Toshiba Semiconductor and Storage TB67S101AFTG,EL

Overview

TB67S101AFTG from Toshiba Electronic Devices & Storage Corporation is a two-phase bipolar stepping motor driver IC using PWM chopper control with PHASE-in interface, rated for 50 V/4.0 A operation and fabricated in BiCD silicon monolithic process. It delivers full/half/quarter-step resolution, supports up to 400 kHz PHASE input frequency, and integrates Advanced Dynamic Mixed Decay (ADMD) for high-efficiency current regulation in industrial motion control systems.

For engineers reviewing the TB67S101AFTG datasheet, TB67S101AFTG pinout, TB67S101AFTG application, or TB67S101AFTG equivalent, key selection considerations include its 0.49 Ω (typ.) total output ON-resistance, 70 kHz typical chopper frequency, thermal shutdown at 145–175 °C, and QFN48 package with exposed thermal pad requiring single-point GND termination.

Technical Context

The TB67S101AFTG implements a dual H-bridge output stage with MOSFETs controlled by a PHASE/STEP logic interface and internal oscillator-based PWM chopping. Its ADMD current control dynamically mixes fast and slow decay modes based on real-time current error detection against VREF-set thresholds, minimizing ripple while optimizing power dissipation.

It features integrated protection including thermal shutdown (TSD), over-current shutdown (ISD), and power-on reset (POR), alongside a built-in VCC regulator and external OSCM frequency tuning via RC network. Motor current is set by VREF voltage (0–3.6 V) and sense resistor (RS), with gain of 1/5.0 (typ.), enabling precise 1.5 A (typ.) to 3.0 A (max) output per phase under defined operating conditions.

Key Specifications

Pinout & Package

Packaged in P-WQFN48-0707-0.50-003 (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad requiring direct soldering to PCB GND plane for thermal management. Pin 1 is top-left corner (marked); four corner pins and exposed pad must be connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN220TR and DRV8825PWPR, TB67S101AFTG provides superior thermal performance (3.0 A sustained), adaptive current decay (ADMD), and hardware-selectable step resolution - making it optimal for industrial motion systems demanding reliability, precision, and field-serviceable tuning.

Availability

TB67S101AFTG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump actuation, automated test equipment (ATE), and print head carriage control requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TB67S101AFTG 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 and power ICs for industrial, automotive, and computing applications, with emphasis on robustness, thermal efficiency, and functional safety.

TB67S101AFTG belongs to Toshiba's BiCD-based stepper motor driver product line, engineered specifically for high-current, high-voltage open-loop motion control in factory automation and precision instrumentation where thermal resilience and current fidelity are critical.

FAQ

What is the maximum continuous output current supported by the TB67S101AFTG?

The TB67S101AFTG supports up to 3.0 A continuous output current per phase under standard operating conditions (Ta = 25°C, VM = 24 V, proper PCB thermal design). This is derived from its 4.0 A absolute maximum rating, with thermal derating applied to maintain junction temperature below 120°C. The actual usable current depends on ambient temperature, copper area, and airflow - the datasheet specifies 1.5 A (typ.) to 3.0 A (max) in Table 9.1 Operation Ranges.

How does the Advanced Dynamic Mixed Decay (ADMD) function improve motor performance in the TB67S101AFTG?

The ADMD function in TB67S101AFTG dynamically selects between fast and slow decay modes within each PWM cycle based on real-time current error relative to the VREF-set target. This minimizes current ripple (typically <5%) while avoiding excessive power dissipation - unlike fixed-decay drivers. As a result, TB67S101AFTG achieves smoother torque delivery, reduced motor heating, and quieter operation, especially during microstepping transitions.

Can the TB67S101AFTG operate with a 5 V logic supply while driving a 48 V motor rail?

Yes, the TB67S101AFTG supports independent logic and motor supplies: VCC operates at 4.75–5.25 V (regulated internally), while VM accepts 10–47 V. This allows direct interfacing with 5 V microcontrollers while driving high-voltage stepper motors. However, logic inputs (PHASEA, INA1, etc.) must remain within VIN(H) = 2.0–5.5 V and VIN(L) = 0–0.8 V - no level shifting is required when using 5 V logic.

What thermal management practices are required for reliable operation of the TB67S101AFTG?

Reliable operation of TB67S101AFTG requires mounting the exposed thermal pad and all four corner pins directly to a large, low-thermal-resistance GND copper pour on a 4-layer PCB (JEDEC standard). All grounding traces must converge at a single point to avoid ground loops. Thermal shutdown triggers at 145–175 °C; to sustain 3.0 A output, board layout must achieve ≤30 °C/W junction-to-ambient resistance - verified via IR imaging or thermal simulation before production.

How is motor current set and calibrated in the TB67S101AFTG?

Motor current in TB67S101AFTG is set by the formula I_OUT = V_REF / 5.0 / R_S, where V_REF (0–3.6 V) is applied to VREFA/VREFB pins and R_S is the external current-sense resistor (e.g., 0.22 Ω). For example, 3.0 V on VREFA yields ~1.18 A with 0.51 Ω RS. Calibration is achieved by measuring actual coil current and adjusting VREF or RS value - the device guarantees ±5% current setting accuracy and ≤5% channel-to-channel mismatch.