STMicroelectronics L99H01XP

Overview

L99H01XP from STMicroelectronics is an automotive-grade motor bridge driver IC designed to control four external N-channel MOSFETs in dual H-bridge configuration for DC-motor actuation. It operates from 6 V to 28 V, integrates a two-stage charge pump enabling 100% duty cycle operation down to 6 V supply, and features SPI-controlled diagnostics, programmable freewheeling, and differential current sense amplifiers with zero-adjust trimming-used in seat positioning and park brake systems.

For engineers reviewing the L99H01XP datasheet, L99H01XP pinout, L99H01XP application, or L99H01XP equivalent, this page delivers verified technical context, validated pin functions for PowerSSO-36, real-world automotive use cases, and confirmed alternative drivers with documented functional differences.

Technical Context

The L99H01XP implements dual independent half-bridge gate drivers (GH1/SL1 and GH2/SL2) with embedded cross-current protection (tCCP = 100 ns typical), drain-source monitoring, and thermal shutdown at 175 °C. Its central two-stage charge pump delivers regulated gate drive voltage up to 12.5 V for external high-side MOSFETs, supporting full R_DS(on) conduction even at 6 V input.

SPI interface (3.3 V/5 V compatible, up to 30 kHz PWM) provides read/write access to 4 application registers and a global status byte, enabling real-time fault reporting-including overvoltage (VS > 32 V), undervoltage (VS < 5.5 V), watchdog timeout, and thermal warning (150 °C). The TS/ACT_OFF pin supports either external thermal sensor interface or active-off command.

Key Specifications

Pinout & Package

Package: PowerSSO-36 (exposed slug, 10.2 mm × 10.2 mm × 1.75 mm), thermally optimized for high-power automotive motor drive with integrated ground slug connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar motor bridge driver applications.

Compared with TLE9201SG and VNH7040AS, the L99H01XP uniquely delivers dual H-bridge control with integrated current sensing, SPI-configurable freewheeling, and thermal warning-enabling ASIL-B-compliant seat and brake systems without adding external monitoring ICs.

Availability

L99H01XP is available at Aetrix Electronics and suitable for automotive seat positioning, electronic parking brake, and adaptive wiper systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for L99H01XP 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 specializing in automotive, industrial, and power management ICs, with broad portfolio certification to AEC-Q100 and ISO 26262 standards.

The L99H01XP belongs to ST's L99 family of automotive motor drivers, engineered specifically for safety-critical body electronics applications demanding integrated diagnostics, thermal resilience, and SPI-based system-level integration.

FAQ

What is the maximum continuous output current supported by L99H01XP?

The L99H01XP does not source current directly; it drives external N-channel MOSFETs. With recommended 8 mΩ R_DS(on) MOSFETs and proper PCB copper area (≥400 mm²), it supports ≥10 A RMS per half-bridge under 125 °C ambient, limited by thermal resistance (R_thj-amb = 25 °C/W for PowerSSO-36).

Does L99H01XP require external reverse battery protection?

Yes. The datasheet explicitly states "external reverse protection required" on the VS pin. However, the IC provides a dedicated control output to drive an external reverse-protection MOSFET, simplifying implementation versus discrete protection diodes or controllers.

Can L99H01XP operate with a 3.3 V microcontroller SPI interface?

Yes. All SPI pins (CSN, CLK, DI, DO) are 3.3 V/5 V tolerant. The DO output is VCC-compatible (3.3 V or 5 V), and internal logic levels meet CMOS thresholds for both voltages-no level-shifting circuitry is needed when interfacing with 3.3 V MCUs.

How is thermal sensor interfacing implemented on pin 21 (TS/ACT_OFF)?

Pin 21 functions as either a thermal sensor input (when EXT_TS bit = 1) accepting voltage from an external NTC or diode, or as an active-low emergency shutdown signal (EXT_TS = 0). The internal circuitry measures voltage drop across an external diode to derive junction temperature, with threshold detection at 150 °C and 175 °C.