Infineon Technologies S6BP401AL2SN1B00A

Overview

S6BP401AL2SN1B00A from Infineon Technologies (formerly Cypress) is an AEC-Q100 Grade-1 automotive power management IC for ADAS platforms, integrating quad 2.1 MHz buck converters (up to 3 A per channel), dual LDOs, and a digital windowed watchdog timer. It supports input voltage ranges of 4.5–5.5 V for bucks and 2.97–5.5 V for LDOs, delivers preset output voltages from 1.00 V to 3.40 V across six regulated rails, and operates in camera systems and radar modules requiring high transient response and functional safety monitoring.

For engineers reviewing the S6BP401AL2SN1B00A datasheet, S6BP401AL2SN1B00A pinout, S6BP401AL2SN1B00A application, or S6BP401AL2SN1B00A equivalent, key selection criteria include its quad-buck + dual-LDO architecture, built-in current-mode control, integrated soft-start and discharge resistors, AEC-Q100 qualification, and watchdog timer with windowed reset behavior - all in a 6 mm × 6 mm QFN-40 package.

Technical Context

The S6BP401AL2SN1B00A implements current-mode control across all four buck regulators, enabling fast load transient response and stable operation without external compensation components. Each buck channel features independent enable, power-good monitoring, and over-current/over-voltage/thermal protection with programmable thresholds.

Its dual LDOs operate from a shared 2.97–5.5 V input and provide fixed or resistor-programmable outputs up to 0.5 A total; the integrated windowed watchdog accepts external trigger pulses and asserts a system reset if timing deviates beyond ±10% of the nominal window - critical for ISO 26262 ASIL-B–capable ADAS subsystems.

Key Specifications

Pinout & Package

Package: 6 mm × 6 mm QFN-40 with exposed thermal pad (EP), four corner pads (CP1–CP4), and 40-pin layout optimized for thermal dissipation and EMI control in automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NXP FS4500 and Renesas ISL78234, S6BP401AL2SN1B00A uniquely integrates both LDOs and a windowed watchdog in a single AEC-Q100 Grade-1 package - reducing component count and simplifying functional safety architecture for ADAS camera and radar modules.

Availability

S6BP401AL2SN1B00A is available at Aetrix Electronics and suitable for automotive radar sensors, ADAS camera ECUs, parking assist controllers, and driver monitoring systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant power delivery.

Supply support for S6BP401AL2SN1B00A 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

Infineon Technologies is a global semiconductor leader specializing in power management, automotive, and industrial solutions, with deep expertise in functional safety and high-reliability analog ICs.

The S6BP401AL2SN1B00A belongs to Infineon's automotive PMIC portfolio designed specifically for ADAS domain controllers and camera/radar modules requiring integrated power sequencing, monitoring, and safety-critical watchdog functionality.

FAQ

What is the maximum supported switching frequency for S6BP401AL2SN1B00A?

The S6BP401AL2SN1B00A supports an external clock mode ranging from 1.8 MHz to 2.4 MHz, with a typical internal oscillator frequency of 2.1 MHz. This high-frequency operation allows use of smaller inductors and capacitors, reducing solution size and improving transient response in space-constrained ADAS modules.

How does the windowed watchdog timer function in this PMIC?

The watchdog timer requires periodic trigger pulses on the WDI pin within a defined time window. If a pulse arrives too early or too late - exceeding ±10% of the nominal window - the RST pin asserts an active-low reset signal. This windowed behavior prevents false resets from jitter and detects both software hangs and timing violations.

Can the output voltages of the buck converters be adjusted externally?

Yes - each buck converter (DD1–DD4) has a dedicated FB pin that accepts external resistor dividers to set output voltage anywhere within its specified range (e.g., 1.00–1.275 V for DD2). Factory-preset values are also available, eliminating external resistors when standard voltages meet design requirements.

Is thermal management supported through the package design?

Yes - the QFN-40 package includes an exposed thermal pad (EP) that must be soldered to the PCB ground plane. Combined with internal thermal shutdown (TSD) activation at +150 °C, this design enables reliable operation up to +125 °C ambient in automotive under-hood and ADAS module environments.