Toshiba Semiconductor and Storage TB67S512FTAG,EL

Overview

TB67S512FTAG from Toshiba Electronic Devices & Storage Corporation is a monolithic BiCD-process two-phase bipolar stepping motor driver with integrated PWM chopper and CLK-in decoder. It delivers 40 V/2.0 A rated drive capability, supports full/half/quarter-step resolution, and features built-in thermal shutdown (TSD), over-current detection (ISD), and power-on reset (POR) for industrial motion control systems.

For engineers reviewing the TB67S512FTAG datasheet, TB67S512FTAG pinout, TB67S512FTAG application, or TB67S512FTAG equivalent, key selection considerations include its 0.8 Ω (typ.) total output ON-resistance, 70–150 kHz configurable chopping frequency, 10–35 V VM operating range, and P-WQFN36-0606-0.50-002 package with 36-pin layout optimized for thermal management in compact motor drive modules.

Technical Context

The TB67S512FTAG implements a mixed-decay PWM current control architecture with three operational modes-charge, slow decay, and fast decay-dynamically selected per step cycle to maintain precise constant-current regulation. Its internal oscillator (OSCM) sets chopper frequency via external RC components, enabling tuning between 40–150 kHz to balance current ripple and thermal performance.

Control logic accepts asynchronous CLK edges to advance electrical angle, uses DMODE1/DMODE2 pins to configure step resolution (full/half/quarter/standby), and employs CW/CCW and ENABLE inputs to manage rotation direction and output enable state. Current sensing is performed through dual RS pins (RSA/RSB), each feeding independent comparators referenced to VREFA/VREFB voltage settings.

Key Specifications

Pinout & Package

Package: P-WQFN36-0606-0.50-002 - 6 mm × 6 mm, 0.5 mm pitch, exposed thermal pad, 36-pin quad flat no-lead with bottom-side thermal slug for PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN820 and MP6500, the TB67S512FTAG uniquely combines hardware-configurable step resolution, real-time electrical angle monitoring (MO), and CLK-in simplicity-making it optimal for deterministic, low-latency motion control without host processor involvement in step timing.

Availability

TB67S512FTAG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump drive, automotive HVAC actuator, and lab automation robotic arm joint applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TB67S512FTAG 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 high-reliability analog, power, and motor control ICs for industrial, automotive, and consumer applications, with emphasis on robustness and system-level integration.

The TB67S512FTAG belongs to Toshiba's TB67S series of integrated stepper drivers, engineered specifically for compact, thermally constrained motion systems needing precise current regulation, hardware-based step control, and autonomous fault protection.

FAQ

What is the maximum continuous output current supported by the TB67S512FTAG under typical operating conditions?

The TB67S512FTAG supports 1.2 A (typical) continuous output current at Ta = 25°C with proper PCB thermal design. This value is derived from its 0.8 Ω (typ.) total output ON-resistance and thermal limits specified in the datasheet. Actual usable current depends on ambient temperature, copper area, and airflow; thermal calculation is required to ensure junction temperature remains below 120°C. The TB67S512FTAG absolute maximum rating is 2.0 A, but sustained operation above 1.2 A risks thermal shutdown activation.

How does the TB67S512FTAG implement current regulation, and what external components are required?

The TB67S512FTAG uses PWM chopper-based constant-current regulation controlled by internal comparators referencing VREFA/VREFB voltages and sensing motor current via RSA/RSB pins. External components required include two low-inductance current-sense resistors (e.g., 0.51 Ω), VREF-setting voltage sources (0.5–3.6 V), and an RC network on OSCM to set chopping frequency. No external gate drivers or discrete MOSFETs are needed-the TB67S512FTAG integrates all power stages.

Can the TB67S512FTAG operate with a 3.3 V logic supply while driving a 24 V motor rail?

Yes, the TB67S512FTAG supports 3.3 V logic inputs: VIN(H) minimum is 2.0 V and VIN(L) maximum is 0.8 V, making it fully compatible with standard 3.3 V microcontrollers. Its VM rail operates independently from 10–35 V, so 24 V motor supply is within specification. The internal VCC regulator powers logic circuitry from VM, eliminating need for separate 5 V supply-though VCC pin can be monitored externally for system health checks.

What protection features are built into the TB67S512FTAG, and how are they signaled to the system?

The TB67S512FTAG integrates thermal shutdown (TSD), over-current detection (ISD), and power-on reset (POR). Both TSD and ISD assert fault conditions on the open-drain MO pin, which must be pulled up externally. When active, MO goes low to indicate error state. These protections operate autonomously-no host intervention required-and force the device into standby until VM is cycled or DMODE pins are reconfigured. Fault thresholds are fixed: TSD triggers at 145–175°C; ISD at 2.5–4.0 A.

Is the TB67S512FTAG pin-compatible with other Toshiba stepper drivers like the TB67S109AFNG?

No, the TB67S512FTAG is not pin-compatible with the TB67S109AFNG. They differ in package (P-WQFN36 vs. P-VQFN48), pin count (36 vs. 48), pin functions (e.g., TB67S512FTAG has dual RSA/RSB and VREFA/VREFB, while TB67S109AFNG uses single REF pin), and control architecture (CLK-in vs. STEP/DIR). Substitution requires PCB redesign and firmware adaptation. Always verify pin mapping, thermal pad layout, and decoupling requirements before replacement.