STMicroelectronics L5956PDTR

Overview

L5956PDTR from STMicroelectronics is a multifunction voltage regulator IC for automotive car radio systems, integrating four regulated outputs (8.5 V/500 mA, 5 V/300 mA permanent, 5 V/800 mA, 3.3 V/800 mA), a 2 A high-side power switch, ignition comparator, reset buffer, load dump protection, and thermal shutdown. It operates across -40 °C to +85 °C with <100 µA standby quiescent current and PowerSO20 (slug-up) packaging.

For engineers reviewing the L5956PDTR datasheet, L5956PDTR pinout, L5956PDTR application, or L5956PDTR equivalent, this device serves as a single-chip power management solution for infotainment head units requiring multiple rail sequencing, battery monitoring, backup hold, and robust overvoltage/overcurrent protection in 12 V automotive environments.

Technical Context

The L5956PDTR integrates three linear regulators and one low-dropout regulator alongside a protected high-side driver, all sharing common input monitoring circuitry including an ignition buffer with Schmitt-trigger hysteresis (1.17–1.27 V rising threshold) and hold logic with dual VIN1 thresholds (9.5 V low-detect, 20 V high-detect). Its reset buffer provides push-pull output with 4.7–4.95 V rising threshold and 10–60 ms programmable delay via external capacitor.

Regulator outputs are independently enabled via a shared ENIN pin (1.3–2.3 V threshold), and the power switch features peak-current limiting (2–3.5 A for <15 ms, 1–2 A sustained), 0.5 V max drop at 1.8 A, and integrated short-circuit protection with 15–40 ms delay. All regulators include ±50 mV line/load regulation and ≥50 dB PSRR at 1 kHz.

Key Specifications

Pinout & Package

Package: PowerSO20 (slug-up), thermally enhanced surface-mount package with exposed die attach pad on underside for direct PCB heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction automotive power regulator applications.

Compared with TLE4271-2G and UC2843BD1R2G, the L5956PDTR uniquely combines four precision regulators, a protected high-side driver, and automotive-specific monitoring in one PowerSO20 package-reducing total solution size by >60% and eliminating six external components required by alternatives.

Availability

L5956PDTR is available at Aetrix Electronics and suitable for automotive infotainment systems, car radio head units, and telematics control units requiring stable component supply, AEC-Q100-compliant operation, and long-term lifecycle support.

Supply support for L5956PDTR 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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The L5956PDTR belongs to ST's automotive power management IC portfolio, engineered specifically for infotainment subsystems requiring integrated multi-rail regulation, battery monitoring, and load driving in harsh 12 V vehicle electrical environments.

FAQ

What is the maximum allowable input voltage transient for L5956PDTR?

The L5956PDTR withstands up to 50 V transient voltage on both VIN1 and VIN2 pins per ISO 7637-2 Pulse 5a, confirmed in Table 2 (Absolute Maximum Ratings) of the official ST datasheet (Doc ID 13852 Rev 4). This eliminates need for external TVS diodes in standard automotive load dump scenarios.

Can the 3.3 V regulator (REG4) power a 3.3 V microcontroller core directly?

Yes - REG4 delivers 3.3 V ±4.5% (3.15–3.45 V) at up to 800 mA with ≤100 mV load regulation and ≥50 dB PSRR at 1 kHz, meeting typical ARM Cortex-M core requirements. Its 2.5 V dropout at full load requires VIN2 ≥ 5.8 V under worst-case conditions.

How is reset timing configured on the L5956PDTR?

Reset delay is set externally via capacitor C_RES connected between RESET pin and GND. With C_RES = 47 nF, delay ranges from 10–60 ms (Table 4); timing scales linearly with capacitance. The internal charge/discharge current sources (3–10 µA charge, 1–3 mA discharge) define the ramp rate.

Does L5956PDTR support independent enable control for each regulator?

No - all four regulators and the high-side switch share a single ENIN pin with 1.3–2.3 V logic threshold. There is no per-rail enable; sequencing must be achieved via external timing or by controlling ENIN with a microcontroller GPIO using appropriate voltage translation if needed.