Infineon Technologies S6BP401AL3SN1B200

Overview

S6BP401AL3SN1B200 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 (buck) and 2.97–5.5 V (LDO), delivers preset output voltages from 1.00 V to 3.40 V, and operates in a 6 mm × 6 mm QFN-40 package.

For engineers reviewing the S6BP401AL3SN1B200 datasheet, S6BP401AL3SN1B200 pinout, S6BP401AL3SN1B200 application, or S6BP401AL3SN1B200 equivalent, key selection criteria include multi-rail sequencing capability, integrated FETs enabling >90% efficiency at 2.1 MHz, windowed WDT for safety-critical reset supervision, and AEC-Q100 qualification for camera ECU and radar module power domains.

Technical Context

The S6BP401AL3SN1B200 employs current-mode control architecture across all four buck regulators, enabling fast load transient response (<10 µs recovery for 50% step load) and stable operation without external compensation. Each buck channel features independent enable, power-good monitoring, and built-in discharge resistors for controlled rail shutdown.

Its dual LDOs operate with low dropout (≤150 mV at 200 mA), while the windowed watchdog timer accepts trigger pulses within programmable time windows (±10% tolerance) and asserts RST on timeout or out-of-window events-critical for ISO 26262 ASIL-B compliant systems.

Key Specifications

Pinout & Package

Package: 6 mm × 6 mm QFN-40 with exposed thermal pad (EP) and four corner pads (CP1–CP4), all requiring connection to PCB ground plane for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4436-AEC1 and TPS65381A-Q1, the S6BP401AL3SN1B200 uniquely integrates four high-current bucks, dual LDOs, and a safety-certifiable windowed watchdog in a single AEC-Q100 Grade-1 package-enabling full ADAS domain controller power delivery without supplemental ICs.

Availability

S6BP401AL3SN1B200 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, radar sensor units, instrument clusters, and central gateway controllers requiring stable component supply across extended temperature and long product lifecycles.

Supply support for S6BP401AL3SN1B200 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 systems, automotive electronics, and security solutions, with headquarters in Munich, Germany.

The S6BP401AL3SN1B200 belongs to Infineon's automotive PMIC portfolio, designed specifically to consolidate power delivery and functional safety monitoring for next-generation ADAS domain controllers and zonal architectures.

FAQ

What is the maximum allowable input voltage for the S6BP401AL3SN1B200 buck converters?

The absolute maximum input voltage for all four buck converters (DD1–DD4) is 6.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Exceeding 5.5 V risks triggering overvoltage protection and may cause permanent damage if sustained beyond 100 ms. The UVLO threshold is set at 4.2 V (typical), ensuring reliable startup from automotive battery rails.

Can the S6BP401AL3SN1B200's watchdog timer be disabled?

No, the windowed watchdog timer cannot be disabled via pin or register; it remains active whenever VCC is powered. However, the WDI input can be held static (high or low) to prevent timeout assertion-though this violates functional safety requirements. For ASIL-B compliance, continuous valid pulse trains must be supplied to WDI at the configured window frequency.

How does the S6BP401AL3SN1B200 handle power sequencing between its four buck outputs?

Each buck channel has independent enable pins (EN1–EN4), allowing full hardware-controlled sequencing with external timing circuits or MCU GPIO. No internal sequencing logic exists-the device relies on external control to meet specific ramp-up order requirements (e.g., core before I/O). Power-good outputs (PG1–PG4) provide status feedback for closed-loop sequencing.

Is the S6BP401AL3SN1B200 compatible with standard QFN reflow profiles?

Yes, the S6BP401AL3SN1B200 complies with IPC/JEDEC J-STD-020D moisture sensitivity level 3 and supports standard lead-free reflow profiles (peak 260 °C, 20–40 s above 217 °C). The exposed thermal pad must be soldered to a minimum 12 mm² copper area with ≥4 thermal vias to ensure junction temperature stays below 125 °C at full load.