STMicroelectronics L99H02QFTR

Overview

L99H02QFTR from STMicroelectronics is an AEC-Q100 qualified automotive H-bridge gate driver designed to control four external N-channel MOSFETs in DC motor applications. It operates from 6 V to 28 V, supports PWM up to 30 kHz, integrates a configurable current sense amplifier with zero-adjust trimming, and features SPI-based diagnostics and programmable freewheeling for wiper and seat positioning systems.

For engineers reviewing the L99H02QFTR datasheet, L99H02QFTR pinout, L99H02QFTR application, or L99H02QFTR equivalent, key selection criteria include its dual-supply architecture (VS/VCC), thermal sensor interface (TS/ACT_OFF), charge pump output (CP) for reverse-battery NMOS protection, and integrated drain-source monitoring for short-circuit detection in safety-critical automotive subsystems.

Technical Context

The L99H02QFTR implements a two-stage central charge pump enabling full R_DS(on) drive down to 6 V supply, supporting standard-level threshold MOSFETs without external bootstrap circuitry. Its SPI interface (CLK, DI, DO, CSN) enables real-time configuration of cross-current protection time, freewheeling mode, and diagnostic reporting via a 32-bit status register map.

It integrates dual half-bridge gate drivers (GH1/GL1, GH2/GL2) with independent source/drain monitoring (SH1/SL1, SH2/SL2), thermal shutdown at 175 °C, and a multiplexed current sense amplifier (CSI1±/CSI2±) with programmable gain and offset trimming - all coordinated through a watchdog-monitored serial command protocol.

Key Specifications

Pinout & Package

L99H02QFTR uses the LQFP32 package (7 mm × 7 mm, 0.8 mm pitch) with exposed thermal pad. Pin 1 is located at top-left corner; pin numbering proceeds counterclockwise. The package supports reflow soldering and provides robust thermal performance (R_thj-amb = 45 °C/W with 20 cm² copper pour).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge gate driver applications.

Compared with TLE9201SG and DRV8876-Q1, the L99H02QFTR uniquely combines dual external-MOSFET H-bridge control, programmable current sensing, thermal sensor interface, and charge pump output - making it the only option among the three that supports ASIL-B-compliant, high-power, thermally monitored automotive actuators with field-serviceable MOSFET replacement.

Availability

L99H02QFTR is available at Aetrix Electronics and suitable for automotive wiper systems, power seat positioning, seat belt tensioners, and electric park brake modules requiring stable component supply across extended vehicle lifecycles and stringent environmental qualification.

Supply support for L99H02QFTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive-grade analog, power, and microcontroller solutions with broad AEC-Q100 product coverage.

The L99H02 belongs to ST's automotive power driver portfolio, engineered specifically for electromechanical actuation in body electronics - emphasizing functional safety, thermal resilience, and diagnostic completeness for ASIL-B systems.

FAQ

What is the purpose of the TS/ACT_OFF pin?

The TS/ACT_OFF pin serves a dual function: when configured as thermal sensor input (EXT_TS-bit = high), it reads analog voltage from external NTC/PTC sensors on MOSFETs; when set to active-off mode (EXT_TS-bit = low), it forces all gate drivers into sink condition for immediate system shutdown - enabling both predictive thermal management and hard fault isolation.

Does L99H02QFTR support 3.3 V or 5 V logic levels?

Yes - L99H02QFTR accepts both 3.3 V and 5 V logic levels on VCCD (digital supply) and VCC (analog supply). All digital I/O pins (EN, DIR, PWM, CSN, CLK, DI, DO) are CMOS-compatible with internal pull-up/down resistors, eliminating external level-shifting components for either voltage domain.

How does the charge pump operate below 10 V supply?

The central 2-stage charge pump maintains gate drive voltage ≥10 V even when VS drops to 6 V, enabling full R_DS(on) operation of standard-threshold N-channel MOSFETs. CP output delivers regulated ~10 V to external reverse-battery NMOS, while CP1±/CP2± pins connect discrete pump capacitors for stability and ripple suppression.

Can the current sense amplifier measure both motor phases simultaneously?

No - the current sense amplifier is single-ended but multiplexed: CSI1± and CSI2± inputs allow sequential sampling of two shunt resistors (e.g., high-side and low-side of one H-bridge leg), with gain and offset configured per channel via ApplReg1 and ApplReg2. Simultaneous dual-phase measurement requires external hardware multiplexing.