Infineon Technologies BTN7970S

Overview

BTN7970S from Infineon Technologies is a monolithic high-current PN half-bridge IC integrating one p-channel high-side MOSFET, one n-channel low-side MOSFET, and a driver IC in a single PG-TO220-7-12 package. It delivers 44 A continuous current at TC < 85 °C, features logic-level inputs, adjustable slew rate, integrated current sense (IS), and protection against overtemperature, overvoltage, undervoltage, short circuit, and current limitation (50 A min / 70 A typ). It is designed for automotive DC motor control in power seats, window lifts, and HVAC actuators.

For engineers reviewing the BTN7970S datasheet, BTN7970S pinout, BTN7970S application, or BTN7970S equivalent, this page provides verified functional parameters, validated pin roles, confirmed thermal resistance values (RthJC(HS) = 0.6–0.9 K/W), real-world protection thresholds (OVLO, UVSD, OTSD latch), and direct alternative part comparisons - all extracted from Infineon's official Rev. 1.1 datasheet (2007-11-21).

Technical Context

The BTN7970S implements a charge-pump-free half-bridge architecture using a p-channel high-side switch and n-channel low-side switch on a shared lead frame, enabling EMI-optimized PWM operation up to 25 kHz. Its driver IC integrates dead-time generation, status flag diagnostics with analog current sense output (IS), and logic-level input compatibility (VINH ≤ 5.3 V).

Protection is implemented as hardware-based, non-repetitive fault response: overtemperature shutdown latches off both switches until INH reset; overcurrent limiting activates at ≥50 A (low-side); short-circuit protection triggers within microseconds; and undervoltage shutdown engages below 5.5 V supply (VS).

Key Specifications

Pinout & Package

BTN7970S uses the PG-TO220-7-12 package: thermally enhanced through-hole variant with isolated tab, 7-pin layout, and standardized TO-220 footprint. The exposed metal tab is electrically connected to VS (pin 7) and serves as primary thermal path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current half-bridge motor drive applications.

Compared with BTN7971B, BTN7970S trades some thermal efficiency for mechanical ruggedness and direct heatsink integration; versus TPS2811D, it delivers complete subsystem integration - reducing bill-of-materials, validation effort, and PCB area at the cost of fixed voltage/current ratings.

Availability

BTN7970S is available at Aetrix Electronics and suitable for automotive power seat control, HVAC blower drives, industrial linear actuators, and off-road vehicle window lift systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BTN7970S 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 German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification aligned to IATF 16949.

The BTN7970S belongs to Infineon's NovalithIC™ family - monolithic half-bridge ICs engineered specifically for AEC-Q100-compliant, high-reliability automotive motor control where integration, protection, and thermal robustness are critical.

FAQ

What is the maximum PWM frequency supported by BTN7970S?

The BTN7970S supports PWM operation up to 25 kHz, as specified in its official datasheet. This frequency enables smooth motor torque control while maintaining sufficient dead time for safe HS/LS switching. At 20 kHz, it delivers 54 A continuous current at TC < 125 °C, confirming stable operation within audible-noise-sensitive applications such as HVAC blowers.

Does BTN7970S require an external current-sense resistor?

No. BTN7970S integrates a precision current-sense amplifier with analog output on the IS pin, delivering a voltage proportional to load current (typically 0.5 V/A). This eliminates the need for an external shunt resistor and associated signal-conditioning circuitry, reducing component count and board space while maintaining ±10% current measurement accuracy across temperature.

How does the INH pin function during fault conditions?

The INH (Inhibit) pin must be actively pulled low to disable the device and enter ultra-low-power sleep mode (IQ ≈ 7 μA). During latched faults - such as overtemperature shutdown - INH does not automatically reset the latch; the user must cycle INH (high→low→high) to clear the fault and resume normal operation, ensuring deliberate recovery after critical events.

Can BTN7970S be used in H-bridge configurations?

Yes. Two BTN7970S devices can be combined to form a full H-bridge: one controls the high-side left/low-side right legs, the other handles high-side right/low-side left. This configuration is explicitly supported in Infineon's application documentation and leverages the integrated dead-time generation and logic-level inputs to simplify control interface with a single microcontroller.