y reliable?
The price and inventory of L5963Q-V0Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5963Q-V0Y is usually 5 days.
3.What payment methods are accepted for L5963Q-V0Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5963Q-V0Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L5963Q-V0Y?
L5963Q-V0Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L5963Q-V0Y 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-V0Y?
For technical support, including L5963Q-V0Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5963Q-V0Y requirements.
6.How does Aetrix verify that L5963Q-V0Y is sourced from the original manufacturer or authorized distributors?
All L5963Q-V0Y 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-V0Y meets industry standards.
7.What is the process for return or replacement of L5963Q-V0Y?
All L5963Q-V0Y units undergo pre-shipment inspection (PSI). If there is an issue with L5963Q-V0Y, 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-V0Y part is unused and in its original packaging.
Return procedure for L5963Q-V0Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
L5963Q-V0Y 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…
