Infineon Technologies S6BP401AY1SN1B000

Overview

S6BP401AY1SN1B000 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 operates from 4.5–5.5 V input, delivers preset output voltages including 1.20–1.575 V/2 A (DD1), 1.00–1.275 V/3 A (DD2), 1.20–2.575 V/2 A (DD3), and 3.3–3.4 V/1 A (DD4), and supports camera system power sequencing.

For engineers reviewing the S6BP401AY1SN1B000 datasheet, S6BP401AY1SN1B000 pinout, S6BP401AY1SN1B000 application, or S6BP401AY1SN1B000 equivalent, key selection criteria include its integrated FETs enabling 2.4 MHz switching, load-independent soft-start, independent enable control per rail, power-good monitoring per regulator, and thermal/overcurrent/overvoltage protection in a 6 mm × 6 mm QFN-40 package.

Technical Context

The S6BP401AY1SN1B000 employs current-mode control architecture across all four buck channels, delivering fast transient response and stable regulation under dynamic load conditions. Each buck converter integrates high-side and low-side MOSFETs rated for up to 3 A continuous output current and supports both internal (2.0–2.2 MHz) and external clock synchronization (1.8–2.4 MHz).

The dual LDOs accept 2.97–5.5 V input and provide fixed or resistor-programmable outputs with built-in voltage-setting resistors; the integrated windowed watchdog timer features WDI trigger input and RST reset output with configurable timeout windows, and all regulators include independent enable pins, power-good flags, and discharge resistors.

Key Specifications

Pinout & Package

Package: 6 mm × 6 mm, 40-pin QFN with exposed thermal pad (EP) and four corner pads (CP1–CP4), RoHS-compliant, AEC-Q100 Grade-1 qualified.

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 S6BP401AY1SN1B000 uniquely combines quad buck capability, dual LDOs, and watchdog in a compact QFN-40 package with 2.1 MHz operation - optimizing board area, component count, and startup timing for ADAS camera ECUs.

Availability

S6BP401AY1SN1B000 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, radar processing units, and driver monitoring systems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for S6BP401AY1SN1B000 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 focused on power systems, automotive electronics, and security solutions, with deep expertise in high-reliability analog and mixed-signal ICs.

The S6BP401AY1SN1B000 belongs to Infineon's automotive PMIC portfolio designed specifically for advanced driver assistance systems, emphasizing integration, functional safety, and AEC-Q100 Grade-1 robustness in harsh automotive environments.

FAQ

What is the maximum allowable input voltage for the S6BP401AY1SN1B000 buck converters?

The absolute maximum input voltage for the buck converters (PVCC1–PVCC4) is 6.0 V, but the recommended operating range is 4.5 V to 5.5 V. Operation above 5.5 V risks violating the 6.0 V absolute maximum rating and may trigger overvoltage protection or cause permanent damage. Automotive battery transients must be clamped externally if exceeding this limit.

Can the S6BP401AY1SN1B000 operate without external feedback resistors?

Yes - the device includes internal resistor dividers enabling preset output voltages (e.g., 1.20 V, 1.80 V, 3.30 V) without external components. External resistors are only required when custom output voltages outside the factory-preset ranges are needed, and the FB pins must be properly terminated in either configuration.

How does the windowed watchdog timer function without external components?

The watchdog uses an internal oscillator and digital logic to monitor pulse intervals on the WDI pin. If pulses fall outside the programmed window (e.g., too early or too late), RST asserts low. No external RC network or crystal is required - timing is set via internal registers accessible through I²C or hardware strapping options defined in the datasheet.

Is the exposed pad (EP) electrically connected to ground internally?

Yes - the exposed pad is internally connected to the GND net and must be soldered to a solid PCB ground plane for thermal dissipation and electrical stability. Thermal resistance drops from 65 °C/W (no pad connection) to 32 °C/W (fully connected), and floating the pad violates AEC-Q100 thermal test requirements.