Toshiba Semiconductor and Storage TB67S158FTG,EL

Overview

TB67S158FTG from Toshiba is a constant-voltage-control DMOS stepper motor driver IC capable of driving up to two 2-phase unipolar stepping motors simultaneously. It features dual interface modes (full parallel and serial/parallel), 80 V output voltage rating, 1.5 A maximum output current per phase, and integrated thermal shutdown (TSD), overcurrent detection (ISD), and VM power-on reset (POR). It is used in precision motion control systems such as industrial automation actuators and optical positioning stages.

For engineers reviewing the TB67S158FTG datasheet, TB67S158FTG pinout, TB67S158FTG application, or TB67S158FTG equivalent, key selection considerations include its BiCD-process low R_DS(on) (0.5 Ω typ.), dual-mode interface flexibility, built-in VCC regulator enabling single-supply operation, and open-drain ALERT/ERR/ALM fault signaling for system-level diagnostics.

Technical Context

The TB67S158FTG implements a dual-channel architecture with four independent half-bridge outputs per motor (A/B/C/D phases), supporting both full-parallel direct transistor-array-style control and serial/parallel conversion via an 8-bit shift + storage register. Its internal VCC regulator allows operation from a single VM supply (10–60 V), eliminating need for external logic rail.

Protection is implemented through three independent circuits: ISD triggers at ≥3.0 A (typ.) per channel with 2.0 μs blanking time; TSD activates at junction temperature ≥160 °C (typ.) with automatic recovery upon cooling; and VMR monitors VM supply, asserting POR when VM drops below 8.0 V (typ.). All protections assert open-drain ERR or ALM signals.

Key Specifications

Pinout & Package

Packaged in a thermally enhanced P-WQFN48-0707-0.50-003 (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad requiring PCB GND connection at all four corners and center pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB67S158FTG, TB6600HG delivers higher drive capability but sacrifices integration and diagnostics, while DRV8834 offers microstepping and footprint reduction at the cost of autonomous protection and voltage range-making TB67S158FTG optimal for mid-power, reliability-critical industrial motion control.

Availability

TB67S158FTG is available at Aetrix Electronics and suitable for industrial CNC actuators, optical positioning stages, medical infusion pumps, and automated laboratory analyzers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TB67S158FTG 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor solutions for automotive, industrial, and consumer applications, with leadership in power management and motor control ICs.

The TB67S158FTG belongs to Toshiba's Bi-CD Process DMOS stepper driver family, engineered specifically for compact, high-efficiency unipolar motor control in space- and reliability-constrained embedded systems.

FAQ

What interface modes does the TB67S158FTG support, and how is mode selection configured?

The TB67S158FTG supports two interface modes: full parallel (Mode1) and serial/parallel conversion (Mode2). Mode selection is controlled by the MODE pin (pin 26): logic low (≤0.8 V) selects full parallel mode, where IN_A1–IN_D2 directly control individual output transistors; logic high (≥2.0 V) selects serial mode, where pins repurpose as DATA, CLK, CLR, LATCH, etc. The MODE pin must be hard-wired and not dynamically switched during operation. Both modes retain identical output capabilities and protection features.

How does the TB67S158FTG handle thermal protection, and what happens when thermal shutdown activates?

When the TB67S158FTG junction temperature reaches ~160 °C (typ.), its thermal shutdown circuit (TSD) disables all output transistors and asserts the ERR pin low. The ALM pin also goes low if TSD is active in serial mode. Recovery occurs automatically once the die cools by ~30 °C below the threshold (i.e., to ~130 °C), provided VM remains applied or STBY is asserted. During TSD, the internal logic remains powered, allowing continued monitoring via ERR/ALM. The exposed thermal pad and proper PCB copper pour are essential for effective heat dissipation.

Can the TB67S158FTG drive two independent unipolar stepper motors simultaneously, and what are the wiring requirements?

Yes, the TB67S158FTG can drive two independent 2-phase unipolar stepper motors concurrently-one using phases A/B (VCOM_AB, OUT_A±, OUT_B±) and the other using C/D (VCOM_CD, OUT_C±, OUT_D±). Each motor requires its own center-tap connection to the respective VCOM pin. PGND_AB and PGND_CD must be routed separately to minimize crosstalk, while LGND connects to system logic ground. Motor windings connect between corresponding OUT+ and OUT− pins, with VCOM tied to VM via appropriate current-limiting or regulation per motor.

What is the purpose of the ERR and ALM pins, and how should they be interfaced with a host MCU?

ERR is an open-drain output that goes low during either thermal shutdown (TSD) or overcurrent detection (ISD); ALM is an open-drain output active only during TSD (available in serial mode). Both require external 3.3 V or 5 V pull-up resistors (typically 10 kΩ). The host MCU monitors these pins as active-low interrupt or status inputs. ERR provides consolidated fault indication, while ALM enables differentiated thermal alarm handling-e.g., initiating fan control or reducing motor load before full TSD shutdown. Neither pin drives high actively; they only sink current when asserted.

Does the TB67S158FTG require an external logic supply, and how is its internal regulator configured?

No, the TB67S158FTG does not require an external logic supply. It integrates a VCC regulator that derives 5 V logic power directly from the VM motor supply (10–60 V). This eliminates the need for a separate 5 V rail and simplifies system power architecture. The regulator operates across the full VM range and powers all internal logic, shift registers, and protection circuits. No external components are required-only proper decoupling (e.g., 10 μF ceramic + 100 nF near VM pin) is recommended per Toshiba's layout guidelines.