STMicroelectronics L5965SQ-V0Y

Overview

L5965SQ-V0Y from STMicroelectronics is an AEC-Q100 qualified multichannel power management IC for automotive vision and radar systems, integrating two pre-regulator BUCKs (one controller, one integrated), four post-regulators (two BUCKs, one BOOST, one LDO), and a precision voltage reference. It delivers 0.8–5.0 V outputs across seven rails with OTP-programmable voltages, frequencies (0.4–2.4 MHz), current limits (0.3–2.6 A), and power-up sequencing. Its VFQFPN-48 package supports thermal shutdown at 175 °C and functional safety up to ASIL-D.

For engineers reviewing the L5965SQ-V0Y datasheet, L5965SQ-V0Y pinout, L5965SQ-V0Y application, or L5965SQ-V0Y equivalent, key selection criteria include OTP-configurable output voltages per rail, SPI-enabled real-time monitoring and fault reporting (FAULT/RESET_B), integrated compensation networks reducing external components, and dual battery-compatible inputs (VBAT1/VBAT2) enabling robust start-stop operation in 12 V automotive systems.

Technical Context

The L5965SQ-V0Y implements a hierarchical power architecture: BUCK1 operates as an external-MOS controller (0.4 MHz, 0.8–5.0 V), while BUCK2–BUCK4, BOOST, and LDO integrate internal power switches and operate at 2.4 MHz (except BUCK2's dual-mode 0.4/2.4 MHz). All switching regulators use internal compensation and support phase-shifted operation (0°, 90°, 180°, 270°) to reduce input ripple.

Safety-critical features include independent voltage supervisors per rail, programmable window watchdog (WDI input), overtemperature warning (140–170 °C) and thermal shutdown (160–190 °C), fault pin assertion on short-circuit or undervoltage, and SPI-accessible diagnostic registers with CRC protection-enabling ISO 26262-compliant system-level monitoring.

Key Specifications

Pinout & Package

VFQFPN-48 (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin count: 48. Package meets AEC-Q100 Grade 0 (−40 °C to +150 °C T_j) requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multirail automotive PMIC applications.

Compared with MPQ4436-AEC1 and TPS65381A-Q1, the L5965SQ-V0Y uniquely combines 7 OTP-configurable rails-including BOOST and precision VREF-with full SPI diagnostics and ASIL-D support, making it the only option for high-integration automotive vision/radar ECUs requiring both power density and functional safety certification.

Availability

L5965SQ-V0Y is available at Aetrix Electronics and suitable for automotive ADAS camera modules, radar transceivers, infotainment head units, and electric power steering control units requiring stable component supply across extended temperature and safety-critical operating conditions.

Supply support for L5965SQ-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 solutions with broad manufacturing and R&D infrastructure.

The L5965 product line targets high-reliability automotive power systems, specifically engineered to consolidate multiple voltage domains in vision, radar, and domain-controller ECUs while meeting ASIL-D functional safety requirements.

FAQ

What is the maximum allowable input voltage on VBAT1 and VBAT2?

VBAT1 and VBAT2 each support −0.3 V to 42 V absolute maximum ratings, with recommended operating range of −0.3 V to 32 V. These inputs are designed for direct connection to automotive 12 V battery systems, including load-dump transients up to 34 V (OV threshold) and cold-crank down to 3 V (POR threshold).

Can the L5965SQ-V0Y generate a 7.0 V BOOST output while powering other rails simultaneously?

Yes-the BOOST regulator delivers 7.0 V at up to 0.2 A while all other rails operate. Its 2.4 MHz switching frequency, internal compensation, and dedicated PGND5 minimize interference with sensitive analog rails like VREF or LDO outputs, and its output is monitored independently for overvoltage/undervoltage faults.

How does the OTP programming affect production workflow?

OTP cells configure output voltages, switching frequencies, current limits, and power-up sequence before first power-on. Programming occurs at wafer test or customer line using standard SPI commands-no special equipment required. Once programmed, settings are permanent and immune to EMI or voltage glitches, ensuring consistent behavior across vehicle lifetime.

Is thermal performance validated for continuous operation at 125 °C ambient?

Yes-thermal data confirms 150 °C maximum junction temperature (T_j) with R_{th j-a-2s2pvias} = 26 °C/W. At 125 °C ambient, maximum suggested power dissipation is 3.2 W using 2s2p layout with vias, sufficient for full 7-rail operation with typical automotive derating margins.