STMicroelectronics L5965SQ-V0T

Overview

L5965SQ-V0T from STMicroelectronics is an AEC-Q100 qualified multichannel power management IC (PMIC) for automotive vision and radar systems. It integrates two pre-regulator BUCKs (one controller, one integrated-switch), four post-regulator BUCKs, one BOOST, one LDO, and a precision voltage reference - all programmable via OTP. Key confirmed parameters: 0.4–2.4 MHz switching frequency, 175 °C thermal shutdown, ±2.5% output voltage accuracy, SPI interface with CRC, and ASIL-B/C functional safety support.

For engineers reviewing the L5965SQ-V0T datasheet, L5965SQ-V0T pinout, L5965SQ-V0T application, or L5965SQ-V0T equivalent, this PMIC delivers deterministic power sequencing, fault-aware diagnostics (FAULT/RESET_B), multi-rail voltage supervision, and OTP-configurable startup behavior - critical for ADAS domain controllers requiring robust BOM reduction and safety-compliant supply architecture.

Technical Context

The L5965SQ-V0T implements a hierarchical power architecture: BUCK1 operates as a battery-compatible external-MOS controller (0.4 MHz, 0.8–5.0 V), while BUCK2–BUCK4 and BOOST use internal power switches with fixed 2.4 MHz operation (except BUCK2's dual-frequency mode). All regulators feature internal compensation networks, programmable soft-start, and spread-spectrum modulation to reduce EMI.

Functional safety is embedded at silicon level: independent band-gap references, differential current sensing (sensep/sensen), voltage supervisors with hysteresis, window watchdog (WDI), and fault reporting via open-drain FAULT pin. The SPI interface enables real-time configuration of over/under-voltage thresholds, slew rates, and diagnostic registers - supporting ISO 26262 ASIL-B/C system-level compliance.

Key Specifications

Pinout & Package

VFQFPN-48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin count: 48. Thermal resistance: R_{th j-a} = 26 °C/W (2s2pvias).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP81239MNTXG and TPS659412RWER, the L5965SQ-V0T uniquely combines OTP-configured safety-critical sequencing, integrated BOOST for CAN FD, and ±1% VREF - enabling single-chip compliance with ASIL-B/C requirements without external supervisory ICs or firmware dependencies.

Availability

L5965SQ-V0T is available at Aetrix Electronics and suitable for automotive radar ECUs, ADAS camera modules, domain controller power hubs, and infotainment SoC platforms requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for L5965SQ-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 headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and functional safety expertise.

The L5965 product line targets high-integrity automotive power systems - specifically engineered to replace discrete DC-DC solutions in radar, camera, and domain controller applications demanding ASIL-B/C compliance, minimal external components, and OTP-based deterministic configuration.

FAQ

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

VBAT1 and VBAT2 each support an absolute maximum rating of 42 V, with recommended operating range from –0.3 V to 32 V. During normal operation, the specified input range is 4 V to 14 V for optimal regulation and thermal performance. Exceeding 32 V risks permanent damage even if transient, as clamping is not provided on these pins.

Can the L5965SQ-V0T generate a 5.0 V BOOST output while supplying 3.3 V from BUCK4 simultaneously?

Yes. The BOOST regulator delivers 5.0 V at up to 0.3 A (or 7.0 V at 0.2 A), and BUCK4 independently supplies 3.3 V at up to 1.0 A - both operating at 2.4 MHz with phase shift (270°). No shared current paths or voltage coupling exist between them; each has dedicated power switches, feedback loops, and supervision circuits.

How is the power-up sequence programmed, and can it be modified after OTP programming?

The power-up sequence is configured exclusively via OTP memory cells during final test - defining enable timing, voltage ramps, and inter-rail dependencies. Once programmed, the sequence is immutable. Runtime adjustments (e.g., disabling individual rails) are possible via SPI commands, but the base sequence order and delays remain fixed per OTP settings.

Does the L5965SQ-V0T support synchronization with an external clock source?

Yes. The SYNCIN pin accepts a 1.8–2.76 MHz PWM signal to synchronize all 2.4 MHz regulators (BUCK3, BUCK4, BOOST). The SYNCOUT pin outputs either the internal 2.4 MHz oscillator or echoes the SYNCIN signal, enabling daisy-chain synchronization across multiple PMICs in distributed automotive architectures.