Infineon Technologies BTS5576G

Overview

BTS5576G from Infineon Technologies is a five-channel high-side smart power switch in P-DSO-36 package, designed for automotive exterior lighting control. It supports configurable bulb/LED mode per channel, features SPI-based diagnosis with 2 MHz max clock, multiplexed proportional current sense (kILIS configurable), and integrated limp-home activation via LHI pin. Used in tail lights, stop lights, and rear fog lights.

For engineers reviewing the BTS5576G datasheet, BTS5576G pinout, BTS5576G application, or BTS5576G equivalent, key selection criteria include channel-specific R_DS(on) values (25–90 mΩ), LED-mode fast diagnosis (<2% duty cycle at 100 Hz), SPI daisy-chain capability, and load-type configuration without external hardware changes.

Technical Context

The BTS5576G integrates five independent high-side switches with dedicated gate drivers, charge pump, and clamping circuitry for inductive loads. Each channel includes thermal shutdown with latch, short-circuit protection, multi-step current limitation, and loss-of-ground detection - all monitored and reported via an 8-bit SPI interface.

It implements a trigger state machine served over SPI, supports CMOS-compatible parallel PWM inputs per channel, and routes all five load current sense signals through a single multiplexer to one diagnosis pin (IS). The device operates from 4.5–28 V V_BB and 3.8–5.5 V V_DD, with overvoltage protection up to 41 V.

Key Specifications

Pinout & Package

Packaged in P-DSO-36 (exposed pad, RoHS-compliant), thermally enhanced for automotive under-hood mounting. Pin count: 36 terminals, including 5 high-side outputs (OUT0–OUT4), 5 parallel inputs (IN0–IN4), SPI interface (SI/SO/SCLK/CS), IS (multiplexed current sense), LHI (limp-home input), and power/ground rails.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side automotive lighting switch applications.

Compared with BTS5590G, BTS5576G trades watchdog functionality for lower system cost and smaller footprint; compared with BTS5566G, it adds LED support and faster diagnostics - making it optimal for mixed-load, mid-tier automotive lighting modules requiring scalability but not full ASIL-B certification.

Availability

BTS5576G is available at Aetrix Electronics and suitable for rear fog light control, tail/stop light management, indicator flasher interfaces, and CHMSL/parking light control requiring stable component supply across automotive production cycles.

Supply support for BTS5576G 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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global manufacturing and R&D centers.

The SPOC (Smart Power Octal/Quintuple) product line targets intelligent, protected high-side switching for automotive exterior lighting - balancing integration, diagnostic depth, and thermal robustness for 12 V grounded-load architectures.

FAQ

What load types does BTS5576G support, and how is mode selection implemented?

BTS5576G supports both incandescent bulbs (5–27 W) and LED loads via a single SPI register (LED_MODE bit). When enabled, it adjusts current sense ratio (kILIS), fault detection thresholds, and timing parameters to match LED electrical behavior - eliminating need for external hardware reconfiguration or dual-BOM strategies.

How does the multiplexed current sense (IS) pin function across five channels?

The IS pin outputs an analog voltage proportional to the selected channel's load current, routed through an internal multiplexer. Channel selection is controlled via SPI address bits (CH[2:0]). This design reduces PCB routing complexity and allows reuse of a single ADC input on the host microcontroller for all five channels' diagnostics.

Is BTS5576G compatible with daisy-chained SPI configurations, and what is the maximum supported chain length?

Yes - BTS5576G supports true daisy-chain SPI using SI/SO pins. Each device shifts out its status data while shifting in new commands. Chain length is limited only by signal integrity and timing margins; Infineon validates up to 8 devices in series at 2 MHz with standard PCB layout practices and proper termination.

Does BTS5576G require external components for basic operation, and which protections are fully integrated?

No external components are required for core switching and protection. Integrated functions include reverse-battery protection (with external FET), short-circuit/overload protection, multi-step current limitation, thermal shutdown with latch, overvoltage clamping (41 V), and loss-of-ground detection. Only the limp-home capacitor (if used for timing) and optional watchdog components are external.